Polyurethane foam-forming compositions containing polysilsesquioxane cell opening agents
View Patent ↗The present invention relates to polyurethane foam-forming composition containing polysilsesquioxanes that provide high resilience flexible polyurethane molded foams having improved foam dimensional stability.
1. A foam-forming composition comprising:
a) at least one polyol;
b) at least one polyisocyanate;
c) at least one polyurethane catalyst;
d) at least one blowing agent;
e) at least one non-reactive polyorganosilsesquioxane having a spherical structure and an average particle of about 12 μm or less wherein the organo group is methyl, an alkyl containing 2 to 18 carbon atoms, phenyl, vinyl, cyclohexyl or combinations thereof; and, optionally,
f) at least one component selected from the group consisting of, surfactant, chain extender, crosslinker, filler, reinforcement, pigment, tint, dye, colorant, flame retardant, antioxidant, antiozonant, UV stabilizer, anti-static agent, biocide and biostat.
2. The composition of claim 1 wherein the polyol (a) is at least one selected from the group consisting of polyether polyol, grafted polyether polyol polyester polyol, polycaprolactone polyol, polycarbonate polyol, polybutadiene polyol, hydroxyl-terminated polyolefin polyols, graphed polyol and polyols derived from a natural source.
3. The composition of claim 1 wherein the polyisocyanate (b) is at least one selected from the group consisting of methanediphenyl diisocyanate (MDI), polymeric MDI, modified MDI, prepolymers of MDI, toluenediisocyanate (TDI), prepolymers of TDI and modified TDI.
4. The composition of claim 1 wherein the polyisocyanate (b) is at least one selected from the group consisting of methanediphenyl diisocyanate (MDI), polymeric MDI, modified MDI, and prepolymers of MDI.
5. The composition of claim 1 wherein the polyisocyanate (b) is at least one selected from the group consisting of toluenediisocyanate (TDI), prepolymers of TDI and modified TDI.
6. The composition of claim 1 wherein the catalyst is at least one selected from the group consisting of organometallic catalysts, alkali metal carboxylates catalysts, heavy metal-based catalysts and tertiary amine urethane catalysts.
7. The composition of claim 1 wherein the polyorganosilsesquioxane is a polyalkyl silsesquioxane.
8. The composition of claim 7 wherein the polyorganosilsesquioxane is at least one selected from the group consisting of polymethyl silsesquioxanes, polyphenyl silsesquioxanes, polyphenyl-methyl silsesquioxanes, phenyl silsesquioxane-dimethyl siloxane copolymers in solid or liquid form, polyphenyl-vinyl silsesquioxanes, polycyclohexyl silsesquioxanes, and polycyclopentyl silsesquioxanes.
9. The composition of claim 1 wherein the polyorganosilsesquioxane is polymethylsilsesquioxane.
10. The composition of claim 1 wherein the polyorganosilsesquioxane has an average particle size that ranges from 0.5 μm to 12 μm.
11. The composition of claim 1 wherein the polyorganosilsesquioxane has an average particle size that ranges from 2.0 μm to 8 μm.
12. The composition of claim 1 wherein the polyorganosilsesquioxane has an average particle size that is less than 2.0 μm.
13. The composition of claim 1 wherein the polyorganosilsesquioxane is present in the polyurethane foam-forming composition in an amount from 0.001 to 10 pphp.
14. The composition of claim 1 wherein the polyorganosilsesquioxane is present in the polyurethane foam-forming composition in an amount from 0.01 to 0.05 pphp.
15. The composition of claim 1 wherein the polyorganosilsesquioxane is present in the polyurethane foam-forming composition in an amount from 0.03 to 0.05 pphp.
16. A polyurethane foam prepared from the composition of claim 1 .
17. The foam of claims 16 wherein the polyurethane foam is a flexible high resilience polyurethane foam or a viscoelastic polyurethane foam.
18. The foam of claim 17 wherein the foam has a density of about 20 kg/m 3 to about 60 kg/m 3 .
19. The foam of claim 17 wherein the foam has a Force-to-Crush of about 50 Newtons to about 2000 Newtons, wherein the Force-to-Crush is the peak force required to deflect a foam pad with the dimensions of 300 mm×300 mm×100 mm to 75% of its original thickness using a Zwick Materials Testing machine, one minute after demold in accordance with ASTM 0-3574.
20. The foam of claim 17 wherein the foam has a Hot Indentation Loading Deflection of about 100 Newtons to about 1500 Newtons, wherein the Hot Indentation Loading Deflection is the peak force required to deflect a crushed foam pad with the dimensions of 300 mm×300 mm×100 mm to 75% of its original thickness using a Zwick Materials Testing machine, the same foam pad used in the force-to-Crush test in accordance with ASTM 0-3574.