| 摘要 |
Substantially linear 1:2-epoxy resins of high molecular weight are made by reacting 1,2-epoxy resins having a molecular weight from about 250 to about 1,000 with a dihydric phenol in the presence of a lithium salt as catalyst. Specified starting materials are methyl-9:10:12:13-diepoxy stearate, the dimethyl ester of 6:7:10:11-diepoxyhexadecane-1:16-dicarboxylic acid, diethylene glycol bis(3:4 epoxy-cyclohexane carboxylate), 3:4-epoxy-6-methylcyclohexyl-methyl-3:4-epoxy-6-methyl cyclohexane carboxylate and 3:4-epoxycyclohexyl methyl-3:4-epoxycyclohexane carboxylate, diglycidyl adipate, diglycidyl phthalate and the reaction products of epichlorohydrin or dichlorohydrin with ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, butylene glycol, polyethylene glycols, polypropylene glycols, pentane-1:5-diol, hexane-1:6-diol, resorcinol, pyrocatechol, hydroquinone, 1:4-dihydroxynaphthalene, bis-4(hydroxyphenyl)-methane, bis-(4-hydroxy phenyl) methyl-phenyl-methane, bis-(4-hydroxyphenyl)-tolyl-methane, 4-41-dihydroxy-diphenyl, bis-(4-hydroxyphenyl)-sulphone and bis-phenol A. The phenols listed above are also employed in the process of the invention. Specified lithium salts are lithium carbonate, disodium lithium phosphate, lithium oxalate, lithium bis-phenolate and lithium chloride. In the Examples: (1) to (3) an epoxy resin made from bis-phenol-A and epichlorohydrin is reacted with bis-phenol A in the presence of lithium chloride, lithium dietate, lithium carbonate, lithium acetate and disodium lithium phosphate; (4) and (5) 3, 4-epoxy-6-methylcyclohexyl methyl 3, 4-epoxy-6-methyl cyclohexane carbonate is reacted in the presence of lithium chloride with (4) bis-phenol-A and (5) resorcinol; (6) an epoxy resin made from polypropylene glycol and epichlorohydrin is reacted with resorcinol in the presence of lithium chloride and (7) butane diol diglycidyl ether is reacted with bis-phenol-A in the presence of lithium chloride. The products of the invention may be cured by reaction with amines and polycarboxylic anhydrides. |
