Two-component polyurethane filler having an adjustable pot life

Abstract

The present invention relates to a polyol composition consisting of a first component and a second component, wherein the first component contains a polyol having had OH functionality in the range from 1.5 to 4 and an average molecular weight in the range from 250 to 15'000 g/mol, a diol having at least two hydroxyl groups joined via a C2 to C9 carbon chain, and a compound having at least one thiol group. In addition, one of the two components additionally comprises at least one metal catalyst for the reaction of hydroxyl groups and isocyanate groups which is capable of forming thio complexes, and where the molar ratio of all NCO groups of the polyisocyanates I to all OH groups of the polyols=0.9:1-1.4:1, especially 1.05:1-1.3:1, and where the composition contains, in at least one of the two components, between 3% and 25% by weight, based on the overall composition, of at least one type of microscopic hollow beads, wherein the microscopic hollow beads have a compressive strength, measured to ASTM D3102-72, of at least 10 MPa and a density of at least 0.2 kg/L, and wherein the composition contains, in at least one of the two components, between 2.5% and 7.5% by weight, based on the overall composition, of at least one desiccant, wherein the desiccant is an aluminosilicate. Such a composition permits arbitrary adjustment of the open time within particular limits, and enables achievement of long open times with subsequent very rapid curing of the composition. The composition of the invention has excellent strength and hardness, and is grindable without difficulty. The composition of the invention is particularly suitable as filling compound, especially for wood.

Dependencies are inferred from the claim text.