Heat-stable polyimide resins from bis-imide and aldehyde-azine
US3998787A · kind A · utility
Inventor
Key dates
| Filing date | Feb 22, 1972 |
| Grant date | Dec 21, 1976 |
| Priority date | — |
| Expiry date | Feb 22, 1992 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31623
- 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## in which Y represents H, CH.sub.3 or Cl; G denotes a monovalent aromatic radical; and 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 20>D.sub.1 < radicals per ##STR4## radical, and optionally, units and/or molecules of the general formula ##STR5## in which: T denotes a monovalent organic radical; T.sub.1 denotes a radical of the general formula: ##STR6## or a radical of the general formula: ##STR7## 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 ##STR8## radicals per 100 ##STR9## radicals.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.