Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-10-24
1998-03-31
Henderson, Christopher
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526 70, 526287, C08F 220
Patent
active
057339929
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.
REFERENCES:
patent: 2072904 (1937-03-01), Ries
patent: 3129207 (1964-04-01), James
patent: 4340702 (1982-07-01), Huddleston, Jr.
patent: 4469839 (1984-09-01), Maruhashi
patent: 5344901 (1994-09-01), Relvini
Giberti Fabio
Relvini Pasquale
ELF Atochem Italia S.r.l.
Henderson Christopher
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