Sizing composition for sheet molding compound roving

C - Chemistry – Metallurgy – 03 – C

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C03C 25/26 (2006.01) B29C 70/12 (2006.01) C09D 123/08 (2006.01)

Patent

CA 2569435

An aqueous glass fiber sizing composition that includes a polymeric film forming component, at least one silane coupling agent, and one or more lubricants is provided. The polymeric film forming component of the sizing composition includes a silanated polyvinyl acetate, an epoxidized polyvinyl acetate, and a modified epoxy emulsion. In preferred embodiments, the film formers are present in the sizing composition in ratios of 70:25:5, 50:25:25, or 63:18:18 of silanated polyvinyl acetate, epoxidized polyvinyl acetate, and modified epoxy emulsion respectively. Fibers sized with the sizing composition in a sheet molding compound process have improved wet-out characteristics.

Une composition aqueuse de collage pour fibres optiques comprend un composant de formation de film polymère, au moins un agent de couplage de silane et au moins un lubrifiant. Le composé de formation de film polymère de la composition de collage comprend un polyvinyle acétate silanisé, un polyvinyle acétate époxydisé, et une émulsion époxyde modifiée. Dans des modes de réalisation préférés, les formateurs de films sont présents dans la composition de collage avec des rapports de 70:25:5, 50:25:25 ou 63:18:18 de polyvinyle acétate silanisé, de polyvinyle acétate époxydisé et d'émulsion époxyde modifiée, respectivement. Les fibres collées avec la composition de collage dans un processus utilisant le mélange à mouler en feuilles possèdent des caractéristiques améliorées en termes de pouvoir d'imprégnation complète.

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