Heat-stable polyimide resins
US4039628A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1976 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | May 17, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
New heat-stable resins are provided having good mechanical and electrical properties combined with chemical inertness at temperatures of 200.degree. to 300.degree. C, which resins comprise three-dimensional recurring units of the general formula: ##STR1## in which, in any particular recurring unit: A IS ZERO OR AN INTEGER FROM 1 TO 5; ##STR2## denotes a radical of the general formula ##STR3## p1 in which Y represents H, CH.sub.3 or Cl; G denotes a monovalent aromatic radical; and PA1 A denotes a divalent organic radical possessing at least two carbon atoms, Such that there are on average, at least 4.4 and at most about ##STR4## radicals per ##STR5## radical, and optionally, units and/or molecules of the general formula ##STR6## IN WHICH: T denotes a monovalent organic radical; PA1 T.sub.1 denotes a radical of the general formula: ##STR7## or a radical of the general formula: ##STR8## b is zero or an integer from 1 to 4; AND A, D.sub.1 and G are as defined in claim 1; such that there are at most about 30 ##STR9## radicals per 100 ##STR10## radicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.