A water soluble polymer binder for binding a fibrous substrate comprises from about 25 weight percent to about 85 weight percent of an unsaturated carboxylic acid/unsaturated carboxylic acid ester terpolymer; from about 5 weight percent to about 35 weight percent of a divalent ion inhibitor; and from {HEAD ~ about 10 weight percent} to about 60 weight percent of {TAIL ~ a hydrophilic cross} linkable polymer 
A water soluble polymer binder for binding a fibrous substrate comprises from about 25 weight percent to about 85 weight percent of an unsaturated carboxylic acid / unsaturated carboxylic acid ester terpolymer ; from about 5 weight percent to about 35 weight percent of a divalent ion inhibitor ; and from { HEAD ~ about 10 weight percent } to about 60 weight percent of { TAIL ~ a hydrophilic cross } linkable polymer
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