Patent application number | Description | Published |
20100173086 | Modification of Paper Coating Rheology - Thickener compositions for addition to paper coating compositions in order to obtain low high shear viscosity and good water retention are disclosed. The thickener compositions comprise an associative polymer with an associative monomer content below 10% by weight, based on the weight of the polymer, a weight average molecular weight below one million and an acid monomer content of at least 10% by weight, based on the weight of the polymer. | 07-08-2010 |
20120220707 | LOW MOLECULAR WEIGHT PHOSPHORUS-CONTAINING POLYACRYLIC ACIDS AND USE THEREOF AS DISPERSANTS - Aqueous solutions of acrylic acid polymers are prepared by polymerization of acrylic acid in a feed operation with a free-radical initiator in the presence of hypophosphite in water as solvent, by a process comprising (i) initially charging water and optionally one or more ethylenically unsaturated comonomers, (ii) continuously adding acrylic acid in acidic, unneutralized form, optionally one or more ethylenically unsaturated comonomers, aqueous free-radical initiator solution and aqueous hypophosphite solution, and (iii) adding a base to the aqueous solution on completion of the acrylic acid feed, wherein a comonomer content does not exceed 30% by weight and the aqueous hypophosphite solution is added during a total feed time made up of three consecutive feed time spans Δt | 08-30-2012 |
20140080957 | LOW MOLECULAR WEIGHT PHOSPHORUS-CONTAINING POLYACRYLIC ACIDS AND USE THEREOF AS DISPERSANTS - An aqueous solution of an acrylic acid polymer which contains bound phosphonite groups is provided. The acrylic acid polymer is prepared by a feed operation polymerization which results in the formation of phosphinite groups bound within the acrylic acid polymer chain. The dried acrylic acid polymer is also provided. Dispersions of inorganic pigments prepared in the presence of the acrylic acid polymer or the aqueous solution of the acrylic acid polymer are also provided. | 03-20-2014 |