Aqueous adhesive composition based on epoxy resin with improved adhesion and storage stability
AssigneeSika Technology AG
InventorAntonio Corsaro
Life of this patent
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Abstract
An aqueous adhesion composition comprising: a) at least one dispersed solid epoxy resin (EP); b) at least one amino silane (AS); c) at least one acid (HS); d) at least one amine hardener (AH); and e) water. According to the invention, the adhesion compositions substantially improve, particularly under humid conditions, the adhesion on different substrates. The compositions are storage stable for a longer period of time and have, even after different aging states of the components, essentially no impairment in the action thereof.
Claims14
An aqueous adhesion promoter composition, the adhesion promoter composition being formulated as a two-component composition that comprises a first component KA and a second component KB;
- wherein
- the first component KA is separate from the second component KB;
- the first component KA comprises:
- a) at least one dispersed solid epoxy resin EP,
- b) at least one aminosilane AS,
- c) at least one acid HS, and
- e) water;
- and
- the second component KB comprises:
- a) at least one amine hardener AH,
- b) at least one inorganic base BA, and
- c) water.
An adhesion promoter composition that consists of a single component KAB, the single component KAB being a composition that is made of:
- a) at least one dispersed solid epoxy resin EP;
- b) at least one aminosilane AS;
- c) 0.1 to 5 wt % of at least one acid HS, the at least one acid HS being an acid selected from the group consisting of water-soluble carboxylic acids CHS;
- d) at least one amine hardener AH;
- and
- e) water.
Dependencies are inferred from the claim text.