Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1996-06-05
1998-11-03
Zitomer, Fred
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526180, 526308, 526337, 526340, 526347, 5263471, 525356, C08F 3202, C08F 3204
Patent
active
058309659
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a novel polymer containing a modified cyclic monomer unit and a method for producing the same. More particularly, the present invention is concerned with a novel polymer containing a modified cyclic monomer unit derived from a cyclic conjugated diene, which polymer not only has stable mechanical properties which are unlikely to suffer an unfavorable change at ambient temperatures, but also possesses advantages such that, for example, when the polymer is combined with other polymers to provide composite resin materials, the resultant composite resin materials are imparted with stable and excellent mechanical properties. The present invention is also concerned with a method for producing such a novel excellent polymer.
2. Prior Art
In recent years, polymer chemistry has continuously made progress through various innovations in order to meet commercial demands which have been increasingly diversified. Especially in the field of polymer materials to be used as commercially important materials, extensive and intensive studies have been made toward developing polymers having more excellent thermal and mechanical properties. Various proposals have been made with respect to such polymers and methods for the production thereof.
Polymer materials are advantageous in that they have light weight and have a large freedom of selection with respect to the shapes of ultimate molded products, and that a wide variety of unique properties can be exhibited in accordance with the types of polymer materials used. Therefore, polymer materials are used in an extremely wide variety of application fields, such as those for automobile parts, electric and electronic parts, railroad parts, aircraft parts, fibers, clothes, medical equipment parts, packaging materials for drugs and foods and materials for general miscellaneous goods. Further, in accordance with the diversification of commercial demands and the progress of technology, the importance of polymer materials has been increasing by great leaps.
In recent years, due to a rise in the consciousness about environmental problems, with respect to materials to be used in, for example, the fields of automobile parts, electric and electronic parts and the like, a demand for decreasing the number of the types of necessary materials so as to decrease the weight and number of parts, has been rapidly increasing. For the purpose of meeting this demand, energetic researches have been widely conducted on how to replace structural non-polymer materials with polymer materials and how to decrease the number of the types of structural materials.
However, as one of the most important problems which must be solved for developing polymer materials, especially organic polymer materials, which can be widely used as structural materials, there is a problem inherent in conventional polymer materials, namely a problem that polymer materials exhibit a considerably large change in mechanical properties in accordance with changes in ambient temperature.
The reason for the occurrence of the above-mentioned phenomenon with conventional polymer materials is generally presumed to be as follows. When the ambient temperature of a polymer material is elevated to a temperature which is higher than the glass transition temperature (Tg) of the polymer material, the molecular chain of the polymer is changed from a glassy state to a rubbery state, and this change of state becomes a main cause for a considerably larger change in mechanical properties. Therefore, it has, in principle, been impossible to solve this problem insofar as a polymer material having a single molecular structure is used, so that extensive and intensive studies have been made for solving the problem by using a combination of a plurality of different types of polymer materials.
For example, in order to obtain a polymer material having mechanical properties (such as thermal stability with respect to rigidity and mechanical strength, impact resistance and dimensional sta
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Imaizumi Kimio
Kato Kiyoo
Natori Itaru
Yamagishi Hideyuki
Asahi Kasei Kogyo Kabushiki Kaisha
Zitomer Fred
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