Process for making thermoplastic polyester foams
US5348985A · kind A · utility
32Cited by
8References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 18, 1994 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Jan 18, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2367/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for making thermoplastic polyester foams comprises the steps of subjecting macrocyclic polyester oligomer precursors to initiators and blowing agents at a constant operating temperature in order to produce foams which unexpectedly display low foam densities.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.