Patent ID: 7482420

Claim:
A method for making a silane-terminated polyurethane composition comprising: a) providing a prepolymer component, a monomeric component, and optionally at least one multifunctional component, wherein the prepolymer component comprises a silane-terminated polyurethane prepolymer, the monomeric component comprises a silane-terminated monomeric diisocyanate, and the optional multifunctional component comprises at least one of a trisilane, a tetrasilane, or a silane adduct component; and b) combining and reacting the prepolymer component, the monomeric component, and optionally the at least one multifunctional component to form a silane-terminated polyurethane reaction product; wherein the silane-terminated polyurethane reaction product has a tensile strength of about 4 MPa or greater and an elongation of about 200% or greater; and, wherein the prepolymer component comprises a silane-terminated polyurethane prepolymer component comprising a prepolymer reaction product of at least one diisocyanate and at least one polyol with a mole ratio of isocyanate groups to hydroxyl groups of about 0.5:1 to about 0.9:1, said prepolymer reaction product is further reacted with a monomeric diisocyanate, followed by termination with an aminosilane endcapper of the formula: R—NH-A 1 -Si(R 1 ) x (OR 2 ) 3-x or a mercaptosilane endcapper of the formula: HS-A 1 -Si(R 1 ) x (OR 2 ) 3-x wherein R represents a C 1 - to C 10 alkyl group, a group having the formula -A 1 -Si(R 1 ) x (OR 2 ) 3-x , or a group having the formula —CH(COOR 3 )—CH 2 (COOR 4 ); A 1 represents a C 1 to C 10 linear, branched or cyclic alkylene group; R 1 represents a CH 3 or C 2 H 5 group; R 2 represents a C 1 to C 4 alkyl group; R 3 represents a C 1 to C 13 alkyl group; R 4 represents a C 1 to C 13 alkyl group; and x is 0 or 1.