Preparation of water-soluble highly branched cationic polymer powder

The title aq. polymer contg. pyrrolidinium chloride units is stirred with heating until a water content of <25% is reached, to provide a powder. The polymer is a binary copolymer of diallyldimethylammonium chloride (I) with methyltriallylammonium chloride (II), tetraallylammonium chloride, or methylenebisacrylamide. Thus, 400 mol 50% aq. I soln. was stirred at HO Deg with 2 mol % each ammonium peroxydisulfate and ammonium carbonate. After addn. of 1 mol % triethanolamine and 0.5 mol II, polymn. was continued. The copolymer was heated and stirred with water removal to give a powder with active substance content 70%. [on SciFinder (R)

Water-soluble quaternary polyammonium salts, process for their preparation and their use

The title polymers are prepd. by radical polymn. of unsatd. quaternary ammonium compds. with addn. of 0.1-3 mol% crosslinking monomers at 25-90% conversion. Stirring 180 g 50% aq. (CH2:CHCH2)2NMe2+Cl- (I) with 2 mol% (NH4)2S2O8 and 2 mol% (NH4)2CO3 at 18-22 Deg for 8 h and 60 Deg for 4 h with addn. of 1 mol% triethanolamine over 10 h and 1 mol% (CH2:CHCH2)3NMe+Cl- in 50 g 50% aq. I after 6 h gave a 97% conversion to a clear soln. of polymer with relative soln. viscosity 3.47 and branching no. 18/100 I units. Addn. of the crosslinking agent at the start of polymn. resulted in complete gelation. [on SciFinder (R)

Coagulation of rubber latexes

Coagulated SBR or nitrile rubber latexes with low salt contents, suitable for processing in belt or bar driers, are prepd. by adding mixts. of NaCl and quaternary ammonium polymers to the latexes. Thus, an 18%-solids nitrile rubber latex contg. 0.4 phr poly(dialkyldimethylammonium chloride) (I) requires 50 parts satd. NaCl soln. for complete coagulation of 100 parts latex, compared with 150 in the absence of I. [on SciFinder (R)