Method for producing polymer-dispersed polyol
View Patent ↗To provide a method for producing a polymer-dispersed polyol which has high compatibility with a polyol for rigid polyurethane foams and is excellent in storage stability and which provides good heat-insulating performance when it is formed into a rigid polyurethane foam. Also a method for producing a polymer-dispersed polyol for rigid polyurethane foams, having polymer particles dispersed in a polyol, which comprises polymerizing a monomer having a polymerizable unsaturated group in a polyol (X), wherein the polyol (X) contains a polyether polyol (Y) having an oxyethylene group content of at least 10 mass %, and the monomer having a polymerizable unsaturated group contains a fluorinated acrylate or a fluorinated methacrylate.
1. A method for producing a polymer-dispersed polyol for rigid polyurethane foams, having polymer particles dispersed in a polyol, which comprises polymerizing a monomer having a polymerizable unsaturated group in a polyol (X), wherein the polyol (X) contains a polyether polyol (Y) having an oxyethylene group content of at least 10 mass %, and the monomer having a polymerizable unsaturated group contains a fluorinated acrylate or a fluorinated methacrylate.
2. The method for producing a polymer-dispersed polyol according to claim 1 , wherein the fluorinated acrylate or the fluorinated methacrylate is a monomer represented by the following formula (1):
wherein R f is a C 1-18 polyfluoroalkyl group, R is a hydrogen atom or a methyl group, and Z is a bivalent linking group.
3. The method for producing a polymer-dispersed polyol according to claim 1 , wherein the monomer having a polymerizable unsaturated group further contains at least one member selected from the group consisting of acrylonitrile, vinyl acetate and styrene.
4. The method for producing a polymer-dispersed polyol according to claim 1 , wherein the polyether polyol (Y) has an oxyethylene group content of at least 60 mass %.
5. The method for producing a polymer-dispersed polyol according to claim 1 , wherein the polyether polyol (Y) has a hydroxyl value of at most 84 mgKOH/g.
6. The method for producing a polymer-dispersed polyol according to claim 1 , wherein the polyether polyol (Y) is a polyoxyalkylene polyol obtained by addition-polymerizing propylene oxide and ethylene oxide to a polyhydric alcohol.
7. The method for producing a polymer-dispersed polyol according to claim 2 , wherein the proportion of the monomer represented by the formula (1) in the entire monomer having a polymerizable unsaturated group, is from 30 to 100 mass %.
8. The method for producing a polymer-dispersed polyol according to claim 2 , wherein the monomer represented by the formula (1) is one wherein R f is a C 3-8 polyfluoroalkyl group, and Z is an alkylene group or an arylene group.
9. The method for producing a polymer-dispersed polyol according to claim 2 , wherein the monomer represented by the formula (1) is any one of monomers represented by the following formulae (1-1) to (1-3):
10. The method for producing a polymer-dispersed polyol according to claim 1 , wherein the concentration of the polymer particles is from 1 to 50 mass %.