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(GDP cabinet P1) Patent application (Rice Showa 9 1st. Patent Office Director Yukio Miyake '1',
title of invention 3, patent applicant 48-[350 6511] HA 0 W 14 letter 1, title of invention,
invention Name polystyrene electret
Polystyrene ル ー ツ ト レ シ -1 (1 other stone).
3. Detailed Description of the Invention The present invention relates to 20 polystyrene electrets.
More particularly, it relates to a practically improved one polystyrene electret. It is well known 5
that various resins become electrets with an external electric field when polarized under high
temperature, high electric field. The surface charge of the electret disappears earlier depending
on the resin used, but it lasts for a relatively long time, and it is boligropyrene. Electrets such as
polystyrene, polyethylene and terephthale), f-polycarbonate, polychlorinated 6-fluorinated
ethylene, 10-poly (47-butyl-l-67) -plupyrene) have been widely studied. Above all, electrets of
poly (tetrafluorinated ethylene-67) are hard to lose their electric charge even under various
environments, so that the electric field of the thin film electret I5 is used as a bias to make a good
electroacoustic transducer, in particular: Microphones have been industrially produced on a large
scale. However, as an electret material, poly (tetrafluoroethylene-16 propylene propylene),
polychlorinated 320EndPage: 1 fluorinated polymers such as fluorinated ethylene are high value,
and the former is easy to creep over time. It also has points. It is difficult to say that polyethylene
terephthalate and polycarbonate electrets have high charge stability, and polypule pyrene
electrets have high charge stability at high temperatures. Polymethyle y is the most common
resin-but its electret can be punched into a certain shape, as represented by poor impact
resistance! Lectore 1) K machining and drilling electrified holes and bolt holes, assembling the
electret in the converter is easy to crack in the operation of defining in the converter, there is a
separate defect in practical use. SUMMARY OF THE INVENTION It is a first object of the present
invention to provide a stable 'electret of am' charge even at high a temperature and high
temperature. The second object is to provide an easy-to-use, easy-to-use, easy-to-use asphalt. The
third purpose is to provide an inexpensive electret. Other objects will be apparent from the
following description. As shown in FIG. 1, Kfk 2 inventors et al. Use polystyrene as the outer layer
1.1 'and another thermoplastic resin as the intermediate layer 2 using a sandwich plate to select
the electret. As a result of conducting research to construct, the resin that will be the middle
layer is 5 alone! In the case of a lefttret, even if it is not possible to obtain a very stable ugly
electret, polystyrene is laminated on both sides, and the original electret becomes extremely
stable, as an interlayer resin.
A resin that contains polystyrene as a blend component or a monomer as a copolymerization
component to have at least 1 degree of compatibility with the outer layer polystyrene, and is a
resin that is more impact resistant than the ps outer layer polystyrene It has been found that the
impact resistance of the molding can be improved by using k. The resin used in the intermediate
layer of the electret of the present invention is selected from those having the following resin
composition (iii) or (ii) and having impact resistance from polystyrene. (T) A copolymer of
styrene and at least one copolymer of monomers copolymerizable with styrene, containing 5 to
9511 parts of styrene as monomer units. (B) Mixture with a thermoplastic resin other than
polyvinylidene fluoride, which contains polystyrene or (and) styrene copolymer as an essential
component, mixed with 10 to 95 weight-percent styrene as a monomer unit in the mixture Of the
turtle. Examples of copolymerization components of styrene copolymers of-) include conjugated
genes such as butadiene, isoprene and chloroprey, unsaturated nitriles such as acrylonitrile, 10
torr methacrylic acid, and methyl acrylate. メチルメタクリレ−ト%! Unsaturated organic acid 1
sters such as chill acrylate, butyl acrylate and octyl acrylate, and other vinyl and vinylidene
monomers. Among these monomers, those having conjugated dienes such as butadiene, etc. as a
copolymer component are particularly preferable because they have excellent impact resistance
and are particularly excellent. Such preferred copolymers include, for example, styrene /
butadiene copolymers, styrene / butadiene / acrylics! Nitrile copolymer, methyl 20 / butadiene /
methyl methacrylate copolymer, 1 methylone / butadiene / acryl free nitrile / methyl
methacrylate copolymer, styrene / butadiene / octyl acrylate / methyl methacrylate copolymer
There are other copolymers similar to this. The five-copolymer may be an alternating copolymer
or a graft copolymer. In the case of the award graft copolymer, those containing styrene only in
the frame-shaped unit are preferable because they contain styrene in the formic acid graft
component but they have high affinity to the outer layer polystyrene sheet. When such a styrenecontaining copolymer is used alone as an intermediate layer resin, it is necessary to contain 5 to
95% by weight as a styrene monomer unit in the copolymer. If the styrene content is low and the
affinity to the outer layer polystyrene is poor, the company polystyrene outer layer 15 is likely to
be peeled or cracked.
