摘要:
The disclosure relates to a copolymer obtainable by radically initiated polymerization of the following: A) 70-99.9 wt. % an olefinically unsaturated C.sub.3 -C.sub.5 monocarboxylic acid, an olefinically unsaturated C.sub.4 -C.sub.8 dicarboxylic acid or its anhydride, or a mixture of such carboxylic acids; with B) 0.1-30 wt. % one or more multiply olefinically unsaturated carboxylic acid derivatives of formula (I)Z--Y--(CHR.sup.3 --CH.sub.2 --X).sub.n --R.sup.4 (I)in which Z is a vinyl or allyl group or structure (a), ##STR1## R.sup.1, R.sup.2 are hydrogen or methyl, R.sup.3 is hydrogen, methyl or ethyl, R.sup.4 is a singly or multiply olefinically unsaturated alkenyl or cycloalkenyl group or a singly or doubly olefinically unsaturated arylalkylene group, X is oxygen or NH, Y is oxygen, NH or N-alkyl, n is a number between 0 and 50; and C) 0-29.9 wt. % other copolymerizable monomers. The proposed copolymer can be used as a thickener or dispergent for aqueous systems.
摘要:
A process for stabilizing a copolymer of maleic acid or maleic anhydride and vinyl alkyl ethers against a reduction in molecular weight in aqueous solution or in the solution of an organic solvent by adding 0.001 to 10% by weight, based on the copolymer, of a reducing agent, a tert-butyl-containing phenol or a mixture thereof.
摘要:
A process for the preparation of low-hydrazine polymers based on basic vinyl monomers by free-radical solution polymerization in aqueous medium in the presence, as compound which forms free radicals, of an azo compound which has alkoxycarbonyl groups on the carbon atoms adjacent to the azo group.
摘要:
A process for the production of solid pharmaceutical depot forms by application of a reconstituted aqueous dispersion of a pharmaceutically acceptable binder to a core which contains active substance or by wet granulation of the pharmaceutical active substance with such a binder dispersion or by direct tableting of an active substance with the redispersible binder powder, wherein the binder has been obtained by emulsion polymerization and subsequent spray drying of the resulting aqueous dispersion with a water-soluble pharmaceutically acceptable spraying aid with a glass transition temperature of at least 60.degree. C. and with or without a pharmaceutically acceptable antiblocking agent.
摘要:
Hair setting composition containing as film formers copolymers based on tert-butyl acrylate and/or tert-butyl methacrylate, having a K value of from 10 to 50 and obtainable by free radical polymerization ofA) from 75 to 99% by weight of tert-butyl acrylate and/or tert-butyl methacrylate,B) from 1 to 25% by weight of acrylic acid and/or methacrylic acid andC) from 0 to 10% by weight of a further free radical copolymerizable monomer,the carboxyl groups of the copolymers having been partly or wholly neutralized by amines.
摘要:
A mixture of one or more pharmaceutical active compounds and one or more thermoplastic polymers is tabletted by a process in which the mixture is extruded and the still moldable extrudate is pressed to give tablets, between two belts, or a belt and a roller, which make contact in parts, rotate in opposite directions and run parallel along the contact zone, the shape-imparting indentations, which may be present in complementary pairs, being located in both or in only one of the revolving shape-imparting elements.
摘要:
Vinylpyrrolidone is removed from its polymers by a process in which an aqueous or alcoholic solution of the polymer is treated with an adsorbent, the adsorbents used preferably being active carbon, zeolites and especially acidic ion exchangers.
摘要:
A membrane of substantially non-crosslinked organic polymers which contain ionogenic groups bonded to the polymer chain via an alkylene radical, at intervals of not less than 4 carbon atoms.
摘要:
A membrane of a substantially non-crosslinked organic polymer which contains complex-forming groups bonded to the polymer chain via an alkylene radical, at intervals of not less than 4 carbon atoms.
摘要:
A process for the preparation of an enzymatically active formulation embedded in silica gel, wherein an aqueous mixture of an enzymatically active formulation and a dissolved alkali metal silicate and/or ammonium silicate is suspended in an organic, water-immiscible fluid and then converted to a water-insoluble gel.