Process for making a paintable polymer article

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 7/00 (2006.01) C08J 5/24 (2006.01) C08J 7/04 (2006.01) C09D 167/06 (2006.01)

Patent

CA 2230964

A process for making a paintable polymer article is described which comprises impregnating a polymeric substrate having a plurality of pores, the pores having a number average pore cross section of less than 50 square microns, with a liquid sealant having a viscosity less than 25 mPa.s and heating the impregnated polymeric substrate to cure the sealant. The paintable polymer article may be coated with a paint to form a painted polymer article. The inventors have found that this invention helps prevent paint popping due to the expansion of solvents trapped in voids in the polymer article during paint drying or curing operations, particularly paint popping caused by voids in the polymer article which are exposed by cutting or trimming the polymer article after compression molding.

La présente invention concerne un procédé de fabrication d'un objet en polymère pouvant être peint, qui comprend l'imprégnation d'un substrat polymère, présentant une multitude de pores dont la section moyenne est inférieure à 50 microns carrés, avec un produit de scellement liquide dont la viscosité est inférieure à 25 mPa.s et le chauffage du tout pour durcir le produit de scellement. L'objet en polymère peut être peint. Il s'est révélé que la présente invention aide à empêcher la formation de cratères due à la dilatation de solvants emprisonnés dans des espaces vides de l'objet pendant les opérations de séchage ou de durcissement de la peinture, en particulier la formation de cratères dans la peinture causée par des espaces vides de l'objet qui sont découverts par coupage ou ébarbage après le moulage par compression.

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