Polybutadiene-epoxy-anhydride laminating resins
US4894413A · kind A · utility
4Cited by
3References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1987 |
| Grant date | Jan 16, 1990 |
| Priority date | — |
| Expiry date | Oct 9, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K1/0326
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improvement in the method for preparing resin compositions for use as a laminate material in printed wiring boards wherein the resin composition is formed by mixing an epoxy-anhydride prepolymer with maleated polybutadiene and a suitable solvent. The improvement involves preparing the epoxy-anhydride prepolymer using a two step procedure instead of a single step. The two step procedure prevents uncontrolled exothermic reactions from occurring during preparation of commercial quantities of the epoxy-anhydride prepolymer and increases the versatility of the process since different anhydrides can be used in each of the two steps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.