Paper sizing with latex dispersions of copolymers of hydrophobic monomers and low molecular weight styrene-maleic anhydride polymers

摘要

Application of latex-dispersions as treatment for making paper adhesive is claimed. Latex-dispersions claimed are those resulting from polymerisation of mixture of hydrophobic monomers, composed of emulsion of styrene and (meth)acrylic esters in aqueous solution of amphiphilic water-soluble or water-dispersible copolymer comprising a combination of hydrophobic monomers and hydrophilic monomers with carboxylic acid groups, in presence of radical initiator; said amphiphilic copolymer having molecular mass = 500-5000. Preferably copolymer comprises one or more hydrophobic monomers and one or more hydrophilic monomers selected from (meth)acrylic acid and maleic anhydride partially modified by alcohol or amine groups. Hydrophobic monomer is selected from styrene and derivatives, (meth)acrylic esters comprising fluoroesters resulting from esterification of (meth)acrylic acid by perfluoroalcohol, or a mixture of said monomers. Claimed copolymer is copolymer of styrene and maleic anhydride optionally modified by alcohol or amine with acidity index = 150-500. Paper is produced from (recycled) pulp.