Moisture-curable, polyether urethanes with terminal cyclic urea/reactive silane groups and their use as sealants, adhesives and coatin
The present invention relates to moisture-curable, polyether urethanes having terminal cyclic urea/reactive silane groups and containing a) 20 to 100% by weight, based on the weight of a) and b), of a polyether urethane containing two or more terminal cyclic urea/reactive silane groups and one or more polyether segments, wherein the polyether segments have a number average molecular weight of at least 3000 and a degree of unsaturation of less than 0.04 milliequivalents/g, provided that the sum of the number average molecular weights of all of the polyether segments per molecule averages 6000 to 20,000, and wherein the terminal cyclic urea/reactive silane groups are incorporated as the reaction product of an isocyanate group with an aspartate silane to form a urea group which is converted to a cyclic urea group in the presence of a catalyst and heat, and b) 0 to 80% by weight, based on the weight of a) and b), of a polyether urethane containing one reactive silane group and one or more polyether segments having a number average molecular weight of 1000 to 15,000. The present invention also relates to sealant, adhesive and coating compositions containing these polyether urethanes.
1 . A moisture-curable, polyether urethane having terminal cyclic urea/reactive silane groups and comprising
a) 20 to 100% by weight, based on the weight of a) and b), of a polyether urethane containing two or more terminal cyclic urea/reactive silane groups and one or more polyether segments, wherein the polyether segments have a number average molecular weight of at least 3000 and a degree of unsaturation of less than 0.04 milliequivalents/g, provided that the sum of the number average molecular weights of all of the polyether segments per molecule averages 6000 to 20,000, and wherein the terminal cyclic urea/reactive silane groups correspond to tformula VIII and/or IX
wherein
X represents identical or different organic groups which are inert to isocyanate groups below 100° C., provided that at least two of these groups are alkoxy or acyloxy groups,
Y represents a linear or branched alkylene group containing 1 to 8 carbon atoms,
R 2 and R 5 are identical or different and represent organic groups which are inert to isocyanate groups at a temperature of 100° C. or less and
R 3 and R 4 are identical or different and represent hydrogen or organic groups which are inert towards isocyanate groups at a temperature of 100° C. or less, and
b) 0 to 80% by weight, based on the weight of a) and b), of a polyether urethane containing one reactive silane group and one or more polyether segments having a number average molecular weight of 1000 to 15,000.
2 . The polyether urethane of claim 1 wherein
X represents identical or different alkoxy groups having 1 to 4 carbon atoms,
Y represents a linear radical containing 2 to 4 carbon atoms or a branched radical containing 5 to 6 carbon atoms,
R 2 and R5 are identical or different and represent alkyl groups having 1 to 4 carbon atoms and
R 3 and R 4 represent hydrogen.
3 . The polyether urethane of claim 1 wherein the reactive silane group of component b) comprises a terminal cyclic urea/reactive silane group corresponding to formula VIII or IX.
4 . The polyether urethane of claim 2 wherein the reactive silane group of component b) comprises a terminal cyclic urea/reactive silane group corresponding to formula VIII or IX.
5 . The polyether urethane of claim 1 wherein polyether urethane a) is present in an amount of 20 to 90% by weight and polyether urethane b) is present in an amount of 10 to 80% by weight, wherein the percentages are based on the weight of a) and b).
6 . The polyether urethane of claim 2 wherein polyether urethane a) is present in an amount of 20 to 90% by weight and polyether urethane b) is present in an amount of 10 to 80% by weight, wherein the percentages are based on the weight of a) and b).
7 . The polyether urethane of claim 3 wherein polyether urethane a) is present in an amount of 20 to 90% by weight and polyether urethane b) is present in an amount of 10 to 80% by weight, wherein the percentages are based on the weight of a) and b).
8 . The polyether urethane of claim 4 wherein polyether urethane a) is present in an amount of 20 to 90% by weight and polyether urethane b) is present in an amount of 10 to 80% by weight, wherein the percentages are based on the weight of a) and b).
9 . The polyether urethane of claim 1 wherein polyether urethane a) is present in an amount of 30 to 80% by weight and polyether urethane b) is present in an amount of 20 to 70% by weight, wherein the percentages are based on the weight of a) and b).
10 . The polyether urethane of claim 2 wherein polyether urethane a) is present in an amount of 30 to 80% by weight and polyether urethane b) is present in an amount of 20 to 70% by weight, wherein the percentages are based on the weight of a) and b).
11 . The polyether urethane of claim 3 wherein polyether urethane a) is present in an amount of 30 to 80% by weight and polyether urethane b) is present in an amount of 20 to 70% by weight, wherein the percentages are based on the weight of a) and b).
12 . The polyether urethane of claim 4 wherein polyether urethane a) is present in an amount of 30 to 80% by weight and polyether urethane b) is present in an amount of 20 to 70% by weight, wherein the percentages are based on the weight of a) and b).
13 . The polyether urethane of claim 1 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
14 . The polyether urethane of claim 2 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
15 . The polyether urethane of claim 3 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
16 . The polyether urethane of claim 4 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
17 . The polyether urethane of claim 5 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
18 . The polyether urethane of claim 6 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
19 . The polyether urethane of claim 7 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
20 . The polyether urethane of claim 8 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
21 . The polyether urethane of claim 9 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
22 . The polyether urethane of claim 10 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
23 . The polyether urethane of claim 11 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
24 . The polyether urethane of claim 12 wherein the polyether segments of polyether urethane a) have a number average molecular weight of at least 6000 and the polyether segments of component b) have a number average molecular weight of 3000 to 12,000.
25 . A sealant, adhesive or coating composition containing the moisture-curable, alkoxysilane-functional polyether urethane of claim 1.