US 12,623,998 B2 · Process for preparing a polyisocyanate, polyisocyanate, its use and polyaddition products prepared therefrom

Abstract

The present invention relates to a process for preparing a polyisocyanate, namely an isocyanate group-terminated polyol polyanthranilic acid ester. The process comprises the step of reacting an anthranilic acid derivative selected from anthranilic acid halide (in particular anthranilic acid chloride), isatoic anhydride or a mixture thereof with a first polyol of a number-average molar mass of at least 200 g/mol and a functionality in the range of 2 to 8, and obtaining, as a result, a polyamine (namely a polyol polyanthranilic acid ester with amine terminal groups) and reacting the polyamine with phosgene and obtaining, as a result, a polyisocyanate (namely an isocyanate group-terminated polyol polyanthranilic acid ester). The invention further relates to the polyisocyanates obtained in this way, their use in polyaddition reactions, and polyaddition products obtainable by these reactions.

Claims15

Dependent claims

A process for preparing a polyisocyanate comprising:

(A) reacting an anthranilic acid derivative comprising anthranoyl halide, isatoic anhydride or a mixture thereof with a first polyol of functionality b and the general formula X—(OH)b, where b has a value of 2 to 8 and X is a radical that derives from the first polyol by removal of all alcohol groups, and where the first polyol has a number-average molar mass of at least 200 g/mol, to obtain a polyamine of the formula
in which a=b−1;
and
(B) reacting the polyamine with phosgene to obtain a polyisocyanate of the formula

1 more element

Dependencies are inferred from the claim text.

Process for preparing a polyisocyanate, polyisocyanate, its use and polyaddition products prepared therefrom

Life of this patent

Process for preparing a polyisocyanate, polyisocyanate, its use and polyaddition products prepared therefrom

Life of this patent

Abstract

Claims15