Emulsion polymers
AssigneeBayer Aktiengesellschaft
InventorsJoachim Probst, Wolfgang Henning, Heinz Baumgen, Joachim Konig
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Abstract
Emulsion polymers obtained by emulsifying a monomer mixture of (A) 5-95% by weight of acrylonitrile, methacrylonitrile and/or substituted or unsubstituted styrene and (B) 5-95% by weight of acrylic and/or methacrylic acid esters containing 1-12 carbon atoms in the alcohol group, the sum of components (A)+(B) amounting to 100% by weight, in the presence of an aqueous solution or dispersion of a water soluble or water dispersible, cationically modified polyurethane, and subjecting the resulting emulsion to a radically initiated polymerization. The emulsion polymers are preferably used as paper sizes or in paper sizes together with conventional additives.
Claims9
Paper sizes consisting essentially of an emulsion polymer obtained by emulsifying a monomer mixture of
- (A) 5-95% by weight of acrylonitrile, methacrylonitrile and/or substituted or unsubstituted styrene and
- (B) 5-95% by weight of acrylic and/or methacrylic acid esters containing 1-12 carbon atoms in the alcohol group, the sum of components (A)+(B) amounting to 100% by weight, in the presence of an aqueous solution or dispersion of a cationically modified polyurethane, and subjecting the resulting emulsion to a radically initiated polymerization
- wherein
- the polymers are present in the form of colloid disperse solutions having average particle diameters of 15 to 200 mm.
Dependencies are inferred from the claim text.