Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1981-09-03
1984-01-17
Briggs, Sr., Wilbert J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 58, 525937, 523106, C08L 2904
Patent
active
044264925
ABSTRACT:
Stable three dimensional hydrogels which absorb water, but are insoluble in water, and are particularly useful for the making of soft contact lenses, are prepared by reacting a water insoluble polyvinyl resin which contains reactive hydroxyl groups in its polymer chain, with a di- or poly-basic acid anhydride, to thereby introduce pendant carboxyl groups into the polymer chain, followed by treatment of the thus obtained carboxylated polymer to effect a limited amount of crosslinking thereof whereby a sparingly crosslinked hydrophilic polymer is obtained which when immersed in water absorbs water and swells to form a hydrogel, which does not dissolve in water.
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P. Robinson, Design of Water Reducible Polymers for Use in Food Contact Applications, J. of Coatings Technology, vol. 53, No. 674, Mar. 1981, pp. 23-30.
Briggs Sr. Wilbert J.
Plastomedical Sciences, Inc.
Sellers Robert E. L.
Tone George L.
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