Process for producing highly reactive modified phenolic resin

Details Process for producing highly reactive modified phenolic resin Process for producing highly reactive modified phenolic resin

1995-01-24

1996-05-28

Clark, W. Robinson H.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525480, 528155, C08L 6104, C08L 5902, C08L 5904

Patent

active

055212590

ABSTRACT:
A process for producing a highly reactive modified phenolic resin, comprising the steps of polycondensing a petroleum heavy oil or pitch, a formaldehyde polymer and a phenol in the presence of an acid catalyst to thereby prepare a modified phenolic resin; and reacting the resultant modified phenolic resin with a phenol in the presence of an acid catalyst but in the absence of a crosslinking agent such as a formaldehyde polymer to thereby lower the molecular weight of the modified phenolic resin. This highly reactive modified phenolic resin has a low number average molecular weight and a high phenol content, so that its resin melt viscosity is low and that it exhibits a markedly improved reactivity with an epoxy resin. Accordingly, the combination thereof with an epoxy resin provides a molding material suitable for producing a molding which is excellent in not only thermal resistance and moldability but also dimensional stability and other mechanical properties, especially a material for electrical or electronic part and a semiconductor sealer.

REFERENCES:
Patent Abstracts of Japan, vol. 155, P-1562, JP-5-40646, Feb. 19, 1993.
PTO translation of Japan, Kokai 04-145116, pub. date: Apr. 19, 1992.
PTO translation of Japan, Kokai 02-274,714, pub. date: Nov. 8, 1990.

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