Process in suspension for preparing acrylic polymers

Details Process in suspension for preparing acrylic polymers Process in suspension for preparing acrylic polymers

C - Chemistry, Metallurgy

08

F

C08F 2/20 (2006.01) C08F 20/12 (2006.01)

Patent

CA 2190332

Process for the polymerization of acrylic monomers in aqueous suspension, wherein at least a comonomer has a solu- bility in water of at least 5 g per 100 g of water, to obtain copolymers containing the hydrosoluble comonomer up to 60% by weight, in the presence of a radical initiator soluble in the monomer and of a polymeric suspending agent selected from the homopolymer of a compound of formula: R2 ¦ CH2 = C-CO-A-C-CH2-SO3M (I) ¦ ¦ R1 R3 wherein: R1 is H or CH3; R2 and R3, equal or different, are H or alkyls C1-C8, optionally branched when possible; M is an alkaline or alkaline-earth metal or ammonium and A is NH, O or NCH3, wherein the polymerization aqueous phase is wholly or partly formed by the mother waters obtained from a poly- merization of an acrylic monomer, said mother waters con- taining an organic phase formed by the suspending agent and by other products formed during the polymerization, optio- nally supplemented with a further amount of said suspending agent so as to obtain an aqueous phase containing 0.01-1% by weight of suspending agent and 0.05-5% by weight of the pro- ducts above mentioned formed during the polymerization.

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