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 {TAIL ~ about 5 weight percent} to about 35 weight percent of a divalent ion inhibitor; and from about 10 weight percent to about 60 weight percent of {HEAD ~ 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 { TAIL ~ about 5 weight percent } to about 35 weight percent of a divalent ion inhibitor ; and from about 10 weight percent to about 60 weight percent of { HEAD ~ a hydrophilic cross } linkable polymer
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