Patent Number: 6,310,155

Title: Process for preparing acrylic polymers in the presence of a radical initiator and a polymeric suspending agent

Abstract: Process for the polymerization in aqueous suspension of acrylic monomers in the presence of a polymeric suspending agent, homopolymer or copolymer 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, characterized in that the polymerization aqueous phase is wholly or partly formed by the mother waters obtained after the separation of the acrylic polymer, so as to have a polymerizable suspension containing at least 0.01% by weight and up to about 1% of said suspending agent and at least from 0.05% to 5% by weight of the other products above mentioned obtained during the polymerization.

Inventors: Relvini; Pasquale (Milan, IT), Giberti; Fabio (Milan, IT)

Assignee: Elf Atochem Italia S.r.l.

International Classification: C08F 2/20 (20060101); C08F 2/12 (20060101); C08F 20/00 (20060101); C08F 20/12 (20060101); C08F 002/20 ()

Expiration Date: 10/30/2018