Powder-form polymers which absorb, even under pressure,...

Details Powder-form polymers which absorb, even under pressure,... Powder-form polymers which absorb, even under pressure,...

C - Chemistry, Metallurgy

08

F

C08F 220/04 (2006.01) A61L 15/60 (2006.01) C08F 8/44 (2006.01) C08J 3/12 (2006.01)

Patent

CA 2152783

The invention concerns powder-form cross-linked polymers which absorb aqueous liquids and blood (so-called superabsorbers) comprising (a) 55-99.9 % by wt. of polymerized unsaturated polymerizable monomers containing acid groups at least 25 mol % of which have been neutralized; (b) 0-40 % by wt. of polymerized unsaturated monomers which can be copolymerized with (a); (c) 0.1-5.0 % by wt. of a cross-linking agent and (d) 0-30 % by wt. of a water-soluble polymer, the proportions by weight of (a) to (d) being expressed relative to the water-free polymer. These cross-linked polymers are produced by mixing 100 parts of the particulate polymers with an aqueous solution of, at the most, 10 parts of an at least 10 % phosphoric acid solution and (a) 0.05-0.3 parts of a compound which can react with at lease two carboxyl groups and has no groups in the molecule which form alkali-metal salts and/or (b) 0.05-1.0 parts of a compound which can react with at least two carboxyl groups and contains a group in the molecule which can from an alkali-metal salt, and the reaction mixture is heated to 150-250°C. The superabsorbers proposed have high liquid-retention capacity, high gel strength and high absorptive power even under pressure and can be produced without using an organic solvent and with only small amounts of agent for the surface treatment of the powder-form polymer. The invention also concerns the use of such polymers in textile articles designed to absorb body fluids, these articles consisting preferably of 2-80 % by wt. of superabsorber, the remaining percentage consisting of hydropholic fibres.

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