Patent ID: 7989545
Filing Date: 2011-08-02
Classification: C08F

Abstract:
1. A salt-sensitive binder polymer comprising: i) from about 10 to about 70 wt. percent of methacrylic acid units; ii) from about 10 to about 90 wt. percent of alkyl acrylate units having from 2 to 4 carbon atoms in the alkyl moiety; and iii) from about 2 to 55 wt. percent of hydrophobic monomer units selected from the group of alkyl (meth)acrylamides having from 4 to 12 carbon atoms in the alkyl moiety, straight chained or branched alkyl methacrylate units having from 4 to 6 carbon atoms in the alkyl moiety; bi-cycloalkyl (meth) acrylates with from 4 to 20 carbon atoms in the cycloalkyl moiety; and combinations thereof, wherein the binder polymer is neutralized such that it is water-soluble and wherein further the binder provides a characteristic wet strength index of less than 25 in deionized water and a characteristic wet strength index elevation of at least 15 points in a 10% aqueous solution of NaCl.