POLYLACTIC ACID-BASED RESIN LAMINATE SHEET AND MOLDED PRODUCT THEREFROM

• US 20090169844A1
• Filed: 11/29/2006
• Published: 07/02/2009
• Est. Priority Date: 11/30/2005
• Status: Active Grant

• Current Assignee: Toray Industries Incorporated
• Original Assignee: Toray Industries Incorporated
• Inventors: Yamamura, Go-hei, Kimura, Masahiro, Shinnumadate, Hiroshi
• Granted Patent: US 7,799,412 B2
• Time in Patent Office: Days
• US Class Current: 428/213
• CPC Class Codes: B32B 2307/306 Resistant to heat
• CPC Class Codes: B32B 2307/412 Transparent
• CPC Class Codes: B32B 2333/08 Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
• CPC Class Codes: B32B 2367/00 Polyesters, e.g. PET, i.e. polyethylene terephthalate
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/30 comprising vinyl (co)polymers; comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/308 comprising acrylic (co)polymers
• CPC Class Codes: B32B 27/36 comprising polyesters
• CPC Class Codes: C08L 2205/02 containing two or more polymers of the same C08L -group
• CPC Class Codes: C08L 2666/02 Organic macromolecular compounds, natural resins, waxes or and bituminous materials
• CPC Class Codes: C08L 2666/04 Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
• CPC Class Codes: C08L 2666/18 Polyesters or polycarbonates according to C08L67/00 - C08L69/00; Derivatives thereof
• CPC Class Codes: C08L 33/08 Homopolymers or copolymers of acrylic acid esters
• CPC Class Codes: C08L 67/04 Polyesters derived from hydroxycarboxylic acids, e.g. lactones C08L67/06 takes precedence
• CPC Class Codes: Y10T 428/24942 including components having same physical characteristic in differing degree
• CPC Class Codes: Y10T 428/2495 Thickness [relative or absolute]
• CPC Class Codes: Y10T 428/2982 Particulate matter [e.g., sphere, flake, etc.]
• CPC Class Codes: Y10T 428/2991 Coated
• CPC Class Codes: Y10T 428/2998 including synthetic resin or polymer
• CPC Class Codes: Y10T 428/31786 Of polyester [e.g., alkyd, etc.]
• CPC Class Codes: Y10T 428/31797 : Next to addition polymer from unsaturated monomers
• CPC Class Codes: Y10T 428/31935 : Ester, halide or nitrile of addition polymer

Abstract

The polylactic acid-based resin laminate sheet is a laminate sheet including Layer A and Layer B of a polylactic acid-based resin composition, and the Layer A and the Layer B contain poly(meth)acrylate in a specified amount. The laminate sheet is excellent in transparency and heat resistance and, in addition, provides a polylactic acid-based resin laminate sheet capable of obtaining a molded product of high biobased content therefrom.

Claims

1. A polylactic acid-based resin laminate sheet having Layer A and Layer B of polylactic acid-based resin compositions containing poly(meth)acrylate-based resin, and, said Layer A and said Layer B satisfy the following condition:

0≦

Xa<

Xb

wherein,

Xa;

containing ratio (wt %) of poly(meth)acrylate-based resin with respect to whole polylactic acid-based resin composition constituting said Layer A

Xb;

containing ratio (wt %) of poly(meth)acrylate-based resin with respect to whole polylactic acid-based resin composition constituting said Layer B.

2. The polylactic acid-based resin laminate sheet according to claim 1, wherein a containing ratio of the polylactic acid resin with respect to the above-mentioned whole resin composition constituting the polylactic acid-based laminate sheet is 10 to 95 wt %.

3. The polylactic acid-based resin laminate sheet according to claim 1, further comprising an impact resistance improver.

4. The polylactic acid-based resin laminate sheet according to claim 3, wherein a containing ratio of the poly(meth)acrylate-based resin plus said impact resistance improver with respect to said whole polylactic acid-based resin composition constituting said Layer B is 30 to 100 wt %.

5. The polylactic acid-based resin laminate sheet according to claim 3, wherein all layers constituting the sheet satisfy the following condition:

|xn_p+(100−

x)n_q−

100n_r|<

4

x;

the containing ratio (wt %) of the polylactic acid-based resin in 100 wt % of total of the polylactic acid-based resin and the poly(meth)acrylate-based resin

n_p;

refractive index of the polylactic acid-based resin

n_q;

refractive index of the poly(meth)acrylate-based resin

n_r;

refractive index of the impact resistance improver.

6. The polylactic acid-based resin laminate sheet according to claim 3, wherein a melt viscosity Va(Pa·

s) of the resin constituting said Layer A and a melt viscosity Vb(Pa·

s) of the resin constituting said Layer B, at a temperature of 220°

C. and a shear rate of 100 sec<sup>−

1</sup>, satisfy the following conditions;

500≦

Va≦

1500

500≦

Vb≦

1500

|Va-Vb|≦

700.

7. The polylactic acid-based resin laminate sheet according to claim 3, wherein respective thickness ratios of Layer A and Layer B with respect to the whole thickness of said polylactic acid-based resin laminate sheet are 10 to 90%.

8. The polylactic acid-based resin laminate sheet according to claim 3, wherein said impact resistance improver is a polyester-based resin of which glass transition temperature is 60°

C. or less.

9. 9 The polylactic acid-based resin laminate sheet according to claim 3, wherein the above-mentioned impact resistance improver is a multilayer structure organic fine particle which has a core portion and 1 or more shell portions covering thereon.

10. A molded product which is constituted by the polylactic acid-based resin laminate sheet described in any one of claims 1 to 9.