Manufacturing ultramicrocellular polymer foams at low pressure

Details Manufacturing ultramicrocellular polymer foams at low pressure Manufacturing ultramicrocellular polymer foams at low pressure

C - Chemistry, Metallurgy

08

J

C08J 9/12 (2006.01) B29C 44/34 (2006.01)

Patent

CA 2344489

The invention disclosed provides a method for producing ultramicrocellular polymer foams at low pressures. A polymer is saturated with a blowing agent at low temperatures and pressures within a short time period, due to retrograde vitrification. The blowing agent may be in the form of a gas or a volatile liquid. Polymer-blowing agent combinations are selected to provide a processing temperature/pressure in the area below the positive slope portion of the retrograde vitrification profile of the glass transition temperature of the polymer versus pressure. The polymer thus saturated has an exceptionally high blowing agent content, and is then foamed to produce materials with small cells and high cell density.

L'invention concerne un procédé de production de mousses polymères ultramicrocellulaires à basses pressions. Un polymère est saturée à l'aide d'un gonflant, à des températures et pressions faibles pendant une courte période, par vitrification rétrograde. Le gonflant peut se présenter sous la forme d'un gaz ou d'un liquide volatil. Des combinaisons de polymère-gonflant sont sélectionnées de sorte que la température/pression de traitement se trouvent au-dessous de la partie en pente du profil de vitrification rétrograde de la température de transition vitreuse du polymère par rapport à la pression. Le polymère ainsi saturé présente une teneur exceptionnellement élevée en gonflant et est expansé de sorte que des matériaux à petites cellules et densité de cellules élevée soient produits.

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