Amphiphilic and non-water soluble (meth)acrylic comb polymers

摘要

Non water-soluble polymers with a comb structure and a (meth)acrylic skeleton on which are grafted side chains containing at least one hydrophobic monomer of the styrene or (meth)acrylic ester type on C1 to C4, and at least one hydroxy or methoxy polylakylene glycol monomer. The levels of monomers are such that the polymer is amphiphilic because it is both rich in hydrophobic monomer and polylakylene glycol monomer. These products, used in paper coating dispersions, enable an increase in their Brookfield™ viscosity, a reduction in their ACAV viscosity, and an improvement in their water retention, which makes them particularly well suited for dry extract and/or high deposit speed coatings.

主权项

1. An aqueous dispersion, comprising:
water; and a polymer, which comprises a) from 30% to 60% of a hydroxy and/or methoxy polyalkylene glycol monomer of formula:
R—(EO)m—(PO)n—R′, wherein m and n are each independently integers less than or equal to 150, with the proviso that at least one of m and n is non-zero, EO and PO respectively are ethylene oxide and propylene oxide, R is a methacrylate or methacrylurethane function, R′ is hydrogen or methyl, b) from 20% to 60% of a hydrophobic monomer selected from the group consisting of styrene and (meth)acrylic esters having 1 to 4 carbon atoms in the ester group, c) from 0.1% to 10% of acrylic and/or methacrylic acid, d) from 0 to 5% of a monomer of formula:
R—(EO)m—(PO)n—R′, wherein m and n are each independently integers less than or equal to 150, with the proviso that at least one of m and n is non-zero, EO and PO respectively are ethylene oxide and propylene oxide, R is a methacrylate or methacrylurethane function, R′ is an alkyl or aryl or alkylaryl group with 8 to 32 carbon atoms, linear or branched, e) from 0 to 5% of a monomer with two ethylenic unsaturations, wherein the sum of the percentages a), b), c), d) and e) is 100%, and the polymer is not water soluble in the acid form.