3v Inc.

Sigma Prodotti Chimici S.p.a.

Sigma Prodotti Chimici S.r.l.

Angelo Bresciani

A crosslinked acrylic acid polymer or crosslinked acrylic acid copolymer consisting of at least 80% of acrylic acid and containing less than 5 ppm of methylene chloride obtained by a process comprising the radicalic polymerization of monomers in a solvent mixture consisting of a mixture of methylene chloride and a carboxylic ester having formula

Crosslinked polyacrylic acids having low solvent residue, a process for

The preparation and use of water-soluble or water-swellable copolymers by polymerization in water-in-oil emulsions of an olephinically unsaturated acid, a salt thereof, a multifunctional monomer, acrylonitrile and optionally a monomer with hydrophilic functional groups.

Synthetic thickeners, obtained by water-in-oil emulsion polymerization,

The present invention relates to an acrylic acid synthetic polymer, said polymer being cross-linked, having high molecular weight and containing 56% to 68% by weight carboxy groups (--COOH), characterized in that it contains no more than 10 ppm solvent; and to a process for the preparation thereof.

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Bergamo, Italy

Angelo Bresciani