Weakly anionic polymers, uses thereof

摘要

The present invention concerns weakly anionic polymers including their use in paper coatings, especially those intended for paper for inkjet printing. These additives provide the sought thickening function, while improving water retention very appreciably. The invention also concerns a method of manufacture of such coatings, together with the coatings obtained in this manner.

主权项

1. A method, comprising:
1) blending an aqueous suspension comprising mineral filler and a dispersing agent with a binder to produce a medium, 2) introducing into the medium at least one of an organic salt, a mineral salt, and a cationic compound, and 3) introducing into the medium a hydrosoluble polymer comprising, expressed as a % by weight based on the total weight of its monomers:
a) 5% to 40% of (meth)acrylic acid,b) 60% to 95% of a monomer of formula (I):
R-(EO)m-(PO)n-R′  (I) where R is a polymerizable group selected from the group consisting of methacrylate and methacrylurethane, EO and PO designate ethylene and propylene oxides respectively, m and n are independent integers, at least one of which is non-zero, and are between 0 and 100 inclusively, and R′ designates hydrogen or an alkyl group having 1 to 4 carbon atoms.