Low viscosity, alkoxysilane-functional prepolymers and a...

Details Low viscosity, alkoxysilane-functional prepolymers and a... Low viscosity, alkoxysilane-functional prepolymers and a...

2006-08-30

2011-11-29

Gulakowski, Randy (Department: 1766)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

C525S474000, C528S029000

Reexamination Certificate

active

08067522

ABSTRACT:
The present invention relates to a process for preparing alkoxysilane-functional prepolymers by reactingA) 1.0 equivalent of a polyol component have a number average molecular weight of 3000 g/mol to 20,000 g/mol and containing one or more polyoxyalkylene polyols or polyoxyalkylene polyol prepolymers withB) 1.05 to 1.50 equivalent of an isocyanate- and alkoxysilane-functional compound of formula I)whereinX, Y, and Z independently of one another are linear or branched C1-C8alkyl or C1-C8alkoxy radicals, wherein at least one of the radicals is a C1-C8alkoxy group andR is an organic radical having a functionality of at least two,and subsequently further reacting the remaining free NCO groups by allophanatization or by reaction withC) an isocyanate-reactive component.The present invention also relates to the alkoxysilane-functional prepolymers obtained by the process of the invention.

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