JP3290811B2 - Release paper for synthetic leather production - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a release paper for producing synthetic leather, and more particularly to a release paper having excellent heat resistance and wettability, which is used in a process of producing synthetic leather using a water-soluble or water-dispersible resin. To a release paper that is suitable for

[0002]

2. Description of the Related Art A 4-methyl-1-pentene polymer is
Since the melting point is from 220 to 240 ° C., the heat resistance is high and the releasability is excellent. Therefore, in a release paper for producing synthetic leather or a release film for producing a flexible printed circuit board, a base material such as paper and film is used. It is widely used as a main component of a release layer formed on a material.

[0003] Recently, in the field of synthetic leather production, attention has been paid to environmental issues and resource saving, and water-soluble or water-dispersible resins have been receiving attention as raw materials for synthetic leather. The release layer of release paper used in the production of synthetic leather using such a water-soluble or water-dispersible resin as a raw material resin has high heat resistance and water-soluble or water-dispersible properties for improving productivity. Appropriate wettability to resin is required.

[0004]

However, a release paper using a conventional 4-methyl-1-pentene polymer as a release agent (Japanese Patent Application Laid-Open No. 2-307985) is not suitable for the above-mentioned applications. While exhibiting sufficient heat resistance, poor wettability occurs due to low wettability with a water-soluble or water-dispersible resin. Therefore, it is difficult to produce high-quality synthetic leather with a release paper having a release layer made of a conventional 4-methyl-1-pentene polymer. On the other hand, release paper having a release layer made of polypropylene has some wettability but lacks heat resistance.

[0005] Since release paper for producing synthetic leather is generally used many times, it is essential that the adhesive strength between the release layer and the paper substrate be high. Therefore, it is suitable for the production of synthetic leather using a water-soluble or water-dispersible resin that satisfies both the properties of heat resistance and wettability, and has high adhesive strength between the release layer and the paper substrate. Release paper was strongly sought.

Accordingly, a first object of the present invention is to provide a release paper having heat resistance and appropriate wettability and suitable for producing synthetic leather using a water-soluble or water-dispersible resin. is there.

A second object of the present invention is to provide a release paper for producing synthetic leather, which has high adhesive strength between resin and paper so that it can be used repeatedly.

[0008]

In order to solve the above-mentioned problems, the present invention provides (A) 100 parts by weight of a 4-methyl-1-pentene polymer (A-1) and the following formula (a):

[0009]

Embedded image

Wherein R ¹ , R ² , R ³ and R ⁴ are
May be the same or different, a hydrogen atom or the following formula (a-1): represented by (wherein, n is 8-20 _{integer) C n H 2n + 1 CO-} (a-1) Wherein R ¹ , R ² , R ³ and R ⁴ are not hydrogen atoms at the same time.]
(B) 4-methyl-1-pentene-based polymer composition containing 0.1 to 5 parts by weight of
It is laminated on a (C) paper base via an intermediate resin layer composed of 1-pentene polymer (B-1), and (A) the release layer has a thickness similar to that of (B) the intermediate resin layer. The present invention provides a release paper for producing synthetic leather, which is the same or a thin layer.

Hereinafter, the release paper for producing synthetic leather of the present invention (hereinafter referred to as “release paper of the present invention”) will be described in detail.

The release paper of the present invention has (C) a paper base and (C) a release layer laminated on the (C) paper base via an intermediate resin layer. Things. The (A) release layer and the (B) intermediate resin layer may be laminated on one side of the (C) paper base or on both sides.

In the present invention, (C) the paper base includes:
Kraft paper, high quality paper, imitation paper, art paper, coated paper and the like can be used. The basis weight of the paper base (C) is usually about 80 to 200 g / m ² .

Further, (A) the release layer comprises 4-methyl-1
4-methyl-containing a pentene polymer (A-1) and an ester compound (A-2) represented by the formula (a).
It is composed of a 1-pentene polymer composition. The thickness of the release layer (A) is usually about 1 to 50 μm, and is 5 to 20 μm in view of ease of molding and production cost.
Is preferable.

