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US 2013/0171383 A1Published application
Toughened polyester blends
AssigneeE. I. Du Pont de Nemours and Company
InventorRAMESHCHANDRA M. GOHIL
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Abstract
The properties of melt blends of specific aliphatic-aromatic copolyesters and starch are improved by addition of a combination of polylactic acid, graft copolymers such maleic anhydride grafted polyethylene and maleic anhydride grafted polystyrene, and a hindered phenolic antioxidant. The blends exhibit increased melt strength and maximum draw down ratio versus blends of only aliphatic-aromatic copolyesters and starch. Films made from the blend are compostable and exhibit an attractive combination of mechanical and rheological properties for packaging materials.
Claims12
A composition comprising a melt blend of
- (a) 50 to 70 wt % copolyester made from monomers comprising 1,3-propanediol, terephthalic acid, and a linear aliphatic dicarboxylic acid, wherein the molar ratio of terephthalic acid to linear aliphatic acid is between 75:25 and 80:20;
- (b) 15 to 50 wt % starch;
- (c) 6 to 13 wt % polylactic acid;
- (d) 0.5 to 5.0 wt % graft copolymer of a polyolefin or a polystyrene;
- and
- (e) optionally 0.5 to 5.0 wt % hindered phenol antioxidant.
3 more elements
Dependencies are inferred from the claim text.