Polymer containing silane groups
AssigneeSika Technology AG
InventorsAndreas Kramer, Urs Burckhardt, Ursula Stadelmann
Life of this patent
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Abstract
The invention relates to polymers containing silane groups, to a method for their production and to their use as a component of curable compositions, in particular of moisture-curing sealants, adhesives or coatings that can be applied at ambient temperature, or of hot-melt adhesives containing silane groups. The polymers containing silane groups are obtained in particular by means of a special hydroxysilane which can be produced in particular from the reaction of lactides with aminosilanes.
Claims16
A polymer having end groups of the formula (I)
- where
- R1a is a methyl radical;
- R1b is a hydrogen atom;
- R2 is a hydrogen atom or a monovalent hydrocarbyl radical which has 1 to 12 carbon atoms and optionally contains ether groups, ester groups, nitrile groups, amino groups or silane groups;
- R3 is a linear or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, optionally having aromatic moieties, and optionally having one or more heteroatoms;
- R4 is an alkyl radical having 1 to 8 carbon atoms;
- R5 is an alkyl radical which has 1 to 10 carbon atoms and optionally contains ether groups;
- and
- x is 0, 1 or 2.
A process for preparing a polymer having end groups of the formula (I)
- where
- R1a and R1b are each independently a hydrogen atom or a monovalent hydrocarbyl radical having 1 to 12 carbon atoms, or together are an alkylene radical having 2 to 6 carbon atoms;
- R2 is a hydrogen atom or a monovalent hydrocarbyl radical which has 1 to 12 carbon atoms and optionally contains ether groups, ester groups, nitrile groups, amino groups or silane groups;
- R3 is a linear or branched alkylene or cycloalkylene radical having 1 to 20 carbon atoms, optionally having aromatic moieties, and optionally having one or more heteroatoms;
- R4 is an alkyl radical having 1 to 8 carbon atoms;
- R5 is an alkyl radical which has 1 to 10 carbon atoms and optionally contains ether groups;
- and
- x is 0, 1 or 2,
- the method comprising reacting:
- at least one polyol,
- at least one diisocyanate,
- either at least one lactide of the formula (II) or at least one hydroxy ester of the formula (III), and
- at least one aminosilane of the formula (IV) with one another,
- where
- m is an integer from 1 to 100;
- and
- R6 is a monovalent hydrocarbyl radical having 1 to 12 carbon atoms.
Dependencies are inferred from the claim text.