Process for preparing a sheet of polymer-based foam

Details Process for preparing a sheet of polymer-based foam Process for preparing a sheet of polymer-based foam

C - Chemistry, Metallurgy

08

J

18/31

C08J 9/00 (2006.01) A61L 15/26 (2006.01) B29C 44/34 (2006.01) C08G 18/10 (2006.01) A61F 13/15 (2006.01)

Patent

CA 2027894

The present invention is predicated on the discovery of a continuous process for the preparation of a polymer-based foam sheet at ambient temperatures wherein the foam is produced from a reaction product capable of curing at ambient temperatures formed by the reaction of a reactant composition comprising a prepolymer, such as an isocysanate-capped polyether, and water comprising (a) providing a continuous substrate; (b) depositing said reaction product onto said substrate; (c) compressing said reaction product by subjecting said product to at least one compression of a predetermined degree after said reaction product has creamed but prior to the time said reaction product has finally cured; and (d) finally curing said reaction product. An apparatus for the production of the aforesaid foam is also contemplated.

L'invention porte sur la découverte d'un procédé en continu pour la préparation à température ambiante d'une feuille de mousse polymérique; celle-ci est obtenue à partir d'un produit de réaction pouvant être réticulé à température ambiante, par réaction d'une composition comprenant un prépolymère, comme un polyéther terminé par le groupe isocyanate, et de l'eau. Le procédé consiste : a) à préparer un substrat continu; b) à déposer le produit de réaction sur le substrat; c) à comprimer le produit de réaction en le soumettant à au moins une compression de degré déterminé préalablement, après crémage du produit, mais avant sa réticulation finale; d) enfin, à réticuler le produit de réaction. On envisage également un appareil pour la production de cette mousse.

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