Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Patent
1990-08-08
1997-09-30
Mulcahy, Peter D.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
524569, C08L 6700
Patent
active
056726503
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a vinyl chloride resin composition which provides a rubbery elastic material having a hardness only slightly dependent on temperature, and it also relates to a tube having good heat distortion resistance and high impact resilience and a matte curl cord having high impact resilience which are made by molding the above vinyl chloride resin composition.
BACKGROUND ART
In general, vinyl chloride resins have hardness values which depend greatly on temperature, i.e. their hardness varies greatly depending on the temperature. Therefore, grips and the like which are used outdoor are apt to change in touch depending on the outside temperature, and this is a severe limitation. For example, in the case of general vulcanized rubbers, the temperature-dependent difference of hardness (JIS K 6301A type) is about 10 in the range of -20.degree. C. to 80.degree. C. and thus the temperature dependence of hardness is small. In the case of general non-rigid vinyl chloride resins, the hardness temperature dependence shows a high value of about 40 making these resins generally inferior in temperature dependence of hardness. In order to reduce temperature dependence of hardness, use of a vinyl chloride resin containing a gel fraction has been considered, but temperature-dependent difference of hardness (JIS K 6301A type) 1 has been improved only by about 5 in the range of -20.degree. C. to 80.degree. C. as compared with general non-rigid vinyl chloride resins.
Rubbers are mainly employed for uses which require heat distortion resistance and high impact resilience. This is because they possess heat distortion resistance and high impact resilience which are characteristics of rubbers. However, tubes formed of rubber, require vulcanization and thus suffer from the problems that the number of operation steps increase and in addition the material cannot be recycled. In order to solve these defects of rubbers, non-rigid vinyl chloride resins or thermoplastic elastomer resins are used in some tubes, but since they are thermoplastic resins, they are low in heat distortion resistance and inferior in creep property and are limited in scope of use. A curl cord coated with a non-rigid vinyl chloride resin composition high in impact resilience which comprises a vinyl chloride resin containing a gel fraction to which a plasticizer is added, is widely used in place of urethane resin and polyester resin. However, although curl cords coated with conventional vinyl chloride resin compositions are inexpensive as compared with urethane and polyester resins and besides show no discoloration and have self-extinguishing properties, they are inferior to urethane or polyester resin-coated curl cords in impact resilience (JIS K6301, which is used also for the measurement referred to hereinafter), heat distortion degree (JIS K6723, which is used also for the measurement referred to hereinafter) and permanent compression set (JIS K6301, 70.degree. C..times.22 hr, which is used also for the measurement referred to hereinafter). Furthermore, in case of a use such as a curl cord for an automobile telephone set the body of which is small, urethane and polyester resins are too high in impact resilience, resulting in movement of the body of the telephone set, and vinyl chloride resins are too low in impact resilience and are inferior in spring back, and there have been no vinyl chloride resins having proper impact resilience. Further, for some uses, the peculiar gloss of vinyl chloride resins is unsatisfactory.
Sufficiently satisfactory solutions have not been obtained for curl cords in which the conventional vinyl chloride resin composition is used.
That is, improvement of impact resilience by conventional methods has been contemplated by using vinyl chloride resins containing a gel fraction. However, these methods have not attained sufficient improvement. Furthermore, in order to take off gloss of vinyl chloride resins, extrusion temperature must be lowered and thus productivity decreases and, generally, prop
REFERENCES:
patent: 3718715 (1973-02-01), Crawford et al.
patent: 4340550 (1982-07-01), Higashiguchi et al.
Rogozinsky, Kramer, "Determination of the Gel Content of Vinyl Chloride Polymers and Copolymers", Journal of Polymer Science: Polymer Chemistry Edition, vol. 10, pp. 3111-3112, 1972.
Mulcahy Peter D.
Sumitomo Bakelite Company Limited
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