Method of rendering surfaces nonfogging and resulting articles
AssigneeArthur D. Little, Inc.
InventorsRichard E. Merrill, Arthur A. Massucco
Life of this patent
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Abstract
A method for treating a surface of a substrate to render it nonfogging and the resulting article formed by the treatment. A thin film coating of a block copolymer containing alternating blocks of polyurethane and a hydrophilic copolyacrylic is adhered to the surface to be made nonfogging. The copolyacrylic is a copolymer of a hydroxy substituted acrylate and an ethylenically unsaturated acid such as acrylic acid. By varying the weight ratio of polyetherurethane/copolyacrylic it is possible to vary the flexibility of the coating and hence to widen the range of substrates to which the treatment is applicable, e.g., from flexible wrapping material to rigid mirrors.
Claims27
A method for rendering a surface of a substrate nonfogging, comprising the step of adhering to said surface a thin transparent film of a block copolymer characterized as containing alternating blocks of a hydrophilic polyetherurethane and of a hydrophilic polyacrylic which is a copolymer of a hydroxy-substituted acrylate and an ethylenically unsaturated acid, the weight ratio of said polyetherurethane to said copolymer ranging between about 10 to 90 and about 40 to 60.
An article of manufacture comprising a substrate having on at least one surface thereof a nonfogging, transparent coating comprising a thin transparent film of a block copolymer, the blocks of which are characterized as being a hydrophilic polyetherurethane alternating with a hydrophilic polyacrylic which is a copolymer of a hydroxy-substituted acrylate and an ethylenically unsaturated acid, the weight ratio of said polyetherurethane to said copolymer ranging between about 10 to 90 and about 40 to 60.
Dependencies are inferred from the claim text.