The 4-methyl-1-pentene polymer which is the component (A-1) of the 4-methyl-1-pentene polymer composition forming the release layer is 4-methyl-1-pentene polymer. Or a copolymer of 4-methyl-1-pentene and another α-olefin. Examples of other α-olefins include ethylene, propylene, 1-butene, 1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, and 1-eicosene. Α- having 2 to 20 carbon atoms
Olefins. Among these, a random copolymer of 4-methyl-1-pentene and at least one α-olefin selected from 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, and 1-octadecene is preferable. . Also, this 4-methyl-1-
The pentene-based polymer has an appropriate melting point and good heat resistance, so that 4-methyl-1-pentene is 80% by weight.
Polymers containing the above are preferred.

The 4-methyl-1-pentene-based polymer has a spreadability of the 4-methyl-1-pentene-based polymer composition within an appropriate range, and has an appropriate viscosity. Lamination molding can be performed at high speed with no troubles such as lowering productivity, uniform thickness, no cracking of release layer, and excellent release strength of adhesive strength between resin layer and paper. Melt flow rate (MFR) is 1-40
It is preferably within a range of 0 g / 10 minutes, and especially 1 g / 10 min.
What is 0 to 300 g / 10 minutes is preferable. In the present invention, the melt flow rate (MFR) is defined as ASTM.
Load according to D1238: 5.0 kg, temperature: 260 ° C
Is a value measured under the condition of

The ester compound which is the component (A-2) of the 4-methyl-1-pentene polymer composition is a compound represented by the general formula (a). In the general formula (a), R ¹ , R ² , R ³ and R ⁴ may be the same or different, and may be a hydrogen atom or a compound represented by the following formula (a-
1): a group represented by C _n H _{2n + 1} CO- (a-1) (where n is an integer of 8 to 20), provided that R ¹ , R ² , R ³ and R ⁴ is not simultaneously a hydrogen atom.

Specific examples of the ester compound (A-2) represented by the general formula (a) include pentaerythritol monostearate, pentaerythritol distearate, pentaerythritol tristearate, pentaerythritol tetrastearate, Pentaerythritol monopalmitinate, pentaerythritol dipalmitinate, pentaerythritol tripalmitinate,
Examples include pentaerythritol tetrapalmitinate, pentaerythritol monolaurate, pentaerythritol dilaurate, pentaerythritol trilaurate, and pentaerythritol tetralaurate. These may be used alone or as a mixture of two or more. Among these, particularly, a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component is preferable,
What is marketed by Nippon Yushi Co., Ltd. as a brand name: UNISTAR H-476D is mentioned.

The 4-methyl-1-pentene polymer (A) in the 4-methyl-1-pentene polymer composition
Since the compounding ratio of -1) and the ester compound (A-2) has appropriate wettability, poor wettability does not occur even when a water-soluble or water-dispersible resin is applied in the production of synthetic leather. In addition, since a release paper having a high adhesive strength between the paper and the resin layer and a reusable paper can be obtained, the ester-based compound (A) -2) 0.1 to 5 parts by weight, preferably 0.1 to 2 parts by weight.

4-Methyl-1- constituting the upper layer of the present invention
The amount of such an ester compound contained in the pentene polymer composition is a total of 10% of the 4-methyl-1-pentene polymer (A) and the high-pressure low-density polyethylene (B).
The range of 0.1 to 5 parts by weight is preferable, and the range of 0.1 to 2 parts by weight is particularly preferable, based on 0 parts by weight.

In the release paper of the present invention, (A) the 4-methyl-1-pentene polymer composition constituting the release layer contains high-pressure low-density polyethylene (A-3). This is preferable in that neck-in and ear sway during lamination molding are reduced and productivity is improved. This high pressure method low density polyethylene (A-3) has a density of 0.
It has a melting point in the range of 910 to 0.930 g / cm ³ and a melting point in the range of 100 to 110 ° C. measured by the DSC method.

