Process for acrylic suspension polymerization with partially hydrosoluble comonomers
US6100355A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 1996 |
| Grant date | Aug 8, 2000 |
| Priority date | — |
| Expiry date | Nov 15, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F20/12
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.