Batchwise copolymerization technique

摘要: A batch process for the preparation of swellable cross-linked copolymers mono-ethylenically unsaturated compounds with from 0.01 to 2.0% by weight a polyethylenically compound comprises reacting monomers in presence polymerisation catalyst and medium consisting at least 1/2 molar aqueous solution salt an inorganic acid which is represented one following formul : M++A-; M++A2-; M2+A-, where M++ cation metal Group I Periodic Table exception copper gold, A- anion derived exhibiting basicity 2, monobasic acid. Monoethylenically listed include acrylic methacrylic, fumaric maleic, acids, salts derivatives thereof, styrene substituted styrenes, vinyl ketones, esters heterocyclic among others, poly-unsaturated also butadiene, isoprene higher dienes, divinyl benzene diallyl derivatives. Catalysts benzoyl, acetyl di-t-butyl peroxides, 2,21-azobisisobutyronitrile, potassium persulphate, cumene hydroperoxide, tetraphenyl- tetra-p-methoxyphenyl succinodinitrile, mentioned are those barium, beryllium, cadmium, calcium, magnesium, strontium, zinc, sodium potassium. Conventional suspending agents protective colloids may be used reaction temperature room reflux product bead form. Examples describe use magnesium sulphate, beryllium calcium chlorides, secondary phosphate formation benzene, 3,4-dihydroxy2,5 - dimethyl 1,5 hexadiene, 4,6 dihydroxy-4,6 1,8 nonadiene, 2,4,6,8 tetramethyl dihydroxy 1,1,3,3, tetra-allyl 1,3 dihydroxypropane, p-diisopropenylbenzene; methacrylic ethyl acrylate, acrylamide, methylenediethylmalonate, styrene, 2-methyl-5-vinylpyridine, N-vinyl pyrrolidone, phthalimide, N.N-dimethylacrylamide, 2 pyride benzene; mixtures diethyl fumarate acrylamide acid, methylene malonate or acrylate benzene. The resin products as pharmaceuticals intermediates. Specifications 707,647 714,750 referred to.