Polyethylene-syndiotactic polypropylene composition and...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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C524S232000, C526S351000

Reexamination Certificate

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07745527

ABSTRACT:
A processable polypropylene composition comprising a mixture of a major amount of a syndiotactic polypropylene and a minor amount of polyethylene wax. The syndiotactic polypropylene has a designated recrystallization temperature, an original minor melting peak and a higher original melting peak. The polyethylene wax provides a recrystallization temperature of the mixture that is greater than the recrystallization temperature of the syndiotactic polypropylene alone and also provides for a minor melting peak and a major melting peak of the mixture, which has a temperature difference which is lower than the difference between the original minor melting peak and the original major melting peak of the syndiotactic polypropylene alone. A process for the production of polypropylene product employing a polyethylene-syndiotactic polypropylene composition as described which is heated to provide a plastic mass of the syndiotactic polypropylene and polyethylene which is processed to provide the product.

REFERENCES:
patent: 6184326 (2001-02-01), Razavi
patent: 6294235 (2001-09-01), Detoumay et al.
patent: 6416699 (2002-07-01), Gownder et al.
patent: 6433103 (2002-08-01), Guenther et al.
patent: 6641993 (2003-11-01), Jacobs et al.
patent: 2006/0020067 (2006-01-01), Brant et al.
patent: 2006/0211819 (2006-09-01), Hoenig et al.
patent: WO 99/10172 (1999-03-01), None

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