Method for producing a resin rich epoxy prepreg and laminate
US4024305A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 4, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Jun 4, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2363/00
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for producing a resin rich epoxy-glass prepreg and laminate wherein the epoxy-glass prepreg is given a first pass through an impregnation tower and impregnated with dicyandiamide cured brominated bisphenol type epoxy modified with a polyfunctional additive and advanced to 80-85% of complete cure. The prepreg is given a second pass through the tower and given a dip coating of, for example, brominated bisphenol A which is advanced to 80-85% of complete cure. The resulting prepreg serves as the outer sheet of a multi-layer printed circuit board and it has a resin rich surface necessary for chemical roughening and subsequent additive plating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.