Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1984-04-12
1985-08-20
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...
526352, C08L 2306
Patent
active
045365504
ABSTRACT:
A polyethylene composition comprising three specific types of polyethylenes; polyethylene (A), polyethylene (B) and polyethylene (C) respectively. The polyethylene composition has a melt index not less than 0.001 g/10 min. and not more than 10 g/cm and exhibits excellent processability under variant molding techniques. Molded objects exhibit excellent physical properties such as impact strength environmental stress cracking resistance and uniform thickness distribution. Polyethylene (A) has a molecular weight of from 5,000 to 90,000 and polyethylene (C) has a molecular weight of from 100,000 to 1,500,000 and the ratio of the molecular weight of polyethylene (C)/the molecular weight of polyethylene (A) is from 4 to 200. Polyethylene (B) has a molecular weight of from 50,000 to 500,000, being prepared by a polymerization with use of a chromium compound-supported type catalyst capable of producing a specifically conditioned homopolyethylene with respect to the properties of the polymers in terms of flow ratio and die swell.
REFERENCES:
patent: 3127370 (1964-03-01), Head
patent: 4230831 (1980-10-01), Sakurai et al.
patent: 4336352 (1982-06-01), Sakurai et al.
Japanese Laid-Open Patent Publication 841/1981.
Translation--Journal of Society of Rheology of Japan, vol. 8, _pp. 154-160, (1980), (Characterization of Low-Density Polyethylenes _and Relationships Among Melt Index, Density, and Molecular Structural _Parameters by Minoru Rokudai et al.).
Ikegami Tadashi
Moriguchi Kisoo
Asahi Kasei Kogyo Kabushiki Kaisha
Seccuro Carman J.
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