Lidding structure based on aromatic polyester film, extrusion-coated with a sealable/peelable copolyester layer

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United States of America Patent

PATENT NO 9656447
APP PUB NO 20140065431A1
SERIAL NO

13601100

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A multi-layer sheet suitable as sealable or peelable sheet specially used for closing foodstuff containers. This multi-layer sheet comprises a polymeric substrate layer and a seal or a peel-seal layer. The multilayer composite film has at least two main component layers, namely in order, a polymeric substrate layer for mechanical strength and a heat-sealable layer applied by extrusion-coating, comprising a polyester of at least one aromatic dicarboxylic acid and at least one aliphatic dicarboxylic acid and at least one aliphatic diol. The polyester substrate layer comprises a crystallizable polyester base layer and an amorphous polyester sealable skin layer. The heat-sealable layer is slow-crystallizing with a glass transition temperature 50° F. or lower and melting point 250-320° F.

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Patent Owner(s)

  • TORAY PLASTICS (AMERICA), INC.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Sakellarides, Stefanos L East Greenwich, US 17 109

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