JPS6049116B2 - pressure sensitive copying material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressure-infusion type pressure-sensitive copying material,
Similar to wax-type carphone paper, this type of copying material has a microporous structure made of thermoplastic resin as a support and contains non-volatile, non-drying oily substances and colorants such as pigments and dyes. As is well known.

Conventionally, in this type of leaching type configuration, a non-volatile, non-drying oily substance of the constituent material acts as a leaching liquid under pressure to form fine pores in the thermoplastic resin. It is difficult to form a uniform product, and when used, the copy often ends up with a blurred ring that is blurred with oil, making it difficult to obtain a product with stable quality performance.

In the present invention, a constituent material for uniformly forming microporous resin and a non-volatile, non-drying oily substance that leaches out under pressure are each arranged as independent constituent substances, and according to the technical idea, conventional techniques It has become possible to form extremely uniform microporous materials, and it has also become possible to obtain products with excellent copy clarity and stable quality performance during use.

As the thermoplastic resin used in the present invention, the vinyl resin is a polymer or copolymer of vinyl chloride, vinyl acetate, or vinylidene chloride, and a typical example thereof is a vinyl chloride-vinyl acetate copolymer.

Acrylic resins are polymers or copolymers of acrylic acid, methacrylic acid, acrylic esters, and methacrylic esters, and representative examples thereof include polymethyl methacrylate and polymethyl acrylate. Furthermore, these vinyl resins and acrylic resins may be mixed and used. It should be noted that a salt of a fatty acid and a polyethylene glycol long-chain alkylamine is included as a composition material for uniformly forming the microporous structure of the resin.

Polyethylene glycol long chain alkylamine is a substance that can be represented by the following formula. R-NH-(CH2=C
H2-0)nH /(CH2--CH2-O)xH (CH2-CHO---0)yH (CH2CH20)xH R-N-CH2CH2CH2N< 1(CH0CH00)yH (CH2CH20)zH In the formula, n, x, , y and z represent the degree of polymerization of the polyoxyethylene group, and R represents a long-chain alkyl group.

Generally, R has preferably 16 to 20 carbon atoms, and the degree of polymerization n
is 2-4, X. ,y. ．． z is preferably 1 to 2.

Further, as the fatty acid, higher fatty acids having 12 to 22 carbon atoms, such as oleic acid, ricinoleic acid, and linoleic acid, are used.

The fatty acid-polyethylene glycol long chain alkylamine salt is preferably liquid at room temperature.

Polyethylene glycol long-chain alkylamine alone provides a pressure-leaching type pressure-sensitive copying material due to its surfactant action, but by converting the amine into a salt with a fatty acid, the affinity between the resin and the leaching ink can be maintained at an appropriate level. The ability to uniformly form fine pores and the ability to disperse pigments are significantly improved, and a pressure-sensitive copying material with excellent copying density, durability, etc. is provided.

Examples of non-volatile and non-drying oily substances include mineral oils such as spindle oil and mobil oil, vegetable oils such as rapeseed oil and castor oil, and animal oils such as cow leg oil and spam oil.

The non-volatile, non-drying oily substance is compatible with the polyethylene glycol long-chain alkylamine and long-chain alkylamide, and the mixture thereof is liquid at room temperature, thereby achieving the desired quality performance of the copying material. There are things that can improve your. Further, as a coloring agent, ordinary pigments and dyes such as carbon black navy blue, ultramarine blue, alkali blue, and lakey red can be used.
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The pressure-sensitive copying material of the present invention can be produced by appropriately forming a transfer composition having the structure described above on a support such as paper or a sheet of plastic film by a conventional method and bringing the composition into close contact with the support.

The transfer composition is prepared by thoroughly kneading a colorant such as a pigment or dye, a non-volatile, non-drying oily substance, and the fatty acid-polyethylene glycol long-chain alkylamine salt using a kneading device such as a three-roll mill to form a paste.

On the other hand, after dissolving the resin in a volatile organic solvent using a suitable stirrer such as a ball mill to prepare a resin solution,
The previously prepared paste is added to the resin solution and dispersed using a ball mill or a suitable stirring device until a smooth and uniform consistency is obtained to prepare a coating material.

