Varnish composition with high glass transition temperature for glass fiber laminate
US8536283B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2011 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Jan 25, 2032 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D179/04
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A varnish composition includes (1) a benzoxazine resin having highly symmetric molecular structure; (2) at least one of naphthol novolac resins, aniline novolac resins and phenolic novolac resins; (3) fillers. The benzoxazine resin having highly symmetric molecular structure, and the at least one of naphthol novolac resins, aniline novolac resins and phenolic novolac resins contribute to increase the glass transition temperature of the varnish composition, while decrease the coefficient of thermal expansion and moisture absorbability due to their small and highly symmetric molecular structures. A copper substrate can meet the requirement of high glass transition temperature (TMA≧200° C.) and low coefficient of thermal expansion (α1/α≦30/135 (μm/m° C.). Therefore, the composition of the invention can be widely used as high-performance electronic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.