Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-04-02
2000-12-05
Wilson, Donald R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525320, 525324, C08L 2300, C08L 2316, C08F25502, C08F25508
Patent
active
061568457
DESCRIPTION:
BRIEF SUMMARY
POLYOLEFIN COMPOSITION AND METHOD OF MAKING
TECHNICAL FIELD
The present invention relates to an olefin (co-)polymer composition and a method for producing the same, and to a catalyst for olefin (co-)polymer polymerization and a method for producing the same. More particularly, the present invention relates to a preliminarily activated catalyst for olefin (co-) polymerization which is obtained by causing a catalyst for producing polyolefin having, as a main component, a transitional metal compound catalyst component containing at least a titanium compound to support polyolefin to be polymerized and polyolefin having a high degree of polymerization and a method for producing the preliminarily activated catalyst for olefin (co-) polymerization, and to a catalyst for olefin (co-)polymerization having the preliminarily activated catalyst as a main component, and a polyolefin composition having high melt tension and high crystallization temperature which uses the catalyst for olefin (co-)polymerization, and a method for producing the same.
BACKGROUND OF THE INVENTION
Since a polyolefin such as polypropyrene, high-density polyethylene, straight chain low-density polyethylene or the like is excellent in mechanical properties, chemical resistance and the like and is very useful in respect of a balance of economy, it has been widely utilized in every molding field. However, the polyolefin has small melt tension and a low crystallization temperature. For this reason, molding properties such as hollow molding, foam molding, extrusion molding and the like are poor and the high-speed productivity of a mold has limitations in various molding methods.
A method for causing polypropylene to react with organic peroxide and a crosslinking auxiliary agent in the melting state (Japanese Unexamined Patent Publication Nos. 59-93711, 61-152754 and the like), a method in which a low decomposition temperature peroxide is caused to react with semicrystalline polypropylene in the absence of oxygen to produce polypropylene which has free end long chain branch and does not contain gel (Japanese Unexamined Patent Publication No. 2-298536) and the like have been disclosed as a method for increasing the melt tension and crystallization temperature of polypropylene.
A composition in which polyethylene having different intrinsic viscosity or molecular weight or polypropylene are blended and a method for producing the same composition by multistep polymerization have been proposed as another method for enhancing melt viscoelasticity such as melt tension or the like.
There have been disclosed a method for adding 2 to 30 weight parts of superhigh molecular weight polypropylene to 100 weight parts of ordinary polypropylene and extruding a product at a temperature which is equal to or higher than a melting point and equal to or lower than 210.degree. C. (Japanese Examined Patent Publication No. 61-28694), a method of preparing an extrusion sheet made of polypropylene which is obtained by a multistep polymerizing method and contains 2 components having the limiting viscosity ratio of 2 or more and different molecular weights (Japanese Examined Patent Publication No. 1-12770), a method for producing a polyethylene composition which contains 1 to 10 weight % of polyethylene having high viscosity-average molecular weight and comprises three kinds of polyethylene having different viscosity-average molecular weights by a melting and kneading method or a multistep polymerizing method (Japanese Examined Patent Publication No. 62-61057), a method for polymerizing superhigh molecular weight polyethylene having a limiting viscosity of 20 dl/g or more with 0.05 to less than 1 weight % according to a multistep polymerizing method using an active titanium-vanadium solid catalyst component (Japanese Examined Patent Publication No. 5-79683), a method for polymerizing 0.1 to 5 weight % of superhigh molecular weight polyethylene having a limiting viscosity of 15 dl/g or more by using an active titanium catalyst component which has preliminarily been polymer
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Kikukawa Shingo
Nobuhara Hideo
Saito Jun
Sato Hitoshi
Yamauchi Akira
Chisso Corporation
Wilson Donald R.
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