Hyperbranched polybenzazoles via an A3+ B2 polymerization
US7790831B1 · kind B1 · utility
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Key dates
| Filing date | Jun 15, 2006 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Aug 24, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In accordance with the present invention there are provided hyperbranched benzobisazole polymers having repeating units of the formulas:and hyperbranched bibenzazole polymers having repeating units of the formulas:wherein Q is —S— or —NH—; the terminal groups X and Y are COOH andrespectively, with their total number (X+Y) equals n+1, where n=degree of polymerization. The ratio X:Y can be controlled by varying the stoichiometric ratio of trimesic acid (A3 monomer) and 2,5-diamino-1,4-dimercaptobenzene dihydrochloride (B2 monomer) from 1:1 to 1.1.35.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.