Alkoxysilane-terminated, moisture-hardening polyurethanes and their use in adhesives and sealing compositions

Claim 2

An alkoxysilane-terminated, moisture-hardening polyurethane prepared by the process comprising the steps of (a) reacting at least one OH-terminated linear diol or triol with at least one diisocyanate to form an NCO-terminated polyurethane having a number average NCO functionality of at least 2, (b) reacting some of the NCO-groups on the polyurethane obtained in step (a) with at least one linear or branched aliphatic alcohol containing from 1 to 18 carbon atoms or a monoalkylpolyalkylene glycol to form a polyurethane having a number average NCO functionality of at least 1 and less than 2, and (c) reacting substantially all the free NCO-groups in the polyurethane obtained from step (b) with at least one alkoxysilane corresponding to the formula ##STR3## in which X=--SH, --NHR 2 , ##STR4## --(NH--CH 2 --CH 2 ) n' --NHR 2 ; n'=1 or 2; R=--CH 3 , --CH 2 --CH 3 , or OR 1 ; R 1 =--(CH 2 --CH 2 --O) m --R 3 ; R 2 =H or an aliphatic or cycloaliphatic or aromatic hydrocarbon radical containing from 1 to 10 carbon atoms and optionally substituted with one or more C 1 -C 3 alkyl and/or C 1 -C 3 alkoxy groups; R 3 =an alkyl radical containing from 1 to 10 carbon atoms and optionally substituted with one or more C 1 -C 3 alkyl and/or C 1 -C 3 alkoxy groups; R 4 =an alkyl radical containing from 1 to 4 carbon atoms; and n=1-8; m=1-30; p≧1; and q+p=2.

Claim 3

The polyurethane of claim 1 wherein the linear diol or triol has a number average molecular weight of from about 300 to about 6500.

Claim 4

The polyurethane of claim 2 wherein the linear diol or triol has a number average molecular weight of from about 500 to about 3000.

Claim 5

The polyurethane of claim 1 wherein the OH-terminated linear diol or triol is an alkoxylation product.

Claim 6

The polyurethane of claim 4 wherein the alkoxylation product is an ethoxylation and/or propoxylation product.

Claim 7

The polyurethane of claim 5 wherein the linear diol or triol is at least one of ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, dipropylene glycol, a butanediol, a hexanediol, an octanediol, hydroxystearyl alcohol, trimethylene glycol, glycerol, or trimethylolpropane.

Claim 8

The polyurethane of claim 1 wherein the polyurethane obtained in step (b) has a number average NCO functionality of from about 1.2 to about 1.8.

Claim 9

The polyurethane of claim 1 wherein in step (b) a mono C 1 -C 6 alkylpolyalkylene glycol is employed having a number average molecular weight of from about 1000 to about 2000.

Claim 10

A process for the preparation of an alkoxysilane-terminated, moisture-hardening polyurethane comprising the steps of (a) reacting at least one OH-terminated linear diol or triol with at least one diisocyanate to form an NCO-terminated polyurethane having a number average NCO functionality of at least 2, (b) reacting some of the NCO-groups on the polyurethane from step (a) with at least one linear or branched aliphatic alcohol containing from 1 to 18 carbon atoms or a monoalkylpolyalkylene glycol to form a polyurethane having a number average NCO functionality of at least 1 and less than 2, and (c) reacting substantially all the free NCO-groups in the polyurethane obtained from step (b) with at least one alkoxysilane corresponding to the formula ##STR5## in which X=--SH, --NHR 2 , R 2 CH--CH--CH 2 --O--, --(NH--CH 2 --CH 2 ) n' --NHR 2 ; n'=1 or 2; R=--CH 3 , --CH 2 --CH 3 , or OR 1 ; R 1 =--(CH 2 --CH 2 --O) m --R 3 ; R 2 =H or an aliphatic or cycloaliphatic or aromatic hydrocarbon radical containing from 1 to 10 carbon atoms and optionally substituted with one or more C 1 -C 3 alkyl and/or C 1 -C 3 alkoxy groups; R 3 =an alkyl radical containing from 1 to 10 carbon atoms and optionally substituted with one or more C 1 -C 3 alkyl and/or C 1 -C 3 alkoxy groups; R 4 =an alkyl radical containing from 1 to 4 carbon atoms; and n=1-8; m=1-30; p≧1; and q+p=2.

Claim 11

A process for the preparation of an alkoxysilane-terminated, moisture-hardening polyurethane comprising the steps of (a) reacting at least one OH-terminated linear diol or triol with at least one diisocyanate to form an NCO-terminated polyurethane having a number average NCO functionality of at least 2, (b) reacting some of the NCO-groups on the polyurethane from step (a) with at least one linear or branched aliphatic alcohol containing from 1 to 18 carbon atoms or a monoalkylpolyalkylene glycol to form a polyurethane having a number average NCO functionality of at least 1 and less than 2, and (c) reacting substantially all the free NCO-groups in the polyurethane obtained from step (b) with at least one alkoxysilane corresponding to the formula ##STR5## in which X=--SH, --NHR 2 , R 2 CH--CH--CH 2 --O--, --(NH--CH 2 --CH 2 ) n' --NHR 2 ; n'=1 or 2; R=--CH 3 , --CH 2 --CH 3 , or OR 1 ; R 1 =--(CH 2 --CH 2 --O) m --R 3 ; R 2 =H or an aliphatic or cycloaliphatic or aromatic hydrocarbon radical containing from 1 to 10 carbon atoms and optionally substituted with one or more C 1 -C 3 alkyl and/or C 1 -C 3 alkoxy groups; R 3 =an alkyl radical containing from 1 to 10 carbon atoms and optionally substituted with one or more C 1 -C 3 alkyl and/or C 1 -C 3 alkoxy groups; R 4 =an alkyl radical containing from 1 to 4 carbon atoms; and n=1-8; m=1-30; p≧1; and q+p=2.

Claim 12

The process of claim 9 wherein in step (a) the linear diol or triol has a number average molecular weight of from about 300 to about 6500.

Claim 13

The process of claim 10 wherein the linear diol or triol has a number average molecular weight of from about 500 to about 3000.

Claim 14

The process of claim 9 wherein in step (a) the OH-terminated linear diol or triol is an alkoxylation product.

Claim 15

The process of claim 12 wherein the alkoxylation product is an ethoxylation and/or propoxylation product.

Claim 16

The process of claim 13 wherein the linear diol or triol is at least one of ethylene glycol, diethylene glycol, triethylene glycol, 1,2-propanediol, dipropylene glycol, a butanediol, a hexanediol, an octanediol, hydroxystearyl alcohol, trimethylene glycol, glycerol, or trimethylolpropane.

Claim 17

The process of claim 9 wherein the polyurethane obtained in step (b) has a number average NCO functionality of from about 1.2 to about 1.8.

Claim 18

The polyurethane of claim 9 wherein in step (b) a monoalkylpolyalkylene glycol is employed having a number average molecular weight of from about 1000 to about 2000.