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Description 1, title of the invention
Polymer electret
3. Detailed Description of the Invention The present invention relates to an electret having a
polymer material as a dielectric. As is well known, electrets permanently retain electrical
polarization by special polarization treatment, and have been known since ancient times. The
electret phenomenon is more or less found in insulating materials, but at present, electrets which
are excellent for practical use have been made of artificially collected polymer materials. The
polymer materials used for electrets are (1) a polymer of tetrafluoroethylene-6 (7 v) -propylene
copolymer, poly (ethylene terephthalate) V-, poly (vinylidene bromide), poly (methyl
methacrylate), polypropylene and the like. However, despite the possibility that it will be used in
many fields in the future, the electret is currently limited to a special type of degraphing device
with a sufficiently high surface charge density at present electrets ( Or Table Ii + @ position) is
not obtained, and its stability is also insufficient. The inventors of the present invention have
found that, from the results of various studies, electrets of uniaxially stretched or two-ring
stretched films of poly [3, s-bis (chloromethyl) -aged croptane] show a high surface potential as
compared with unstretched films, It has been found that the stability is also excellent. . ポリ
!:3.3−ビス(クロロメチル)オg? It is poly [S, a-bis (Rn) that shows superior electret
property compared to sanclobutane] or other polymers. It is inferred that a unique tgmat
according to (methidi) a) 1), and various researches are carried out. It has become clear that
heterocrystallization occurs. However, it has now been found that even if the film after the
different crystallization has been previously made, it exhibits excellent Elect EndPage: 13
bearability as well. The unique crystals can be easily generated by stretching. The different
crystals of bovcs and s-bis (lye methyl) oxacyclobutane] are usually called β-type crystals, and
the crystals themselves have spontaneous polarization in order to have a crystal structure
without a symmetrical center. The β WIMI crystals are obtained by stretching at 130 ° C. or
less. The stretching may be uniaxial or biaxial. In addition, the stretching speed may be any speed
at a temperature of 1 ao-0 or less. Furthermore, to increase the amount of β-type crystals, the
sheet is extruded from an extruder with a temperature of 1 ao ”c to 240 c, and passed through
cold water of C 10 ′ ′ C or less, mainly an amorphous sheet. And obtained by stretching this
sheet at 1 so "0" or less.
In addition, the crystal is already in the α form (1 (the sheet also has a βg + dislocation by
stretching at a high magnification of 10σG or less). In this manner, a stretched film of poly [3,3bis (chloromethyl) oxacyclobutane] mainly composed of 2 厘 is thermally electret--that is, the
film is sandwiched between flat plate electrodes, and a direct current voltage (polarization
voltage) is The temperature is raised to a certain temperature (polarization temperature), held at
that humidity for a fixed time (polarization time), and then lowered to remove the voltage to form
an electret. The polarization voltage is 1 μm 95 to 100 V, and the polarization temperature is 10
° C. to 180 ° C., and the polarization time is 30 minutes or more. The stable surface potential
of the electret thus obtained shows 850 to 800 V, which is higher than the unstretched 7-yl A
(D350-5ooV). This cause is β! As compared to the formation of ltM crystals, the field strength of
the stretched film forms a large amount of βm crystals in advance, and the electric field acts
only to orient the crystals, so that it is l-1 ′ ′. , Due to the large amount of oriented β
anticrystals. As described above, poly (: a, S-bis (chloromethyl) o =? E) using a drawn film of -F
cyclogtane] has high surface potential and good stability, and thus has high industrial value. Then
夾 m of the present invention? I will tell about 1 about 1 Implementation fl 11 poly [S, S-bis
(chloromethyl) oxashiro □ chlorobutane] was formed into a sheet by an extruder. The die
temperature of the extruder barrel was 182-232 ° C. This sheet was 90 "C" "C-stretched by a
tenter simultaneous biaxial stretching machine. The draw ratio was 4 in the longitudinal direction
and 4 in the transverse direction. The film was then stabilized by heat treatment at 96 ° C. The
film was electretized by a conventional thermal processing V-cret method. The polarization
conditions are a film of 40 Pm, a polarization voltage of 200 V, a polarization temperature of 116
° C., and a polarization time of 2 hours. The surface potential of this film was eoo V immediately
after electontization, left at 70% relative temperature for 1 hour, 863 V, left for 1 day, and 796 v
for 8137.1 months. The surface potential was measured by an electric pigeon measuring
instrument. In addition, in the unstretched 40 micrometer film, it was 360-490v. Implementation
A sheet of 4s2 poly I: s, s-bis (chloromethyl) oxacyclobutane was uniaxially rolled and stretched
at 60 ° C. by a roll mill to form a film of 1 oo Pm thickness.
This film was electretized in the same manner as in Example 1 to obtain a surface potential of
830 v. The draw ratio was about 6 times. Example 3 Poly [3,3-bis (chloromethyl) oxacyclobutane
1 is extruded into a sheet by an extruder and immediately quenched by passing it through water
at 0 ° C., and this sheet is batch-processed small size simultaneous biaxial stretching I ! ! C. for 6
times at C. and heat-treated at C. under tension. This film was electretized
under the same polarization conditions as in Example 1 to obtain an 11 surface potential eaov. As
apparent from the above examples, the polymer electret of the present invention has a high
surface potential and is stable as compared with the conventional electret t, and its utility value is
high. Name of Agent Attorney Nakao and 1 other EndPage: 2
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