Process for preparing heat-resistant resins

Details Process for preparing heat-resistant resins Process for preparing heat-resistant resins

1983-09-01

1985-03-05

Kight, John

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

Synthetic resins

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

525366, 525367, 525369, 526283, C08F 812

Patent

active

045031940

ABSTRACT:
A polymer produced through ring opening of a 5-norbornene-2-carboxylate ester or a derivative thereof is dissolved in an organic solvent miscible with water and is subjected to hydrolysis by addition thereto of an alkali substance until at least a portion of the polymer is separated out. Then, water is added to the reaction mixture to dissolve the separated-out polymer, and the resulting solution is again subjected to hydrolysis treatment, which is followed by addition thereto of an acid to neutralize the resulting hydrolyzate. Thus, a polymer resin having excellent thermal resistance or a polymer resin of improved color shade or transparency can be obtained.

REFERENCES:
patent: 4412044 (1983-10-01), Takahashi et al.

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