Process for production of polylactic acid resin composition

a technology composition, which is applied in the direction of applications, inks, dragees, etc., can solve the problems of poor product quality, achieve excellent heat resistance, improve crystallization velocity and heat resistance of polylactic acid resin composition, and accelerate crystallization velocities

Inactive Publication Date: 2014-10-02
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention relates to a method for producing a polylactic acid resin composition with improved crystallization velocity, molding workability at low temperatures, and heat resistance. The method involves subjecting an organic crystal nucleating agent to a wet pulverization in the presence of a carboxylic acid ester and a phosphoric ester, which serve as a crystal nucleating agent. The resulting finely pulverized organic crystal nucleating agent composition is then melt-kneaded with a raw material for the polylactic acid resin composition to give a polylactic acid resin composition with improved crystallization velocity, molding workability at low temperatures, and heat resistance. The use of the pulverization aid esters allows for the formation of fine particles of the organic crystal nucleating agent, which increases the crystallization velocity of the polylactic acid resin composition.

Problems solved by technology

However, the polylactic acid resin has a slow crystallization velocity, so that if crystallization is carried out, a long time period is required, thereby worsening the productivity.

Method used

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  • Process for production of polylactic acid resin composition
  • Process for production of polylactic acid resin composition

Examples

Experimental program
Comparison scheme
Effect test

production example 1

of Crystal Nucleating Agent Composition

[0206]Seven-hundred and twenty grams of the carboxylic acid ester [(MeEO3)2SA] obtained in Production Example 1 of Carboxylic Acid Ester and 36 g of a zinc salt of an unsubstituted phenylphosphonic acid (manufactured by NISSAN CHEMICAL INDUSTRIES, LTD.: “ECOPROMOTE”) were supplied into a media pulverizer (manufactured by Igarashi Kikai Seizo, “Sand Grinder TSG-6H”: pulverizer volume: 800 mL, filled with 720 g of zirconia beads having sizes of 1 mmφ, filling ratio: 30%, agitation blade diameter: 70 mm) While allowing to flow cold water through a jacket of the pulverizer, the mixture was subjected to a pulverization treatment at a rotational speed of 2,000 r / min (agitation peripheral speed: 7 m / s) for 9 hours, to provide a crystal nucleating agent-1 (finely pulverized zinc salt of phenylphosphonic acid). The temperature during the operation was in the range of from 10° to 90° C.

production example 2

of Crystal Nucleating Agent Composition

[0207]The same procedures as in Production Example 1 were carried out except that the kinds of a carboxylic acid ester was changed to “DAIFATTY-101” (manufactured by DAIHACHI CHEMICAL INDUSTRY CO., LTD., diester formed between adipic acid and a 1 / 1 mixture of diethylene glycol monomethyl ether and benzyl alcohol), to provide a crystal nucleating agent-2 (finely pulverized zinc salt of phenylphosphonic acid).

production example 3

of Crystal Nucleating Agent Composition

[0208]The same procedures as in Production Example 2 were carried out except that the amount of the carboxylic acid ester [(MeEO3)2SA] supplied was changed to 360 g, and at the same time 360 g of “DAIFATTY-101” was supplied, to provide a crystal nucleating agent-3 (finely pulverized zinc salt of phenylphosphonic acid).

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Abstract

A method for producing a polylactic acid resin composition, including the following steps (1) and (2): step (1): subjecting an organic crystal nucleating agent to a wet pulverization in the presence of a carboxylic acid ester having a weight-average molecular weight of from 150 to 600 and a viscosity at 23° C. of from 1 to 500 mP·s and / or a phosphoric ester having a weight-average molecular weight of from 150 to 600 and a viscosity at 23° C. of from 1 to 500 mPa·s to give a finely pulverized organic crystal nucleating agent composition; and step (2): melt-kneading a raw material for a polylactic acid resin composition comprising the finely pulverized organic crystal nucleating agent composition obtained in the step (1) and a polylactic acid resin. The polylactic acid resin composition obtainable by the method of the present invention can be suitably used in various industrial applications, such as daily sundries, household electric appliance parts, packaging materials for household electric appliance parts, and automobile parts.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of co-pending application Ser. No. 13 / 522,648 filed on Jul. 17, 2012, which is a National Phase of PCT International Application No. PCT / JP2011 / 051307 filed on Jan. 25, 2011, which claims priority under 35 U.S.C. 119(a) to Patent Application No. 2010-021475 filed in Japan on Feb. 2, 2010. All of the above applications are hereby expressly incorporated by reference into the present application.TECHNICAL FIELD[0002]The present invention relates to a method for producing a polylactic acid resin composition. More specifically, the present invention relates to a method for producing a polylactic acid resin composition, which can be suitably used as, for example, daily sundries, household electric appliance parts, automobile parts, or the like, and a polylactic acid resin composition obtained by the method.BACKGROUND ART[0003]A polylactic acid resin is inexpensive because L-lactic acid used as a raw material i...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L93/04C08L67/04C08K5/521C08K5/20C08K5/5317C08K5/42
CPCC08J3/201C08L93/04C08K5/0083C08K5/098C08K5/20C08K5/42C08K5/521C08K5/5317C08J2367/04C08L67/04C08K9/10C08K9/04B29B7/007B29B7/72C08J3/20C08K5/11
Inventor TSUBOI, TOMOYATAKENAKA, AKIRAMORI, MASAHIRO
Owner KAO CORP
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