METHOD OF PRODUCING POLYURETHANE FOAM USING BLOWING AGENT IN SUPERCRITICAL OR NEAR-CRITICAL STATE Russian patent published in 2015 - IPC C08G18/00 C08G18/66 B29C44/02 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing polyurethane foam, wherein the blowing agent used is in supercritical state. Described is a method of producing polyurethane foam which includes the following steps: - preparing a mixture which includes: A) a component capable of reacting with isocyanates; B) a detergent component (surfactant); C) a blowing agent selected from a group comprising linear, branched or cyclic alkanes with 1-6 carbon atoms, linear, branched or cyclic fluoroalkanes with 1-6 carbon atoms, N₂, O₂, argon and/or CO₂, wherein the blowing agent (C) is in supercritical or near-critical state; D) a polyisocyanate component; - feeding the mixture comprising components A), B), C) and D) into a closed mould, the closed mould being built such that its internal volume and/or its internal pressure can be varied externally after feeding the mixture; - holding the mixture comprising components A), B), C) and D) in the closed mould for a predetermined time of not less than 0 s; and increasing the internal volume of the closed mould and/or reducing pressure inside the closed mould under an external action. Also described is polyurethane foam obtained using said method.

EFFECT: obtaining polyurethane foam with small cell size.

15 cl, 4 ex, 9 dwg