Moisture-curing composition and hot-melt adhesive
AssigneeBayer MaterialScience AG
InventorsMatthias Wintermantel, Walter Meckel, Michael Ludewig
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Abstract
The invention relates to a composition based on alkoxysilane-functional polyurethane prepolymers suitable for a reactive hot-melt adhesive which is stable to storage at a high temperature but cures very rapidly under the action of moisture from the atmosphere or from the materials glued to one another and which is suitable for joining the most diverse materials. The invention also relates to the process for gluing the most diverse substrates using the reactive hot-melt adhesive according to the invention.
Claims10
Alkoxysilane-functional composition, obtained by reaction of
- A) polyurethane prepolymers obtained by reaction of
- i) at least one aromatic, aliphatic, araliphatic and/or cycloaliphatic diisocyanate
- with
- ii) at least one polyol comprising at least one linear polyester polyol which is solid at room temperature,
- wherein the ratio of amounts of i) to ii) is chosen such that the molar ratio of NCO to OH is from 1.2 to 4.0,
- with
- B) compounds containing alkoxysilane and amino or mercapto groups, of the general formula (I)
- in which
- X, Y and Z represent identical or different straight-chain or branched (C1-C8)alkyl radicals or cyclic (C3-C8)alkyl radicals or (C1-C8)alkoxy radicals, with the proviso that at least one of the radicals is a (C1-C8)alkoxy radical,
- R represents straight-chain or branched alkylene radicals having 1 to 8 carbon atoms or cyclic alkylene radicals having 3 to 8 carbon atoms,
- W represents either —SH or —NH—R′
- wherein
- R′ represents hydrogen, straight-chain or branched alkyl radicals having 1 to 8 carbon atoms or cyclic alkyl radicals having 3 to 8 carbon atoms or aryl radicals or radicals of the general formula (II)
- wherein
- R″ and R′″ represent identical or different straight-chain or branched alkyl radicals having 1 to 8 carbon atoms or cyclic alkyl radicals having 3 to 8 carbon atoms
- wherein the ratio of amounts of A) to B) is chosen such that 0.95 to 1.1 mol of amino or mercapto groups from B) are employed per mol of NCO groups from A),
- and addition of
- C) bis-(N,N′-dimethylaminoethyl) ether.
Process for the preparation of the alkoxysilane-functional compositions obtained by preparation of
- A) polyurethane prepolymers obtained by reaction of
- i) at least one aromatic, aliphatic, araliphatic and/or cycloaliphatic diisocyanate
- with
- ii) at least one polyol comprising at least one linear polyester polyol which is solid at room temperature,
- wherein the ratio of i) to ii) is chosen such that the molar ratio of NCO to OH is from 1.2 to 4.0,
- and reaction of the polyurethane prepolymers obtained under A) with
- B) compounds containing alkoxysilane and amino or mercapto groups, of the general formula (I)
- in which
- X, Y and Z represent identical or different straight-chain or branched (C1-C8)alkyl radicals or cyclic (C3-C8)alkyl radicals or (C1-C8)alkoxy radicals, with the proviso that at least one of the radicals is a (C1-C8)alkoxy radical,
- R represents straight-chain or branched alkylene radicals having 1 to 8 carbon atoms or cyclic alkylene radicals having 3 to 8 carbon atoms,
- W represents either —SH or —NH—R′
- wherein
- R′ represents hydrogen, straight-chain or branched alkyl radicals having 1 to 8 carbon atoms, cyclic alkyl radicals having 3 to 8 carbon atoms, aryl radicals or radicals of the general formula (II)
- wherein
- R″ and R′″ represent identical or different straight-chain or branched alkyl radicals having 1 to 8 carbon atoms or cyclic alkyl radicals having 3 to 8 carbon atoms
- wherein the ratio of amounts of A) to B) is chosen such that 0.95 to 1.1 mol of amino or mercapto groups from B) are employed per mol of NCO groups from A),
- and subsequent addition of
- C) bis-(N,N′-dimethylaminoethyl) ether.
Dependencies are inferred from the claim text.