Hydrophilic compositions which are fog-resistant
First Claim
1. A polymer composition which when cured exhibits anti-fogging properties consisting essentially of:
- (a) a water-soluble polyvinyl alcohol polymer and a water-soluble polyvinyl pyrollidone polymer,the polyvinyl alcohol polymer having a weight average molecular weight of about 20,000 to about 200,000 and the polyvinyl pyrollidone polymer having a weight average molecular weight of about 30,000 to about 400,000,and (b) a crosslinking agent comprised of a melamine, a mineral acid or a strong organic acid,said crosslinking agent being present in an amount up to about 50% by weight based upon the weight of the non-volatile components contained in the composition.
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Accused Products
Abstract
A polymer composition in the form of an alloy is disclosed, having hydrophilic and anti-fogging properties. The polymer alloy can be used as a coating, as an unsupported film or as a substrate having the desired anti-fogging properties.
The composition can be used where hydrophilic properties are desired. Surfaces coated with the composition described herein are more readily wetted by water or aqueous fluids, and may have a coefficient of friction of 0.10 or less when in contact with water.
The preferred composition contains a water-soluble polyvinyl alcohol and a water-soluble polyvinyl pyrollidone polymer in a weight ratio of about 4:1 to about 1:10.
A crosslinking agent comprised of a melamine, a mineral acid or a strong organic acid is included.
The composition is preferably applied to a substrate, such as a lens, and cured to form the coating.
70 Citations
13 Claims
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1. A polymer composition which when cured exhibits anti-fogging properties consisting essentially of:
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(a) a water-soluble polyvinyl alcohol polymer and a water-soluble polyvinyl pyrollidone polymer, the polyvinyl alcohol polymer having a weight average molecular weight of about 20,000 to about 200,000 and the polyvinyl pyrollidone polymer having a weight average molecular weight of about 30,000 to about 400,000, and (b) a crosslinking agent comprised of a melamine, a mineral acid or a strong organic acid, said crosslinking agent being present in an amount up to about 50% by weight based upon the weight of the non-volatile components contained in the composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12, 13)
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8. A method of treating a substrate to render it substantially fog-resistant comprising applying to the substrate a composition which consists essentially of (a) a water-soluble polyvinyl alcohol polymer and a water soluble polyvinyl pyrollidone polymer,
the polyvinyl alcohol polymer having a weight average molecular weight of about 20,000 to about 200,000 and the polyvinyl pyrollidone polymer having a weight average molecular weight of about 30,000 to about 400,000, and (b) a crosslinking agent selected from the group consisting of a melamine, a mineral acid and a strong organic acid, said crosslinking agent being present in an amount up to about 50% by weight based on the weight of the non-volatile components contained in the composition.
Specification