Silane-containing isocyanate-terminated polyurethane polymers
First Claim
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1. A curable composition comprising the reaction product of an isocyanate terminated polyurethane prepolymer having at least two urethane linkages per polymer molecule and a bis silane, said reaction product having a number average molecular weight of about 750 to about 20,000 and having 2 to about 9 functional groups, per average molecular weight, selected from the group consisting of:
- ##STR10## wherein R is a lower alkyl having 1 to about 6 carbons;
R1 is a lower alkyl having 1 to about 4 carbons;
each of R2 and R3 is an alkylene radical having 2 to 18 carbons or arylene radicals having 6 to 18 carbons, anda is an integer having values of 0 to 2;
##STR11## wherein R, R1 and a are as above,each of R4 and R5 is an alkylene radical having 1 to 4 carbons, andQ is a monovalent radical selected from the group consisting of hydrogen, alkyl having 1 to 4 carbons, phenyl, --COOR1 or --CN; and
##STR12## wherein R, R1 and a are as above,each of R7 and R8 is an alkylene radical having 1 to 4 carbons, andQ is a monovalent radical selected from the group consisting of hydrogen, alkyl having 1 to 4 carbons, phenyl, COOR1 or --CN,with the proviso that at least 0.1 percent of the total of said functional groups (1), (2), (3) and (4) is at least one of (2), (3), or (4).
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Abstract
Curable isocyanate prepolymers have been made in which all or a portion of the available isocyanate terminal groups have been reacted with a secondary amine-containing silane monomer having two trialkoxy silane groups.
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Citations
23 Claims
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1. A curable composition comprising the reaction product of an isocyanate terminated polyurethane prepolymer having at least two urethane linkages per polymer molecule and a bis silane, said reaction product having a number average molecular weight of about 750 to about 20,000 and having 2 to about 9 functional groups, per average molecular weight, selected from the group consisting of:
- ##STR10## wherein R is a lower alkyl having 1 to about 6 carbons;
R1 is a lower alkyl having 1 to about 4 carbons; each of R2 and R3 is an alkylene radical having 2 to 18 carbons or arylene radicals having 6 to 18 carbons, and a is an integer having values of 0 to 2;
##STR11## wherein R, R1 and a are as above,each of R4 and R5 is an alkylene radical having 1 to 4 carbons, and Q is a monovalent radical selected from the group consisting of hydrogen, alkyl having 1 to 4 carbons, phenyl, --COOR1 or --CN; and
##STR12## wherein R, R1 and a are as above,each of R7 and R8 is an alkylene radical having 1 to 4 carbons, and Q is a monovalent radical selected from the group consisting of hydrogen, alkyl having 1 to 4 carbons, phenyl, COOR1 or --CN, with the proviso that at least 0.1 percent of the total of said functional groups (1), (2), (3) and (4) is at least one of (2), (3), or (4). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
- ##STR10## wherein R is a lower alkyl having 1 to about 6 carbons;
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20. A method of formulating a sealant composition having enhanced wet adhesion which comprises:
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(1) reacting a polyol with a stoichiometric excess of a polyisocyanate to provide an --NCO terminated polyurethane prepolymer; and (2) end-capping at least 0.1% of said --NCO terminal groups by contacting them with a bis-silane selected from the group consisting of;
##STR16## wherein R is a lower alkyl having 1 to about 6 carbons;R1 is a lower alkyl having 1 to about 4 carbons, each of R2 and R3 is an alkylene radical having 2 to 18 carbons or arylene radicals having 6 to 18 carbons, and a is an integer having values of 0 to 2;
##STR17## wherein R, R1 and a are as above,each of R4 and R5 is an alkylene radical having 1 to 4 carbons, and Q is a monovalent radical selected from the group consisting of hydrogen, alkyl having 1 to 4 carbons, phenyl, --COOR1 or --CN; and
##STR18## wherein R, R1 and a are as above,each of R7 and R8 is an alkylene radical having 1 to 4 carbons, and Q is a monovalent radical selected from the group consisting of hydrogen, alkyl having 1 to 4 carbons, phenyl, COOR1 or --CN. - View Dependent Claims (21, 22, 23)
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Specification