Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1997-05-06
1998-05-26
Mosley, Terressa
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C08F 800
Patent
active
057565805
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel polymeric composite material which comprises two or more polymers having a cyclic monomer unit. More particularly, the present invention relates to a novel polymeric composite material which comprises a resin composition containing at least two polymers selected from the group consisting of a polymer having a cyclic conjugated diene monomer unit and/or a cyclic olefin monomer unit and a modified polymer thereof, or which comprises a resin composition containing other polymers which are further added to the resin composition according to desire.
BACKGROUND ART
In research on a polymeric material which can be used as an industrial material, many studies have been conducted to find materials which exhibit excellent heat resistance and mechanical strength. As a result, various types of material have been proposed.
These polymeric materials are used in a wide variety of fields such as an automobile part, an electrical part, an aircraft and space part, sports and leisure goods and general variety goods because they have outstanding features of being light, of being shaped highly freely and of exhibiting various properties according to the types of use. Their importance has drastically increased because of market demand and the progress of scientific techniques.
However, one of the most important problems to be solved when such polymeric materials are used as an industrial material in a wide range of applications is the fact that the mechanical properties of an organic polymeric material change considerably depending on the temperature of the atmosphere during use.
It is believed that the major cause of this problem is that the polymer chains are converted to a rubber state from a glass state when the atmosphere temperature in use reaches the region above the glass transition temperature (Tg) of the polymer.
Therefore, it is essentially impossible to solve this problem by using a polymeric material having a single molecular structure so that heretofore many studies have been conducted to solve this problem by combining plural polymeric materials.
For example, as one of the specific methods to solve this problem, an attempt to obtain polymeric materials having low sensitivity to atmosphere temperature has often been made by compounding or copolymerizing one polymeric material with other polymers having a different Tg in order to improve the mechanical properties of the polymeric material (e.g., rigidity at a high temperature, impact resistance, strength at a high temperature and dimensional stability).
However, in prior art wherein the above attempt has been made, it is necessary to diversify the types of polymers to be compounded according to the improvement purposes. This does not always satisfy a market demand for making the number of types of polymeric materials used as an industrial material as small as possible.
Therefore, aggressive studies on (hydrogenated) conjugated diene type polymers such as polybutadiene and polyisoprene, which are representative components contained in composite materials, have been made. Since the conjugated diene type polymers can be subjected to living anionic polymerization, they have high degrees-of-freedom of polymer chain design and their material properties are controlled relatively easily. When they are used as an improvement material for the composite material, they have the possibility to impart rigidity at a high temperature, impact strength, strength at a high temperature, dimensional stability and the like by compounding or copolymerizing the same type materials.
There is currently a strong demand for development of a conjugated diene type polymeric material having higher thermal properties (melting point, glass transition temperature, heat distortion temperature and the like) and mechanical properties (tensile modulus, flexural modulus and the like).
As one of the most effective methods to solve this problem, investigations on a method for obtaining an excellent composite material improved in necessary proper
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Imaizumi Kimio
Kaji Satoru
Natori Itaru
Asahi Kasei Kogyo Kabushiki Kaisha
Mosley Terressa
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