| 摘要 |
A process for the production of highly porous, hard, light-weight materials comprises reacting a polyisocyanate with a branched polyester and/or polyester amide, which polyester or polyester amide is modified with an unsaturated fatty acid and has terminal hydroxyl groups and if desired carboxyl groups and which contains incorporated therein by condensation a polyalkylene oxide, the reaction if desired being carried out in the presence of water, blowing agents or low-boiling solvents. Polyalkylene oxides include linear or branched compounds derived from propylene, phenoxypropylene and butylene-1,2 oxides, and additions product of such oxides with di- or polyhydric alcohols. Reactants for preparing the polyester are listed, including trimethylol propane monoallyl ether, pentaerythritol dibenzyl ether, 4,41-di(hydroxy-ethoxy)-diphenyl dimethyl methane, N-dihydroxyethyl aniline, N,N1-di(hydroxyethyl)-piperazine. Suitable unsaturated fatty acids are octadeca -9,11,13-triene -1-carboxylic acid, vicinenic acid and oleic acid. Foaming can be produced by water, azoisobutyric acid nitrile, azohexahydrobenzoic acid dinitrile, dinitrosopentamethylene tetramine, or solvents such as methylene chloride or trichlorofluoromethane or ethane. The specified polyester can be used in admixture with unmodified polyesters or polyethers. In a typical Example (2) a foam is prepared by reacting together a polyester from trimethylolpropane, adipic acid, phthalic acid, oleic acid and propoxylated trimethylolpropane, a polyester from adipic acid, butane -1,3-diol and hexanetriol, dimethylbenzylamine catalyst and an aqueous solution of the sodium salt of castor oil sulphonate. Specification 816,413 is referred to.ALSO:A process for the production of highly porous, hard, light-weight materials comprises reacting a polyisocyanate with a branched polyester and/or polyester amide, which polyester or polyesteramide is modified with an unsaturated fatty acid and has terminal hydroxyl groups and if desired carboxyl groups and which contains incorporated therein by condensation a polyalkylene oxide, the reaction if desired being carried out in the presence of water, blowing agents or low-boiling solvents. Polyalkylene oxides include linear or branched compounds derived from propylene, phenoxypropylene and butylene- 1, 2 oxides, and addition products of such oxides with di-or polyhydric alcohols. Reactants for preparing the polyester are listed, including trimethylol propane monoallyl ether, pentaerythritol dibenzyl ether, 4, 41 -di (hydroxyethoxy)-diphenyl dimethyl methane, N-dihydroxyethyl aniline, N, N1 -di (hydroxyl-ethyl)-piperazine. Suitable unsaturated fatty acids are octadeca-9, 11, 13-triene- 1- carboxylic acid, ricinenic acid and oleic acid. Foaming can be produced by water, azoisobutyric acid nitrile, azohexahydrobenzoic acid dinitrile, dinitrosopentamethylene tetramine, or solvents such as methylene chloride or trichlorofluoromethane or ethane. The specified polyester can be used in admixture with unmodified polyesters or polyethers. In a typical Example (2) a foam is prepared by reacting together a polyester from trimethylolpropane, adipic acid, phthalic acid oleic acid and propoxylated trimethylolproprane a polyester from adipic acid, butane- 1, 3-diol and hexanetriol, dimethylbenzylamine catalyst and an aqueous solution of the sodium salt of castor oil sulphonate. Specification 816,413 is referred to |
