JP4642192B2 - PET-G resin composition - Google Patents

Description

【００２８】
【発明の効果】
本発明によるジアセチルモノアシルグリセロールを可塑剤としてＰＥＴ−Ｇ樹脂に含有せしめることにより、透明性を損なうことなく、柔軟性及びブリード抑制性の優れた樹脂加工製品が得られ、食品包装等への応用の幅が広げられる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a PET-G resin composition obtained by modifying polyethylene terephthalate (abbreviated herein as PET).
[0002]
[Prior art]
(Herein referred to as PET-G) glycol-modified PET is a non-crystalline copolyester part is substituted modified with cyclohexanedimethanol PET ethylene glycol component that hardness and transparency are good Due to these properties, the use is expanding as containers and packaging materials for foods and medicines, electronic devices, office supplies and other cases, molded container lids, ID card sheets, and the like.
[0003]
However, since the product of PET- G resin is hard, its use has been restricted to fields requiring flexibility, particularly films and packaging materials.
[0004]
In order to improve the hardness and impart softness, the addition of a plasticizer is one method, but in order to act as a plasticizer, it is necessary to have the following requirements.
(1) Excellent compatibility with the polymer or resin to be plasticized (2) Good plasticization efficiency (3) Little deterioration in performance due to volatilization, migration or exudation after processing Polyethylene or There are no plasticizers such as phthalate used in many resins such as polyvinyl chloride that sufficiently satisfy the conditions such as plasticity, transparency and bleed suppression.
[0005]
[Problems to be solved by the invention]
This invention makes it a subject to develop the plasticizer excellent in the softness | flexibility and bleeding suppression property, without inhibiting the transparency of PET- G product.
[0006]
[Means for Solving the Problems]
As a result of intensive studies to solve the above problems, the present inventor has found that diacetyl monoacylglycerol having 8 to 14 carbon atoms in the fatty acid constituting the ester has less bleeding and exhibits excellent plasticity. The present invention has been completed.
[0007]
That is, this invention has the structure described below.
1, polyethylene terephthalate (PET) part cyclohexanedimethanol substituted with PET-G trees Oite the fat is amorphous copolyesters denatured ethylene glycol component, PET-G resin per 100 parts by weight, PET- containing 10 to 50 parts by mass of diacetyl monoacylglycerol which is one or a mixture of two or more selected from fatty acids having 8 to 14 carbon atoms in the fatty acid constituting the ester G resin composition.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Details of the present invention will be described below.
The resin targeted by the present invention is PET- G (amorphous copolyester obtained by substituting a part of the ethylene glycol component of PET with cyclohexanedimethanol for modification).
[0010]
The plasticizer used in the present invention is diacetyl monoacylglycerol, and the fatty acid constituting the ester is one of aliphatic linear monocarboxylic acids having 8 to 14 carbon atoms of caprylic acid, caproic acid, lauric acid or myristic acid. Or it is a mixture of two or more. Fatty acids having a carbon number of less than 8 are impractical due to their small circulation and fatty acids having a fatty acid having a carbon number of more than 14 or an ester composed of an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid. In that case, the bleed suppression is inferior, which is not preferable.
[0011]
Diacetyl monoacylglycerol was obtained by synthesizing fatty acid triglyceride by esterification reaction of glycerol and fatty acid or esterification reaction of glycerol, fatty acid and lower alkyl alcohol ester, and by performing esterification reaction of the triglyceride and triacetin. A reaction product containing monoacylglycerol as a main component is obtained by dividing diacetyl monoacylglycerol by molecular distillation of the mixture, or by esterification reaction of glycerol and fatty acid or esterification reaction of glycerol, fatty acid and lower alkyl alcohol. The reaction product is obtained by, for example, a method of separating and concentrating monoacylglycerol from the reaction product by molecular distillation or chromatography, and acetylating the obtained monoacylglycerol with acetic anhydride. I am not particularly limited in the method.
[0012]
The amount for the PET -G resin plasticizer according to the invention shall be the 10 to 50 parts by weight to 100 parts by weight resin. When the amount is less than that, the plasticizing effect is not sufficiently exhibited, and when the amount is more than that, the plasticizer exudes to the surface during storage of the resin product, which is not preferable.
[0013]
In the present invention, in addition to diacetyl monoacylglycerol, it is generally used as a plasticizer for resins such as phthalic acid esters, adipic acid esters, and triacetin as long as the physical properties and functions of the resin are not impaired. Components, stabilizers, lubricants, antioxidants, slip agents, antifogging agents, and the like may be added.
[0014]
