Optics: eye examining – vision testing and correcting – Spectacles and eyeglasses – Ophthalmic lenses or blanks
Patent
1980-10-27
1981-11-17
Ziegler, J.
Optics: eye examining, vision testing and correcting
Spectacles and eyeglasses
Ophthalmic lenses or blanks
260 296WB, 424 80, 525205, 525206, C08L 3904, C08L 4500, G02C 704
Patent
active
043008208
ABSTRACT:
A 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.
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The Kendall Company
Ziegler J.
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