High solubility size composition for fibers

C - Chemistry – Metallurgy – 03 – C

Patent

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Details

400/5504, 117/47

C03C 25/32 (2006.01) C03C 25/26 (2006.01) C08J 5/08 (2006.01)

Patent

CA 2291164

A high solubility size composition is provided which may be applied to glass fibers useful for reinforcing polymeric materials. The size composition includes: a first film former comprising a polyether-based or polyester-based thermoplastic polyurethane derived from a saturated, non-cross-linkable polyether or polyester; a second film former comprising at least one ingredient selected from i) a vinyl acetate glycidyl methacrylate copolymer and ii) a mixture of a vinyl acetate glycidyl methacrylate copolymer and a vinyl acetate homopolymer; a silane coupling agent; and water. Using glass fibers coated with the high solubility size composition allows the advantageous production of low-pigmented or non-pigmented molded parts having enhanced surface appearance and color uniformity.

L'invention concerne une composition d'encollage à haute solubilité pouvant être appliquée à des fibres de verre utilisées pour renforcer des matières polymères. La composition d'encollage comprend un agent filmogène comprenant un polyuréthane thermoplastique, à base de polyéther ou de polyester, dérivé d'un polyéther ou d'un polyester saturé, non réticulable, un second agent filmogène comprenant au moins un ingrédient sélectionné dans le groupe constitué par i) un copolymère vinyle acétate glycidyle méthacrylate et un homopolymère vinyle acétate et ii) un mélange d'un copolymère vinyle acétate glycidyle méthacrylate et un homopolymère vinyle acétate. Cette composition comprend également un agent de couplage au silane et de l'eau. L'utilisation de fibres de verre enrobées de la composition d'encollage à haute solubilité permet de produire des pièces moulées faiblement pigmentées ou non pigmentées présentant un aspect de surface améliorée et une uniformité de couleur.

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