Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-06-10
1999-03-16
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525 96, 525 99, 525211, 525216, C08L 5300
Patent
active
058831924
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a novel resin composition containing a cyclic monomer unit-containing polymer. More particularly, the present invention is concerned with a novel resin composition comprising (.alpha.) at least one polymer selected from the group consisting of a non-modified cyclic monomer unit-containing polymer and a modified cyclic monomer unit-containing polymer, wherein the cyclic monomer unit is derived from a cyclic conjugated diene, and (.beta.) at least one polymer other than the polymer (.alpha.), which resin composition is excellent in thermal properties, such as thermal stability with respect to rigidity, and mechanical properties, such as impact resistance.
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 stability) which are not only improved, but also are unlikely to suf
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Imaizumi Kimio
Kato Kiyoo
Natori Itaru
Asahi Kasei Kogyo Kabushiki Kaisha
Michl Paul R.
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