The high-pressure low-density polyethylene (A
-3) is a load: 2.1 according to ASTM D1238.
The melt flow rate (MFR) measured under the conditions of 6 kg and a temperature of 190 ° C. is preferably in the range of 0.1 to 100 g / 10 min, more preferably 1 to 50 g.
/ 10 min is preferable.

As a specific example of this high-pressure low-density polyethylene, a trade name: Mirason 10 from Mitsui Petrochemical Co., Ltd.
P, Mirason 10L, Mirason 11P, Mirason 14
P, Mirason 16P, Mirason 252, and the like, or equivalents that are marketed by other manufacturers and the like. Of these, Mirason 10P and Mirason 11P are particularly preferred.

When the 4-methyl-1-pentene polymer composition contains a high-pressure low-density polyethylene (A-3),
The compounding ratio is excellent in heat resistance and release properties, and a release paper that can be used repeatedly can be obtained, so that 80 to 97 parts by weight of the 4-methyl-1-pentene polymer (A-1) is used.
The ratio is preferably from 3 to 20 parts by weight of high-pressure low-density polyethylene (A-3).

Further, in the release paper of the present invention, (A)
The 4-methyl-1-pentene polymer composition constituting the release layer is an ethylene / ethyl acrylate copolymer (A
It is preferable that the composition contains -4) because the wettability is improved. This ethylene / ethyl acrylate copolymer (A-4) is a copolymer of ethylene and ethyl acrylate, provides a releasable layer having excellent wettability, and has a suitable melt tension during molding. In view of obtaining a 4-methyl-1-pentene polymer composition having no problem of lowering productivity such as increase in neck-in, those having an ethyl acrylate content of 10 to 40% by weight are preferable, Particularly preferred is 15 to 30% by weight.

The ethylene / ethyl acrylate copolymer (A-4) preferably has an MFR of from 1 to 50 g / 10 minutes, particularly preferably from 3 to 30 g / 10 minutes.

The 4-methyl-1-pentene polymer composition is an ethylene / ethyl acrylate copolymer (A-4)
When the ethylene-ethyl acrylate copolymer (A-4) is contained, the amount of the ethylene-ethyl acrylate copolymer (A-4) is preferably 4-methyl-1-pentene-based polymer in that a release paper having excellent wettability, heat resistance and release properties is obtained. (A-1) Ethylene ethyl acrylate copolymer (A-4) 20 to 3 with respect to 80 to 97 parts by weight.
A ratio of 5 parts by weight is preferable, and a ratio of 5 to 15 parts by weight is particularly preferable.

The intermediate resin layer (B) of the release paper of the present invention comprises a 4-methyl-1-pentene polymer (B-1). The 4-methyl-1-pentene-based polymer (B-1) is a component of the (A) 4-methyl-1-pentene-based polymer composition forming the release layer, and is a 4-methyl-1-pentene-based polymer. -As in the case of the pentene polymer (A-1), 4-
It is a homopolymer of methyl-1-pentene or a copolymer of 4-methyl-1-pentene and another α-olefin, the content of 4-methyl-1-pentene, the melt flow rate (MFR), etc. May be in the same range or different.

Further, (B) the intermediate resin layer, when the 4-methyl-1-pentene-based polymer (B-1) further contains a high-pressure low-density polyethylene (B-2), is neck-in. This is preferable because ear sway is small and productivity is improved. This high pressure method low density polyethylene (B-
2) is (A) 4-methyl-1 forming the release layer
-The same as the high-pressure low-density polyethylene (A-3) blended in the pentene polymer composition,
Melting point and melt flow rate (MF
R) may be the same or different.

When the intermediate resin layer (B) of the present invention contains a high-pressure method low-density polyethylene (B-2), its compounding amount is 4
-Methyl-1-pentene polymer (B-1) 80 to 97
High-pressure low-density polyethylene (B-2)
The amount is 3 to 20 parts by weight, preferably 5 to 20 parts by weight.
It is an amount which becomes 15 parts by weight.

