Reactive adhesives based on block copolymers
AssigneeEvonik Operations GmbH
InventorsNicolai Kolb, Gabriele Brenner, Bernhard Schleimer
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Abstract
The present invention relates to a composition comprising the reaction product of a block copolymer based on OH-functional polyolefin which is unhydrogenated, preferably polybutadiene, and cyclic esters in the form of a polyol having at least 1.8, preferably at least two, OH groups and at least one isocyanate compound having at least two isocyanate groups, which is notable in that the composition includes at least 0.0001% to 40% by weight of titanium and has a content of free isocyanate groups of at least 0.1% by weight based on the overall composition, to a process for preparation thereof and to the use of the composition for bonding of substrates.
Claims20
A composition comprising the reaction product of a block copolymer based on OH-functional polyolefins, which are unhydrogenated and cyclic esters in the form of a polyol having at least 1.8 OH groups and at least one isocyanate compound having at least two isocyanate groups, wherein the composition includes at least 0.0001% to 40% by weight of titanium and has a content of free isocyanate groups of at least 0.1% by weight based on the overall composition, wherein the titanium is in the form of titanium tetramethoxide, titanium tetraethoxide, titanium tetrapropoxide, titanium tetraisopropoxide, titanium tetra-n-butoxide, titanium tetra-t-butoxide, titanium tetraphenoxide, titanium oxide acetylacetonate, titanium acetylacetonate or titanium dialkoxide based on diols.
A process for preparing a reaction product of a block copolymer based on OH-functional polyolefin which is in unhydrogenated form and a cyclic ester in the form of a polyol having at least 1.8 OH groups and at least one isocyanate compound having at least two isocyanate groups, wherein the reaction is effected in the presence of a titanium-comprising catalyst and a sufficient amount of isocyanate compound is used that the ratio of OH groups to isocyanate groups is from 1:1.1 to 1:5, wherein the titanium is in the form of titanium tetramethoxide, titanium tetraethoxide, titanium tetrapropoxide, titanium tetraisopropoxide, titanium tetra-n-butoxide, titanium tetra-t-butoxide, titanium tetraphenoxide, titanium oxide acetylacetonate, titanium acetylacetonate or titanium dialkoxide based on diols.
Dependencies are inferred from the claim text.