Process for preparing compact or cellular polyurethane...

C - Chemistry – Metallurgy – 08 – G

Patent

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Details

C08G 18/76 (2006.01) C08G 18/10 (2006.01) C08G 18/42 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08J 3/14 (2006.01) C08J 9/04 (2006.01)

Patent

CA 2259934

A process is disclosed for preparing compact and preferably cellular polyurethane elastomers by reacting: (a) high-molecular polyhydroxyl compounds and optionally (b) low-molecular chain-lengthening and/or cross-linking agents with (c) 1,4-phenylene diisocyanate (p-PDI) and at least one additional aromatic diisocyanate selected from the group of toluylene-diisocyanate, diphenylmethane-diisocyanate, 3,3'dimethyl-diphenyl-diisocyanate, 1,2- diphenylethane-diisocyanate and/or an aliphatic diisocyanate with 4 to 12 carbon atoms and/or a cycloaliphatic diisocyanate with 6 to 18 carbon atoms, in the presence or absence of (d) catalysts; (e) foaming agents; and (f) additives. Components (a), (c) and optionally (c) are preferably reacted after their prepolymerisation. Also disclosed are isocyanate prepolymers suitable for preparing these elastomers.

Selon le procédé décrit de préparation d'élastomères de polyuréthanne compacts et de préférence cellulaires, on fait réagir: (a) des composés polyhydroxyles de haut poids moléculaire et le cas échéant (b) des agents de réticulation et/ou d'allongement de la chaîne de faible poids moléculaire avec (c) du 1,4-phénylène-diisocyanate (p-PDI) et au moins un diisocyanate aromatique additionnel sélectionné dans le groupe constitué par le toluylène-diisocyanate, le diphénylméthane-diisocyanate, le 3,3'-diméthyle-diphényle-diisocyanate, le 1,2-diphényléthane-diisocyate et/ou un diisocyanate aliphatique avec 4 à 12 atomes de carbone et/ou un diisocyanate cycloaliphatique avec 6 à 18 atomes de carbone, en présence ou en l'absence de (d) catalyseurs; (e) agents gonflants; et (c) additifs. On fait de préférence réagir les éléments constitutifs (a), (c) et le cas échéant (b) après leur prépolymérisation. L'invention concerne également des prépolymères d'isocyanate utiles à cet effet.

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