| 摘要 |
Process for the polymerization of acrylic monomers in aqueous suspension, wherein at least a comonomer has a solubility 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: <CHEM> 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 polymerization of an acrylic monomer, said mother waters containing an organic phase formed by the suspending agent and by other products formed during the polymerization, optionally 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 products above mentioned formed during the polymerization. |
