Patent ID: 6130309
Filing Date: 2000-10-10
Classification: A61K,A61L,A61Q,C08G,Y10S

Abstract:
A hydrophilic polyether polyurethane polymer of improved strength, absorption and integrity comprising the reaction product of a mixture of:a long chain polyoxyalkylene diol, said polyoxyalkylene diol comprising one or more of a higher molecular weight polyoxyethylene diol having a number average molecular weight of about 6,000 to about 10,000 in an amount by weight in the reaction mixture of least about 55%, a polyoxypropylene having a number average molecular weight of about 400 to about 3,500 or lower molecular weight polyoxyethylene diol having a number average molecular weight of about 600 to about 2,000;a glycol selected from the group consisting of ethylene glycol, propylene glycol, 2-ethyl-1,3-hexanediol, tripropylene glycol, triethylene glycol, 2,-4-pentanediol, 2-methyl-1,3-propanediol, cyclohexanediol, cyclohexanedimethanol, 2-methyl-1,3-pentanediol, dipropylene glycol, diethylene glycol in an amount by weight of the reaction mixture of about 1.0% to about 5.0%;an organic diisocyanate;a 2,2-di-(hydroxymethyl) alkanoic acid in the amount comprising about 0.5% to about 2.7% by weight of the reaction mixture, the alkanoic acid is dimethylolpropionic acid; andwater in the amount comprising from about 0.10% to about 0.30% by weight of the reaction mixture,wherein the ratio of NCO to OH of the long chain polyoxyalkylene diol, the alkanoic acid, water and glycol being from about 0.75 to about 0.95, the weight average molecular weight of the reaction product is about 25,000 to about 55,000 and said polymer is soluble in a basic water solution.