초록 ▼

A copolyester blend resistant to ultraviolet radiation includes a polyethylene terephthalate based copolyester having 1,4-cyclohexanedimethanol residues; an effective amount of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines a

A copolyester blend resistant to ultraviolet radiation includes a polyethylene terephthalate based copolyester having 1,4-cyclohexanedimethanol residues; an effective amount of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines and mixtures thereof; from about 5 mol % to about 40 mol % isophthalic acid residues in the copolyester, and from 5 mol % to 20 mol % 4,4'-biphenyldicarboxylic acid residues present in the copolyester, wherein the mole percent of the diacid is based on 100 mole percent of dicarboxylic acid or equivalents. The copolyester blend is useful in making UV radiation resistant thermoformed articles.

대표청구항 ▼

[ What is claimed is:] [1.]1. A copolyester blend resistant to ultraviolet radiation comprising:a. a polyethylene terephthalate based copolyester having 1,4-cyclohexanedimethanol residues;b. an effective amount of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones

[ What is claimed is:] [1.]1. A copolyester blend resistant to ultraviolet radiation comprising:a. a polyethylene terephthalate based copolyester having 1,4-cyclohexanedimethanol residues;b. an effective amount of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines and mixtures thereof;c. from about 5 mol % to about 40 mol % of isophthalic acid residues in said copolyester; andd. from about 5 mol % to about 20 mol % of 4,4'-biphenyldicarboxylic acid residues present in said copolyester wherein said mole percents of said isophthalic acid residues and 4,4'-biphenyldicarboxylic acid residues are based on 100 mole percent of the dicarboxylic acid residues or equivalents thereof.