Polymer of ethylene

Details Polymer of ethylene Polymer of ethylene

2004-11-05

2008-11-18

Lu, Caixia (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

C526S106000, C526S113000, C526S348000

Reexamination Certificate

active

07452954

ABSTRACT:
The invention relates to a polymer of ethylene which has a μo/μ2ratio of at least 13; and a high load melt index HLMI lower than 8 g /10 min, and a value of tan δ at ω/ωc=0.01 of less than 1.3, where δ is G″/G′, ω is the frequency at which G″ and G′ are measured and we is the frequency at which G″=G′, and G and G″ are respectively the elastic modulus and viscous modulus, both measured in Pa at 190° C.; a process for making the polymer using a catalyst comprising chromium supported on a silica-titania support is also described.

REFERENCES:
patent: 6174981 (2001-01-01), Bergmeister et al.
patent: 6331599 (2001-12-01), Koch
patent: 6525148 (2003-02-01), McDaniel et al.
patent: 6867278 (2005-03-01), McDaniel et al.
patent: 0 645 400 (1995-03-01), None
patent: 1 359 192 (2003-11-01), None

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