Polybutadiene and polyisoprene based thermosetting compositions and method of manufacture
US6291374A · kind A · utility
14Cited by
35References
35Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 21, 2000 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Mar 21, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T442/3455
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An electrical substrate material is presented comprising a resin matrix which includes a thermosetting polybutadiene or polyisoprene resin, an ethylene propylene rubber, and optionally a thermoplastic unsaturated butadiene- or isoprene-containing polymer; a particulate filler, a flame retardant additive, a curing agent, and a woven or unwoven fabric. The presence of the ethylene propylene rubber enhances the heat age properties of the substrate material, particularly the dielectric strength and the mechanical properties, while other electrical, chemical, and mechanical properties of the material are not adversely effected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.