Process for preparing relatively high molecular weight epoxy res

Details Process for preparing relatively high molecular weight epoxy res Process for preparing relatively high molecular weight epoxy res

1985-03-04

1985-12-10

Nielsen, Earl

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

Synthetic resins

From phenol, phenol ether, or inorganic phenolate

525507, 528 87, 549517, C08G 5906

Patent

active

045581169

ABSTRACT:
Epoxy resins low in aliphatic halogen are prepared by reacting a polyhydric phenol with an excess of an epihalohydrin in the presence of a secondary alcohol and an aqueous solution of an alkali metal hydroxide until from 45 to <70 percent of the phenolic hydroxyl groups have reacted; removing unreacted polyhydric phenol therefrom until less than 4% total phenolic hydroxyl remains in the reaction product; dehydrohalogenating the resultant intermediate product and recovering the epoxy resin therefrom.

REFERENCES:
patent: 2848435 (1958-08-01), Griffin et al.
patent: 3121727 (1964-02-01), Baliker, Jr. et al.
patent: 3325452 (1967-06-01), McWhorter et al.
patent: 4017523 (1977-04-01), Vargiu et al.
patent: 4132718 (1979-01-01), Vargiu et al.
patent: 4373073 (1983-02-01), Wojtech et al.

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