Reactive compositions with an extended pot life

Details Reactive compositions with an extended pot life Reactive compositions with an extended pot life

C - Chemistry, Metallurgy

08

G

C08G 18/32 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C09D 175/04 (2006.01) D06N 3/14 (2006.01)

Patent

CA 2212900

The present invention relates to reactive compositions containing (A) NCO prepolymers based on (cyclo)aliphatic polyisocyanates having an NCO content of 1 to 8 wt.% and a monomeric polyisocyanate content of less than 2 wt.%, (B) amine-free chain extenders containing at least 50 equivalent percent of a compound melting between 50° and 160°C having formula (I) HO-X-Y-X-OH (I) wherein Y denotes methylene, ethylene, -C.ident.C-, 1,4-, 1,3-, or 1,2-cyclo- hexylene, or 1,4-, 1,3-, or 1,2-phenylene, and X denotes methylene, -OCH2CH2- (wherein oxygen is bonded to group Y), or 1,4-, 1,3-, or 1,2-cyclohexylene, and (C) 0 to 20 wt.%, relative to component (A), of inert organic solvents, wherein the equivalent ratio of the free NCO groups of component (A) to the NCO-reactive groups of component (B) is 0.90 to 1.35.

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