发明名称 Hydrophobic silane coating for preventing conductive anodic filament (CAF) growth in printed circuit boards
摘要 An enhanced substrate for making a printed circuit board (PCB) includes a hydrophobic silane coating of a silane composition intermixed with a silane coupling agent applied to a glass fiber substrate. The silane coupling agent is applied to the surface of the substrate for coupling the substrate to a varnish coating. Applying the silane coupling agent to the surface of the substrate creates surface silanols, which are implicated in conductive anodic filament (CAF) growth. A silane composition, which reacts with the surface silanols, is applied to the surface of the substrate having the silane coupling agent applied thereto to form the hydrophobic silane coating. The surface presented by the hydrophobic silane coating/substrate is hydrophobic and essentially silanol-free. This surface is then dried, and varnish is applied thereto. Then, the substrate, hydrophobic silane coating and varnish are subjected to curing conditions to define the PCB.
申请公布号 US9351405(B2) 申请公布日期 2016.05.24
申请号 US201313784514 申请日期 2013.03.04
申请人 International Business Machines Corporation 发明人 Boday Dylan J.;Kuczynski Joseph
分类号 H05K3/00;D06M11/79;D06M13/513;D06M13/517 主分类号 H05K3/00
代理机构 代理人 Bussan Matthew J.
主权项 1. A method of making an enhanced substrate for a printed circuit board, comprising the steps of: providing a substrate that includes glass fiber; applying a silane coupling agent to the surface of the substrate, wherein the silane coupling agent includes an organofunctional group to bind to a varnish coating and a hydrolyzable group that binds to the surface of the substrate for coupling the substrate to the varnish coating, and wherein the surface of the substrate having the silane coupling agent applied thereto includes one or more surface silanols; and applying a silane composition comprising a silane selected from a group consisting of chlorotrimethylsilane, hexamethyldisilazane, perfluorooctyl-1H,1H,2H,2H dimethylchlorosilane, (3,3,3-trifluoropropyl)dimethyl-chlorosilane, and combinations thereof, to the surface of the substrate having the silane coupling agent applied thereto to form a hydrophobic silane coating a monolayer thick that is an intermixed layer of the silane composition and the silane coupling agent, wherein the silane composition reacts with the one or more surface silanols, and wherein the hydrophobic silane coating presents a surface that is hydrophobic and essentially silanol-free.
地址 Armonk NY US