JPS60210008A - Reflector plate for circular polarized antenna - Google Patents

Abstract

PURPOSE:To attain both high reflection properties and high weather resistance for a reflector plate for circular polarized antenna, by laminating successively a thermoplastic resin layer having the weather resistance, a shape material consisting of a metallic mat, etc. and a phenylene oxide polymer layer containing an inorganic filler with specific thickness, shape and content respectively. CONSTITUTION:This reflector plate consists of a thermoplastic resin layer 3, a layer I containing a metallic shape material and a phenylene oxide polymer layer IIcontaining an inorganic filler. The layer 3 having high weather resistance has its thickness between 5mum and 5mm., and a shape material 2 consisting of the metallic mat, cloth and net is set at <=2 meshes. The thickness of the phenylene oxide polymer layer 1 containing an inorganic filler is set in a range between 500mum and 15mm. with 10-80wt% content of the inorganic filler. Then the content is set at 5.0wt% in all for a condensation product containing phenylene oxide and that which is grafted by a vinyl compound containing styrene contained in the layer 1. Thus it is possible to attain high reflection properties and high weather resistance.

Description

Detailed Description of the Invention [I] Purpose of the Invention The present invention provides a radio wave reflecting layer consisting of a laminate having at least one shape selected from the group consisting of metallic mats, cloths and nets as an intermediate layer. The present invention relates to a reflector for a circularly polarized antenna. More specifically, at least (A')
Thermoplastic resin layer with good weather resistance (B) metallic mat,
(C) A laminate formed by sequentially laminating inorganic filler-containing phenylene oxide polymer layers, the thermoplastic resin layer having a thickness of 5 microns. The thickness of the metallic mat, cloth, and net is finer than 2 meshes, and the thickness of the inorganic filler-containing phenylene oxide polymer layer is 500 microns to 15 mm. This invention relates to a reflector for a circularly polarized antenna, characterized in that the content is 10 to 80% by weight, and the object is to provide a reflector for a circularly polarized antenna with good weather resistance. .

[+1] Background of the Invention Satellite broadcasting using the 1F satellite is being planned for practical use in Europe, America, Japan, and other countries around the world in the near future. However, since a geostationary satellite has only one orbit, there is a risk of interference between multiple broadcast radio waves. In order to avoid such mutual interference of broadcast waves, it is necessary to utilize cross-polarization identification of satellite broadcast receiving antennas. In this way, when receiving terrestrial broadcast waves, the radio waves are linearly polarized horizontally or vertically, and the polarization plane of the receiving antenna is matched to the polarization plane of the broadcast waves, using cross-polarization discrimination. However, when receiving radio waves from a broadcasting satellite, the polarization plane shifts due to disturbances caused by the ionosphere in the radio wave propagation path and the angle of incidence of the radio waves at the receiving point, so the above-mentioned method is not possible. It is difficult to match such planes of polarization.

Frequency allocation to multiple broadcasting satellites is considered to be done taking into consideration polarization plane discrimination from the point of view of effective use of satellite broadcasting frequency bands, but for satellite broadcasting radio waves with such frequency allocation, Since the quality of the polarization plane adjustment of the receiving antenna directly determines the level of interference between broadcast channels, it cannot be expected to obtain a high degree of cross-polarization discrimination when broadcast satellite radio waves are linearly polarized waves. However, when broadcasting satellite radio waves are circularly polarized waves, it is easy for ordinary listeners to identify them by the direction of the circularly polarized wave, regardless of the deviation of the polarization plane as described above. The receiving antenna not only adjusts its directivity plane to direct it to the desired broadcasting satellite, but also does not require adjustment of the polarization plane, so it is much easier to adjust the receiving antenna than when linearly polarized waves are used. This is simple, and it is possible to obtain polarization discrimination as designed for the receiving antenna.

