The systematic development of water-soluble acrylic copolymers with significant shrink-resist effectiveness is described. Copolymers of 2-sulphoethylmethacrylate are readily soluble in water above pH 2. The incorporation of self-crosslinking monomers into the copolymer gives considerably better shrink-resist results than the use of external crosslinkers. Copolymers of glycidylmethacrylate, which are curable at or alove pH 7, are more effective than copolymers of N-methylolacrylamide, which are usually cured in the presence of strong acidic catalyst. The effect of the latter polymers can be considerably improved if the wool is either pretreated or saturated with the acidic catalyst before polymer application.
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