The adhesion line between the outer layer polystyrene sheet and the middle layer styrene
copolymer, the type of other copolymerization components, and the polymerization method
differ depending on the styrene content etc., but the more the styrene content, the more the
affinity to the outer layer polystyrene The property is increased by 20 EndPage: 2O, and the
styrene component in the copolymer needs to be at least 5 wt- or more. That is, in the case where
the copolymer is a graft copolymer, when styrene is mainly contained in the graft component, the
content of 5 weight-parts also has the adhesiveness of paper. In the case where the copolymer is
a uniform .quadrature.-polymer or alternating polymer, it is more preferable that the copolymer
contains 10% by weight or more of a styrene component. Since the outer layer polystyrene is
firmly lined with an impact-resistant copolymer, even if the outer layer polystyrene 1-- itself has
low impact resistance, it easily cracks and appears on impact such as machining. In the mixed
resin (b), thermoplastic resins to be mixed with polystyrene or (and) styrene copolymer are, for
example, olefins 11 such as ethylene, propylene etc., vinyl chloride, vinylidene chloride, vinyl
fluoride, 7 Vinylidene fluoride, tribromoethylene. Tetrafluoroethylene, trif tsa '/ l 2ts,
halogenated olefins such as ethylene, acrylic acid, itaconic acid, fumaric acid, maleic acid ti, isounsaturated mono-ta 2' acid and esters of these unsaturated organic acids in al, 1 styrene,
Aromatic substituted vinyls such as methylstyrene and vinylnaphthalene 11. アクリロニトリル。
Polymers of unsaturated nitrile compounds such as metatary tetranitrile and other unsaturated
monomers or copolymers of 25 or more of these (with the exception of vinylidene fluoride
homopolymers). One or more of these polymers or copolymers are intimately mixed with
polystyrene or styrene copolymer as the intermediate layer. It is important that the total amount
of styrene monomers contained as a styrene polymer is 10 to 95 weight-% of the mixed resin
composition. It is also important to determine the composition of the mixture so that the impact
resistance of this mixture composition is better than the polystyrene of the outer layer. Impact
resistance is measured by A8'l'MD 25-6 in any of the above &) and (te intermediate layers), and it
is desirable that the impact strength with a notch is at least 5 kirts / ex, more preferably 5-11 or
more . ′。。 If the thickness of the outer layer polystyrene is large and the stability of the
electret is improved but the thickness of the outer layer 10 is thick-because the outer layer
polystyrene is easily cracked due to poor impact resistance, a thickness between 3μ and 500μ
is suitable The thickness of the intermediate layer may be selected from 10 μ to several
thousand μ, which may be determined in consideration of the performance and thickness of the
electret required, and the like.
