Hydroxy polyalkylene glycol function (meth) acrylic comb polymers, their use as shear-thinning agents in coating dispersions and dispersions containing them

摘要

Comb polymers useful in paper coating dispersions.

主权项

1. A coating dispersion, comprising:
a binder, a mineral substance, a comb polymer, and water; wherein the comb polymer comprises, expressed as molar percentages of its pre-polymerized constituents: a) 60% to 90% acrylic and/or methacrylic acid, and b) 10% to 40% of a monomer of the formula:
R—(EO)m—(PO)n—R′ where: wherein m =30 and n =70, EO and PO respectively designate ethylene oxide and propylene oxide, R designates a methacrylate function, R′ designates a hydroxy group, and wherein the coating dispersion comprises the binder, the mineral substance and the water in the following amounts: (a) from 3 parts to 20 parts by dry weight of the binder per 100 parts by dry weight of the mineral substance; (b) from 0.1 parts to 2 parts by dry weight of the comb polymer per 100 parts by dry weight of the mineral substance; and (c) water in a quantity by weight of 20%-80% in relation to the total weight of the coating dispersion, wherein the total amount of the acrylic acid and methacrylic acid in the comb polymer is 85 mol %.