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Material for imparting non-stick and non-wetting properties
| Details |
Inventors: Carre, Alain; Prassas, Michel; Waku-Nsimba, Jean;
Assignee: Corning Incorporated (Corning, NY)
Primary Examiner: Marquis; Melvyn I.
Assistant Examiner:
Attorney, Agent or Firm: Peterson; Milton M., Gheorghiu; Anca C.
A material system and method for imparting non-stick and non-wetting properties to an inorganic article having hydroxyl groups on its surface, the system comprising a silane having the formula R.sub.n SiX.sub.4-n, wherein n is 1-2 and X is a hydrolyzable group, a colloidal metal oxide sol, and an acidified aqueous mixture with a lower alkanol. |
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DETAILED DESCRIPTION We claim: 1.
A material system for imparting improved abrasion resistance, non-stick and non-wetting properties to an inorganic article having hydroxyl groups on its surface, the material system comprising the following components: (a) a silane having the formula R.
sub.
n SiX.
sub.
4-n, wherein each R is chosen independently from the group consisting of methyl radical, ethyl radical, or propyl radical, unsubstituted or partially or totally substituted by fluorine atoms; X is a hydrolyzable group chosen from the group consisting of methoxy, ethoxy and chloro groups; and, n=1 or 2; (b) a colloidal metal oxide sol selected from the group consisting of silica, titania, zirconia and alumina, and (c) an acidified aqueous mixture with a lower alkanol.
2.
A material system in accordance with claim 1 wherein the silane is diethoxydimethyl silane.
3.
A material system in accordance with claim 1 wherein the colloidal metal oxide is silica.
4.
A material system in accordance with claim 1 wherein the inorganic article is a glass or a glass-ceramic article.
5.
A material system in accordance with claim 1 wherein the lower alkanol is ethanol.
6.
A method of imparting non-stick and non-wetting properties to an inorganic article having hydroxyl groups on its surface, the method comprising the following steps: (1) mixing a colloidal metal oxide sol selected from the group consisting of silica, titania, zirconia and alumina, with an acidified aqueous mixture of a lower alkanol and a silane having a formula R.
sub.
n SiX.
sub.
4-n, wherein each R is chosen independently from the group consisting of methyl radical, ethyl radical, or propyl radical, unsubstituted or partially or totally substituted by fluorine atoms; X is a hydrolyzable group chosen from the group consisting of methoxy, ethoxy and chloro groups; and, n=1 or 2; (2) applying a coating of the mixture to a surface of an inorganic article; and, (3) thermally heating the coating at a temperature of at least 100.
degree.
C.
to form a solid, transparent film on the inorganic article surface
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