Moisture-storing plastic padding for upholstery etc. - by prepn. of hydrophilic polymer gel in liq. medium or swelling a compact hydrophilic polymer, and removing the liq.

摘要

Prodn. of moisture-storing plastic padding (I) by (a1) prepn. of a hydrophilic polymer gel (IIA) in a liq. medium, or (a2) swelling a compact hydrophilic polymer (IIB) with a liq. medium to form a gel, followed by (b) removal of the liq.. Also claimed is material (I) obtd. by the above process. Pref. (IIB) is in the form of powder, granules, extrudate, strip or film, and is converted into a gel with superheated steam and then oven-dried (pref. at normal or reduced pressure and at a temp. between 100 deg C and the decompsn. pt. of IIB), or a liq. medium is used and then removed by freeze drying; (IIA/B) is a homo- or co-polymer, pref. a linear polymer, a short- or long-chain branched polymer, or a crosslinked polymer, esp. a covalently or physically crosslinked polymer; (IIA/B) contains anionic and/or nonionic hydrophilic gps. (X), pref. with 0-70 mol.% anionic gps. (AX) w.r.t. monomer units, esp. COO-, COOH, OH, CONH2 or SO3- gps.; degree of crosslinking is 0.5-20 mol.% w.r.t. monomer units; (II) is based on (meth)acrylic acid and/or metal salt, ester or amide thereof, and/or glucose; pref. (II) is polyacrylic acid or a copolymer of acrylic acid and 1-63 mol.% other comonomer, esp. with the acid gps. in partly dissociated form; (II) is a crosslinked polymer prepd. by direct reaction of monomer(s) and crosslinker(s) or from precursor polymer(s) (III) by radiation-induced crosslinking or reaction with crosslinkers; (III) is a linear polymer, a short- or long-chain branched polymer, or a graft copolymer or block copolymer. USE/ADVANTAGE - (I) is useful in upholstery, mattresses and incontinence prods. (claimed). The invention provides a moisture- storing plastic material with a large surface area and low apparent density. (0/0)