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Polylactic acid resin multilayer sheet and molded body made of same

A resin-like, polylactic acid technology, applied in the field of polylactic acid-based resin laminates, can solve the problems of non-existence, uninspired solutions, and no disclosure of heat resistance and plant-based impact resistance, and achieves excellent impact resistance. Effect

Inactive Publication Date: 2012-07-18
TORAY IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, there is known a method of producing a resin with excellent hydrolyzability by mixing an α-hydroxycarboxylic acid polymer containing polylactic acid with a poly(meth)acrylate resin (refer to Patent Document 1); A method of obtaining a resin composition excellent in weather resistance and moldability using an acrylic compound (refer to Patent Document 2), but none of them discloses improvements in heat resistance and high-temperature rigidity
[0006] On the other hand, Patent Document 3 describes that a film obtained by mixing polylactic acid and poly(meth)acrylate resin and stretching in at least one axial direction has excellent high-temperature rigidity. Yes, in Patent Document 4, it is described that the compatibility of polymethyl methacrylate with a weight average molecular weight of 20,000 to 300,000 and polylactic acid is significantly improved, and only one Tg is observed, which has the same Tg as before blending. The intermediate value of the Tg of the two resins shows that the heat resistance is improved, but neither of them discloses a technical idea for achieving both heat resistance and vegetable density, or impact resistance, and there is no inspiration for the solution.

Method used

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  • Polylactic acid resin multilayer sheet and molded body made of same
  • Polylactic acid resin multilayer sheet and molded body made of same
  • Polylactic acid resin multilayer sheet and molded body made of same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] As the preparation method of the above-mentioned polylactic acid-based resin, details will be described later, and a known polymerization method can be used, that is, a direct polymerization method from lactic acid, a ring-opening polymerization method via lactide, and the like can be used.

[0048] The melting point of the polylactic acid-based resin used in the present invention is not particularly limited, but is preferably 120°C or higher, more preferably 150°C or higher. The melting point of the above-mentioned polylactic acid resin can generally be improved by increasing the optical purity of the lactic acid component, and the polylactic acid resin with a melting point of 120° C. or higher can be obtained by containing 90 mol% to 100 mol% of the L-form, or 90 mol% to 100 mol% In addition, the polylactic acid resin with a melting point of 150° C. or higher can be obtained by containing 95 mol % to 100 mol % of the L form, or 95 mol % to 100 mol % of the D form.

[...

Embodiment 1

[0296] For layer A, use polylactic acid (P-1), polymethyl methacrylate (Q-4), and impact modifier (R-8) in a ratio of 93:2:5, and for layer B, Polylactic acid (P-1) and polymethyl methacrylate (Q-4) are supplied to independent respective vented twin-screw extruders at a ratio of 30:70, and the temperature of the die is set at The T-shaped die at 230°C is extruded together, and it is adhered to the casting drum cooled to 10°C by applying static electricity, and cooled and solidified to form B layer:A layer:B layer An unstretched sheet having a thickness ratio of 1:8:1 and an overall thickness of 0.5 mm.

[0297] The impact resistance of the obtained sheet was good, and the heat resistance of the molded article obtained from this sheet was also good, and the vegetation degree was also high.

Embodiment 2～17、19～35

[0298] (Examples 2-17, 19-35, Comparative Examples 1-7)

[0299] In addition to changing the polylactic acid resin (P), poly(meth)acrylate resin (Q), impact modifier (R) constituting each layer, and the layer composition and thickness as shown in the table, Others were carried out in the same manner as in Example 1.

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Abstract

The invention discloses a polylactic acid resin multilayer sheet comprising a layer A and a layer B respectively composed of a polylactic acid resin composition. The layer A and the layer B respectively contain a specific amount of a poly(meth)acrylate. This polylactic acid resin multilayer sheet is excellent in transparency and heat resistance, and enables to obtain a molded body having a high plant matter content.

Description

technical field [0001] The present invention relates to a polylactic acid-based resin laminate sheet with a high degree of vegetation for obtaining moldings such as various shape-retaining utensils and containers that require heat resistance, transparency, and impact resistance, and a polylactic acid-based resin laminated sheet using the polylactic acid-based resin. Formed body obtained by lamination. Background technique [0002] In recent years, with the improvement of environmental awareness, the problem of waste disposal of plastic products has attracted attention, and containers such as shape-preserving utensils, food trays, and beverage cups used in display packaging of various commodities have been developed and used. Various biodegradable plastic sheet products. Among them, polylactic acid is attracting the most attention as a promising material because it has a high glass transition temperature of about 60° C. as a biodegradable plastic and is transparent. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36
CPCB32B27/30C08L67/04C08L33/08B32B27/36C08L2205/02Y10T428/2982Y10T428/2495Y10T428/2991Y10T428/2998Y10T428/24942Y10T428/31786Y10T428/31935Y10T428/31797C08L2666/18C08L2666/02C08L2666/04B32B27/08B32B27/308B32B2307/306B32B2307/412B32B2367/00B32B2333/08
Inventor 山村刚平新沼馆浩木村将弘
Owner TORAY IND INC
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