POLYISOCYANATE COMPONENT, POLYURETHANE FOAM SYSTEM AND ARTICLE MADE THEREFROM Russian patent published in 2022 - IPC C08G18/58 C08J9/00 C08G101/00 

FIELD: chemistry.

SUBSTANCE: present invention relates to a polyisocyanate component, a polyurethane foam system for making rigid polyurethane foam and a method of using the polyisocyanate component. Polyisocyanate component contains a premix containing an aromatic oxazolidone compound, which is a reaction product of at least one epoxy compound having at least one aromatic group, and at least one first polyisocyanate compound having an average isocyanate functionality of not more than 2.7 and more than 1.8. Said reaction takes place in the presence of at least one catalyst. Aromatic oxazolidone compound contains at least one free isocyanate group and at least one aromatic oxazolidone group, the aromatic oxazolidone group contains an aromatic group and an oxazolidone group. Polyisocyanate component has viscosity of not more than 4.0 Pa⋅with at 25 °C, the content of aromatic oxazolidone groups ranges from 2 to 10 wt. % based on the total weight of the polyisocyanate component, and the average isocyanate functionality ranges from 1.8 to 6.0.

EFFECT: rigid polyurethane foams have improved insulating properties and improved mechanical properties.

10 cl, 5 tbl, 3 ex