Polylactic acid stereocomplex, process for production thereof, and nucleating agent for polylactic acid resin

A technology of stereocomplexes and polylactic acid resins, which can be used in transportation, packaging, thin material processing, etc., and can solve the problems of not being able to obtain high melting point stereocomplexes.

Inactive Publication Date: 2014-06-04
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, using this method, the remaining part of poly-L-lactic acid or poly-D-lactic acid crystallizes separately, and it is impossible to obtain a stereocomplex with a high melting point.

Method used

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  • Polylactic acid stereocomplex, process for production thereof, and nucleating agent for polylactic acid resin
  • Polylactic acid stereocomplex, process for production thereof, and nucleating agent for polylactic acid resin
  • Polylactic acid stereocomplex, process for production thereof, and nucleating agent for polylactic acid resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] 50 parts of L-lactide was uniformly dissolved in a reaction vessel with a stirring device at 120°C under nitrogen, then the temperature was changed to 140°C, 0.05 part of tin octoate was added, and then polymerization was carried out for 1.1 hours. After the polymerization reaction was finished, the reactant was dissolved in chloroform, precipitated under stirring in methanol (10 times the amount of chloroform), and the monomer was completely removed to obtain (A) poly-L- lactic acid.

[0103] In a reaction vessel equipped with a stirring device, 50 parts of D-lactide were uniformly dissolved at 120°C under nitrogen gas, then the temperature was changed to 140°C, 0.05 part of tin octoate was added, and polymerization was carried out for 1.1 hours. After the polymerization reaction was finished, the reactant was dissolved in chloroform, precipitated under stirring in methanol (10 times the amount of chloroform), and the monomer was completely removed to obtain (B) poly D...

Embodiment 2

[0107] (A) Poly L-lactic acid and (B) Poly D-lactic acid were prepared in the same manner as in Example 1. (A) poly-L-lactic acid and (B) poly-D-lactic acid and (C-1) crystal nucleating agent (talc: MicroAceP-6 (manufactured by Nippon Talku Co., Ltd.)) in (A) / (B) / (C -1) = 50 / 50 / 1 weight ratio dry-blended in advance, then supplied to a Banbury kneader with a screw rotation speed of 10 rpm, and kneaded at a barrel set temperature of 185°C. In Example 2, dust-like substances were precipitated during kneading, and all of them became dust-like when the kneading time was about 30 seconds, thereby obtaining a polylactic acid resin composition with an average particle diameter of 5 μm. During the mixing of the Banbury type mixer, the mixing state of the sample was observed from the upper window of the mixer. As a result, in Example 2, (A) poly L-lactic acid and (B) poly D-lactic acid were repeatedly mixed. A chaotic hybrid state of stretching and collapsing.

[0108] The above sampl...

Embodiment 3

[0110] (A) Poly L-lactic acid and (B) Poly D-lactic acid were prepared in the same manner as in Example 1. (A) poly-L-lactic acid, (B) poly-D-lactic acid and (C-1) crystal nucleating agent (talc: MicroAce P-6 (manufactured by Nippon Turku Corporation)) and (C-2) crystal nucleating agent ( Phosphate ester metal salt: NA-71 (manufactured by ADEKA Corporation)) dry-blended in advance at a weight ratio of (A) / (B) / (C-1) / (C-2)=50 / 50 / 1 / 1 Mixed, then supplied to a Banbury type kneader with a screw rotation speed of 10 rpm, and kneaded at a barrel set temperature of 185°C. In Example 3, dust-like substances were precipitated during kneading, and all of them became dust-like when the kneading time was about 30 seconds, thereby obtaining a polylactic acid resin composition with an average particle diameter of 5 μm. During the mixing of the Banbury type mixer, the mixing state of the sample was observed from the upper window of the mixer. As a result, in Example 3, (A) poly L-lactic acid...

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Abstract

The polylactic acid stereocomplex of the invention has a crystal melting peak temperature of 215°C or more, wherein the crystal melting peak is a single peak and has a peak half width of 12°C or less, and a crystal melting enthalpy of 60 J/g or more as measured by differential scanning calorimetry. The polylactic acid stereocomplex of the invention has a high melting point, good heat resistance, and a high level of mechanical properties and chemical resistance. The method of the invention for producing a polylactic acid stereocomplex includes chaotic mixing of 30 to 70 parts by weight of (A) poly-L-lactic acid and 30 to 70 parts by weight of (B) poly-D-lactic acid based on 100 parts by weight of the total of (A) poly-L-lactic acid and (B) poly-D-lactic acid. The polylactic acid stereocomplex producing method of the invention can produce a polylactic acid stereocomplex having, as measured by differential scanning calorimetry, a crystal melting peak temperature of 215°C or more, wherein the crystal melting peak is a single peak and has a peak half width of 12°C or less, and a crystal melting enthalpy of 60 J/g or more.

Description

technical field [0001] The present invention relates to polylactic acid stereocomplex, its production method and nucleating agent for polylactic acid resin. In particular, the present invention relates to a polylactic acid stereocomplex having excellent heat resistance, mechanical properties, and chemical resistance, an effective production method thereof, a nucleating agent containing the above polylactic acid stereocomplex, and the use of the polylactic acid stereocomplex. A method for producing a nucleating agent polylactic acid resin composition. Background technique [0002] Recently, from the viewpoint of protecting the global environment, attention has been drawn to biodegradable polymers that are decomposed in the natural environment by the action of microorganisms existing in soil and water, and various biodegradable polymers have been developed. Among them, known as melt-moldable biodegradable polymers are, for example, polyhydroxybutyrate, polycaprolactone, aliph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08J3/20C08L101/16B29C48/40B29C48/57B29C48/625B29C48/92
CPCC08K5/0016C08K3/0008C08L2205/02C08K5/0083C08L67/04C08J3/005C08J2367/04C08K5/0008Y10T428/2982B29C48/57B29C48/92B29C48/625B29C48/022B29C2948/92695B29C2948/92704B29C2948/92714B29C48/40C08L2666/18C08G63/08C08G63/78C08J3/20C08L101/16
Inventor 落合伸一郎高本达也小林定之
Owner TORAY IND INC
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