The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 08, 2000
Filed:
Nov. 15, 1996
Pasquale Relvini, Milan, IT;
Fabio Giberti, Milan, IT;
Atohaas Holdings C.V., , NL;
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.