Treating porous substrate with acrylate and crosslinking...

Details Treating porous substrate with acrylate and crosslinking... Treating porous substrate with acrylate and crosslinking...

C - Chemistry, Metallurgy

08

J

204/91.4, 204/91

C08J 7/18 (2006.01) A61L 15/60 (2006.01)

Patent

CA 1203502

ABSTRACT A moisture-swellable absorbent material is formed by the process which includes treating a substrate capable of forming graft polymers with an acrylate salt under the influence of high energy ionizing radiation with an aqueous monomer dispersion or solution of an acrylate salt selected from sodium acrylate, potassium acrylate, lithium acrylate, ammonium acrylate or mixtures thereof, and a water-dispersible cross-linking monomer in amounts from about 2% to 10% by weight of said acrylate salt in said aqueous dispersion or solution and having sufficient acrylate salt and cross-linking monomer to form a reaction product with said substrate in amounts from about 60 percent to 200 percent by weight of substrate. The thus treated substrate is irradiated with high energy ionizing radiation having an energy of at least about 150,000 electron volts at a dose rate up to about 90 megarads per second to provide a dosage from about 0.5 to 25 megarads to thereby form a graft polymer on the surface and an interpenetrating network within the substrate.

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