Water absorptive composition
Patent 4300820 Issued on November 17, 1981. Estimated Expiration Date: 
October 27, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 27, 2000. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2658045 2901457 3159539 3511659 3700761 3728317 3803093 3807398 Manufacture of insoluble and only sparingly swellable poly-N-vinylpyrrolidone-2 or copolymers of N-vinylpyrrolidone with other N-vinyllactams Hydrophilic gel terpolymers from hydrophilic N-vinyl monomers, hydroxyalkyl acrylates or methacrylates and polymerizable unsaturated carboxylic acids InventorAssigneeApplicationNo. 06/201349 filed on 10/27/1980US Classes:424/78.06, Skin burn or open wound treatment351/160H, Hydrophilic523/108, Polymer of a heterocyclic N-vinyl polymerizable compound524/516, Solid polymer derived from nitrogen heterocycle monomer525/205, Heterocyclic reactant is an imide or lactam525/206Solid polymer derived from reactant containing a chalcogen atom (O, S, Se, Te) as part of a heterocyclic ringExaminersPrimary: Ziegler, J.International ClassesA61L 17/00 (20060101)A61L 15/16 (20060101) A61L 15/58 (20060101) A61L 17/14 (20060101) A61L 29/00 (20060101) A61L 29/08 (20060101) C01B 21/26 (20060101) C01B 21/00 (20060101) C08L 39/00 (20060101) A61L 29/14 (20060101) C08L 39/06 (20060101) C08L 39/04 (20060101) AbstractA composition capable of absorbing more than 45% of its weight of water without dissolution at room temperature to form a hydrogel is made by blending (1) 40 to 98% by weight of water-soluble polymer of a vinyl lactam having the structure ##STR1## in which X represents an alkylene bridge having three to five carbon atoms or a copolymer thereof with 1 to 90 mole percent of a copolymerizable monomer containing a polymerizable ethylenic unsaturation; and (2) 2 to 60% by weight of a water-insoluble copolymer formed of 50% to 90% by weight based on the total copolymer of a hydrophobic water-insoluble ethylenically unsaturated monomer, 2 to 12% by weight of an ethylenically unsaturated monomer containing an acid group, and 0 to 50% by weight of a hydrophilic ethylenically unsaturated monomer free from acidic groups.Other References
Field of SearchHeterocyclic reactant is an imide or lactam | |
