C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
18/1170, 400/510
C08L 63/02 (2006.01) A61K 6/08 (2006.01) B29C 39/00 (2006.01) B29C 39/38 (2006.01) B29C 39/40 (2006.01) C08G 59/38 (2006.01) C08G 59/42 (2006.01) C08L 63/10 (2006.01)
Patent
CA 1189222
ABSTRACT A method for making east precision epoxy resin bodies and an epoxy resin formula- tion for use therein, the epoxy resin formula- tion having Component A consisting essentially of from 40 to 70% by weight epoxy novolac polymer, from 30 to 50% by weight vinyl -3-cyclohexene di- epoxide and from 0 -to 20% by weight 3,4 epoxy cyclohexylmethyl -3,4-epoxy cyclohexane carboxy- late and Component B consisting essentially of partially hydrolyzed aryl tetracarboxylic acid dianhydride, preferably partially hydrolyzed pyromellitic acid dianhydride. In the prefer- red embodiments a tertiary amine catalyst is also included. These components are mixed, just before use, in a ratio of from 20 to 50 parts by weight Component B to each 100 parts by weight Component A. To make the cast precision bodies such mixture is cast in a mold of the shape desired, allowed to cure to a solid body while in the mold, and thereafter heated to cause permanent expansion thereof at least suf- ficient to compensate for any shrinkage occur- ring during the casting and hardening thereof while in the mold.
411817
Boduch Paul A.
Elverum John A.
Stephan James E.
Coors Porcelain Company
Smart & Biggar
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