Molding composition

Details Molding composition Molding composition

1986-04-21

1988-11-22

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...

525268, 525324, 526125, 526123, 526903, C08L 2304, C08L 2306

Patent

active

047866870

ABSTRACT:
A molding composition is disclosed which comprises ultrahigh molecular weight polyethylene having an intrinsic viscosity of 10-30 dl/g at 135.degree. C. in decalin. Improved injection moldability is provided by the use of such polyethylene obtainable by a multi-stage polymerization reaction including at least the following two stages: (a) a first stage in which ethylene is polymerized using a specified composite catalyst in the absence of hydrogen of its presence at lower concentration to produce 50-99.5 weight parts of polyethylene having an intrinsic viscosity of 12-32 dl/g at 135.degree. C. in decalin; and (b) a second stage in which a fresh feed of ethylene is polymerized in the presence of hydrogen at higher concentration to produce 50-0.5 weight parts of polyethylene having an intrinsic viscosity of 0.1-5 dl/g at 135.degree. C. in decalin.

REFERENCES:
patent: 3969470 (1976-07-01), Spiegelman
patent: 4311752 (1982-01-01), Diedrich et al.
patent: 4336352 (1982-06-01), Sakurai et al.
patent: 4461873 (1984-07-01), Bailey et al.

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