Isocyanate-free primer composition for glass and glass ceramics
AssigneeSika Technology AG
InventorRaphael Teysseire
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Abstract
The invention relates to a primer composition comprising a compound A1 which contains isocyanate-reactive groups. In order to produce said compound A1, a polyisocyanate A that is provided with at least three isocyanate groups, at least one silane B of formula (I), and a crosslinking agent C comprising at least three isocyanate-reactive functional groups are used. Also disclosed is the use of the inventive primer composition as a primer for adhesives, sealing compounds, or floor coverings, especially one-component moisture-hardening polyurethane adhesives or polyurethane sealing compounds based on polyurethanes or polyurethane-silane hybrids. The inventive primer composition is characterized particularly by excellent adhesion to glass and glass ceramics as well as an extended open time.
Claims24
Primer composition comprising a silane-terminated compound of formula (VI) or (VII) comprising isocyanate-reactive groups
- wherein R″ represents a divalent residue;
- R1 represents methyl or ethyl,
- R2 represents a C1- to C4-alkyl or OR1,
- R3 represents H, a C1- to C4-alkyl or OR1,
- R4 represents R1, methyl or ethyl;
- R5 represents R2, H, C1- to C4-alkyl or OR4;
- and
- R6 represents R3, H, C1- to C4-alkyl or OR4.
Primer composition comprising a compound of formula (VI) or (VII) comprising isocyanate-reactive groups
- wherein
- R″ represents a divalent residue;
- R1 represents methyl or ethyl,
- R2 represents a C1- to C4-alkyl or OR1,
- R4 represents H, a C1- to C4-alkyl or OR1,
- R5 represents R1, methyl or ethyl;
- R5 represents R2, H, C1- to C4-alkyl or OR4;
- and
- R6 represents R3, H, C1- to C4-alkyl or OR4, the compound derived from a reaction of
- a product carrying isocyanate groups and formed from a reaction of polyisocyanate which has at least three isocyanate groups and at least a silane of the formula (I)
- and a silane of formula (I′)
- the reaction to form the product being conducted in a stoichiometric excess of isocyanate groups of the polyisocyanate with respect to the isocyanate-reactive groups of the silane of formula (I) and the silane of formula (I′);
- and
- a cross-linking agent having at least three isocyanate-reactive functional groups.
Dependencies are inferred from the claim text.