Bonding between the outer layer polystyrene and the intermediate layer is usually performed by
melt pressure bonding such as thermocompression bonding or ultrasonic bonding, but
depending on the conditions, either or both of the intermediate layer and the line outer layer are
partially melted immediately after molding It may be crimped by In addition, it is possible to
carry out adhesion at the same time as electret production by the high temperature at the time of
electretization, and to perform bot lefttretization by a known method. Polarization operation is
carried out at a temperature of 40 ° C. to 140 ° C. at 20 kV / am to 1000 for 10 minutes or
more under a high voltage of − / − ma and an electric field is applied, and 11 electric fields are
removed after cooling. 1) The present invention electret is stable in a dry, high temperature (up
to about 90 ° C.) atmosphere, but of course it is extremely effective even in a relatively high
temperature, high temperature atmosphere of, eg, 50 ° C. 90 to 92 ° RH. Hold a stable and
strong electric field. 5) Since the styrene of the outer layer is reinforced by the presence of the
intermediate layer, it is a stable and practical electret for handling such as machining and
assembly. Example 1. 10: Both sides of a 800 μm thick sheet of impact strength 201 g F 薗 15+
with notches according to MB8 Ill (A8 TMI) 256 containing methyl methacrylate: butadiene:
styrene in a weight ratio of 20: 50: 3 G A sandwich sheet as shown in Fig. 1 of diameter 80bonded together by pressure bonding at a temperature of 140 ° C and a thickness of 100 μm
is placed between two electrodes and placed in a thermostat at 120 ° C. A DC electric field of 10
kv (100 kv /: as) was applied between them. After 1 hour, the heating of the thermostatic bath
was stopped and after cooling to room temperature, the DC electric field was removed by 20
EndPage: 3O. As shown in FIG. 2, a porous 710 plate (6) and metal are formed so that an "L" gap
(5) is formed on one side of a 0.4-thick brass ring (4) K on this electret (3) Shield with a clip (7)
and heat it at 50 ° C 90-92-! After measuring for a predetermined time in the atmosphere of RE,
the change of the surface potential was measured using a vibrating capacitive potentiometer. The
result is as shown in FIG. 3 curve ←), and has a very high and stable surface potential. A 2.5-hole
was punched out of this electret with a 6s11 die to make a perforated plate, and two perforated
flanges were tightened around it, but no cracks occurred at all. Example Z Example 1 Muis resin
containing 15:10 near 5 weight ratio of acrylic nitrile: butadiene: styrene instead of MB8 resin
(impact resistant Ill!
Electrets were similarly prepared using 151qcR / cM). The electret of this embodiment is shown
in FIG. The result of conducting the stability test in the same manner is a curve 伽), which is a
very stable electret. -20 example & methyl methacrylate: octyl acrylate: butadiyne :; 600μ sheet
of a copolymer (impact strength 10 kl "m / ts) containing a weight ratio of 30: 35: 20: 15
Example 1 using a sheet laminated with 50 μ polystyrene sheets on both sides. An electret was
created in the same manner as in. The stability test results are shown by the curve ((jK). The
machinability of this electret is also Example 1. The same 10 was. Example 4 High impact
polystyrene (impact strength) obtained by uniformly kneading 15% of ブ タ -butadiene-7-tylene
copolymer (styrene content: 40% by weight) with polyα-methylstyrene 5: 91 and polystyrene:
85% by weight The intermediate layer is 10 kecf 11 / eyt), and the others are Example 1. The
same electret was created. The stability test results of the surface potential of the grain electret
are as shown in FIG. 3). And 20O were as stable. -1 Example 5 A mixture of 40 parts by weight of
polyvinyl chloride, 13 parts by weight of MBi resin (same as used in Example 1), 32 parts by
weight of polymethyl methacrylate, 155 parts by weight of polystyrene (impact resistance '*) The
seed layer of 5 kvtx / espr) is used as an intermediate layer, and a polystyrene sheet of 150 μ
thickness is used as an outer layer, and the other examples are described in Example 1. The same
electret was created. The results of stability test 7 of this electret are as shown in FIG. 3-10. It
was stable as well. Comparative Example 1 ° Example 1 A sheet with a thickness of 1000 μ was
made only with the same MB8 resin used in Example 1. Electrets were manufactured under the
same 15 polarization conditions. The surface potential of this electret is 900 V immediately after
production, and the temperature is further 50 ° C., 90 to 92 嗟 wm. When exposed to the
atmosphere, it becomes almost zero in about 50 hours. 20 Comparative Example 2 The same
high-impact polystyrene single sheet as that used in Example 2 was used to prepare an electret in
the same manner. The initial surface potential of this electret was 120075, and the potential at
the time of exposure to an atmosphere of 90 to 92 × R1 at 50 ° C. was a curve (a). As a control
and as an intermediate layer, a copolymer of butadiene 50 weight fLMM mass 501i was used and
polystyrene was applied to this, but adhesion was poor and a laminate was not produced.
Comparative Example 4 An attempt was made to apply a polystyrene sheet to a copolymer of 4.0
parts by weight of polyvinyl chloride, 15 parts by weight of MB-day resin, 47 parts by weight of
polymethyl methacrylate) as an intermediate layer. I could not stick. In addition, it was possible
to apply a patch 20EndPage: 40 sheets to a sheet of polyvinyl chloride 40 weight 1 G, MB8 resin
13 weight 96% polymethyl methacrylate-) 422 parts by weight, iN +) x tyrene 5 weight%, When
the sheet was perforated S, the periphery of the hole was peeled off and did not withstand
practical use. Comparative Example When polystyrene electrets having a thickness of 5 ° 1000
μ and 500 μ are punched into 7011llφ, the edge is chipped or 'cracked', which is not practical.
