Compositions of polycondensed branched polyester polymers and aromatic polycarbonates, and the closed cell polymer foams made therefrom
US6214897A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1999 |
| Grant date | Apr 10, 2001 |
| Priority date | — |
| Expiry date | Nov 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2469/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A foamable polyester composition comprising a combination of blowing agent and mixed polymer composition comprising: a) a semi-crystalline polyester composition comprising a polycondensed branched polyester polymer, and b) an aromatic polycarbonate polymer. The foamable composition has a high extrusion melt strength, and can pulled across a die without ripping, to form a continuous thermoformable closed cell polyester sheet. The foamed sheets have a uniform, fine, and closed cell morphology; and simultaneously are less dense but have a higher impact strength than comparable closed cell polymers made in only with linear polyesters as the polyester component or without the aromatic polycarbonate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.