C - Chemistry – Metallurgy – 07 – D
Patent
C - Chemistry, Metallurgy
07
D
402/159, 252/43
C07D 251/06 (2006.01) C08G 18/02 (2006.01) C08G 18/09 (2006.01) C08G 18/32 (2006.01) C08G 18/42 (2006.01) C08G 18/62 (2006.01) C08G 18/78 (2006.01) C08G 18/79 (2006.01) C09D 175/04 (2006.01)
Patent
CA 2301071
The invention concerns a method for preparing a (poly)isocyanate composition with reduced viscosity comprising at least a dimeric isocyanate with uretidine-dione unit from initial monomeric isocyanates, characterised in that the initial reaction medium is heated, in the absence of a dimerization catalyst, to a temperature of not less than 50 ·C and not more than 200 ·C for a duration of not more than 24 hours.
Cette invention concerne un procédé de préparation d'une composition (poly)isocyanate de viscosité réduite comprenant au moins un isocyanate dimère à motif urétidine-dione à partir d'isocyanates monomères de départ, caractérisé en ce que l'on chauffe le milieu réactionnel de départ, en l'absence de catalyseur de dimérisation, à une température d'au moins 50 ~C et d'au plus 200 ~C pendant une durée d'au plus 24 heures.
Bernard Jean-Marie
Carlo Michel
Charriere Eugenie
Randu Stephane
Revelant Denis
Rhodia Chimie
Robic
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