| 摘要 |
PROBLEM TO BE SOLVED: To provide silylated polyurethanes of exhibiting an excellent combination of mechanical properties, capable of forming a low-viscosity of sealant by curing at a reasonable time, and not having an excessive viscosity. SOLUTION: The silylated polyurethanes is prepared by reacting a polyol component having a terminal unsaturation less than 0.02 meq/g with a diisocyanate component to generate a hydroxyl-terminated prepolymer, and by hindering terminals of the prepolymer with an isocyanate silane of Formula OCN-R-Si-(X)m(-OR<SP>1</SP>)<SB>3-m</SB>where m is 0, 1 or 2, each R<SP>1</SP>is alkyl containing 1 to 4 of carbon atoms, each X is alkyl containing 1 to 4 of carbon atoms, and R is a bifunctional organic group. COPYRIGHT: (C)2009,JPO&INPIT
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