Process for acrylic suspension polymerization with partially hyd

Details Process for acrylic suspension polymerization with partially hyd Process for acrylic suspension polymerization with partially hyd

1996-11-15

2000-08-08

Henderson, Christopher

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C08F 220

Patent

active

061003557

ABSTRACT:
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 weigh, 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: ##STR1## wherein: R.sub.1 is H or CH.sub.3 ; R.sub.2 and R.sub.3, equal or different, are H or alkyls C.sub.1 -C.sub.8, optionally branched when possible; M is an alkaline or alkaline-earth metal or ammonium and A is NH, O or NCH.sub.3, 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.

REFERENCES:
patent: 5344901 (1994-09-01), Relvini
patent: 5733992 (1998-03-01), Relvini
European Search Report dated Jan. 23, 1997.

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