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US 7,247,679 B2Granted
Hetero phase polymer compositions
AssigneeExxonMobil Chemical Patents Inc.
InventorsSudhin Datta, Narayanaswami Raja Dharmarajan, Prasadarao Meka
Life of this patent
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Abstract
Hetero phase polymer compositions are described. The compositions may have polypropylene component, a modifier component and a compatibilizer component. The modifier component may in some embodiments be an ethylene α-olefin copolymer with a density ≧0.905 g/cm3. In other embodiments the modifier component may be a blend of a copolymer with a density of ≧0.905 g/cm3, and an ethylene α-olefin copolymer of lower, more traditional density.
Claims34
A hetero phase polymeric composition, comprising:
- a) a polypropylene component, present in said hetero phase polymer composition as a continuous phase, said polypropylene component having a melting point, Tm≧110° C.;
- b) a modifier component, said modifier component being a dispersed phase in said hetero phase polymer composition, said modifier component including at least 10 percent by weight of the total modifier component being an ethylene α-olefin polymer having a density≧0.905 g/cm3, and said modifier component having from 0 to 10% propylene crystallinity;
- c) a compatibilizer component, present in said hetero phase polymer composition in a compatibilizing amount, said compatibilizer component having a ΔHf<45 J/g, said compatibilizer component having propylene sequences co-crystallizable with the polypropylene component of a).
A two phase polymer blend comprising:
- a) a polypropylene component present as a continuous phase, said polypropylene component having a Tm>110° C. or a ΔHf>60 J/g, and wherein said polypropylene component has crystallinity from one of isotactic or syndiotactic sequences;
- b) a modifier component, present in said polymer blend at ≦10 weight percent, based on the total polymer weight of said blend, said modifier component having a density in the range of from 0.85–0.965 g/cm3 and being substantially free of propylene crystallinity;
- and
- c) a compatibilizer component, present in said blend at a compatibilizing amount, said compatibilizer component having a ΔHf<45 J/g, said compatibilizer component having propylene sequences that co-crystallize with the polypropylene component of a).
1 more element
A two phase polymer composition, comprising:
- a) an impact copolymer of propylene (ICP), said ICP having one or more of Tm>140° C., ΔHf>95 J/g, or an α-olefin content of one of >2 or <25 weight percent, a molecular weight in the range of from 10,000–5,000,000, a melt flow rate in the range of from 15–60 dg/min., said ICP present in said two phase polymer composition in the range of from 70–90 weight percent;
- b) an ethylene α-olefin copolymer, wherein said α-olefin is one or more of butene-1, hexene-1, or octene-1, said ethylene copolymer having a density ≧0.905 g/cm3, said ethylene copolymer may be a blend of two or more ethylene α-olefin copolymers, and if a blend, the aggregate density is ≧0.905 g/cm3, said ethylene α-olefin copolymer being present in said two phase polymer composition in the range of from 15–22 weight percent, having an melt index in the range of from 0.1–10 g/10 minutes, and wherein said ethylene α-olefin copolymer has from 0 to 10% propylene crystallinity;
- c) a compatibilizer component present in said two phase polymer composition in the range of 0.1–8 weight percent, said compatibilizer component is a polymer of propylene and one or more of ethylene, butene-1, hexene-1, or octene-1, said compatibilizer component has a crystallinity defined by one of Tm<100° C., or a ΔHf<25 J/g, wherein said compatibilizer component has a narrow compositional distribution, such that >75 wt. % of the compatibilizer component may be isolated in a thermal fractionation, in 2 adjacent soluble fractions, where each fraction differs <20% from the average weight present α-olefin of the total compatibilizer component.
A hetero phase polymeric composition, comprising:
- a) a polypropylene component present in said hetero phase polymer composition as a continuous phase, said polypropylene component having a melting point Tm≧100° C.;
- b) a modifier component, said modifier component being a dispersed phase in said hetero phase polymer composition, and comprising at least 10 % by weight of the total modifier component of an polymer derived from ethylene and an alpha-olefin having from 4 to 20 carbon atoms with a density of at least 0.88 g/cm3 and a CDBI of at least 50 %, said modifier component having from 0 to 10% propylene crystallinity;
- c) a compatibilizing amount of a compatibilizer component, derived to an extent of at least 50 mole % of propylene compatibilizer component and having a ΔHf<45 J/g which is co-crystallizable with the polypropylene component.
Dependencies are inferred from the claim text.