| 摘要 |
3, 4-epoxy cyclohexylmethyl-3, 4-epoxy cyclohexane carboxylates or alkyl-substituted derivatives thereof as claimed in Specification 768,157 are converted to heat-hardenable, resinous products by reacting them with a polycarboxylic acid anhydride in amount between 0,1-4,0 mols of anhydride per mol diepoxide. A poly carboxylic acid or ester thereof containing free carboxyl groups may be used in addition to the anhydride in an amount not greater than 1,0 mol per mol of diepoxide. Many suitable polycarboxylic acid anhydrides are mentioned. Lists are also given of the suitable polycarboxylic acids or esters which may be added. Reaction temperatures are from 50-250 DEG C. Gelation usually occurs after a period of 5 minutes to 5 hours, but may be hastened by addition in small quantities of accelerators, e.g. acetic acid, sulphuric acid, stannic chloride, perchloric acid, pyridine, aniline, benzyldimethylamine, benzyltrimethylammonium hydroxide or dilute sodium hydroxide. Curing may be at the same or a higher temperature. If desired the anhydride or acid may be dissolved to slow down its action to ensure formation of a homogeneous mass before gelling. Five examples illustrate the preparation of the diepoxides and 53 examples illustrate their curing with various anhydrides, e.g. maleic, phthalic, succinic, poly-adipic, dichloromaleic, tetrahydrophthalic, chlorendic and mixtures thereof, both with and without accelerators, and polycarboxylic acids or acid-terminated polyesters. Specification 852,410 also is referred to. Reference has been directed by the Comptroller to Specification 768,157. |