For these reasons, plans are being made to use circularly polarized waves for broadcast satellite radio waves in future satellite broadcasting systems. On the other hand, there are conventional circularly polarized antennas that use a biconical horn, two dipoles combined at right angles, and parabolic antennas that use these antennas as the primary radiator. However, the structure is complex, large, and expensive to manufacture, making it suitable for general audience receiving antennas for receiving satellite broadcast radio waves using microwaves in the 12 gigahertz (GH) band. Not yet.

On the other hand, the structure is extremely simple, and as a small and lightweight microwave antenna, a rectangular waveguide is extended in the axial direction from the center of a parabolic reflector, and its tip is curved so that the opening end surface becomes a parabolic shape. Place it opposite the parabolic reflector at the focal point.

There is a so-called Hi-Ha) type parabolic antenna that uses this as a -order radiator. This antenna is widely used in microwave antennas for mobile relays, etc., but all conventional Heehat-type parabolic antennas use the aforementioned rectangular waveguide to transmit and receive linearly polarized waves. Therefore, it cannot be used for circularly polarized waves.

Generally, metal plates or metal nets have been used as parabolic antennas. However, since metals corrode, it is necessary to use anti-corrosion alloys or apply anti-corrosion coatings. If anti-corrosion alloys are used, they are expensive. On the other hand, with anti-corrosion coatings, it is necessary to repeat the coating several times to achieve complete corrosion protection, which is not only expensive but also
There is a problem in that the painted material deteriorates after being used for many years. Furthermore, attempts have been made to manufacture radio wave reflecting plates in which glass fibers with metallized surfaces are laminated to thermosetting resins such as unsaturated polyester resins as radio wave reflecting layers, but the manufacturing method is complicated and It has been extremely difficult to maintain the radio wave reflective layer at a constant thickness and without unevenness.

[l111 From the structure of the invention, the present inventors have obtained a reflector for a circularly polarized antenna that has a simple manufacturing process, has radio wave reflecting ability, and can maintain its performance for a long period of time. As a result of various searches, we found that at least (A) a thermoplastic resin layer with good weather resistance (B) [at least one type of shape selected from the group consisting of metallic mats, cloths, and nets]
(Hereinafter referred to as "metallic shaped object") (C) A laminate formed by sequentially laminating inorganic filler-containing phenylene oxide polymer layers, and the thickness of the thermoplastic resin layer is 5 microns to 5 mm. , the metallic shape is finer than 2 meshes, and the thickness of the inorganic filler-containing phenylene oxide polymer layer is 500 microns to 15 mm, and the inorganic filler content of this layer is 10 mm.
~80% by weight, and the phenylene oxide polymer is a polymer obtained by grafting a vinyl compound containing at least styrene to a phenylene oxide-containing condensate, a rubbery material, and/or a phenylene oxide-containing condensate, and a polymer containing at least styrene. At least one thermoplastic resin selected from the group consisting of polymers containing a phenylene oxide-containing condensate and a phenylene oxide-containing condensate grafted with a vinyl compound containing at least styrene in the phenylene oxide-based polymer. A reflector for a circularly polarized antenna, characterized in that the total content of these substances is at least 5.0% by weight, not only has good durability but also has excellent radio wave reflection characteristics. They discovered this and arrived at the present invention.

[TV] Effects of the Invention The circularly polarized antenna reflector of the present invention exhibits the following effects (features) including its manufacturing process.

(1) Since it has excellent corrosion resistance, there is no change in radio wave reflection characteristics over a long period of time.

(2) Since the coefficient of linear expansion of the inorganic filler-containing layer is extremely small, delamination between the layers will not occur even if the layer is subjected to heat cycles (repetitive cold and heat cycles) for a long period of time.

(3) The reflector for a circularly polarized antenna is lightweight and the manufacturing process is simple.

(4) It is possible to form a metallic object uniformly, and there is no uneven reflection of radio waves.

(5) Phenylene oxide polymers containing inorganic fillers can be easily formed into various complicated shapes, and therefore have good appearance and functionality.

(6) The mechanical strength (especially rigidity) of the circularly polarized antenna reflector is excellent.

