Metal-free silane-terminated polyurethanes, a process for their preparation and their use
AssigneeDegussa AG
InventorsHelmut Mack, Dieter Barfurth
Life of this patent
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Abstract
A metal-free, in particular tin-free, silane-terminated polyurethane which is useful in adhesives or sealant compositions is obtained by reacting at least one aliphatic secondary aminoalkylalkoxysilane of formula (Ia) R—NH—(CH2)3Si(R1)x(OR2)(3-X) (Ia) or at least one aliphatic secondary aminoalkylalkoxysilane of formula (Ib) R—NH—CH2—CH(R1)—CH2—Si(R1)x(OR2)(3-X) (Ib) wherein in the formulae (Ia) and (Ib), R is a linear or branched alkyl group having 1 to 18 C atoms, R1 is a methyl group, R2 is a methyl or ethyl group and x is 0 or 1, with a polyurethane prepolymer having at least one terminal isocyanate group in the absence of a metal catalyst.
Claims13
A metal-free silane-terminated polyurethane, obtained by reacting at least one aliphatic secondary aminoalkylalkoxysilane of formula (Ia)
- R—NH—(CH2)3Si(R1)(OR2)2 (Ia)
- or at least one aliphatic secondary aminoalkylalkoxysilane of formula (Ib)
- R—NH—CH2—CH(R1)—CH2—SiR1(OR2)2 (Ib)
- wherein in formulae (Ia) and (Ib), R is a linear or branched or cyclic alkyl group having 1 to 18 C atoms, R1 is a methyl group, R2 is a methyl or ethyl group,
- with a polyurethane prepolymer in the absence of a metal catalyst;
- wherein the polyurethane prepolymer has at least one terminal isocyanate group.
A process for the preparation of a metal-free silane-terminated polyurethane, comprising:
- reacting at least one aliphatic secondary aminoalkylalkoxysilane of formula (Ia)
- R—NH—(CH2)3Si(R1)(OR2)2 (Ia)
- or at least one aliphatic secondary aminoalkylalkoxysilane of formula (Ib)
- R—NH—CH2—CH(R1)—CH2—SiR1(OR2)2 (Ib)
- wherein in the formulae (Ia) and (Ib), R is a linear or branched or cyclic alkyl group having 1 to 18 C atoms, R1 is a methyl group, R2 is a methyl or ethyl group
- with a polyurethane prepolymer in the absence of a metal catalyst;
- wherein the polyurethane prepolymer carries at least one terminal isocyanate group.
Dependencies are inferred from the claim text.