Abstract:
Stabilized polyolefin molding materials comprising:- (1) a polyolefin; (2) a stabilizer; and optionally (3) one or more conventional other auxiliaries or additives and containing certain 4-(m,m''-ditert.-butyl-p-hydroxyphenyl)-butyl- (2) compounds as stabilizers. The polyolefins exhibit better stability than prior art stabilized polyolefins.
Abstract:
IN WHICH -X- is -O- and R1 is carbonylalkyl or carbonylaryl.
Suitable compounds for stabilizing polyamides against oxidation and thermal degradation are acid esters of 2,6-di-t-butylphenolbutanol of the general formula
Abstract:
Suitable compounds for stabilizing polyamides against oxidation and thermal degradation are acid amides, acid esters, bis-ureas and bis(acid amides) based on 2,6-di-t-butylphenol-butylamine and 2,6-di-t-butylphenol-butanol of the general formulae:
Abstract:
A process for separating, by distillation, a mixture consisting essentially of 3,3-dimethylacrolein and 3-methyl-3-buten-1-ol, wherein the mixture to be separated is distilled in the presence of water and glycerol, the 3,3-dimethyl-acrolein first being distilled off azeotropically with water and the 3-methyl-3-buten1-ol then being separated, as an azeotropic mixture with water, from the higher-boiling glycerol. It is also possible to isolate the 3,3-dimethylacrolein by distillation if the 3-methyl-3-buten1-ol is partially replaced by 3-methyl-2-buten-1-ol. The 3,3dimethylacrolein, which can be isolated in pure form by the process of the invention, is a valuable intermediate for the synthesis of natural substances such as citral, vitamin A and chrysanthemic acid.
Abstract:
of the disclosure: A process for the preparation of pourable choline chloride/silica powders by mixing silica with choline chloride and, where appropriate, drying this mixture, wherein spray-dried or fluidized beddried silica which has a particle size of from 30 to 250 .mu.m is mixed with an aqueous choline chloride solution which contains from 70 to 80% by weight, based on the solution, of choline chloride and is at from 40 to 80.degree.C, thereafter from 0.05 to 0.4% by weight, based on the mixture, of magnesium stearate or calcium stearate is added and, if appropriate the resulting mixture is dried.
Abstract:
A process for separating, by distillation, a mixture consisting essentially of 3,3-dimethylacrolein and 3-methyl-3-buten-1-ol, wherein the mixture to be separated is distilled in the presence of water and glycerol, the 3,3-dimethyl-acrolein first being distilled off azeotropically with water and the 3-methyl-3-buten-1-ol then being separated, as an azeotropic mixture with water, from the higher-boiling glycerol. It is also possible to isolate the 3,3-dimethylacrolein by distillation if the 3-methyl-3-buten-1-ol is partially replaced by 3-methyl-2-buten-1-ol. The 3,3-dimethylacrolein, which can be isolated in pure form by the process of the invention, is a valuable intermediate for the synthesis of natural substances such as citral, vitamin A and chrysanthemic acid.