Poly epoxy branched polycarbonate and method for preparation
US4959422A · kind A · utility
1Cited by
2References
20Claims
0Family size
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Key dates
| Filing date | Sep 15, 1989 |
| Grant date | Sep 25, 1990 |
| Priority date | — |
| Expiry date | Sep 15, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L63/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Branched polycarbonates are prepared by the reaction of at least one polyepoxy compound, preferably triglycidyl isocyanurate, with at least one carboxylic acid-terminated polycarbonate, preferably of the type prepared by employing t-butyl p-hydroxybenzoate as a chainstopper in an interfacial polycarbonate formation reaction followed by thermal elimination of isobutene. The branched polycarbonates have high melt viscosities and high complex viscosity ratios, and are particularly useful in such operations as blow molding.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.