Abstract:
PROBLEM TO BE SOLVED: To provide a preparation process of an aqueous secondary dispersion liquid for a water insoluble polymer without using a surfactant. SOLUTION: The preparation process of an aqueous secondary dispersion liquid for a water insoluble polymer is characterized by performing a free radical solution polymerization in a polymerization medium, either an organic/water miscible solvent or a mixture of water and an organic/water miscible solvent, of an ethylenic unsaturated monomer M containing (i) at least one kind of monoethylenic unsaturated monomer M1 with the water solubility of 30 g/l or less at 25°C and 1 bar and (ii) at least one kind of hydrophilic and monoethylenic unsaturated nonionic comonomer M2 with the water solubility of 80 g/l or less at 25°C and 1 bar, replacing the solvent with water, and adding some amount of the monomer M as a monomer composition M' consisting essentially of the monomer M2 before completing the polymerization. The water-soluble polymer dispersion liquid is also provided and the use of the above liquid especially in pharmacology and cosmetics is specified. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
The invention relates to the use of copolymers which comprise a) 60 to 99 % by weight of N-vinylcaprolactam; b) 1 to 40 % by weight of at least one monomer b) selected from the group including: b1) C8-C30 alkyl esters of monoethylenically unsaturated C3-C8 carboxylic acids; b2) N-alkyl- or N,N-dialkyl-substituted amides of the acrylic acid or the methacrylic acid with C8 to C30 alkyl groups; b3) the vinyl esters of aliphatically unbranched C8-C30 carboxylic acids; b4) the C8-C30 alkyl-vinyl ethers, as solubilizers for substances that are difficult to dissolve in water.
Abstract:
PCT No. PCT/EP96/03795 Sec. 371 Date Mar. 3, 1998 Sec. 102(e) Date Mar. 3, 1998 PCT Filed Aug. 29, 1996 PCT Pub. No. WO97/09359 PCT Pub. Date Mar. 13, 1997Porous polymers which are in powder form and contain N-vinylimidazole units and which are obtainable by free-radical precipitation polymerization of a) 5-100% by weight of at least one N-vinylimidazole of the formula where R1, R2 and R3 are identical or different and are H, C1-C4-alkyl, N-vinylaxazolidone, N-vinyltriazole, 4-vinylpyridine N-oxide or mixtures of said monomers, b) 0-95% by weight of other copolymerizable monoethylenically unsaturated monomers and c) 0-50% by weight of at least one monomer with at least two non-conjugated ethylenic double bonds in aqueous solution which contains 0.5-30% by weight of at least one electrolyte and, based on the monomers employed, 0.5-80% by weight of at least one surfactant, a process of the preparation thereof, and the use of the porous polymers.