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US 4,645,816 AGranted
Novel vulcanizable silane-terminated polyurethane polymers
AssigneeUnion Carbide Corporation
InventorsEric R. Pohl, Frederick D. Osterholtz
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Abstract
Room-temperature curable isocyanate terminated polyurethane polymers whose terminal isocyanate groups have been reacted with a silane monomer having at least one dialkoxy silane group and an organo-functional group with at least one active hydrogen. The polymers crosslink to produce elastomeric polymers with improved elongation and flexibility.
Claims9
A process for producing vulcanizable, dihydrocarbyloxysilyl-terminated polyurethane polymers having terminal end-blocking units of the formula:
- ##STR7## wherein R is C.sub.1 -C.sub.16 alkyl or C.sub.6 -C.sub.12 aryl;
- R.sup.1 is C.sub.1 -C.sub.4 alkyl;
- R.sub.2 is C.sub.2 -C.sub.18 alkylene or C.sub.6 -C.sub.18 arylene;
- and
- Z is --O--, --S-- or --NR.sup.3, wherein R.sup.3 is hydrogen, ##STR8## or C.sub.1 -C.sub.16 alkyl, aminoalkyl or diaminoalkyl, with the proviso that when Z is --O--, R.sup.2 must be C.sub.4 -C.sub.18 alkylene or C.sub.6 -C.sub.18 arylene, which comprises reacting:
- (a) the --NCO terminal groups of an isocyanate-terminated polyurethane prepolymer with
- (b) at least a stoichiometric amount of silane monomer of the formula:
- ##STR9## wherein R, R.sup.1, R.sup.2 and Z are as defined above.
5 more elements
Dependencies are inferred from the claim text.