C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/14 (2006.01) C08J 9/00 (2006.01)
Patent
CA 2144658
A cellular polymer containing perforated cell windows obtained in the presence of a perforating agent being a substance that has a critical surface free energy of less than 23 mJ/m2 is disclosed. The cellular polymers obtained according to this invention have a fine cell structure and show enhanced dimensional and thermal insulation stability. The invention also relates to rigid polyurethane foam prepared in the presence of, for example, particulate poly(tetrafluoroethylene) or a liquid polyfluoro- or perfluorocarbon, with a boiling point of at least 130 °C, as perforating agent.
Polymère cellulaire renfermant des fenêtres cellulaires perforées obtenues en présence d'un agent de perforation se présentant sous forme d'une substance dont l'énergie libre de surface critique et inférieure à 23 mJ/m2. Les polymères cellulaires produits selon le procédé de cette invention possèdent une structure cellulaire fine et une meilleure stabilité dimensionnelle et d'isolation thermique. Cette invention concerne également une mousse dure au polyuréthane préparée en présence par exemple de particules de poly(tétrafluoroéthylène) ou d'un polyfluorocarbure ou perfluorocarbure liquide comme agent de perforation dont le point d'ébullition est supérieur ou égal à 130 C.
Smits Guido F.
Thoen Johan A.
Smart & Biggar
The Dow Chemical Company
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