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Browse Prior Art Database

Antifogging Material

IP.com Disclosure Number: IPCOM000088901D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Mittal, KL: AUTHOR

Abstract

An improved antifogging material is formed by combining a silane and a fluoroalcohol. Representative silanes are aminopropyl triethoxy, glycidoxypropyltrimethoxy, vinyltriethoxy, and chloropropyltrimethoxy. Silanes have the general chemical formula X(3)SiY, where X is a hydrolyzable group such as -OCH(3) or -OC(2)H(5) on silicon and Y is an organofunctional group. During application of the antifogging material from an aqueous medium, hydrolysis of silanes results in conversion of the X groups to silanol groups, SiOH. Thus, the hydrolyzed silane molecule is ambifunctional. It contains polar silanol groups capable of adhering to the surface of glass, metals, etc., and a group Y which is selected depending upon the purpose for which silanes are used.

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Antifogging Material

An improved antifogging material is formed by combining a silane and a fluoroalcohol. Representative silanes are aminopropyl triethoxy, glycidoxypropyltrimethoxy, vinyltriethoxy, and chloropropyltrimethoxy. Silanes have the general chemical formula X(3)SiY, where X is a hydrolyzable group such as -OCH(3) or -OC(2)H(5) on silicon and Y is an organofunctional group. During application of the antifogging material from an aqueous medium, hydrolysis of silanes results in conversion of the X groups to silanol groups, SiOH. Thus, the hydrolyzed silane molecule is ambifunctional. It contains polar silanol groups capable of adhering to the surface of glass, metals, etc., and a group Y which is selected depending upon the purpose for which silanes are used.

Good adhesion of silanes to glass is provided by formation of siloxane (Si-O- Si) linkages between the polar silanol groups of silanes and the SiOH groups on glass. Also Si-O-Si linkages are formed between adjoining silane molecules adsorbed on glass to provide stability to the deposited silane layer.

When equal parts of a fluoroalcohol and a silane are mixed, a new silico- fluoro compound is formed, which should adhere strongly to the glass surface by the mechanism already described and should provide an antiwetting or antifogging outer surface due to the presence of fluorocarbon moieties. The compound can be spray-deposited onto a glass surface from an aqueous solution of ethyl/alcohol; in the cas...