Aqueous two-component organoalkoxysilane composition

• US 20070190345A1
• Filed: 08/31/2006
• Published: 08/16/2007
• Est. Priority Date: 09/02/2005
• Status: Abandoned Application

• 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
• Application Number:
  US11/513,172
• Publication Number:
  US 20070190345A1
• Time in Patent Office: Days
• US Class Current: 428/448
• CPC Class Codes: C08G 77/04 Polysiloxanes
• CPC Class Codes: C09J 4/00 Adhesives based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; adhesives, based on monomers of macromolecular compounds of groups C09J183/00 - C09J183/16
• CPC Class Codes: C09J 5/02 involving pretreatment of the surfaces to be joined

Abstract

The present invention relates to aqueous two-component adhesion promoter compositions and also to their use in methods of adhesive bonding or sealing. Additionally it relates to packaging consisting of the two-component composition and also a pack having two chambers. The two-component adhesion promoter composition is composed of a first component K1 comprising at least one organoalkoxysilane S and at least one anhydrous surfactant T; and of a second component K2 comprising at least water and at least one acid, the acid being present in an amount such that, after components K1 and K2 have been mixed, the resulting mixture is acidic.

Claims

1. Aqueous two-component adhesion promoter composition composed of

a first component K1 comprising

at least one organoalkoxysilane S and

at least one anhydrous surfactant T;

and of a second component K2 comprising

at least water and

at least one acid;

and the acid being present in an amount such that after components K1 and K2 have been mixed the resulting mixture gives an acidic reaction.

2. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the acid is an organic acid, in particular a sulphonic acid or carboxylic acid, especially acetic acid or formic acid.

3. Aqueous two-component adhesion promoter composition according to claim 2, characterized in that the acid is preferably an aromatic sulphonic acid, especially p-toluenesulphonic acid or dodecylbenzylsulphonic acid.

4. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the acid is an inorganic acid, especially an acid having a sulphur atom or phosphorus atom.

5. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the acid is present in an amount such that, after components K1 or K2 have been mixed, the resulting mixture has a pH of between 3 and 5.

6. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the organoalkoxysilane S is an aminosilane.

7. Aqueous two-component adhesion promoter composition according to claim 6, characterized in that the aminosilane is an aminosilane of the formula (I) or a reaction product of an aminosilane of the formula (I) with a compound containing at least one functional group which reacts with primary or secondary amino groups

where R¹ is an alkyl group having 1 to 8 C atoms, preferably a methyl group or an ethyl group, in particular 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, in particular a methyl group or an ethyl group,

R³ is a linear or branched alkylene group having 1 to 4 C atoms, in particular a propylene group,

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

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

and a is the value 0, 1 or 2, in particular 0 or 1, preferably 0.

8. Aqueous two-component adhesion promoter composition according to claim 7, characterized in that aminosilane is selected from the group comprising aminosilanes of the formula (III), (IV) and (V)

9. Aqueous two-component adhesion promoter composition according to claim 7, characterized in that the aminosilane is a reaction product of an aminosilane of the formula (III) or (IV) as described in claim 8 with a compound containing epoxy groups.

10. Aqueous two-component adhesion promoter composition according to claim 9, characterized in that the compound containing epoxy groups is an epoxysilane, in particular an epoxysilane of the formula (VI)

11. Aqueous two-component adhesion promoter composition according to claim 7, characterized in that a=0 and R² is methyl and R⁵ is propylene.

12. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that organoalkoxysilane S is an organoalkoxysilane of the formula (XIV)

where R^1′

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

R^6′

is an alkyl group having 1 to 5 C atoms, preferably a methyl group or an ethyl group or an isopropyl group, in particular a methyl group or an ethyl group,

R^3′

is a linear or branched alkyl chain having 1 to 20 C atoms which is optionally substituted by an epoxy, or vinyl or (meth)acrylate group;

and a is the value 0, 1 or 2, in particular 0 or 1, preferably 0.

13. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the weight fraction of organoalkoxysilane S is ≧

40% by weight, based on the weight of component K1.

14. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the weight ratio of organoalkoxysilane S to anhydrous surfactant T(S:

T) has a value of 20;

1 to 1;

2, in particular 5;

1 to 1;

2, preferably 3;

1 to 2;

3.

15. Aqueous two-component adhesion promoter composition according to claim 1, characterized in that the weight fraction of water is ≧

60% by weight, based on the weight of component K2.

16. Packaging (6) consisting of

a pack (5) which has two chambers (1, 2) separated from one another by at least one dividing wall (3);

and

an aqueous two-component adhesion promoter composition according to claim 1,

the first component K1 being present in the first chamber (1) and the second component K2 being present in the second chamber (2).

17. Packaging (6) according to claim 16, characterized in that the dividing wall (3) is manufactured from a material which ruptures or tears as a result of the application of pressure.

18. Aqueous composition obtained by mixing components K1 and K2 of an aqueous two-component adhesion promoter composition according to claim 1.

19. Use of an aqueous two-component adhesion promoter composition according to or of an aqueous composition according to claim 18 as a pre-treatment agent for improving the adhesion of an adhesive or sealant applied thereto.

20. Method of substrate surface pre-treatment, comprising the steps of

a) mixing components K1 and K2 of a two-component adhesion promoter composition according to claim 1

b) applying the resulting mixture to a substrate surface.

21. Method of adhesive bonding or of sealing, comprising the steps of

i) mixing components K1 and K2 of a two-component adhesion promoter composition according to claim 1

ii) applying the resulting mixture to a substrate S1 to be bonded or sealed

iii) applying adhesive or sealant to the flashed-off aqueous adhesion promoter composition located on the substrate S1

iv) contacting the adhesive or sealant with a second substrate S2;

or

i′

) mixing components K1 and K2 of a two-component adhesion promoter composition according to claim 1

ii′

) applying the resulting mixture to a substrate S1 to be bonded or sealed

iii′

) applying adhesive or sealant to the surface of a second substrate S2

iv′

) contacting the adhesive or sealant with the flashed-off aqueous adhesion promoter composition located on the substrate S1;

or

i″

) mixing components K1 and K2 of a two-component adhesion promoter composition according to claim 1

ii″

) applying the resulting mixture to a substrate S1 to be bonded or sealed

iii″

) flashing off the two-component adhesion promoter composition

iv″

) applying adhesive or sealant between the surfaces of the substrates S1 and S2,

the second substrate S2 consisting of the same material as or different material from the substrate S1.

22. Method according to claim 21, characterized in that step iv) or iv′

) or iv″

) is followed by a step v) of curing of the adhesive or sealant.

23. Method according to claim 21, characterized in that the adhesive is a moisture-curing one-component polyurethane adhesive.

24. Adhesively bonded or sealed article obtained by a method according to claim 21.

25. Adhesively bonded or sealed article according to claim 24, characterized in that the article is a means of transport, in particular a car, or a component for mounting on a means of transport, in particular a car.