In the present invention, (A) a 4-methyl-1-pentene polymer composition constituting a release layer,
-Methyl-1-pentene polymer (A-1), ester compound (A-2), high-pressure low-density polyethylene (A-
3), ethylene / ethyl acrylate copolymer (A-
In addition to 4), (B) the intermediate resin layer is 4-methyl-
In addition to the 1-pentene polymer (B-1) and the high-pressure low-density polyethylene (B-2), various compounding agents to be added to the polyolefin and the like may be added as necessary. For example, silane coupling agent, weather stabilizer, heat stabilizer,
Various compounding agents, such as slip agents, nucleating agents, pigments, dyes, and the like, which are usually used in addition to polyolefins, may be compounded within a range that does not impair the object of the present invention.

In the release paper of the present invention, (A) the thickness of the intermediate resin layer is such that the release layer has a high adhesive strength between the resin and the paper and a release paper that can be used repeatedly is obtained. Preferably, it is the same or thinner.

The release paper of the present invention is produced by using 4-methyl-1
A pentene polymer (A-1) and an ester compound (A-2), and preferably a high-pressure low-density polyethylene (A-3) or an ethylene / ethyl acrylate copolymer (A-4), and optionally Accordingly, the various compounding agents to be compounded are mixed at a predetermined compounding ratio by a mixer or a known method to prepare a resin mixture for a release layer. next,
For the intermediate resin layer containing the obtained mixture for the release layer and the 4-methyl-1-pentene polymer (B-1) and preferably the high-pressure low-density polyethylene (B-2) at a predetermined mixing ratio. The mixture can be supplied to different kneaders, melt-kneaded, co-extruded, and lamination-molded on a paper substrate. Examples of the mixer used include a V blender, a ribbon blender, a Henschel mixer, and a tumbler blender. Examples of the kneader include a single screw extruder, a double screw extruder, a kneader, and a Banbury mixer. In lamination molding, the melt-kneaded product for the release layer, which has been melted with the paper base, and the melt-kneaded product for the intermediate resin layer are co-extruded with a multilayer laminator, and the mold release properties are formed on the paper base via the intermediate resin layer. It can be performed according to the method of forming the layer.

[0034]

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples and comparative examples of the present invention, but the present invention is not limited to these examples unless it exceeds the gist thereof.

The release paper obtained in the examples was evaluated or measured for wettability, adhesive strength, repetitive use, and contact angle according to the following methods.

Evaluation of Characteristics of Release Paper Wettability An aqueous dispersion of an aliphatic polyester polyurethane (manufactured by Bayer) was dropped onto the surface of the release paper along a wire bar (# 16), and the solvent was dried to form a coating film. When the coating was applied to a thickness of 10 μm, the following criteria were used to evaluate whether or not poor wetting occurred. ○: No wetting failure ×: There is poor wetting Adhesive strength between the intermediate resin layer and the paper substrate A strip-shaped test piece with a width of 15 mm was prepared from the release paper, and a 180 ° square test piece was prepared using a tensile tester. A peel test was performed at a test speed of 300 mm / min to measure the adhesive strength between the release layer and the paper substrate. Repeatability The above-mentioned wettability test is repeated for the same release paper, and the number of repetitions until a wetting failure portion occurs is calculated as follows:
It was used as an index for repeated use. Contact angle The contact angle of the release paper with water was measured using a contact angle measuring device (Kyowa Interface Science Co., Ltd., CA-S Micro II type).
Measured in ° C.

(Example 1) <Preparation of 4-methyl-1-pentene polymer composition>
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
Min.), 90 parts by weight of pellets, high-pressure low-density polyethylene (manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason 11)
P, MFR: 7.2 g / 10 min) 10 parts by weight, and a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component (Nippon Oil & Fats Co., Ltd., trade name: Unistar H-476D) 0 parts by weight was supplied to a Henschel mixer and mixed at high speed for 1 minute. The obtained mixture was supplied to a twin-screw extruder and melt-kneaded at 260 ° C. to prepare a 4-methyl-1-pentene polymer composition.

