Processability of intractable polymers
US3969430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 18, 1974 |
| Grant date | Jul 13, 1976 |
| Priority date | — |
| Expiry date | Nov 18, 1994 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S525/928
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Normally intractable high temperature resistant polymers which lack plastic flow characteristics, such as polymers of the BBB type [i.e., poly(bisbenzimidazobenzophenanthroline) and related nitrogenous polymers], are rendered capable of undergoing facile molding to form three-dimensional shaped articles. A minor proportion of a cross-linkable additive polymer exhibiting a recognizable glass transition temperature below its decomposition temperature (e.g., a polybenzimidazole) or precursors capable of forming the same is incorporated in substantially uniform physical admixture with the normally intractable polymer, the admixture shaped to form a three-dimensional article, and the resulting article is heated until the additive polymer is cross-linked and the thermal stability of the article is enhanced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.