High melt-viscoelastic polypropylene for post-processed sheets a

Details High melt-viscoelastic polypropylene for post-processed sheets a High melt-viscoelastic polypropylene for post-processed sheets a

1983-05-18

1985-02-19

Seccuro, Carman J.

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

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525247, 526348, 526351, 526 73, C08L 2312, C08L 2316

Patent

active

045006822

ABSTRACT:
A polypropylene (PP) having a superior post-processability and blow moldability is provided, which PP is obtained by polymerizing propylene at multiple stages using a catalyst comprising a TiCl.sub.3 composition, an organoaluminum compound and a molecular weight (M.W.) modifier, the resulting final polymer comprising a higher M.W. portion and a lower M.W. portion having a melt flow index of 0.03 to 2.0 g/10 min., and between this index and a melt flow index (10.2 kg/10 minutes, 230.degree. C.) as measured under 5 times the load applied in the measurement of the former melt flow index, there being a relationship log HMI.gtoreq.0.922 log MI+1.44, and the final polymer consisting of 40 to 60 weight % of a PP portion corresponding to the higher M.W. portion and 60 to 40 weight % of a PP portion corresponding to the lower M.W. portion.

REFERENCES:
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patent: 4301256 (1981-11-01), Jezl
patent: 4339557 (1982-07-01), Hasuo et al.
patent: 4365045 (1982-12-01), Schneider et al.
patent: 4380608 (1983-04-01), Hasuo et al.
patent: 4414369 (1983-11-01), Kuroda

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