Heat resistant poly(urethane amideimide) composition and method for preparing the same
US5310850A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1992 |
| Grant date | May 10, 1994 |
| Priority date | — |
| Expiry date | Oct 26, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01B3/303
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is a novel linear urethane-amide-imide copolymer composition obtained from first reacting X mols of diol compound, which had been dissolved in an inert organic solvent, with Y mols of diisocyanate compound at room temperature to produce an intermediate reaction product, followed by reacting the intermediate reaction product with Z mols of trimellitic anhydride at elevated temperatures, wherein Y is greater than X (i.e., the amount of diisocyante groups is in excess) and approximately equals the sum of X plus Z. The polyurethane copolymer composition obtained from this process contains urethane, amide and imide groups on the polymer backbone, exhibits excellent mechanical and electric properties and heat resistance, and does not suffer from the phase separation problems observed from polyurethane-polyamideimide blends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.