| abstract |
(57) [Summary]nPROBLEM TO BE SOLVED: To provide a resin premix of hydrophobic silica-based fine particles. Without separation from the resin premix It can be stored stably without deterioration due to amine catalyst, and Polyurethane that gives polyurethane foam with excellent process stability Provided is a method for producing urethane foam.nSOLUTION: The polyurethane foam is made of polyurethane Curing of foam composition, resin premix during foaming Manufactured by adding hydrophobic silica-based fine particles You. Hydrophobic silica-based fine particles include, for example, R 1 Three Si0 1/2 single Position (however, R 1 Are the same or different monovalent carbons having 1 to 6 carbon atoms Hydride group), R Two Si0 3/2 Unit (however, R Two Is 1 carbon ~ 20 monovalent hydrocarbon groups), Si0 Two Particle size consisting of 0.1 １1 micron means Si0 Two Unit consisting of fine silica particles R on the child surface Two Si0 3/2 Unit (however, R Two Is carbon number 1-2 Represents a monovalent hydrocarbon group of 0. ) Is introduced and the obtained fine particles R on the child surface 1 Three Si0 1/2 Unit (however, R 1 Are the same or different Represents a monovalent hydrocarbon group having 1 to 6 carbon atoms. ) It can be obtained by: |