| 摘要 |
1,140,124. Epoxy resin compositions. DOW CHEMICAL CO. 29 March, 1966 [29 March, 1965], No. 13741/66. Heading C3B. Thermosettable epoxy resin compositions comprise (1) an epoxy resin, (2) 0À03-5À0 parts/hundred parts resin of a polyhydric polyether produced by reacting a mixture containing a polyepoxide of a polyhydric phenol and an alkylene glycol or polyglycol of 2 to 6 carbon atoms in the presence of a Lewis acid, the ratio of hydroxyl to epoxide groups in the mixture being 4: 3 to 15:1, the polyether having the general formula where: R<SP>1</SP> is -CH 2 -, -S-, -S 2 - or -SO 2 -; R<SP>2</SP> is an alkyle group containing 2-6 carbon atoms; m is an integer up to 10; and n is 1, 2 or 3. The polyether acts as a dispersant and anti-caking agent for solids insoluble in the epoxy resin. The preparation of polyethers from ethylene glycol and a diglycidyl ether of bisphenol A in the presence of BF 3 .Et 2 O and their use as dispersing agents for Al powder in an epoxy resin and as dispersing agents in epoxy resin paints are described. |