The PET- G resin composition in the present invention can be extruded, injected, or thermoformed using an extruder, an injection molding machine or the like used for ordinary plastic molding. In addition, calendering is possible by adding an appropriate lubricant.
[0015]
【Example】
EXAMPLES Hereinafter, although this invention is demonstrated with an Example, this invention is not limited to these Examples.
[0016]
<Test sample>
1. [Test sample-1] Esterification of 1 mol of glycerol diacetomonocaprylate glycerin and 1 mol of caprylic acid by a known method, followed by molecular distillation to obtain glycerin monocaprylate having a purity of about 90% by mass It was. The glycerin monocaprylate equivalent to 1 mol was reacted with 2.1 mol of acetic anhydride in an amount corresponding to acetylation, and then acetic acid was removed by distillation under reduced pressure to obtain a test glycerin diacetomonocaprylate.
[0017]
2. [Test sample-2] Esterification of 1 mol of glycerin diacetomonocaprate glycerin and 1 mol of capric acid was performed by a known method, and glycerin monocaprate having a purity of about 90% by mass was obtained by molecular distillation. . This glycerin monocaprate equivalent to 1 mol of 2.1 mol of acetic anhydride was reacted to acetylate, and then acetic acid was removed by distillation under reduced pressure to obtain a test glycerin diacetate monocaprate.
[0018]
3. [Test Sample-3] Glycerin diacetomonolaurate 1 mol equivalent of glycerol and 1 mol equivalent of lauric acid were esterified by a known method, and then glycerol monolaurate having a purity of about 92% by mass was obtained by molecular distillation. . This glycerin monolaurate equivalent to 1 mol of acetic anhydride was reacted with 2.1 mol of acetic anhydride to acetylate, and then acetic acid was removed by distillation under reduced pressure to obtain glycerol diacetomonolaurate for testing.
[0019]
4). [Test sample-4] Esterification of 1 mol of glycerin diacetomonomyristate glycerin and 1 mol of myristic acid was performed by a known method, and glycerin monomyristate having a purity of about 95% by mass was obtained by molecular distillation. . The glycerin monomyristate equivalent to 1 mol was reacted with 2.1 mol of acetic anhydride in an amount corresponding to acetylation, and then acetic acid was removed by distillation under reduced pressure to obtain a test glycerin diacetomonomyristate.
[0020]
5. [Test sample-5] A commercially available product of di (2-ethylhexyl) phthalate was used.
[0021]
6). [Test sample-6] A commercial product of dibutyl phthalate was used.
[0022]
<Test and evaluation>
A predetermined amount (described in Table 1) of the above test sample is blended for each of Examples and Comparative Examples with respect to 100 parts by mass of PET-G resin [EASTMAN PET-G 6863 manufactured by EASTMAN CHEMICAL] (for example, implementation) Example 1 shows that 30 parts by mass of the test sample-1 was added to 100 parts by mass of the PET-G resin.) After kneading with a twin screw extruder, extruded pellets were prepared at 200 ° C. . The obtained pellets were injection-molded at 205 ° C. to prepare a 3 mm-thick No. 1 test piece and a 10 mm × 10 mm × 3 mm test piece.
[0023]
(1) The tensile test was performed based on JISK7113. The above test piece No. 1 was used as the test piece. The prepared test piece was stored for 1 day under conditions of a temperature of 23 ° C. and a humidity of 50% RH.
A Tensilon universal testing machine RTC-1310 manufactured by Orientec Co., Ltd. was used as the test equipment, and the distance between the grips was 120 mm and the test speed was 200 mm / min.
[0024]
(2) Transparency The test pieces of 10 mm × 10 mm × 3 mm were evaluated by observation with the naked eye after storage for 1 day under the condition of a temperature of 23 ° C. The evaluation is shown by ○-× method.
○: Transparency good △: Transparency somewhat poor ×: Transparency poor
(3) Bleed inhibition The test piece of 10 mm × 10 mm × 3 mm was stored for 1 week under the conditions of a temperature of 50 ° C. and a humidity of 50% RH, and then evaluated by observation with the naked eye. The evaluation is shown by ○-× method.
○: Bleed suppression good △: Bleed suppression somewhat poor ×: Bleed suppression poor
(4) Test results The test results are shown in Table 1.
In addition, the addition amount in a table | surface is a mass part of the sample with respect to 100 mass parts of resin.
[0027]
[Table 1]

[0028]
【The invention's effect】
By incorporating the diacetyl monoacylglycerol according to the present invention into a PET-G resin as a plasticizer, a resin processed product having excellent flexibility and bleed suppression can be obtained without impairing transparency, and application to food packaging, etc. The width of is widened.

Claims (1)

Oite ethylene glycol some cyclohexanedimethanol substituted with with PET-G resins is an amorphous copolyester which denatured components of polyethylene terephthalate (PET), PET-G resin per 100 parts by weight, the ester PET-G resin characterized by containing 10 to 50 parts by mass of diacetyl monoacylglycerol which is one or a mixture of two or more selected from fatty acids having 8 to 14 carbon atoms Composition.