Colored polyvinyl butyral interlayer with improved haze...

B - Operations – Transporting – 32 – B

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B32B 17/10 (2006.01) B44C 5/04 (2006.01) C08J 3/22 (2006.01) C08J 7/04 (2006.01)

Patent

CA 2369130

A laminar structure comprised of at least two layers of glass and a sheet of plasticized PVB prepared by providing a color concentrate comprised of solid pigmented chips wherein the chips have a preselected size range to minimize haze in the laminated structure and are dispersed in a low molecular weight polyvinyl butyral resin, said chips comprising from about 10 to 60 weight percent of the color concentrate, depositing said color concentrate on a roughened surface of polyvinyl butyral sheeting as a dried colored coating or directly melt incorporating, and thereafter laminating said sheeting between the surfaces of layers of glass.

La présente invention concerne une structure lamellaire qui comprend au moins deux couches de verre et une feuille de PVB que l'on prépare en apportant un concentré colorant composé de cristaux pigmentés solides. Ces cristaux sont présélectionnés dans une plage de calibre permettant de minimiser l'apparence trouble de la structure lamellaire et ils sont dispersés dans une résine de polybutyral de vinyle de poids moléculaire faible, ces cristaux étant composés d'environ 10 à 60 pour-cent de concentré colorant. On dépose ce concentré de colorant sur la surface rugueuse d'une feuille de polybutyral de vinyle sous forme de revêtement coloré et séché ou en le fondant directement dans le matériau. Puis on stratifie cette feuille entre les surfaces de couches de verre.

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