Polypropylene resins for multiple cavity stretch blow molding

Details Polypropylene resins for multiple cavity stretch blow molding Polypropylene resins for multiple cavity stretch blow molding

1992-02-19

1993-01-05

Hoke, Veronica P.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including application of internal fluid pressure to hollow...

264515, 264516, 264527, 524255, 524147, 524291, 524302, B29C 3902, C08K 5526, C08K 536, C08K 518, C08K 1306

Patent

active

051768720

ABSTRACT:
Improved resin compositions for use in multiple cavity stretch blow molding processes comprising: (a) a propyleneethylene copolymer resin including from about 5% to about 15% of a second stage polymer characterized by a cycle time of T.sub.1, when used to produce containers in multiple cavity stretch blow molding processes; (b) from about 0.1% to about 1.0% of a nucleating agent prepared by irradiating in air a mixture of a propylene homo or copolymer and about 500 to about 3000 ppm of antioxidant with a sufficient amount of ionizing radiation to cause said nucleating agent to have a xylene insoluble content of at least 30%. The improved resin composition is characterized by a cycle time of T.sub.2 when used to produce containers in multiple cavity stretch blow molding processes such that the ratio of T.sub.2 /T.sub.1 is less than 0.95.

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patent: 4569736 (1986-02-01), Kosegaki et al.
patent: 4888369 (1989-12-01), Moore

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