Browse Prior Art Database

Conformal Coating of SLT Cards

IP.com Disclosure Number: IPCOM000090529D
Original Publication Date: 1969-May-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

McGee, HL: AUTHOR

Abstract

A plurality of substrates 1 is coated with polymeric material by a photopolymerization technique. The plurality of substrates 1 is masked, e.g., SLT cards, and is mounted on rotatable substrate holder 2. Substrate holder 2 is cooled by a coolant circulating through conduits 3 and 4. The cooling serves to cause a vaporous material entering chamber 14, at port 6, to condense onto substrates 1. Holder 2 is timed to rotate under light system 7, comprising an ultraviolet light source 8, lens 9 optical filter 10, and light pipe 11, and to remain there until a given thickness of a polymer film is deposited on substrates 1.

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Conformal Coating of SLT Cards

A plurality of substrates 1 is coated with polymeric material by a photopolymerization technique. The plurality of substrates 1 is masked, e.g., SLT cards, and is mounted on rotatable substrate holder 2. Substrate holder 2 is cooled by a coolant circulating through conduits 3 and 4. The cooling serves to cause a vaporous material entering chamber 14, at port 6, to condense onto substrates 1. Holder 2 is timed to rotate under light system 7, comprising an ultraviolet light source 8, lens 9 optical filter 10, and light pipe 11, and to remain there until a given thickness of a polymer film is deposited on substrates 1.

The film thickness can be measured by juxtaposing an oscillating crystal, not shown, to substrates 1 at the time of photolysis. Suitable materials which can be used in this process are vinyl and substituted vinyl monomers such as styrene, divinyl benzene and halogenated derivatives of them, acrolein, acrylates, methacrylates, vinyl acetates, silicone oils, and the like. Relatively nonvolatile materials can also be used. For example, epoxy compounds such as bisphenol A-epichlorohydrin and resorcinol diglycidyl ether can be used to advantage.

Where the source material is relatively nonvolatile, e.g., epoxy type materials, heat source 12 is provided. The nonvolatile material is vaporized by heating and is directed to substrates 1 under the underside of holder 2. A second light system 13 is also provided to photopolymerize t...