Silane-containing adhesion promoter composition and sealants, adhesives and coatings containing same
View Patent ↗An adhesion promoter composition which comprises an oligomer of a functional alkoxysilane and a specific alkyl alkoxy silane is advantageously employed to improve the bonding of sealants/adhesives/coatings such as moisture curable silylated polymers on various substrates such as wet or dry concrete. In a preferred embodiment the adhesion promoter contains an octyltrialkoxysilane and an oligomer prepared from an epoxy or polyethylene oxide functional alkoxysilane.
1. A composition comprising:
a) a moisture-curable silylated polymer selected from the group consisting of a silylated polyurethane polymer and polyether functionalized with terminal alkoxysilane groups; and,
b) an adhesion promoting amount of at least one adhesion promoter consisting of:
i) at least one compound having the formula 1:
R—Si(R 1 ) 3 [1]
wherein
each R 1 is independently selected from alkoxy, and R is an alkyl group having 8 carbon atoms; and,
ii) at least one oligomer prepared from a compound having formula 1:
R—Si(R 1 ) 3 [1]
wherein
each R 1 is independently selected from alkoxy, or C 1 -C 3 alkyl, with the proviso that at least two of the R 1 groups are alkoxy, and R is an organic group containing epoxy or polyethyleneoxide functionality, wherein said composition is applied to or is on a concrete substrate.
2. The composition of claim 1 wherein the moisture-curable silylated polymer is a silylated polyurethane polymer.
3. The composition of claim 1 wherein the moisture-curable silylated polymer is polyether functionalized with terminal alkoxysilane groups.
4. The composition of claim 1 wherein the R group of the oligomer (ii) is epoxycyclohexyl or glycidoxypropyl.
5. The composition of claim 4 wherein the R group is glycidoxypropyl.
6. The composition of claim 1 wherein the compound (i) is octyltriethoxysilane.
7. The composition of claim 1 wherein the R 1 groups of compound (i) or oligomer (ii) are methoxy or ethoxy.
8. The composition of claim 1 wherein the oligomer (ii) is prepared from a compound selected from the group consisting of beta (3,4-epoxycyclohexyl)ethyltriethoxysilane, gamma-glycidoxypropyltriethoxysilane, gamma-glycidoxypropyl triethoxysilane, gamma-glycidoxypropylmethyldiethoxysilane and poly(ethyleneoxide)trimethoxysilane.
9. The composition of claim 1 wherein the adhesion promoter composition consists of at least one compound (i) in the range of 40 to 95 weight percent and the oligomer (ii) in the range of 5 to 60 weight percent based upon the total weight of components (i) and (ii).
10. The composition of claim 1 further comprising one or more component selected from the group consisting of plasticizers, fillers, UV stabilizers, thixotropes, colorants, moisture scavengers and catalysts.
11. A method for treating a substrate comprising:
a) providing a composition containing a moisture-curable silylated resin selected from the group consisting of a silylated polyurethane polymer and polyether functionalized with terminal alkoxysilane groups and an adhesion promoter, the adhesion promoter including,
i) at least one compound having the formula 1:
R—Si(R 1 ) 3 [1]
wherein
each R 1 is alkoxy, and
R is alkyl having from 8 carbon atoms; and,
ii) at least one oligomer prepared from a compound having formula 1:
R—Si(R 1 ) 3 [1]
wherein
each R 1 is independently selected from alkoxy, or C 1 -C 3 alkyl, with the proviso that at least two of the R 1 groups is alkoxy, and R is an organic group containing epoxy or polyethyleneoxide functionality; and
b) applying said composition to a surface of the substrate, wherein said substrate is concrete.
12. The method of claim 11 wherein the substrate has a pH of above 10.
13. The composition of claim 1 wherein the composition is a sealant, coating or adhesive.
14. A sealant, adhesive or coating composition comprising:
a) a moisture-curable moisture-curable silylated polymer selected from the group consisting of a silylated polyurethane polymer and polyether functionalized with terminal alkoxysilane groups; and,
b) an adhesion promoting amount of at least one adhesion promoter consisting of:
i) 40% to 95% by weight based upon the total weight of components (i) and (ii) of at least one compound having the formula 1:
R—Si(R 1 ) 3 [1]
wherein
each R 1 is independently selected from alkoxy, or C 1 -C 3 alkyl, with the proviso that at least two of the R 1 groups is alkoxy, and R is an alkyl group having from 8 to 20 carbon atoms; and,
ii) 5% to 60% by weight based upon the total weight of components (i) and (ii) of at least one oligomer prepared from a compound having formula 1:
R—Si(R 1 ) 3 [1]
wherein
each R 1 is independently selected from alkoxy, or C 1 -C 3 alkyl, with the proviso that at least two of the R 1 groups are alkoxy, and R is an organic group containing epoxy or polyethyleneoxide functionality, wherein said sealant, adhesive or coating composition is applied to or is on a concrete substrate.