The same applies to the opening of the sound hole.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of the electret of the present
invention (t), (1) / indicates outer layer polystyrene, (2) indicates an intermediate layer resin. ! 0
Fig. 2 is a cross sectional view showing the state of the electret stability test, and (3) is an
electret% (4) a spacer. (5) is an air gap, (6) is a porous ferro-plate, and (7) is a metal clip. FIG. 3 is
a view showing the change of the surface potential 15 according to the low price of ructrett and
the qualitative test, wherein a to .. are the present invention and f is a control example. バ、! lrtl
521 No. 2111 J J-5, List of Appendices (1) One Specification (2) One Drawing (8) Application
Duplicate '1 (4) One Letter of Power of Attorney. Inventors other than the above EndPage: 5
Procedure Amendment Showa 8 JJY Japan Patent Office Saito II & Yudon 1 Showcase of the Case
Showa Patent No. 506 10 0 2 2 Title of the Invention 2 Title of the Invention Polystyrene Eretlet
/) 3, Applicants who make corrections Related applicants (110) Toba Chemical, Industrial Co.,
Ltd. 4, Agent Postal Code 103, Tokyo Chuo-ku, Nihonbashi-Horidome-cho, γ-8th Address O5
Procedure Amendment (Formula)% Formula% 1, Indication of case · Patent application No. 50450
2 of Showa, title of invention 2, name of the invention Related applicant with case (110) Toba
Chemical Industry Co., Ltd. 4, Agent zip code 103 Tokyo, Chuo-ku, Nihonbashi-Horidomecho,
Chuo-ku, Tokyo 8-8 Toba Chemical Industry Co., Ltd. Internal set company phone 662-9611
(Major representative) Submit a self-corrected application form as follows. 1 Inventor inventor
Kenji Name 9 List of attached documents (1) Corrected application form 1 (2) Reason document
1 (1) 5 (3) Resident card 1 or more 1050 End Page: 6 Patent Application 1 Positive) May 9 th
Showa 4 j Japan Patent Office Secretary Yukio Miyake 1, title of the invention 1, title of the
invention polystyrene electret 2, inventor representative director Araki three parts 4, agent 〒
103 (6671 ') patent attorney Satoru Shibuya (1) one statement (2) Drawing 1 pc (8) Application
form 1 copy (4) Proxy 1 pc 6, inventor snail other than the above and matinakukura segawama!
Iwaki-shi, Fukushima Prefecture Tsubaki-cho work @ 9B-2-For Sekai Ura Continuity Correction
Book "March 4 Showa 4Q Patent Office Satoshi Front Layer 11 & Yuden 1, Display of the Case
Patent No. 564g Patent No. 564g , No. 2 · Invention 'g'? xfvyxvpJy) 3, Related applicants with the
case for correction Applicants (110) Toba Chemical Industry Co., Ltd. 4, Agent, Toba Chemical
Industry Co., Ltd. "" '-° "°" "-5, correction order On the date specification, tll ■ Page 6, line 14,
"necessary" is corrected as "necessary". ○-The 11th Purchase Line 18 "Eretatlet tube Eto 1 tube
theory example 1" and "There is a correction to Ereettoret 1m theory example 5 · 1".
0, page 12, line 1s "Ptagemene Petit: / Jklk's are corrected as" butary y-methyle y ". Φ page 1s,
line 4, line 4, line S, line 6, line 14 line 14, line 1s line 16 line, correct the "weight part" and the
pipe "weight-" for 10 You End and 50EndPage: 7 Procedure Amendment Showa 4φ 4s 20th
Patent M. Hideto Saito 1, Display of the Case Showa Patent No. 504740 No. 2, Invention Title 2,
Invention Title Holy Methylene Etattle I 3, Those who make corrections Related applicants with
the case 4, Agent · Postal code 103 Tokyo Chuo-ku, Nihonbashi Horidomecho, Chuo-ku, Tokyo 86 Toba Chemical Industry Co., Ltd. Internal telephone 662-9611 (Major representative) (1) 1st
On page 9, line 1 "outer layer polyethylene" is corrected as "outer layer polystyrene". (2) On page
1s, line 10, "Fig. 3 (j)" is corrected as "Fig. 3 (龜)". 5 or more EndPage: 8
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