[V] Detailed description of the invention (A) Thermoplastic resin The thermoplastic resin used to manufacture the thermoplastic resin layer of the present invention is widely produced industrially and used in many fields, Their manufacturing methods and various physical properties are well known. Their molecular weight varies depending on the type, but generally ranges from 10,000 to 1,000,000. Typical thermoplastic resins are homopolymers of monomers having double bonds, such as ethylene, propylene, vinylidene fluoride, vinyl chloride, and styrene, and these are the main components (more than 50 FJ!-%).
Copolymers of styrene and acrylonitrile (AS resin), resins whose main component is methyl phthalate (MMA resin), butadiene copolymer rubber, acrylonitrile-butadiene copolymer rubber (NBR), styrene-
Butadiene copolymerization: lmu (SBR), acrylic rubber,
Ethylene-propylene copolymer rubber (EPR), ethylene-propylene-diene ternary copolymer rubber (EPDM)
and graft copolymer resins, polyamide resins, polyester resins, polyphenyls obtained by graft copolymerizing styrene alone or styrene and other vinyl compounds (e.g., acrylonitrile, methyl meccrylate) to rubber such as chlorinated polyethylene. Examples include oxide resins and polycarbonate resins.

Furthermore, these thermoplastic resins contain organic compounds having at least one double bond (for example, unsaturated carboxylic acids,
Even resins modified by grafting or the like with the anhydride can be preferably used as long as they have excellent processability. Furthermore, in addition to the above-mentioned graft copolymer resin, compositions obtained by blending the above-mentioned rubber with these thermoplastic resins (the blending ratio of rubber is generally at most 40% by weight) can also be used. can. Among these thermoplastic resins, fluorine-containing resins such as polyvinylidene fluoride are preferred because of their excellent weather resistance. Furthermore, even with vinyl chloride-based resins, ethylene and/or propylene-based resins, the weather resistance of these formulations can be improved by adding UV absorbers. You can use it as you like. Furthermore, polyamide resins, polyester resins and polycarbonate resins can also be used. Among these thermoplastic resins, olefin resins (ethylene homopolymers, propylene homopolymers, copolymers mainly composed of ethylene and/or propylene)
When part or all of a modified resin obtained by graft polymerizing an organic compound having at least one double bond (in particular, an unsaturated carboxylic acid and its anhydride is desirable) is used, the metallic shape described below and This is advantageous because of its excellent adhesive properties.

([3) Metals Furthermore, typical examples of metals that are raw materials for metallic shapes in the present invention include simple metals such as aluminum, iron, nickel, copper, and zinc, and alloys containing these metals as main components (e.g. , stainless steel, brass). These metals do not need to be surface-treated, and may be previously subjected to surface treatment such as chemical treatment or plating treatment. Furthermore, those that have been painted or printed can also be preferably used.

(C) Phenylene oxide polymer The phenylene oxide polymer used to produce the inorganic filler-containing phenylene oxide polymer layer in the present invention is a phenylene oxide-containing condensate,
At least one thermoplastic resin selected from the group consisting of a polymer obtained by grafting a vinyl compound containing at least styrene to a rubber-like material and/or a phenylene oxide-containing condensate, and a polymer containing at least styrene. . However, the total content of the phenylene oxide-containing condensate and the phenylene oxide-containing condensate grafted with a vinyl compound containing at least styrene in this phenylene oxide polymer is at least 5.0% by weight. It is preferably 7.0% by weight or more, particularly preferably 10% by weight or more.

(1) Phenylene oxide-containing condensate The phenylene oxide-containing condensate used in the present invention is expressed by the following formula [
(■) formula] polyphenylene ether (hereinafter r
PPOJ).

In formula (1), Ql and Q2 may be the same or different, and are an alkyl group having 1 to 4 carbon atoms, and n is a positive integer of at least 5o, and is generally 100 or more.

