Polypropylene having a high melt-tensile strength, a process for

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

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5253338, 525385, 525386, C08F 800

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active

054161690

ABSTRACT:
A linear, crystalline polypropylene having a branching coefficient of substantially 1, and a specified relation between melt-tensile strength and intrinsic viscosity, a specified relation between crystallization temperature and melting point, a boiling xylene-extraction residue % of 1 wt. % or less and if necessary, a specified ratio of weight average M.W.
umber average M.W.; a molded product from the above polypropylene; and a process for producing a polypropylene having the above polypropylene blended with di-2-ethylhexyl peroxydicarbonate, are provided, the above polypropylenes having a very high melt-tensile strength and crystallization temperature and also superior stiffness and moldability, to thereby broaden the restricted application fields of conventional polypropylene.

REFERENCES:
patent: 4387044 (1983-06-01), Sanchez et al.
patent: 4818785 (1989-04-01), Otawa et al.
patent: 4842765 (1989-06-01), Satomi
patent: 4900781 (1990-02-01), Hirai et al.
patent: 5047485 (1991-09-01), De Nicola, Jr.

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