JP2002053741A - Processability improver for pet-g resin, and pet-g resin composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an improver which gives an excellent calendaring processability without hindering the transparency of PET-G product to be obtained and to provide a PET-G resin composition containing the improver. SOLUTION: The processability improver for PET-G resins, comprising an ester which is constituted with an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid, is characterized in that the improver has as the main component a mixture of one or more kinds of the esters in which at least one free carboxylic group remains on one molecule of the above ester; the PET-G resin composition contains this processability improver.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to, for example, PET-
The present invention relates to a moldability improver in calendering of a G resin and a PET-G resin composition containing the improver.

[0002]

2. Description of the Related Art Polyethylene terephthalate (PET)
Polyester-based resins such as are widely used as containers and packaging materials for foods and pharmaceuticals, electronic equipment, office supplies and other cases, molded container lids, and ID card sheets.

[0003] In general, these polyester resin films and sheets are formed by extrusion. However, the molding speed in extrusion molding is low, and the productivity is not good. On the other hand, as a method of high productivity in forming a film or a sheet, there is a calendering method, which has been conventionally used for a vinyl chloride resin sheet or the like.

When a film or sheet is formed by this calendering process, it is necessary to sufficiently melt the resin. However, the melting causes the polyester resin to strongly adhere to the calender rolls, making the processing difficult. When the melting is suppressed and the processing temperature is lowered, the adhesion of the resin to the roll surface is improved, but the surface of the formed film or sheet becomes rough, and a satisfactory product cannot be obtained.

[0005] PET resins are generally and widely used as polyester-based resins, but it is difficult to produce films and sheets by calendering because PET resins have high crystallinity.

As a resin in which the disadvantages of the PET resin caused by the crystallinity are improved, glycol-modified PET (this product) is a non-crystalline copolyester which is modified by replacing a part of the ethylene glycol component of polyethylene terephthalate with cyclohexane dimethanol and modifying it. In the description, PET-
G. ) Has been developed and sold, but the problem of sticking to the roll surface during calendering, which is a property of polyester resins, has not been solved.

[0007] As a method of solving such a problem in calendering of a polyester resin, there is known a method in which the ethylene glycol component of a polyethylene terephthalate resin is reduced to 10 to 10%.
Butyl stearate, cetyl palmitate, stearic acid monoglyceride, stearic acid diglyceride, stearic acid triglyceride,
It is disclosed that a fatty acid ester lubricant such as an ester of montanic acid, an ester of montanic acid partially saponified with calcium, a wax ester, or an aliphatic dicarboxylic acid ester is used (Japanese Patent Application Laid-Open No. 11-343353).
However, the fatty acid esters disclosed in this publication are not sufficiently effective, fail to provide satisfactory roll releasability, and cause a problem that the sheet becomes cloudy if the amount of addition is increased to obtain releasability.

[0008] For these reasons, there has been a demand for a processability improver for polyester resins having good roll releasability which does not hinder transparency.

[0009]

SUMMARY OF THE INVENTION The present invention relates to the obtained P
It is an object of the present invention to provide an improver that provides excellent calenderability without impairing the transparency of an ET-G product, and a PET-G resin composition containing the improver.

[0010]

Means for Solving the Problems The inventors of the present invention have made intensive studies to solve the above-mentioned problems, and as a result, the present invention relates to an ester comprising an aliphatic compound having a hydroxyl group in a molecule and a polybasic acid, The inventors have found that an ester in which at least one free carboxyl group remains per molecule provides excellent calenderability without impairing the transparency of a PET-G product, and completed the present invention.

That is, the present invention has the following configuration. 1. An ester composed of an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid, and containing, as a main component, one or a mixture of two or more esters in which at least one free carboxyl group remains per one molecule of the ester. A processability improver for PET-G resin.

2. The aliphatic compound having a hydroxyl group in the molecule is a higher aliphatic monohydric alcohol or a polyhydric alcohol having 2 to 6 carbon atoms and / or a partial ester of a polycondensate thereof and a higher fatty acid. 2. The processability improver for PET-G resin according to 1 above.

3. 3. The processability improver for PET-G resin according to the above 1 or 2, wherein the polybasic acid is an aliphatic dicarboxylic acid or a tricarboxylic acid.

4. A PET-G resin composition comprising the processability improver described in the above item 1, 2 or 3.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below. The resin targeted by the present invention is an amorphous copolyester (PET-G) which is obtained by modifying a part of the ethylene glycol component of polyethylene terephthalate with cyclohexanedimethanol and modifying it.

The "aliphatic compound having a hydroxyl group in the molecule" constituting the ester of the present invention composed of an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid includes, for example, lauryl alcohol, myristyl alcohol, Cetyl alcohol, stearyl alcohol, aralkyl alcohol, aliphatic monohydric alcohols such as behenyl alcohol, ethylene glycol, 1,2-propanediol,
1,3-propanediol, 1,4-butanediol,
2,3-butanediol, 1,5-pentanediol,
1,6-hexanediol, glycerin, trimethylolpropane, erythritol, pentaerythritol,
Dipentaerythritol, xylitol, mannitol, sorbitol, dihydric to polyhydric alcohols such as sorbitan and / or polycondensates thereof, or these polyhydric alcohols and caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, Stearic acid, behenic acid,
Examples thereof include partial esters with aliphatic carboxylic acids such as oleic acid, linoleic acid, linolenic acid, and erucic acid.

