Intermediate Polyisocyanurate Comprising Materials

摘要

A stable partly cured polyisocyanate composition is disclosed which comprises polyisocyanurate (intermediate polyisocyanurate comprising material) and which is further curable. Furthermore a process for making the intermediate (partly cured) polyisocyanurate comprising material and a process for further curing the partly cured polyisocyanurate composition is disclosed. Also polyisocyanurate comprising materials made or obtainable from partly cured intermediate polyisocyanurate comprising material are disclosed and processes for further curing a partly cured polyisocyanurate comprising composition (intermediate material).

主权项

1. A process for making a stable, intermediate and further curable polyisocyanurate comprising material which comprises free isocyanate (NCO) groups, has an NCO value of 5-30% by weight, and wherein the final concentration of the polyisocyanurate compounds does not change more than 10% from its initial value (calculated as a change in NCO value) when kept at room temperature (around 20° C.) and ambient pressure for at least 5 hours, which process comprises at least the steps of:
Providing a polyisocyanate composition, and then, Combining and mixing compounds which comprise a group having the structure —CO—NH2 to the polyisocyanate composition, and subsequently or simultaneously, Combining and mixing a trimerization catalyst compound to the polyisocyanate composition in such amount that the number of equivalents of compounds which comprise a group having the structure —CO—NH2 over the number of trimerization catalyst equivalents is below 4 and higher than 0.75, and then, Allowing the composition to react, and then, Optionally cooling down the composition.