This coating material is uniformly applied onto the flexible substrate sheet using a coating machine equipped with a drying device, the volatile solvent is evaporated, and a transfer composition layer is formed to obtain a pressure-sensitive copying material.

The advantages of this pressure-sensitive copying material are as follows: Due to the action of the fatty acid-polyethylene glycol long-chain alkylamine salt, fine porosity in the resin is uniformly formed, and the dispersion of the colorant is promoted, resulting in the formation of fine pores. The movement of ink within the fine porous structure is facilitated, and when used, it is highly pressure sensitive, copies are clear, oil does not bleed or blur, and it is possible to obtain a quality with excellent durability. Examples of the present invention are listed below: Example 1 Vinyl chloride-vinyl acetate copolymer 15 parts by weight Polyethylene glycol long-chain alkylamine salt (salt with oleic acid) 10 Castor oil
14〃b carbon black
10〃Toluene
25 Ethyl acetate
75. Mix carbon black, polyethylene glycol long-chain alkylamine salt, and castor oil and thoroughly knead with a three-roll mill to make a paste. Meanwhile, put vinyl chloride-vinyl acetate copolymer, toluene, and acetic acid ester into a ball mill. The mixture was stirred at 50° C. for 1 hour to completely dissolve the vinyl chloride-vinyl acetate copolymer.

Next, the previously prepared paste is added to this resin solution and stirred for 2 hours using a stirrer to disperse it to a smooth and uniform consistency to prepare a coating material.

This coating material is applied onto carbon base paper using a coating machine equipped with a drying device, and toluene and acetate are evaporated to form a transfer composition layer, thereby producing a pressure-sensitive copying material. Example 2 Vinyl chloride-vinyl acetate copolymer 15 parts by weight Polyethylene glycol long chain alkyl diamine salt (salt with ricinoleic acid) 5 Mineral oil 1
9.0 Carbon black 1
0〃Toluene 30〃
Methyl ethyl ketone 70 Example 3 Vinyl chloride-vinyl acetate copolymer 9 parts by weight Polymethacrylic acid methyl ester 4 Polyethylene glycol long-chain alkylamine salt (ricinoleic acid salt)
15〃Castor oil
9〃Carbon black
7〃Alkali Blue 5
〃Toluene 25〃Ethyl acetate 75〃Example 4
Vinyl chloride-vinyl acetate copolymer 8 parts by weight Polymethacrylic acid methyl ester 5 Polyethylene glycol long chain alkylamine salt (salt with ricinoleic acid)
15〃Mineral oil 13〃Navy blue
Blue 8 parts by weight toluene
25 Ethyl acetate
40〃Methyl ethyl ketone
35 Comparative Example Vinyl chloride-vinyl acetate copolymer 15 parts by weight Polyethylene glycol alkylamine 10 Castor oil
14 Power point black
10〃Toluene 2
5. Ethyl acetate 75. A pressure-sensitive copying material was prepared using the above materials and following the method of Example 1.

The coating amount was 10yI. Example 5 In the above comparative example, the polyethylene glycol long chain alkylamine was changed to ricinoleic acid monopolyethylene glycol long chain alkylamine salt, and the other operations were the same.

Note) Regarding concentration and durability, the following tests were conducted.

Test method: A set of copy paper and 8wnx150TI$l carbon paper is passed between metal rolls with a load of 300 kg nod to create a copy sample.

Using the same carbon paper, the ink leaching amount (numbers without parentheses in the table below) was measured every time up to 10 times, and the copy density (numbers in parentheses) was measured using a Macbeth densitometer. As shown in the above results, the sol carbon paper of Example 5 leached out more ink than that of the comparative example, and was also superior in copy density.

Claims (1)

[Claims] 1. In a pressure-sensitive copying material in which a transfer composition fixed on a support is a pressure leaching ink layer, the transfer composition is uniformly dispersed in a vinyl resin, an acrylic resin, or a mixture of these resins and the resin is dispersed by applying pressure. consisting of a non-volatile, non-drying oily substance insoluble in the resin to be leached, as well as a coloring agent and, in particular, a salt of a fatty acid and a polyethylene glycol long-chain alkylamine insoluble in the resin to form the microporosity of the resin; A pressure-sensitive copying material characterized by: