Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1995-06-02
1998-01-06
Gorgos, Kathryn L.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
524916, C07C 100, C07C 200, C07C 400, C07C 500
Patent
active
057057800
ABSTRACT:
A method of dehydration of bulky hydrogel samples of polyvinyl alcohol (i.e., PVA) and a method of preparation of prosthetic nuclei for vertebral discs are given. A method of gamma irradiation sterilization of PVA gel samples which does not incur the side effects of discoloration and of increased crystallinity (i.e., further reduction of water content) is also given.
A method of dehydrating bulky hydrogel samples of polyvinyl alcohol (i.e., PVA) so that no significant distortion in the samples results, comprises:
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Crystallization Of Polyvinyl Alcohol-Water Films by Slow Dehydration, National Technical University of Athens, Department of Chemical Engineering, Athens, Greece; Dec. 4, 1975.
Volume change by solvent and temperature of poly (vinly alcohol) crosslinked by electron irradiation; 1993 Huthig & Wepf Verlag, Basel.
Effect of Gamma Irradiation on Thermal Properties of Poly (Vinyl Alcohol) Solutions; Journal of Applied Polymer Science, vol. 43, 1393-1395 (1991).
Structure and mechanical properties of poly (vinyl alcohol) gel swollen by various solvents; Polymer, 1992, vol. 33, No. 11.
Crystallization in Films of Polar Vinyl Polymers-I., European Polymer Journal, 1968, vol. 4, pp. 685-693.
Swelling and mechanical properties of polyvinylalcohol hydrogels; Polymer Bulletin 24, 613-618 (1990).
Akers Lawrence C.
Gorgos Kathryn L.
Howmedica Inc.
Noguerda Alex
Richardson Peter C.
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