Composition comprising polypropylene for injection stretch blow molding, methods of making and using the same
AssigneeBraskem America, Inc.
InventorsKevin Herrington, Kimberly Miller McLoughlin
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Abstract
A composition comprising polypropylene having a high melt strength suitable for an injection stretch blow molding (ISBM) process is provided. Such a composition includes a polypropylene (PP) copolymer having a branched structure. The PP copolymer is a random copolymer derived from propylene and at least one comonomer selected from ethylene, any C4-C8 alpha-olefin, or any combinations thereof. The composition has a melt flow index in a range of from 8 g/10 minutes to 30 g/10 minutes. A resulting fabricated article, a method of making the composition, and a method of using the composition are also provided.
Claims19
A composition comprising a polypropylene (PP) copolymer having a branched structure as the only polypropylene in the composition, the PP copolymer being a random copolymer derived from propylene and at least one comonomer selected from the group consisting of ethylene, any C4-C8 alpha-olefin, and combinations thereof,
- wherein the composition has a melt flow index in a range of from 10 g/10 minutes to 30 g/10 minutes according to and measured per ASTM D1238 using a load of 2.16 kg at 230° C.,
- wherein the composition is suitable for an injection stretch blow molding (ISBM) process, and
- wherein the composition is made by mixing the random copolymer derived from propylene and the at least one comonomer with a poly(sulfonyl azide) at an elevated temperature, or by branching or crosslinking the random copolymer derived from propylene and the at least one comonomer using a peroxide, an acrylate, a siloxane, a second polymer having vinyl functional groups, or e-beam.
Dependencies are inferred from the claim text.