Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-12-11
1989-05-30
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...
C08L 2306, C08L 2308
Patent
active
048352195
ABSTRACT:
Disclosed is polyethylene composition having excellent environmental stress cracking resistance (ESCR) and giving molded articles with good surface properties.
This composition comprises a blend of two specific types of polyethylene selected with due consideration for their molecular weight distribution in addition to their molecular weights, so that it has excellent melt tension, ESCR and moldability. Accordingly, it can suitably be used in blow molding and extrusion molding to produce molded articles with no shark skin, as well as vessels of very large size.
This composition is formed by blending (A) polyethylene obtained according to a two-step polymerization process using a Ziegler catalyst containing magnesium and titanium, and (B) high-molecular-weight polyethylene obtained with the aid of a chromium-containing catalyst, in a specified proportion.
REFERENCES:
patent: 4230831 (1980-10-01), Sakurai et al.
patent: 4336352 (1982-06-01), Sakurai et al.
patent: 4461873 (1984-07-01), Bailey et al.
patent: 4536550 (1985-08-01), Moriguchi et al.
patent: 4617352 (1986-10-01), Page et al.
Kuroda Nobuyuki
Matsuura Kazuo
Nomiyama Kazutosi
Shimo Yoshiyuki
Tajima Yoshio
Nippon Oil Co. Ltd.
Seccuro Carman J.
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