Representative examples of the PPO include poly(2,6-dimethylphenylene-1,4-ether), poly(2,6-ethylphenylene-1,4-ether), poly(2-methylphenylene-1,4-ether), and poly(2-methylphenylene-1,4-ether). 6-ethylphenylene-1,4-ether), poly(
2-methyl-6-bropylphenylene-1,4-ether), poly(2,fl-dipropylphenylene-1,4
-ether), poly(2-methyl-6-butylphenylene-1,4-ether) and poly(2,6-cyptylphenylene-1,4-ether). Among them, poly(2,8-dimethylphenylene-1,4-ethyl) is preferred.

(2) Graft polymer (A) The graft polymer (A) is made of at least one rubber selected from the group consisting of butadiene rubber, acrylic ester rubber, ethylene-propylene rubber, and chlorinated polyethylene rubber. Examples include those obtained by graft copolymerizing styrene alone or styrene and at least one vinyl compound selected from the group consisting of 7-crylonitrile and methyl methacrylate.

(a) Butadiene rubber The butadiene rubber is a rubber whose main component is butadiene (60% by weight or more), including butadiene homopolymer rubber, copolymer rubber of butadiene and a small amount of styrene or acrylonitrile (SBR, NBR). ) Teal. It may be a copolymerized comb block copolymer rubber of butadiene and styrene, or it may be a random copolymer rubber.

(b) Acrylic ester rubber Also, acrylic ester rubber refers to an acrylic ester (for example, butyl acrylate) and a small amount (generally 10% by weight or less) of other monomers (for example, acrylonitrile). It is obtained by emulsion polymerization of and in the presence of a catalyst such as a persulfate, and is commonly referred to as acrylic rubber.

(C) Ethylene-propylene rubber Furthermore, ethylene-propylene rubber refers to ethylene-propylene copolymer rubber obtained by copolymerizing ethylene and propylene, and ethylene and propylene as main components, and 1.4- Straight or branched diolefins containing two double bonds at the ends, such as pentadiene, 1,5-hexadiene and 3,3-dimethyl-1,5-hexadiene, 1,4-hexadiene and 6 - Carbonization of linear or branched diolefins containing only one double bond at the end, such as methyl-1,5-hebutadiene, or cyclic dienes, such as bicyclo[2,2,1]-hebutene-2 and its derivatives. It is a multicomponent copolymer rubber obtained by copolymerizing a small amount (generally 10% by weight or less) of a monomer such as hydrogen. These copolymer rubbers and multicomponent copolymer rubbers preferably have a weight ratio of ethylene monomer units to propylene monomer units of 30/70 to 70/30. These ethylene-propylene rubbers are produced by copolymerization or multicomponent copolymerization of ethylene and propylene, or ethylene, propylene, and the above monomers using a catalyst system obtained from a transition metal compound and an organic aluminum compound.

(d) Chlorinated polyethylene rubber Also, chlorinated polyethylene rubber is obtained by chlorinating polyethylene powder or particles described below in an aqueous suspension, or
Alternatively, it can be obtained by chlorinating polyethylene dissolved in an organic solvent (preferably by chlorinating it in an aqueous suspension). Generally, amorphous or crystalline chlorinated polyethylene with a chlorine content of 20 to 50% by weight is used, and amorphous chlorinated polyethylene with a chlorine content of 25 to 45% by weight is particularly preferred.

The polyethylene is obtained by homopolymerizing ethylene or copolymerizing ethylene with at most 10% by weight of α-olefin (generally having at most 6 carbon atoms). Its density is generally between 0.910 and 0.910.
! 3? Og/cc. In addition, its molecular weight is 50,000 to 7
It is 00,000.

In producing the styrenic resin (B) of the present invention, among these rubber-like substances, those having a knee-to-knee viscosity of 20 to 140 are preferable, and in particular 30 to 120. Preferably. Further, these rubber-like materials are widely produced industrially and are used in a wide variety of fields. Their manufacturing methods, properties, and uses are widely known [for example, Shu Kanbara, "Synthetic Rubber/Document Book" (1961, published by Shokusen Shoten)].

