| 摘要 |
A water-soluble polymer which is soluble in tap water, but insoluble in an aqueous solution containing 0.5% or more of a neutral inorganic salt, which is a copolymer of: (A) 30 to 75% by weight of acrylic acid, (B) 5 to 30% by weight of a vinyl monomer represented by the following general formula [1]: CH2=C(R)COOR1[1] wherein R represents a hydrogen atom or a methyl group; and R1 represents an alkyl group having 8 to 12 carbon atoms, and (C) 20 to 40% by weight of a vinyl monomer represented by the following general formula [2]: CH2=C(R2)COOR3[2] wherein R2 represents a hydrogen atom or a methyl group; and R3 represents an alkyl group having 2 to 4 carbon atoms and in which not more than 50 molar % of the repeating units of derived from the acrylic acid is in the form of a salt. When the polymer is used as a binder for a non-woven fabric or paper, it exhibits satisfactory strength and permeability to a body fluid when the resultant product is wet with body fluid.
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