Surfactant-stabilized organoalkoxysilane composition

• US 20090053411A1
• Filed: 09/01/2006
• Published: 02/26/2009
• Est. Priority Date: 09/02/2005
• Status: Active Grant

• Current Assignee: Sika Technology Ag (Compagnie de Saint-Gobain SA)
• Original Assignee: Sika Technology Ag (Compagnie de Saint-Gobain SA)
• Inventors: Huck, Wolf-Rudiger, Sutter, Jolanda
• Granted Patent: US 8,377,191 B2
• Time in Patent Office: Days
• US Class Current: 427/207.100
• CPC Class Codes: C08L 83/08 containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen

Abstract

The present invention relates to organoalkoxysilane compositions which comprise at least one organoalkoxysilane S, and at least one anhydrous surfactant T, where the weight fraction of all of the organoalkoxysilanes S is 33% by weight, based on the weight of the organoalkoxysilane composition, and where the ratio of the weight sum of all of the organoalkoxysilanes S to the weight sum of all of the anhydrous surfactants T (S:T) has a value of from 5:1 to 1:2.

Claims

1. An organoalkoxysilane composition comprising at least one organoalkoxysilane S and at least one anhydrous surfactant T, the weight fraction of the sum of all of the organoalkoxysilanes S being ≧

33% by weight, based on the weight of the organoalkoxysilane composition, and

the ratio of the weight sum of all the organoalkoxysilanes S to the weight sum of all the anhydrous surfactants T (S;

T) has a value of 5;

1 to 1;

2.

2. The organoalkoxysilane composition of claim 1, wherein the surfactant T is a nonionic surfactant.

3. The organoalkoxysilane composition of claim 1, wherein the weight ratio of organoalkoxysilane S to anhydrous surfactant T (S:

T) has a value of 3;

1 to 2;

3.

4. The organoalkoxysilane composition of claim 1, wherein the weight fraction of the sum of all the organoalkoxysilanes S is ≧

40% by weight, based on the weight of the organoalkoxysilane composition.

5. The organoalkoxysilane composition of claim 1, wherein the organoalkoxysilane S is an aminosilane.

6. The organoalkoxysilane composition of claim 1, wherein the aminosilane has the formula (I)

where R¹ is an alkyl group having 1 to 8 C atoms, preferably a methyl or an ethyl group, more particularly a methyl group;

R² is an alkyl group having 1 to 5 C atoms, preferably a methyl group or an ethyl group or an isopropyl group, more particularly a methyl group or an ethyl group;

R³ is a linear or branched alkylene group having 1 to 4 C atoms, more particularly propylene;

R⁴ is H or a linear or branched alkyl group having 1 to 10 C atoms or is a substituent of the formula (II)

R⁵ is H or a linear or branched alkyl group having 1 to 10 C atoms or is a linear or branched alkyl group having 1 to 10 C atoms with further heteroatoms or is a substituent of the formula (II)

and a is 0, 1 or 2, more particularly 0 or 1, preferably 0.

7. The organoalkoxysilane composition of claim 6, wherein R⁵ is CH₂CH₂NH₂.

8. The organoalkoxysilane composition of claim 6, wherein the aminosilane is selected from the group encompassing aminosilanes of the formulae (III), (IV), and (V)

9. The organoalkoxysilane composition of claim 6, wherein the organoalkoxysilane S is an aminosilane, which is a reaction product of an aminosilane of the formula (I) but has at least one secondary or primary amino group with a compound (ARV) which contains at least one functional group which is able to react with a primary or secondary amino group.

10. The organoalkoxysilane composition of claim 9, wherein the functional group which is able to react with a primary or secondary amino group is an epoxy group.

11. The organoalkoxysilane composition of claim 8, wherein the organoalkoxysilane S is an aminosilane, which is a reaction product of an aminosilane of the formulae (III) or (IV) with a compound containing epoxy groups.

12. The organoalkoxysilane composition of claim 10, wherein the compound containing epoxy groups is an epoxysilane, more particularly an epoxysilane of the formula (VI)

where R^1′

is an alkyl group having 1 to 8 C atoms, preferably a methyl or an ethyl group, more particularly a methyl group;

R^2′

is an alkyl group having 1 to 5 C atoms, preferably a methyl group or an ethyl group or an isopropyl group, more particularly a methyl group or an ethyl group;

R^3′

is a linear or branched alkylene group having 1 to 4 C atoms, more particularly propylene; and

where a′

is 0, 1 or 2, more particularly 0 or 1, preferably 0.

13. The organoalkoxysilane composition of claim 6, wherein a=0 and R² is methyl and R³ is propylene.

14. A method for promoting adhesion, comprising applying the organoalkoxysilane composition of claim 1 to a substrate.

15. A method for pretreatment, comprising applying the organoalkoxysilane composition of claim 1 as an agent for pretreating to substrate surfaces to be adhesively bonded or sealed, in order to improve the adhesion of an adhesive or sealant applied thereto.

16. A method for pretreatment agent formation, comprising producing an aqueous pretreatment agent from the organoalkoxysilane composition of claim 1 to improve the adhesion of adhesives.