Modified phenolic resin toughened by phenoxy resin

Details Modified phenolic resin toughened by phenoxy resin Modified phenolic resin toughened by phenoxy resin

1995-08-15

1996-09-24

Marquis, Melvyn I.

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

Synthetic resins

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

528154, C08G 5914

Patent

active

055591973

ABSTRACT:
A modified phenolic resin which is toughened by phenoxy resin is disclosed. The modified phenolic resin is prepared by the following steps: mixing a phenoxy resin having a weight average molecular weight of 10,000-1,000,000 and phenol in a weight ratio of phenoxy resin:phenol=1.5:1-1:1 at an elevated temperature to form a glutinous mixture; mixing the glutinous mixture and an acid catalyst to obtain a viscous mixture having a relatively low viscosity compared to the glutinous mixture; mixing the viscose mixture and a resole type phenolic resin to form a modified phenolic resin, wherein the resole type phenolic resin has a solid content of 60--75 wt. % and a free aldehyde content of 5-10 wt. %, the amount of the acid catalyst mixed is 2-10 wt. %, and the amount of the phenoxy resin mixed is 3-25 wt. % based on the resole type phenolic resin.

REFERENCES:
patent: 4157324 (1979-06-01), Culbertson
patent: 4182732 (1980-01-01), Fry
patent: 5087657 (1992-02-01), Qureshi et al.
Encyclopedia of Polymer Science & Engineering, vol. 6, p. 331.

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