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Polylactic acid resin composition, molded body thereof and polylactic acid compound

A polylactic acid and resin-like technology, which is applied in the field of polylactic acid resin compositions and moldings, can solve the problems of inability to ensure transparency and opacity, achieve the effect of improving crystallization speed and transparency, and shortening the molding cycle

Inactive Publication Date: 2009-07-29
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, when trying to improve the heat resistance of polylactic acid by heat treatment (annealing) to improve the crystallinity, there is usually the following problem: crystals (such as spherulites) having a size equal to or greater than the wavelength of light that cause light scattering grow rapidly, become opaque
However, although this method improves slip properties, it cannot ensure transparency due to the addition of inorganic fillers.

Method used

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  • Polylactic acid resin composition, molded body thereof and polylactic acid compound
  • Polylactic acid resin composition, molded body thereof and polylactic acid compound
  • Polylactic acid resin composition, molded body thereof and polylactic acid compound

Examples

Experimental program
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Effect test

Embodiment

[0183] Hereinafter, the present invention will be more specifically described based on examples, but the present invention is not limited to these examples.

[0184]

[0185] Gel permeation chromatography (GPC) ["Shodex GPC-101" manufactured by Showa Denko Co., Ltd., column: "PLgel mixd c" manufactured by PolymerLab Co., Ltd. × 2 in series, column temperature: 40°C, mobile phase: chloroform, Flow rate: 1ml / min], obtained by comparing with polystyrene standard samples.

[0186]

[0187] It calculated|required by DSC ("DSC-60" by Shimadzu Corporation). Weigh 5 to 6 mg of the non-oriented film obtained by press molding, weigh it into a nitrogen-sealed pan, and put it into a nitrogen-sealed DSC measurement unit preset at 30°C. The temperature was raised, and the mixture was melted at 220° C. for 3 minutes. After melting, it was cooled to 100°C at a cooling rate of 99°C / min, and the time to cool to 100°C was taken as the start time, and the time at which the crystallization p...

Synthetic example 1

[0193] Add 200.0g (1.389 moles) of L-lactide, 2.43g (0.017 moles) of D-lactide, 1.58g (0.00253 moles) of ethylene - Bis-12-hydroxystearyl amide, 16.2 mg of tin octoate, heated up to 190° C. while stirring at 150 rpm under a nitrogen atmosphere. While continuing stirring, polymerization was carried out at 190°C to 200°C for 2 hours. During the polymerization, since stirring became difficult as the viscosity of the polymer increased, the number of revolutions was reduced to 50 rpm while observing the situation. The polymerization was terminated after confirming that the viscosity of the produced polymer was sufficiently increased and the molecular weight (Mw) measured by GPC was 200,000.

[0194] After completion of the polymerization, the polymer was temporarily discharged into a container, and after cooling, it was dissolved in 2000 mL of chloroform. While stirring this chloroform solution, methanol was added little by little. After adding about 2000 mL of methanol, atomiza...

Synthetic example 2

[0196] Using the same reaction apparatus as in Synthesis Example 1, except that 1.58 g (0.00253 moles) of ethylene-bis-12-hydroxystearylamide was changed to 0.36 g (Mw =200, 0.0036 mol of hydroxyl groups), 190.0 g of polylactic acid (B-2) having a partial structure derived from PEG#200 was obtained in the same manner as in Synthesis Example 1. The weight average molecular weight (Mw) of the obtained polylactic acid (B-2) was 214,000.

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Abstract

Disclosed is a resin composition which is improved in heat resistance (high crystallinity) and transparency without deteriorating toughness intrinsic to polylactic acid resins. Also disclosed are a molded body obtained from such a resin composition, and a novel polylactic acid compound used in such a resin composition. Specifically disclosed is a polylactic acid resin composition characterized by containing a linear polylactic acid compound (A) having a moiety represented by the following formula (1): -X1-R1-X2- and a weight average molecular weight (Mw) of 5,000-500,000. In the formula (1), X1 and X2 independently represent an O atom, an S atom or an NH group, and R1 represents a divalent group containing at least one aromatic ring or aliphatic ring. The hydrocarbon group may contain an O, N or S atom.

Description

technical field [0001] The present invention relates to a polylactic acid-based resin composition with improved transparency, crystallization rate, and heat resistance, and a molded article formed from the composition. In addition, the present invention also relates to a novel polylactic acid compound used in the above composition. Background technique [0002] As awareness of global environmental issues increases, depletion of fossil raw materials and petroleum resources and increase in carbon dioxide are seen as problems. Therefore, research and development of biodegradable resins such as aliphatic polyesters and resins synthesized from plants are actively carried out. Among aliphatic polyesters, polylactic acid, which has excellent moldability, has attracted attention as a plant-derived resin made of lactic acid obtained by fermentation of grain resources such as corn as a raw material. [0003] However, polylactic acid has disadvantages of being hard and brittle, and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08G63/06C08J5/00C08K5/20C08L101/16
CPCC08G2261/126C08L67/04C08L69/005C08K5/0083C08G63/06C08K5/20C08G63/60C08L2205/02C08L2666/18
Inventor 浦上达宣樋口长二郎
Owner MITSUI CHEM INC