Slush molding composition
View Patent ↗A thermoplastic polypropylene composition comprising polypropylene, a hydrogenated block copolymer, 3 to 6 wt % high density polyethylene, a processing oil, and greater than or equal to 3 wt % of a surface modifier comprising an ultra high molecular weight polydialkyl siloxane, an ultra-high molecular weight polydialkyl siloxane in combination with silica, a polyolefin siloxane or a combination thereof, wherein weight percent is based on the total weight of the composition.
1. A thermoplastic polypropylene composition comprising polypropylene, a hydrogenated block copolymer, 3 to 6 weight percent high density polyethylene, a processing oil, and greater than or equal to 3 weight percent of a surface modifier comprising an ultra-high molecular weight polydialkyl siloxane, an ultra-high molecular weight polydialkyl siloxane in combination with silica, a polyolefin siloxane or a combination thereof, wherein weight percent is based on the total weight of the composition.
2. The composition of claim 1 , wherein the polypropylene comprises a copolymer.
3. The composition of claim 1 , wherein the polypropylene has a melt flow rate of 60 to 1200 grams per 10 minutes as determined according to ASTM D1238 using either powdered or pelletized polypropylene, a load of 2.16 kilograms and a temperature of 230° C.
4. The composition of claim 1 , wherein the polypropylene is present in an amount of 20 to 30 weight percent, based on the total weight of the composition.
5. The composition of claim 1 , wherein the hydrogenated block copolymer has an alkenyl aromatic content of 1 to about 30 weight percent based on the total weight of the hydrogenated block copolymer.
6. The composition of claim 1 , wherein the hydrogenated block copolymer is present in an amount of 50 to 60 weight percent, based on the total weight of the composition.
7. The composition of claim 1 , wherein the surface modifier comprises an ultra-high molecular weight polydialkyl siloxane in combination with silica.
8. The composition of claim 1 , wherein the hydrogenated block copolymer comprises a combination of a styrene-(ethylene-butylene)-styrene copolymer and a styrene-(ethylene-propylene)-styrene copolymer.
9. A thermoplastic polypropylene composition comprising 20 to 30 weight percent polypropylene, 50 to 60 weight percent a hydrogenated block copolymer, 3 to 6 weight percent high density polyethylene, a processing oil, and greater than or equal to 3 weight percent of a surface modifier comprising an ultra-high molecular weight polydialkyl siloxane in combination with silica, wherein weight percent is based on the total weight of the composition.
10. The composition claim 9 , wherein the hydrogenated block copolymer comprises a combination of a styrene-(ethylene-butylene)-styrene copolymer and a styrene-(ethylene-propylene)-styrene copolymer.
11. A method of making an article comprising slush molding a thermoplastic polypropylene composition comprising polypropylene, a hydrogenated block copolymer, 3 to 6 weight percent high density polyethylene, a processing oil, and greater than or equal to 3 weight percent of a surface modifier comprising an ultra-high molecular weight polydialkyl siloxane, an ultra-high molecular weight polydialkyl siloxane in combination with silica, a polyolefin siloxane or a combination thereof, wherein weight percent is based on the total weight of the composition.
12. The composition of claim 11 , wherein the polypropylene comprises a copolymer.
13. The composition of claim 11 , wherein the polypropylene has a melt flow rate of 60 to 1200 grams per 10 minutes as determined according to ASTM D1238 using either powdered or pelletized polypropylene, a load of 2.16 kilograms and a temperature of 230° C.
14. The composition of claim 11 , wherein the polypropylene is present in an amount of 20 to 30 weight percent, based on the total weight of the composition.
15. The composition of claim 11 , wherein the hydrogenated block copolymer has an alkenyl aromatic content of 1 to about 30 weight percent based on the total weight of the hydrogenated block copolymer.
16. The composition of claim 11 , wherein the hydrogenated block copolymer is present in an amount of 50 to 60 weight percent, based on the total weight of the composition.
17. The composition of claim 11 , wherein the surface modifier comprises an ultra-high molecular weight polydialkyl siloxane in combination with silica.
18. The composition of claim 11 , wherein the hydrogenated block copolymer comprises a combination of a styrene-(ethylene-butylene)-styrene copolymer and a styrene-(ethylene-propylene)-styrene copolymer.
19. The composition of claim 11 , wherein the high density polyethylene comprises a homopolyethylene.
20. The composition claim 11 , wherein the high density polyethylene comprises a polyethylene copolymer.