The "polybasic acid" constituting the ester of the present invention composed of an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid includes, for example, oxalic acid, malonic acid,
Aliphatic dicarboxylic acids such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, maleic acid, fumaric acid, citraconic acid, itaconic acid, malic acid, tartaric acid, or tricarbaric acid; Examples thereof include aliphatic tricarboxylic acids such as citric acid.

The ester of the present invention comprising an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid is one of the above-mentioned polybasic acid and an aliphatic compound having a hydroxyl group in the molecule such as an alcohol. It can be prepared by performing an esterification reaction by a known method using a species or a mixture of two or more species. Further, those reactants can be used alone or as a mixture.

The processability improver for PET-G resin according to the present invention comprises one or a mixture of two or more of the esters of the present invention. I do not care.

In the ester of the present invention comprising an aliphatic compound having a hydroxyl group in a molecule and a polybasic acid, it is necessary that at least one carboxyl group derived from the polybasic acid remains in the reaction product. An ester in which all of the carboxyl groups of the polybasic acid molecule are used in the reaction as an ester does not exhibit the effect of improving the polyester resin which is the object of the present invention.

By blending the polyester resin of the present invention with an ester composed of an aliphatic compound having a hydroxyl group in a molecule and a polybasic acid, the surface of the PET-G resin composition is calendered during calendering. Is improved and a product with excellent transparency is obtained.

The amount of the ester of the present invention composed of an aliphatic group having a hydroxyl group in the molecule and a polybasic acid, relative to the PET-G resin, of 0.1 to 3.0 with respect to 100 parts by mass of the PET-G resin. A range of parts by weight is appropriate. If the addition amount is less than 0.1 part by mass, the adhesion of the resin to the surface of the calender roll is not sufficiently improved, and if the addition amount is more than 3.0 parts by mass, the transparency of the product may be lowered.

PET of ester composed of an aliphatic compound having a hydroxyl group in the molecule and a polybasic acid according to the present invention
The method of compounding with -G resin is not particularly limited as long as they can be uniformly mixed. For example, mixing with various mixing machines such as a Banbury mixer and a heating roll can be used.

[0024]

Hereinafter, the present invention will be described with reference to Examples.
The present invention is not limited to these examples.

<Test Sample> Glycerin succinate laurate ester 1 mol of glycerin monolaurate [distilled monoglyceride: RIQUEMAL M-300 manufactured by Riken Vitamin Co., Ltd.] and 1 mol of succinic anhydride were esterified by a known method.

2. Glycerin succinate stearic acid ester It was obtained by subjecting 1 mol of glycerin monostearate [distilled monoglyceride: Richemal S-100 manufactured by Riken Vitamin Co., Ltd.] to 1 mol of succinic anhydride by a known method.

3. Glycerin Succinic Acid Behenic Acid Ester was obtained by subjecting 1 mol of glycerin monobehenate [distilled monoglyceride: Richemal B-100 manufactured by Riken Vitamin Co., Ltd.] to 1 mol of succinic anhydride by a known method.

4. Glycerin citrate laurate Ester was obtained by subjecting 1 mol of glycerin monolaurate and 1 mol of citric acid to an esterification reaction by a known method.

5. Glycerin citrate stearic acid ester It was obtained by subjecting 1 mol of glycerin monostearate and 1 mol of citric acid to an esterification reaction by a known method.

6. Glycerin citrate behenate Ester was obtained by subjecting 1 mol of glycerin monobehenate and 1 mol of citric acid to an esterification reaction by a known method.

7. Stearyl citrate 1 mol of citric acid and 2 mol of stearyl alcohol [Kalcol 8688 manufactured by Kao Corporation] were esterified by a known method.

8. Polyethylene wax [HIWAX200P manufactured by Mitsui Petrochemical Industries, Ltd.]

9. Stearic acid [Sakura beef stearic acid manufactured by NOF Corporation]

<Tests and Evaluations> PET-G resin [EAS
EASTER PET manufactured by TMAN CHEMICAL
-G6763] A predetermined amount (parts by mass) of the test sample was blended with 100 parts by mass, kneaded by a twin-screw extruder, and then pelletized. The obtained pellets were kneaded with an 8-inch roll heated to 155 ° C. for 5 minutes, formed into a sheet having a thickness of 2 mm, and the roll releasability during the formation was observed and evaluated.
The obtained sheet was pressed at 180 ° C. and 130 MPa for 5 minutes to prepare a 5 mm-thick pressed sheet, and the transparency was evaluated with the naked eye. However, the evaluation was based on the following criteria.

(Releasability) ：: Smooth peeling without sticking to the roll △: Slightly sticking to the roll ×: Sticking to the roll and poor peeling

(Transparency) ：: Good transparency Δ: Slightly poor transparency ×: Poor transparency

[0037]

[Table 1]

[0038]

By incorporating the improver of the present invention,
Good calendering properties are obtained, and a PET-G processed product with excellent transparency is obtained.

Claims (4)

[Claims] 1. An ester comprising an aliphatic compound having a hydroxyl group in a molecule and a polybasic acid, wherein at least one free carboxyl group per ester molecule has at least one free carboxyl group remaining. A processability improver for a PET-G resin, comprising a mixture as a main component. 2. An aliphatic compound having a hydroxyl group in the molecule,
2. The PET-G resin according to claim 1, which is a partial ester of a higher aliphatic monohydric alcohol or a polyhydric alcohol having 2 to 6 carbon atoms and / or a polycondensate thereof and a higher fatty acid. Processability improver. 3. The processability improver for a PET-G resin according to claim 1, wherein the polybasic acid is an aliphatic dicarboxylic acid or a tricarboxylic acid. 4. A PET-G resin composition comprising the processability improver according to claim 1, 2 or 3.