Absorbent compsn. contg. water soluble or swellable polysaccharide deriv. - includes small amt. of water swellable synthetic polymer, soft matrix, crosslinker, reactive additive and antiblocking agent, prepn., useful in packaging, hygiene prods., etc.

摘要

The polymer compsn. contains (A) 70-99.99 wt.percent of a water-sol. or -swellable polymer based on polysaccharides and derivs. opt. modified by ionic and/or covalent crosslinking, (B) 30-0.01 percent of a water-swellable synthetic (co)polymer based on (meth)acrylic acid, (meth)-acrylonitrile, (meth)acrylamide, vinyl acetate, vinyl pyrrolidone, vinylpyridine, maleic acid or anhydride, itaconic acid or anhydride, fumaric acid, vinyl sulphonic acid and/or 2-acrylamido-2-methylpropane sulphonic acid, and the amides, N-alkyl or N,N'-dialkyl derivs. and esters contg. OH or amino gps. of these polymerisable acids, where up tp 98 percent of the acid gps. have been neutralised, and where the (co)polymers have been crosslinked by an at least bifunctional cpd., (C) 0.1-30 wt.percent, w.r.t. (A)+(B), of a matrix material with p.pt. or softening point below 180 deg.C, to prevent de-mixing and gel blocking, (D) 0.001-10 wt., w.r.t. (A)+(B) or an ionic or covalent crosslinker, (E) 01.50 percent, w.r.t. (A)+(B), of a reactive additive to improve absorption capacity and rate, and (F) 0-50 percent, w.r.t. (A)+(B), of an anti-blocking agent based on natural or synthetic fibres or materials with a large surface. USE/ADVANTAGE - The compsn. is used as fibres, films, powder or granulate for absorption of aq. solns. and dispersions and or body fluids, e.g. urine or blood, in technical prods. e.g. packing materials, in culture vessels, for soil improvement, as cable jackets, in hygienic prods., e.g. tampons and baby's napkins and in animal hygiene prods. It is used in powder form or as a dispersion in hydrophobic media, opt. with dispersion stabilisers or in admixture with other substances. (Animal) hygiene prods. and technical prods. contg,. the compsn. are claimed, as are slow release materials contg. active substances. The compsn. is based largely on renewable materials, is mainly biodegradable, and contains only small amts. of residual acrylate monomer. It has high and rapid absorption of water and aq. solns., shows no gel blocking or de-mixing, has high mechanical strength, and does not separate into single components on sieving or in a screw conveyor.