Copolyester containing 4,4'-biphenyldicarboxylic acid, 1,4-cyclohexanedimethanol and an ultraviolet light absorbing compound and articles made therefrom
AssigneeEastman Kodak Company
InventorDavid Richard Fagerburg
Life of this patent
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Abstract
A copolyester blend resistant to ultraviolet radiation consists essentially of 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; and from about 2 to about 25 mole percent of 4,4′-biphenyldicarboxylic acid residues present in the copolyester wherein the mole percent is based on 100 mole percent of dicarboxylic acid or equivalents. The copolyester blend is useful in making UV radiation resistant thermoformed articles.
Claims19
A copolyester blend resistant to ultraviolet radiation consisting essentially of:
- a. a polyethylene terephthalate based copolyester having 15 mol % to about 40 mol % 1,4-cyclohexanedimethanol residues wherein said mol % is based on 100 mole percent of diol or diol equivalents;
- b. an effective amount of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines and mixtures thereof;
- and
- c. from 5 to about 20 mole percent of 4,4′-biphenyldicarboxylic acid residues present in said copolyester wherein said mole percent is based on 100 mole percent of dicarboxylic acid or equivalents.
A thermoplastic article comprising:
- a. a first layer comprising a thermoformable polymeric material;
- and
- b. a second layer consisting essentially of:
- i. a polyethylene terephthalate based copolyester blend having from 15 mol % to about 40 mol % 1,4-cyclohexanedimethanol residues, wherein said mol % is based on 100 mole percent of diol or diol equivalents,
- ii. from about 0.1 weight % to about 10 weight % of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines and mixtures thereof;
- and
- iii. from 5 to about 20 mole percent of 4,4′-biphenyldicarboxylic acid residues present in said copolyester wherein said mole percent is based on 100 mole percent of dicarboxylic acid or equivalents.
A method for protecting a polyester sheeting material from UV radiation comprising applying to at least one surface of said sheeting material a layer resistant to ultraviolet radiation consisting essentially of:
- a. a polyethylene terephthalate based copolyester blend having from 15 mol % to about 40 mol % 1,4-cyclohexanedimethanol residues, wherein said mol % is based on 100 mole percent of diol or diol equivalents,
- b. from about 0.1 weight % to about 10 weight % of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines and mixtures thereof;
- and
- c. from 5 to about 20 mole percent of 4,4′-biphenyldicarboxylic acid residues present in said copolyester wherein said mole percent is based on 100 mole percent of dicarboxylic acid or equivalents.
Dependencies are inferred from the claim text.