Foam plastic from disposable pressurized containers

Details Foam plastic from disposable pressurized containers Foam plastic from disposable pressurized containers

C - Chemistry, Metallurgy

08

G

C08G 18/70 (2006.01) B65D 83/14 (2006.01) C08G 18/10 (2006.01) C08G 18/30 (2006.01) C08G 18/79 (2006.01) C08G 18/80 (2006.01) C08J 9/14 (2006.01) C08L 75/04 (2006.01)

Patent

CA 2184107

Described is a composition, contained in disposable aerosol cans, for the production of cellular plastics, the composition being characterized in that the composition residue remaining in the can has a diisocyanate monomer concentration of less than preferably 5.0 % by wt. relative to the amount of residue in the emptied container. Since this concentration is reduced by a factor of aproximately 2, the residue is much less damaging to the environment than before. The composition contains in particular polymer MDI which can be produced from technical-grade MDI with an average number of functional groups per molecule of > 23 by separating off the diphenylmethanediisocyanates.

L'invention concerne une composition pour produire des matière plastiques cellulaires au moyen de récipients sous pression jetables, qui se caractérise en ce que la composition résiduelle restant dans le récipient sous pression a une teneur en diisocyanates monomères inférieure de préférence à 5,0 % en poids, par rapport au contenu résiduel du récipient vidé. Comme cette teneur est réduite d'un facteur d'environ 2, le volume résiduel restant dans le récipient est nettement moins polluant qu'auparavant. Ladite composition contient notamment des diisocyanates de diphénylméthane polymères, obtenus à partir de diisocyanates de diphénylméthane industriels dont la fonctionnalité moyenne est > 2,3, par séparation des diisocyanates de diphénylméthane.

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