Copolyester containing isophthalic acid, 1,4-cyclohexanedimethanol, 4,4'-biphenyldicarboxylic acid and an ultraviolet light absorbing compound and articles made therefrom
US6218450A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Apr 17, 2001 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/34
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.