Multilayered rotomoulded articles comprising a layer of polyester

Patent metadata

Field	Value
Publication number	US-9862165-B2
Application number	US-201214343542-A
Country	US
Kind code	B2
Filing date	Sep 7, 2012
Priority date	Sep 9, 2011
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

An at least two layer rotomolded article can include a layer A and a layer B. Layer A can include an aliphatic polyester selected from polyhydroxyalkanoate, poly(lactic acid), polycaprolactone, copolyesters and polyesteramides. Layer A can include a polyolefin. Layer A can include a co- or ter-polymer that includes ethylene or styrene monomer, an unsaturated anhydride-containing monomer, epoxide-containing monomer, or carboxylic acid-containing monomer, and a (meth)acrylic ester monomer. Layer B can include a polyolefin and a polyester. Layer B can include a co- or ter-polymer that includes an ethylene or a styrene monomer, an unsaturated anhydride-containing monomer, epoxide-containing monomer, or carboxylic acid-containing monomer, and a (meth)acrylic ester monomer.

First claim

The invention claimed is:

1. A rotomoulded article comprising:
at least two layers including an outermost layer A and at least an inner foamed layer B;
wherein the outermost layer A comprises:
at least 50 wt % of an aliphatic polyester selected from polyhydroxyalkanoate, poly(lactic acid), polycaprolactone, copolyesters and polyesteramides;
from 0 to 40 wt % of a polyolefin; and
no more than 10 wt % of a co- or ter-polymer that comprises from 50 wt % to 99.9 wt % of ethylene or styrene monomer; from 0.1 wt % to 15 wt % of an unsaturated anhydride-containing monomer, epoxide-containing monomer, or carboxylic acid-containing monomer; and 0 to 35 wt % of a (meth)acrylic ester monomer;

wherein the inner foamed layer B comprises:
at least 50 wt % a polyolefin;
from 0.5 to 30 wt % of a polyester;
from 0.1 to 20 wt % of a co- or ter-polymer that comprises from 50 wt % to 99.9 wt % of an ethylene or a styrene monomer; from 0.1 wt % to 15 wt % of an unsaturated anhydride-containing monomer, epoxide-containing monomer, or carboxylic acid-containing monomer; and 0 to 35 wt % (meth)acrylic ester monomer, and
wherein the article comprises at least one cavity formed from a polyurethane.

2. The article of claim 1 , wherein the polyolefin of the inner foamed layer B is different from the polyolefin of the outermost layer A.

3. The article of claim 1 , wherein the polyester of the inner foamed layer B is different from the polyester of the outermost layer A.

4. The article of claim 1 , wherein the co- or ter-polymer of the inner foamed layer B is different from the co- or ter-polymer of the outermost layer A.

5. The article of claim 1 , wherein the outermost layer A comprises 75 to 100 wt % of the aliphatic polyester.

6. The article of claim 1 , wherein the polyester in the outermost layer A and/or the inner foamed layer B is a polylactic acid).

7. The article of claim 1 , wherein the inner foamed layer B is adjacent to the outermost layer A.

8. The article of claim 1 , wherein the polyolefin in the inner foamed layer B is a polyethylene.

9. The article of claim 1 , wherein the polyolefin in the outermost layer A is a polyethylene.

10. The article of claim 1 , wherein the unsaturated anhydride-containing monomer, epoxide-containing monomer, or carboxylic acid-containing monomer of the co- or ter-polymer in the outermost layer A and/or the inner foamed layer B is maleic anhydride or glycidyl methacrylate.

11. The article of claim 1 , wherein the outermost layer A and/or the inner foamed layer B comprises the terpolymer, and wherein the (meth)acrylic ester monomer of the terpolymer in the outermost layer A and/or the inner foamed layer B is present in an amount from 0.1 to 35 wt % based on each layer and is methyl (meth)acrylate, ethyl (meth)acrylate, n-butyl (meth)acrylate, iso-butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, or n-octyl (meth)acrylate.

12. The article of claim 1 , wherein the article comprises a layer C comprising from 50 to 100 wt % of a polyolefin.

13. The article of claim 12 , wherein layer C is adjacent to the inner foamed layer B.

14. The article of claim 12 , wherein the polyolefin of layer C is a polyethylene.

15. The article of claim 12 , wherein the article is a three layer article, wherein:
layer A is the outermost layer;
the inner foamed layer B is an intermediate layer disposed between the outermost layer A and layer C; and
layer C is the innermost layer.

16. The article of claim 1 , wherein an outer surface of the article is painted.

Assignees

• Maziers Eric
• Total Res & Technology Feluy

Inventors

• Maziers Eric

Classifications

• B32B2307/54

  Yield strength; Tensile strength · CPC title

• C08L23/00

  Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers · CPC title

• B32B2270/00

  Resin or rubber layer containing a blend of at least two different polymers · CPC title

• B32B2255/26

  Polymeric coating · CPC title

• B29C41/003

  characterised by the choice of material · CPC title