<Co-extrusion lamination molding>
Methyl-1-pentene polymer composition, and 4-methyl-
Using a 1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10 min), a coextrusion molding method was carried out according to the following molding conditions.
-Methyl-1-pentene polymer composition having a thickness of 1
A release paper having two layers, a 0 μm release layer and a 20 μm-thick intermediate resin layer made of a 4-methyl-1-pentene polymer, on a paper substrate was produced. Release paper molding conditions Cylinder temperature C1 / C2 / C3 / C4 / die 300/350/320/320/ 320 ℃ die width 800mm paper substrate Hokuetsu Paper Mills Co., basis weight 125 g / m ² the release layer Thickness: 10 μm Thickness of the intermediate resin layer: 20 μm Molding speed: 50 m / min The wettability of the obtained release paper, the adhesive strength between the intermediate resin layer and the paper base, the repetitive usability, and the contact angle were evaluated or measured. Table 1 shows the results.

(Example 2) <Preparation of 4-methyl-1-pentene polymer composition>
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
Min.), 90 parts by weight of pellets, high-pressure low-density polyethylene (manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason 11)
P, MFR: 7.2 g / 10 min) 10 parts by weight and a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component (Nippon Oil & Fats Co., Ltd., trade name: Unistar H-476D) 0 parts by weight was supplied to a Henschel mixer and mixed at high speed for 1 minute. The obtained mixture was supplied to a twin-screw extruder and melt-kneaded at 260 ° C. to prepare a 4-methyl-1-pentene polymer composition.

The above 4-methyl-1-pentene polymer composition and a 4-methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 18
0 g / 10 min) in the same manner as in Example 1,
Thickness 10 of methyl-1-pentene polymer composition
A release paper having two layers on a paper substrate, that is, a release layer having a thickness of μm and an intermediate resin layer having a thickness of 20 μm comprising a 4-methyl-1-pentene polymer was produced. Wettability of the obtained release paper,
The adhesive strength between the intermediate resin layer and the paper substrate, the reusability, and the contact angle were evaluated or measured. Table 1 shows the results.

Example 3 <Preparation of 4-methyl-1-pentene polymer composition> 4
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
), And a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component (Nippon Oil & Fats Co., Ltd., trade name:
Unistar H-476D) was supplied to a Henschel mixer at a ratio of 1.0 part by weight and mixed at high speed for 1 minute. The obtained mixture was melt-kneaded at 260 ° C. using a twin-screw extruder to prepare a 4-methyl-1-pentene polymer composition.

<Preparation of Composition Constituting Intermediate Resin Layer>
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
Min.) And 90 parts by weight of high-pressure low-density polyethylene (manufactured by Mitsui Petrochemical Industries, Ltd., trade name: Mirason 11)
P, MFR: 7.2 g / 10 min) 10 parts by weight,
The mixture was fed to a Henschel mixer and mixed at high speed for 1 minute. The obtained mixture was melt-kneaded at 260 ° C. using a twin-screw extruder to prepare a composition constituting an intermediate resin layer.

Using the above-mentioned 4-methyl-1-pentene polymer composition and the above composition, in the same manner as in Example 1, the thickness of the 4-methyl-1-pentene polymer composition A release layer having a thickness of 10 μm and a thickness 2 comprising the above composition
A release paper having two layers of a 0 μm intermediate resin layer on a paper substrate was manufactured. The wettability of the obtained release paper, the adhesive strength between the intermediate resin layer and the paper substrate, the repetitive usability and the contact angle were evaluated or measured. Table 1 shows the results.

Comparative Example 1 4-Methyl-1-pentene
30-μm-thick 4-methyl-1-pentene-1-decene copolymer using only pellets of 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10 min) A single-layer release paper made of was formed and its characteristics were evaluated. Table 1 shows the results.

(Comparative Example 2) The thickness of the release layer was 20 μm,
A two-layer release paper was formed in the same manner as in Example 1 except that the thickness of the intermediate resin layer was changed to 10 μm, and the characteristics were evaluated. Table 1 shows the results.

