Polyether urethanes containing one reactive silane group and their use in moisture-curable polyether urethanes
View Patent ↗The present invention relates to 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, wherein the reactive silane groups are incorporated by the reaction of an isocyanate group with a compound corresponding to the formula 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 and R 1 represents an organic group which is inert to isocyanate groups at a temperature of 100° C. or less.
1. A polyether urethane containing composition comprising from 40 to 80 percent by weight based on polyether urethanes in the composition, 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 and a maximum total degree of unsaturation of less than 0.04 milliequivalents/g (meq/g), wherein the reactive silane groups are incorporated by the reaction of an isocyanate group with a compound corresponding to the formula
wherein
X represents identical or different organic groups which are inert to isocyanate groups below 1000°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 and
R 1 represents an organic group which is inert to isocyanate groups at a temperature of 100°C. or less.
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 and
R 1 represents an alkyl, cycloalkyl or aromatic group having 1 to 12 carbon atoms.
3. The polyether urethane of claim 1 wherein the reactive silane groups are incorporated as the reaction product of an isocyanate group and a compound corresponding to the formula
wherein
R 2 and R 6 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.
4. The polyether urethane of claim 1 wherein the reactive silane groups are incorporated as the reaction product of an isocyanate group and a compound corresponding to the formula
wherein
X represents identical or different alkyl or 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 R 5 are identical or different and represent alkyl groups having 1 to 4 carbon atoms and
R 3 and R 4 represent hydrogen.
5. The polyether urethane of claim 1 wherein the polyether segments have a number average molecular weight of 3000 to 12,000.
6. The polyether urethane of claim 2 wherein the polyether segments have a number average molecular weight of 3000 to 12,000.
7. The polyether urethane of claim 3 wherein the polyether segments have a number average molecular weight of 3000 to 12,000.
8. The polyether urethane of claim 4 wherein the polyether segments have a number average molecular weight of 3000 to 12,000.