Phenolic resins with improved low temperature processing stabili

Details Phenolic resins with improved low temperature processing stabili Phenolic resins with improved low temperature processing stabili

1979-12-28

1981-04-21

Pavelko, Thomas P.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425543, B29G 300

Patent

active

042632480

ABSTRACT:
Phenolic novolak resins are described which are structurally characterized as having from about 55% to about 90% of the available theoretical paraphenyl linkages in the resin chain bridged to a phenyl group. The resin compositions of this invention provide extended resin stability at relatively low temperatures without significant adverse affect on the cure speed at the molding temperature. The resins are especially suited for use in runnerless injection or cold manifold molding processes, but can also be used in transfer, compression and injection molding processes.

REFERENCES:
patent: 2464207 (1949-03-01), Bender
patent: 3390128 (1968-06-01), Hughes
patent: 3963652 (1976-06-01), Tanimura
patent: 3988386 (1976-10-01), Hesse

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