[0046]

(Example 4) <Preparation of 4-methyl-1-pentene polymer composition>
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
90 parts by weight of a pellet), an ethylene / ethyl acrylate copolymer (manufactured by Mitsui / Dupont Polychemical Co., Ltd.)
Evaflex-EEA-A702, EA content: 19
Weight%, MFR: 5 g / 10 min) 10 parts by weight, and a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component (NOF Corporation, trade name: Unistar H-476D) 1.0 The mixture was fed to a Henschel mixer at a ratio of parts by weight and mixed at high speed for 1 minute. The resulting mixture was mixed using a twin screw extruder at 260
The mixture was melt-kneaded at a temperature of 4.degree. C. to prepare a 4-methyl-1-pentene polymer composition.

The above 4-methyl-1-pentene polymer composition and 4-methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 18
0 g / 10 min) in the same manner as in Example 1,
Thickness 10 of methyl-1-pentene polymer composition
A release paper having two layers on a paper substrate, that is, a release layer having a thickness of μm and an intermediate resin layer having a thickness of 20 μm comprising a 4-methyl-1-pentene polymer was produced. Wettability of the obtained release paper,
The adhesive strength between the intermediate resin layer and the paper substrate, the reusability, and the contact angle were evaluated or measured. Table 2 shows the results.

(Example 5) <Preparation of 4-methyl-1-pentene polymer composition>
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
90 parts by weight of a pellet), an ethylene / ethyl acrylate copolymer (manufactured by Mitsui / Dupont Polychemical Co., Ltd.)
Evaflex-EEA-A703, EA content: 25
Weight%, MFR: 5 g / 10 min) 10 parts by weight, and a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component (NOF Corporation, trade name: Unistar H-476D) 1.0 The mixture was fed to a Henschel mixer at a ratio of parts by weight and mixed at high speed for 1 minute. The resulting mixture was mixed using a twin screw extruder at 260
The mixture was melt-kneaded at a temperature of 4.degree. C. to prepare a 4-methyl-1-pentene polymer composition.

The above 4-methyl-1-pentene polymer composition and a 4-methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 18
0 g / 10 min) in the same manner as in Example 1,
Thickness 10 of methyl-1-pentene polymer composition
A release paper having two layers on a paper substrate, that is, a release layer having a thickness of μm and an intermediate resin layer having a thickness of 20 μm comprising a 4-methyl-1-pentene polymer was produced. Wettability of the obtained release paper,
The adhesive strength between the intermediate resin layer and the paper substrate, the reusability, and the contact angle were evaluated or measured. Table 2 shows the results.

(Example 6) <Preparation of 4-methyl-1-pentene polymer composition>
-Methyl-1-pentene / 1-decene copolymer (1-decene content: 2.2% by weight, MFR: 180 g / 10
90 parts by weight of pellets of the following formula (Evaflex-EEA-A702, E, manufactured by DuPont-Mitsui Polychemicals Co., Ltd.)
A content: 19% by weight, MFR: 5 g / 10 minutes) 10 parts by weight, and a mixture of pentaerythritol stearate containing pentaerythritol distearate as a main component (Nippon Oil & Fats Co., Ltd., trade name: Unistar H-) 476
D) The mixture was fed to a Henschel mixer at a ratio of 0.5 parts by weight and mixed at high speed for 1 minute. The obtained mixture was melt-kneaded at 260 ° C. using a twin-screw extruder to prepare a 4-methyl-1-pentene polymer composition.

The above 4-methyl-1-pentene polymer composition and a 4-methyl-1-pentene-1-decene copolymer (1-decene content: 2.2% by weight, MFR: 18
0 g / 10 min) in the same manner as in Example 1,
Thickness 10 of methyl-1-pentene polymer composition
A release paper having two layers on a paper substrate, that is, a release layer having a thickness of μm and an intermediate resin layer having a thickness of 20 μm comprising a 4-methyl-1-pentene polymer was produced. Wettability of the obtained release paper,
The adhesive strength between the intermediate resin layer and the paper substrate, the reusability, and the contact angle were evaluated or measured. Table 2 shows the results.

