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
1990-03-12
1992-09-29
Michl, Paul R.
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...
524431, 524433, 524435, 524436, 524437, 524444, 524450, C08K 322
Patent
active
051514630
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to resin compositions including ceramics emitting far infrared rays.
BACKGROUND ART
It is known that ceramics consisting of some kinds of metallic oxides or their composite materials can emit far infrared rays having a wave-length not less than 3 microns, in particular, of 4-25 microns at the normal temperature.
Until now, far infrared rays emitted by ceramics have been utilized for heating, drying, or disinfecting foods in a short wave length range at high temperature. Recently, however, utilization of far infrared rays in a long wave length area at or below the room temperature has been noted; as a result, various products utilizing these ceramics have been proposed in order to maintain the freshness and sanitation of foods.
Since these ceramics can be easily formed at or near room temperature, powder ceramics are generally kneaded into polyolefin resins etc. to be formed into a film, a sheet, or other moldings.
However, compositions obtained by kneading powder ceramics into resins such as polyethylene or polypropylene are low in transmission factors of far infrared rays having a wave-length of 3-25 microns, in particular 4-14 microns, and therefore, far infrared rays emitted from ceramics were not able to be satisfactorily utilized.
DISCLOSURE OF THE INVENTION
It is an object of the present invention to provide a composite material of ceramics and resins, which enables far infrared rays emitted from ceramics to be efficiently utilized.
The above object can be attained by resin compositions, according to the present invention, wherein said resin compositions include hygroscopic resins (as base resins) of relatively high water absorption rates, for example high nitrile resins.
It is another object of the present invention to provide resin compositions emitting efficiently far infrared rays.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a graph showing an example of a spectral radiance/wave-length curve obtained by measuring a sheet made from a resin composition according to the present invention.
The resin composition having characteristics shown in FIG. 1 was obtained in the following manner: Ceramics, a principal component of which is aluminum oxide, i.e. powder ceramics SCR3 (produced by SANWA LIFE SERA CO., Ltd. and presented by SANKI BUSSAN CO., Ltd.), were blended or added 20% by weight to one of high nitrile resins, BAREX (a trade mark of a product of MITSUI TOATSU CHEMICALS, INC.), and this mixture was melted at about 210.degree. C. and was mixed and kneaded by means of a twin-screw extruder of 30 mm diameter.
BEST MODE FOR CARRYING OUT THE INVENTION
As ceramics emitting 9 far infrared rays which has a wavelength of 3-25 microns at used temperatures, there are oxides of metal such as aluminum, silicon, titanium, magnesium, zirconium or mixtures thereof. Hygroscopic resins used in the present invention are preferably such that they exhibit a water absorption rate not less than 0.1% when measured by ASTM D-570 (24 Hr/1/2 in).
In the most desired embodiment, although high nitrile resins are highly recommended, other resins can also be used, for example, methylmethacrylate, polyphenyl-sulfone, polycarbonate, polyacetal, nylon-6, nylon-66, polyethylene-terephthalate, or vinyl chloride resins.
The high nitrile resins in the present specification and claims mean a copolymer which contains an unsaturated nitrile compound such as acrylonitrile or methacrylonitrile as a principal component thereof, said copolymer containing said unsaturated nitrile compound in the ratio of 50% by weight or more, preferably more than 55% by weight.
A copolymer of the unsaturated nitrile compound and at least one kind of comonomers such as styrene, butadiene, isoprene, methylacrylate, ethylacrylate, methylmethacrylate, ethylmethacrylate may be used.
As the high nitrile resins, a mixture may be used, for example, a mixture of a copolymer including the unsaturated nitrile compound as a principal part thereof with a rubber-like polymer such as butadiene-acrylonitrile copolymer
REFERENCES:
"Polymer Handbook"; Brandrup et al.; John Wiley and Sons, (1975), pp. VIII-5-VIII-6.
Amemiya Hideo
Hayafune Koji
Naemura Shinichi
Yasumoto Hiroshige
Cain Edward
Michl Paul R.
Mitsui Toatsu Chemicals Inc.
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