Resin composition, molded article, and production methods thereof

Inactive Publication Date: 2010-09-09
TEIJIN CHEM LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]An object of the present invention is to provide a resin composition and a molded article that use a biomass-derived polylactic acid and cause small burdens on the environment. Another object of the present invention is to provide a resin composition which comprises a thermoplastic resin (component A) and a polylactic acid (component B) and has

Problems solved by technology

However, the properties of the polylactic acids such as mechanical properties and heat resistance are unsatisfactory in order for the polylactic acids to be used as industrial materials in fields in which thermoplastic resins are used.
Further, the polylactic acids have a problem that they show significantly low hydrolysis resistance when used under wet and hot conditions because they have biodegradability.
However, when this stereocomplex polylactic acid is produced by an industrially advantageous melt-extrusion process, it is very difficult to achieve stereo-complexification to a sufficient level.
When stereo-complexification is insufficient, the stereocomplex polylactic acid cannot exhibit good h

Method used

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  • Resin composition, molded article, and production methods thereof
  • Resin composition, molded article, and production methods thereof
  • Resin composition, molded article, and production methods thereof

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[Resin Composition]

[0064]A resin composition of the present invention is a resin composition comprising 100 parts by weight of thermoplastic resin (component A) and 1 to 200 parts by weight of polylactic acid (component B).

[0065]The thermoplastic resin (component A) is preferably a polycarbonate resin, polyester resin, polyolefin resin or styrene resin. These may be used alone or in combination of two or more.

(Aromatic Polycarbonate Resin)

[0066]An aromatic polycarbonate resin (hereinafter may be simply referred to as “polycarbonate”) is obtained by reacting a dihydric phenol with a carbonate precursor. Illustrative examples of the reaction method include interfacial polycondensation, melt transesterification, solid-phase transesterification of carbonate prepolymer, and ring-opening polymerization of cyclic carbonate compound. The component A is preferably the aromatic polycarbonate resin, particularly preferably a bisphenol-A-based aromatic polycarbonate resin.

[0067]Specific example...

second embodiment

Molded Articles

[0267]The present invention includes a molded article that comprises a polylactic acid (component B) showing a proportion (R195 or higher) of melt peaks at 195° C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%.

(Component B)

[0268]The polylactic acid (component B) is as described in the above section of the first embodiment. Thus, the component B preferably comprises a polylactic acid (component B-1) that comprises 90 to 100 mol % of L-lactic acid unit and 0 to 10 mol % of D-lactic acid unit and / or units other than lactic acid and a polylactic acid (component B-4) that comprises 90 to 100 mol % of D-lactic acid unit and 0 to 10 mol % of L-lactic acid unit and / or units other than lactic acid, and the weight ratio of the component B-1 to the component B-4 (component B-1 / component B-4) is preferably within a range of 10 / 90 to 90 / 10.

[0269]The R195 or higher of the component B in the mo...

production example 1

Production of Component B-3

[0327]50 parts by weight of L-lactide (Musashino Chemical Laboratory, Ltd.) was charged into a polymerization tank, the inside of the system was substituted with nitrogen, 0.05 parts by weight of stearyl alcohol and 25×10−3 parts by weight of tin octylate as a catalyst were added, and polymerization was conducted at 190° C. for 2 hours to obtain a component B-3. The obtained component B-3 had a reduced viscosity of 1.48 (ml / g), a weight average molecular weight of 110,000, a melting point (Tm) of 158° C. and a crystallization point (Tc) of 117° C.

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Abstract

There are provided a resin composition comprising a polylactic acid which (i) comprises a poly-L-lactic acid (component B-1) and a poly-D-lactic acid (component B-4), (ii) has a weight ratio of the component B-1 to the component B-4 (component B-1/component B-4) of 10/90 to 90/10, and (iii) shows a proportion of melt peaks at 195° C. or higher to all melt peaks in a temperature rising process in measurement by a differential scanning calorimeter (DSC) of at least 20%; a molded article of the resin composition; and methods for producing the resin composition and the molded article.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a resin composition and a molded article that contain a polymer obtained from biomass resources. More specifically, it relates to a resin composition that contains a specific polylactic acid and has excellent heat resistance and hydrolysis resistance, and a molded article of the resin composition.BACKGROUND OF THE ART[0002]Thermoplastic resins have excellent heat resistance, mechanical properties, impact resistance and dimensional stability and are widely used in fields such as an office automation equipment field, automobile field and electric / electronic part field. On the other hand, however, the thermoplastic resins also have an aspect that most of raw materials thereof rely on oil resources.[0003]In recent years, in view of fear of exhaustion of the oil resources and a problem of increase of carbon dioxide in air that causes global warming, carbon-neutral biomass resources that do not rely on oils for raw materials and...

Claims

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Application Information

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IPC IPC(8): C08L69/00C08L73/00C08K3/34B29C45/00B29C49/00
CPCC08K3/0033C08K3/34C08K5/51C08L23/02C08L25/04C08L67/02C08L67/04C08L69/00C08L2666/18C08K3/013B29C45/00C08G63/06C08L101/16
Inventor HIRONAKA, KATSUHIKOKONDO, FUMITAKAINO, KEIICHIROMATSUNO, YUICHITOYOHARA, KIYOTSUNASUZUKI, HIROTAKA
Owner TEIJIN CHEM LTD
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