C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
134/53, 400/6515
C08L 53/00 (2006.01) C08F 8/12 (2006.01) C08L 33/20 (2006.01)
Patent
CA 1086883
ABSTRACT OF THE DISCLOSURE: The invention relates to ionogenic hydrophilic water- insoluble gels from partially hydrolyzed polymers and copolymers of acrylonitrile and their method of manufacture, said gels being characterized by a two-phase structure in water-swelled condition, one phase consisting of crystalline or quasi-crystalline polyacry- lonitrile detectable by X-ray analysis, the other phase being high- ly hydrophilic, amorphous and containing a major portion of acrylic acid units and a minor portion of acrylamide units, the hydrogel containing also a minor portion of weakly basic nitrogeneous groups and from 0 to 5 % of crosslinks which are unstable in presence of bases but sufficiently stable in acid and neutral media, each po- lymer chain containing in average more than one block or sequence of acrylonitrile units and more than one hydrophilic segment of the above stated composition, thus taking part of more than one domain of each of the said two phases which are therefore insepa- rable from each other, the content of water at swelling equili- brium ranging from 5 to 98% by weight. The hydrogels of the in- vention are noted for their extraordinary strength, inertness in contact with living tissues, permeability for gases and solutes as well as for their electrochemical characteristics. They are therefore utilizable in surgery, in dentistry and in various fields of chemical technology.
240326
Ceskoslovenska Akademie Ved
Robic Robic & Associes/associates
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