Copolyesterimides derived from N,N′-bis-(hydroxyalkyl)-benzophenone-3,3′,4,4′-tetracarboxylic diimide and films made therefrom
US10377862B2 · kind B2 · utility
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19Claims
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Key dates
| Filing date | Nov 14, 2017 |
| Grant date | Aug 13, 2019 |
| Priority date | — |
| Expiry date | Nov 14, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2379/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A copolyester includes repeating units derived from an aliphatic glycol, terephthalic acid, and the monomer of formula (I): wherein n=2, 3 or 4; Z is C═O; comonomer (I) constitutes a proportion of the glycol fraction of the copolyester and is present in a range of from about 5 to about 15 mol % of the glycol fraction of the copolyester; wherein said copolyester is semi-crystalline. A process tor making the copolyester includes annealing a copolyester of formula (I) at 20-80° C. below the crystalline melting point (Tm) and above the glass transition temperature (Tg).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.