초록

The present invention relates to a multilayer polyester sheet comprising:

대표청구항 ▼

[ What is claimed is:] [1.] A multilayer polyester sheet comprising:a base layer comprising a thermoplastic polyester resin (A) having a glass transition temperature of not less than 80.degree. C., anda sealing layer comprising a thermoplastic polyester resin (B) having a glass transition temperatur

[ What is claimed is:] [1.] A multilayer polyester sheet comprising:a base layer comprising a thermoplastic polyester resin (A) having a glass transition temperature of not less than 80.degree. C., anda sealing layer comprising a thermoplastic polyester resin (B) having a glass transition temperature of not less than 70.degree. C. and laminated on at least one side of said base layer,wherein the glass transition temperature of thermoplastic polyester resin (B) is at least 5.degree. C. lower than the glass transition temperature of thermoplastic polyester resin (A),said polyester sheet being a substantially non-stretched transparent sheet in which the heat shrinkage at 180.degree. C. is not more than 5%, and further satisfying the following:(1) said thermoplastic polyester resin (A) comprising a dicarboxylic acid moiety comprising 7 to 100 mole % of a naphthalenedicarboxylic acid and 93 to 0 mole of terephthalic acid, and a diol moiety comprising ethylene glycol;(2) said thermoplastic polyester resin (B) comprising a dicarboxylic acid moiety comprising 4 to 90 mole % of naphthalenedicarboxylic acid and 96 to 10 mole % of terephthalic acid, and a diol moiety comprising 50 to 97 mole % of ethylene glycol and 50 to 3 mole % of at least one diol selected from the group consisting of cyclohexane dimethanol, diethylene glycol and 1,4-butanediol;(3) the haze of the whole multilayer polyester sheet is not more than 10%; and(4) the total thickness of the sealing layer is 1 to 30% of the thickness of the base layer.