Foam and method of making

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 44/56 (2006.01)

Patent

CA 2411350

The present invention is directed to a process for producing a polypropylene foam by mixing a high melt strength polypropylene and a blowing agent to form a melt mixture, reducing the temperature of the melt mixture at the exit of the apparatus to an exit temperature that is no more than 30~C above the melt temperature of the neat polypropylene while maintaining the melt mixture at a pressure sufficient to prevent foaming; passing the mixture through said exit shaping orifice and exposing the mixture to atmospheric pressure, whereby the blowing agent expands causing cell formation resulting in foam formation, and orienting said foam. The foam is useful as tape backings, thermal and acoustical insulation and as a diffuse reflector for use in optical applications such as computer displays.

Cette invention se rapporte à un procédé servant à produire une mousse de polypropylène en mélangeant un polypropylène à forte résistance à la fusion et un agent gonflant, afin de former un mélange en fusion, en réduisant la température du mélange en fusion à la sortie de l'appareil jusqu'à obtenir une température de sortie qui n'est pas plus de 30 ·C supérieure à la température de fusion du polypropylène pur, tout en maintenant le mélange en fusion à une pression suffisante pour empêcher le moussage; en faisant passer ledit mélange par l'orifice de façonnage de sortie et en exposant ledit mélange à une pression atmosphérique, de telle sorte que l'agent gonflant se dilate, entraînant ainsi la formation d'alvéoles produisant la formation de la mousse et l'orientation de la mousse. Cette mousse est utile comme support de bande, comme isolation thermique et acoustique et comme réflecteur diffusant dans des applications optiques, telles que des éléments d'affichage d'ordinateurs.

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