Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1995-08-21
1998-05-05
Teskin, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526113, 526114, 526116, 526160, 526164, 526348, 5263482, 5263485, 5263486, 525338, 5253337, C08F21016, C08F 804, C08F 464
Patent
active
057476209
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel ethylene copolymer, a thermoplastic resin composition containing the same, and a novel process for preparing the ethylene copolymer. More specifically, the present invention relates to an ethylene copolymer which can be derived from ethylene and an olefin having 3 to 20 carbon atoms and in which the control of the activation energy of melt flow is possible and physical properties such as density, a melting point and crystallinity can be controlled; a thermoplastic resin composition containing this ethylene copolymer; and a process for efficiently preparing the ethylene copolymer in which non-Newtonian properties are improved and which is excellent in working properties.
BACKGROUND ART
Heretofore, with regard to a polyethylene or an ethylene-.alpha.-olefin copolymer, its primary structure has been controlled by adjusting molecular weight, a molecular weight distribution or copolymerization properties (random properties, a blocking tendency and a branching degree distribution), or by adding a third component such as a diene so as to introduce branches.
On the other hand, for ethylenic polymers, various molding methods are usable, and typical known examples of the molding methods include injection molding, extrusion, blow molding, inflation, compression molding and vacuum forming. In such molding methods, the impartment of high-speed molding properties and the reduction of molding energy have been investigated for a long period of time in order to improve working properties and to thus lower a working cost, and so it is an important theme that optimum physical properties suitable for each use is imparted and the molding can be carried out with the optimum working properties.
In recent years, it has been elucidated that a uniform metallocene catalyst is excellent in the copolymerization properties between olefins, can obtain a polymer having a narrow molecular weight distribution, and has a much higher catalytic activity as compared with a conventional vanadium catalyst. Therefore, it has been expected that the metallocene catalyst will be developed in various technical fields by the utilization of such characteristics. However, a polyolefin obtained by the use of the metallocene catalyst is poor in molding and working properties, and for this reason, the application of the metallocene catalyst to the blow molding and the inflation is unavoidably limited.
A conventional known low-density polyethylene (LDPE) can be obtained by the high-pressure radical polymerization of ethylene and has both of long-chain branches and short-chain branches. It has been considered that the long-chain branches can be formed by the intermolecular hydrogen transfer reaction between the radical growth terminal of the polymer and the polymer. On the other hand, with regard to the mechanism for forming the short-chain branches, some theories have been reported. For example, a 6110 (1953)!. This suggested theory rationally explains that the butyl branch can be formed by the transfer of hydrogen after the formation of a six-membered intermediate at the growth radical terminal. According to another theory, it has been reported that the butyl branch is formed by the production of an associate of two ethylene molecules under a high pressure and a hydrogen transfer reaction at the radical growth terminal, and an ethyl branch can be introduced owing to the production of 1-butene by the hydrogen transfer reaction in the associate of two ethylene another theory, it has been reported that the formation of the ethyl branch is accomplished by the transfer of hydrogen from the main chain of (1959)!.
As understood from the foregoing, it can be summarized that the formation of the long-chain branches and the short-chain branches in the low-density polyethylene is carried out by (1) the hydrogen transfer reaction based on a radical polymerization and (2) the change of radical polymerization reactivity by the association of ethylene molecules under a high pressure, and this is a usually recog
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Hoshino Ayami
Machida Shuji
Shikuma Haruo
Takakura Yutaka
Idemitsu Kosan Co. Ltd.
Teskin Fred
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