Mold for reaction injection molding and reaction injection...

B - Operations – Transporting – 29 – C

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Details

B29C 67/24 (2006.01) B29C 33/58 (2006.01) B29C 33/60 (2006.01)

Patent

CA 2400465

The invention comprises a mold useful for the preparation of a polyurethane based article comprising a metal coated on the surfaces to come in contact with the polyurethane materials wherein the coating is a continuous matrix of cobalt or nickel having dispersed in such discontinuous matrix a fluorinated polyolefin polymer. In another aspect the invention is a process for injection molding a part from polyurethane materials which process comprises injecting polyurethane based materials into a mold as described above, exposing the injected materials to conditions such that a solidified article is formed and removing the formed article from the mold. In another aspect the invention is an article comprising polyurethane material prepared by injection molding which contains about 0.5 percent by weight or less of an internal mold release and which can be coated in an industrial coating process without the need for a sealer coated on the article.

L'invention concerne un moule servant à préparer un article à base de polyuréthanne comportant un revêtement métallique sur les surfaces destinées à venir au contact des matériaux à base de polyuréthanne, ledit revêtement étant une matrice continue de cobalt ou de nickel dans laquelle est dispersée une matrice discontinue constituée d'un polymère polyoléfinique fluoré. Selon un autre aspect, l'invention concerne un procédé permettant le moulage par injection d'une pièce à partir de matériaux à base de polyuréthanne, lequel procédé consiste à injecter les matériaux à base de polyuréthanne dans un moule du type précité, à exposer les matériaux injectés à des conditions propres à la formation d'un article solidifié et à retirer l'article formé du moule. Selon un autre aspect, l'invention concerne un article comprenant un matériau à base de polyuréthanne préparé par moulage par injection, lequel matériau renferme environ 0,5 pour-cent en poids, au plus, d'un lubrifiant de moule interne, et peut être appliqué dans le cadre d'un procédé de revêtement industriel, sans qu'il soit besoin de revêtir l'article d'un agent d'étanchéification.

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