Method for polymerizing macrocyclic poly(alkylene dicarboxylate) oligomers
US5591800A · kind A · utility
37Cited by
8References
12Claims
0Family size
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Key dates
| Filing date | Nov 30, 1995 |
| Grant date | Jan 7, 1997 |
| Priority date | — |
| Expiry date | Nov 30, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F7/003
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Macrocyclic polyester oligomers are converted to linear polyesters by contact at a temperature of about 160.degree.-300.degree. C. with a cyclic titanium catalyst such as di-(1-butyl)-2,2-dimethylpropane-1,3-dioxytitanate, bis(2,2-dimethyl-1,3-propylene) titanate or 1-(1-butoxy)-4-methyl-2,6,7-trioxa-1-titanabicyclo[2.2.2]octane. Such catalysts have high activity and produce linear or branched polyesters of very high molecular weight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.