| 摘要 |
Hardened resins are prepared by heating a mixture of (a) a compound containing at least two epoxide groups per molecule, (b) a meltable carbonate or polycarbonate of an organic polyhydroxy compound, said carbonate or polycarbonate being solid at room temperature and having terminal hydroxy groups, and (c) a hardener for (a). In a modification (a) is first reacted with (b) before being mixed with (c). Lists of suitable polyepoxides (a) are given, bisphenol A/epichlorhydrin and 2,2-(dicyclohex-3-enyl)-propane dioxide being used in the examples. Long lists of suitable polyhydroxy compounds for (b) are also given. Conventional anhydride hardeners (c) are listed, and the following hardeners are used in the examples:-the Na salt of bisphenol A, benzidine, and mixtures of phthalic anhydride with tributylamine, dimethyl cyclohexylamine and N-methyl decahydroquinoline. Optionable additives mentioned are glass fibres, asbestos, glass powder, soot and graphite. Carbonate preparation. In Examples (1), (4) and (6) carbonates are prepared from varying proportions of bisphenol A and diphenyl carbonate in the presence of the Na salt of bisphenol A. In (8) from diphenyl carbonate and 1,1,1-(4,41,411-trihydroxy triphenyl) ethane. In (10) from diphenyl carbonate and hexane-1,6-diol in the presence of NaOH.ALSO:Meltable carbonates or polycarbonates of organic polyhydroxy compounds, which are solid at room temperature, and have terminal hydroxyl groups are mixed with polyepoxides (see Group IV(a)). In Examples (1), (4) and (6) carbonates are prepared from varying proportions of bisphenol A and diphenyl carbonate in the presence of the Na salt of bisphenol A; in (8) from diphenyl carbonate and 1,1,1 - (4,41,411-trihydroxytriphenyl)ethane; and in Example (10) from diphenyl carbonate and hexane-1,6-diol in the presence of NaOH. |
