Copolyester containing isophthalic acid, 1,4-cyclohexanedimethanol and an ultraviolet light absorbing compound and articles made therefrom
US6368724B1 · kind B1 · utility
10Cited by
11References
23Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Apr 9, 2002 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A copolyester blend resistant to ultraviolet radiation includes a polyethylene terephthalate based copolyester having 1,4-cyclohexanedimethanol; an effective amount of an ultraviolet radiation absorber selected from the group consisting of benzoxazinones, dimeric benzotriazoles, triazines and mixtures thereof; and from 5 mol % to about 40 mol % isophthalic 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.