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US 5,523,162 AGranted
Water repellent surface treatment for plastic and coated plastic substrates
AssigneePPG Industries, Inc.
InventorsHelmut Franz, George B. Goodwin, Gary J. Marietti
Life of this patent
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Abstract
A method and article are disclosed wherein a plastic substrate is provided with a more durable non-wetting surface by deposition of a silica primer layer prior to treatment with perfluoroalkylalkylsilane and optionally a fluorinated olefin telomer on the surface which comprises the silica primer layer.
Claims18
An article comprising a plastic substrate the surface of which is coated with
- a. a silica primer layer;
- and
- b. a perfluoroalkylalkylsilane bonded to said silica primer layer wherein said perfluoroalkylalkylsilane is selected from compounds having the general formula R.sub.m (R'.sub.n)SiX.sub.4-n-m, wherein R is a perfluoroalkylalkyl radical, R' is selected from the group consisting of vinyl and alkyl radicals, m is one, n is zero or one, m+n is less than 4, and X is a radical selected from the group consisting of halogen, alkoxy and acyl radicals.
A method of producing a non-wetting surface on a plastic substrate comprising the steps of:
- a. depositing a silica primer layer on a surface of said substrate;
- and
- b. depositing on said silica primer layer a composition comprising a perfluoroalkylalkylsilane wherein said perfluoroalkylalkylsilane is selected from compounds having the general formula R.sub.m (R'.sub.n)SiX.sub.4-n-m, wherein R is a perfluoroalkylalkyl radical, R' is selected from the group consisting of vinyl and alkyl radicals, m is one, n is zero or one, m+n is less than 4, and X is a radical selected from the group consisting of halogen, alkoxy and acyl radicals.
Dependencies are inferred from the claim text.