Aqueous-liquid and blood-absorbing powdery reticulated polymers, process for producing the same and their use as absorbents in sanitary articles
First Claim
1. Powdery, water-insoluble, cross-linked polymerized resinous particles capable of absorbing aqueous or serous liquids or water, produced by polymerizing a composition comprising by weight(a) 55 to 99.9% of an unsaturated polymerizable monomer containing acid groups, at least 25 mol % of the acid groups being neutralized,(b) 0 to 40% of polymerizable unsaturated monomers other than (a),(c) 0.1 to 5% of a cross-linking agent, and(d) 0 to 30% of a water-soluble polymer, to form water-insoluble resinous particles, coating the particles with 0.1 to 5% their weight on an anhydrous basis of an alkylene carbonate, and heating the coated particles to a temperature of 150°
- to 300°
C.
5 Assignments
0 Petitions
Accused Products
Abstract
The present invention relates to a powdery, water-insoluble, cross-linked resin which absorbs aqueous or serous liquids as well as blood and is composed of a) 55 to 99.9%-wt. polymerized, unsaturated, polymerizable, acid-groups-containing monomers which are neutralized to the extent of at least 25 mol-%, b) 0 to 40%-wt. polymerized, unsaturated monomers copolymerizable with a), c) 0.1 to 5.0%-wt. of a cross-linking agent, and d) 0 to 30%-wt. of a water-soluble polymer, whereby the weight amounts a) to d) relate to anhydrous polymer. The polymer is characterized by the fact that the resin powder has been coated with 0.1 to 5%-wt. of an alkylene carbonate, relative to resin powder, and heated to a temperature of 150° to 300° C. The present invention further relates to a method of producing said polymer and to the use thereof in sanitary articles, such as diapers and the like, and in absorbent constructions consisting of hydrophilic fibers and absorbing resin.
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Citations
15 Claims
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1. Powdery, water-insoluble, cross-linked polymerized resinous particles capable of absorbing aqueous or serous liquids or water, produced by polymerizing a composition comprising by weight
(a) 55 to 99.9% of an unsaturated polymerizable monomer containing acid groups, at least 25 mol % of the acid groups being neutralized, (b) 0 to 40% of polymerizable unsaturated monomers other than (a), (c) 0.1 to 5% of a cross-linking agent, and (d) 0 to 30% of a water-soluble polymer, to form water-insoluble resinous particles, coating the particles with 0.1 to 5% their weight on an anhydrous basis of an alkylene carbonate, and heating the coated particles to a temperature of 150°
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12. A process for the preparation of powdery, water-insoluble, cross-linked polymerized resinous particles capable of absorbing aqueous or serous liquids or water, which comprises polymerizing a composition comprising by weight
(a) 55 to 99.9% of monomeric units of an unsaturated polymerizable monomer containing acid groups, at least 25 mol % of the acid groups being neutralized, (b) 0 to 40% of polymerizable unsaturated monomers other than (a), (c) 0.1 to 5% of a cross-linking agent, and (d) 0 to 30% of a water-soluble polymer, to form resinous particles, coating the particles with 0.1 to 5% their weight on an anhydrous basis of an alkylene carbonate, and heating the coated particles to a temperature of 150° - to 300°
C.
- to 300°
Specification
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- Resources
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Current AssigneeEvonik Stockhausen GmbH (Rag-Stiftung)
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Original AssigneeChemische Fabrik Stockhausen GmbH (Rag-Stiftung)
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InventorsDahmen, Kurt, Mertens, Richard
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Primary Examiner(s)REDDICK, MARIE L
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Application NumberUS07/966,047Time in Patent Office847 DaysField of Search524/52, 524/280, 524/729, 524/108, 525/329.7, 525/330.1, 525/383, 428/327, 428/407US Class Current428/327CPC Class CodesA61L 15/60 Liquid-swellable gel-formin...C08F 220/04 Acids; Metal salts or ammon...C08J 2300/10 Polymers characterised by t...C08J 2300/14 Water soluble or water swel...C08J 3/12 Powdering or granulatingC08L 33/02 Homopolymers or copolymers ...Y10T 428/254 Polymeric or resinous materialY10T 428/2998 including synthetic resin o...
