초록 ▼

The present invention relates generally to multi-layer film compositions which can be thermoformed and heat set into clear, transparent articles, having excellent barrier properties. The compositions comprise at least one barrier layer and at least one polyester layer, whereby the polyester layer wi

The present invention relates generally to multi-layer film compositions which can be thermoformed and heat set into clear, transparent articles, having excellent barrier properties. The compositions comprise at least one barrier layer and at least one polyester layer, whereby the polyester layer will quickly crystallize and heat set into an optically clear layer material.

대표청구항 ▼

[ We claim:] [1.] A multi-layer composition comprising:a) a barrier layer; andb) a structural layer comprising:i) about 79 to about 99 weight parts thermoplastic crystallizable or crystalline polyester base resin having a glass transition temperature ("Tg") of at least about 50.degree. C., and a mel

[ We claim:] [1.] A multi-layer composition comprising:a) a barrier layer; andb) a structural layer comprising:i) about 79 to about 99 weight parts thermoplastic crystallizable or crystalline polyester base resin having a glass transition temperature ("Tg") of at least about 50.degree. C., and a melting point of at least about 150.degree. C. and an intrinsic viscosity (IV) of at least about 0.5; andii) an alkali metal salt of a polyester polymer in an amount sufficient to provide the structural layer with about 6.5.times.10.sup.-7 gram-atoms to about 15.times.10.sup.-6 gram-atoms of active alkali metal per gram of polyester defined in i).