Aqueous binders for granular and/or fibrous substrates

摘要

Aqueous binder for granular and/or fibrous substrates based on polyacids, polyols and basic nitrogen compounds.

主权项

1. An aqueous binder, consisting essentially of, as active constituents:
a) polymer A, comprising a polymer obtained by free-radical polymerization, wherein the polymer comprises, in polymerized form:≧5 and ≦100 wt %of monomer A1, α,β-monoethylenicallyunsaturated mono- or dicarboxylic acid and/oranhydride, and≧0 and ≦95 wt %of of monomer A2, comprising ethylenically unsaturated compound which is copolymerizable with the monomers A1, wherein a total amount of the monomers A1 and A2 is 100 wt %, b) polyol B, comprising a nitrogen-free polyol compound having at least two hydroxyl groups, and c) nitrogen base C, comprising a hydroxyl-free organic nitrogen compound having at least one pKB value ≦7, which is measured at 25° C. in deionized water and/or a hydroxyl-free imidazole compound; wherein the amount of nitrogen base C in the aqueous binder is ≧5 and ≦20 parts by weight, based on 100 parts by weight of polymer A and an equivalent ratio of carboxyl groups on the polymer A to hydroxyl groups on the polyol B is from 20:1 to 1:1.