[0053]

[0054]

Since the release paper of the present invention has heat resistance and moderate wettability, it can be suitably used as a release paper for producing synthetic leather using a water-soluble or water-dispersible resin.

Further, since the release paper of the present invention has a high adhesive strength between the resin layer and the paper base even at a high temperature, it can be used repeatedly when producing synthetic leather using a water-soluble or water-dispersible resin. Therefore, manufacturing costs can be reduced.

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Keisuke Arita 1-1-1, Ichigaya Kagacho, Shinjuku-ku, Tokyo Inside Dai Nippon Printing Co., Ltd. (72) Inventor Junichi Hashikawa Ichigaya Kaga, Shinjuku-ku, Tokyo 1-1-1, Machi, Dai Nippon Printing Co., Ltd. (72) Inventor Susumu Ushi 1-1-1, Ichigaya, Kagamachi, Shinjuku-ku, Tokyo Dai-Nippon Printing Co., Ltd. (56) References JP-A-4- 361670 (JP, A) JP-A-2-307985 (JP, A) JP-A-2-265745 (JP, A) JP-A-4-101841 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B32B 1/00-35/00 D06N 3/00-3/18 D21H 27/00-27/42

Claims (8)

(57) [Claims] (1) 100 parts by weight of (A) a 4-methyl-1-pentene polymer (A-1) and the following formula (a): [Wherein, R ¹ , R ² , R ³ and R ⁴ may be the same or different, and represent a hydrogen atom or the following formula (a-1): C _n H _{2n + 1} CO- (a-1) ( Wherein n is an integer of 8 to 20), provided that R ¹ , R ² , R ³ and R ⁴ are not hydrogen atoms at the same time. -2)
A release layer comprising a 4-methyl-1-pentene polymer composition containing 0.1 to 5 parts by weight of (B) a 4-methyl-1-pentene polymer (B-1); (C) laminated on a paper substrate via an intermediate resin layer, (A) the release layer has the same thickness as (B) the intermediate resin layer,
Or a release paper for the production of synthetic leather, which is a thin layer. 2. The 4-methyl-1-pentene polymer (A-1) or (B-1) has a 4-methyl-1-pentene content of 80% by weight or more. A release paper for producing synthetic leather according to claim 1. 3. The 4-methyl-1-pentene polymers (A-1) and (B-1) are 4-methyl-1-pentene and 1-decene, 1-dodecene, 1-tetradecene, The release paper for producing synthetic leather according to claim 1, which is a random copolymer with at least one kind of α-olefin selected from 1-hexadecene and 1-octadecene. 4. The 4-methyl-1-pentene polymer composition further comprises a 4-methyl-1-pentene polymer (A
-1) The release paper for producing synthetic leather according to claim 1, wherein the release paper contains 3 to 20 parts by weight of a high-pressure method low-density polyethylene (A-3) based on 80 to 97 parts by weight. 5. The high-pressure low-density polyethylene (B-2) 3 based on the intermediate resin layer (B) is further added to 80 to 97 parts by weight of the 4-methyl-1-pentene polymer (B-1). ~ 2
The release paper for producing synthetic leather according to claim 1 or 4, comprising 0 parts by weight. 6. The high-pressure low-density polyethylene (A-3).
Or (B-2) has a density of 0.910 to 0.930 g.
/ Cm ³ range and release paper for synthetic leather production according to claim 4 or 5 having a melting point of the range of 100 to 110 ° C.. 7. The 4-methyl-1-pentene polymer composition further comprises a 4-methyl-1-pentene polymer (A
2. The release paper for producing synthetic leather according to claim 1, wherein the release paper contains 20 to 3 parts by weight of the ethylene / ethyl acrylate copolymer (A-4) based on 80 to 97 parts by weight. 8. The ethylene / ethyl acrylate copolymer (A-4) has an ethyl acrylate content of 10 to 10.
The release paper according to claim 7, which is 40% by weight.