(e) Production of graft polymer (A) The graft polymer (A) used in the present invention is obtained by graft polymerizing styrene alone or styrene and at least one other vinyl compound (acrylonitrile, methyl methacrylate) to the above-mentioned rubber. It is manufactured by

Graft polymerization methods include bulk polymerization, solution polymerization, emulsion polymerization, aqueous suspension polymerization, and methods that combine these graft polymerization methods (for example, after bulk polymerization,
There is a method of aqueous suspension polymerization). Generally, the amount of the rubber material used to produce 100 parts by weight of the graft polymer (A) is 3 to 40 parts by weight, preferably 5 to 35 parts by weight, particularly 5 to 30 parts by weight. It is suitable (using a relatively large amount of rubber-like material to produce a graft polymer containing a large amount of rubber-like material, and adding the above-mentioned homopolymer resin or copolymer of styrene, acrylonitrile, and methyl methacrylate to the graft polymer). Although resins may be mixed,
In this case, the amount of rubber-like material used is calculated based on the mixture). Furthermore, the molecular weight of monomers (styrene, acrylonitrile, methyl methacrylate) bonded to the rubber-like material as graft chains is usually 1000 to 30 (1,000
and particularly preferably 2000 to 200.000. In general, it is rare for seven polymers to bond completely to a rubber-like material, and there are cases where seven polymers do not bond to a graft material and a rubber-like material.
homopolymers or copolymers of These homopolymers and copolymers are used as they are without separation.

(f) Representative examples of graft polymers (A) Representative examples of graft polymers (A) produced as described above include butadiene homopolymer rubber, block or random copolymer rubber of styrene and butadiene (SBR)
By graft copolymerizing styrene and acrylonitrile to rrmm impact-resistant styrene resin (HIPS resin), butadiene homopolymer rubber, SBR, or acrylonitrile and butadiene copolymer rubber (NBR), obtained by graft copolymerizing styrene alone to The resulting acrylonitrile-butadiene-styrene ternary copolymer resin (ABS resin), butadiene homopolymer rubber or S
Methyl methacrylate obtained by graft copolymerizing styrene and methyl methacrylate to BR
Butadiene-styrene terpolymer resin (MBS resin),
Acrylonitrile-acrylic ester-styrene ternary copolymer resin (AAS resin) obtained by graft copolymerizing acrylonitrile and styrene onto acrylic acid ester rubber, and acrylonitrile and styrene copolymerizing with ethylene-propylene 5-based rubber. Graft copolymer resin (ABS resin) obtained by polymerization
, a graft copolymer resin (AC8 resin) obtained by graft copolymerizing styrene and acrylonitrile onto chlorinated polyethylene rubber (CPE), and a graft copolymer resin obtained by graft copolymerizing styrene and methyl methacrylate onto CPE. Polymer resin (
MCS resin).

(3) Graft polymer (B) The craft polymer (B) contains styrene alone or styrene and at most two alkyl groups having 1 or 2 carbon atoms in the PPO, acrylonitrile, methyl methacrylate, and butyl. It can be obtained by graft polymerization of at least one comonomer selected from the group consisting of acrylates.

(4) Styrene-containing polymer Furthermore, the styrene-containing polymer of the present invention is a styrene homopolymer or a copolymer with another double bond-containing organic compound containing at least 80% by weight of styrene. Representative examples of the organic compound having double bonds include ethylene, vinyl acetate, maleic anhydride, acrylonitrile, and methyl methacrylate. The molecular weight of the styrene-containing polymer is generally 50,000 to 300,
It is 000.

Methods for producing these styrene-containing polymers are widely known and used in many fields.

(D) Inorganic filler The inorganic filler used to produce the inorganic filler-containing phenylene oxide polymer layer is generally one widely used in the fields of synthetic resins and rubber. These inorganic fillers are preferably inorganic compounds that do not react with oxygen and water, and that do not decompose during crosstalk or molding. The inorganic fillers include metals such as aluminum, copper, iron, lead and nickel, oxides of these metals and metals such as magnesium, calcium, barium, zinc, zirconium, molybdenum, silicon, antimony and titanium, and their water. It is broadly classified into compounds such as hydrates (hydroxides), sulfates, carbonates, silicates, their double salts, and mixtures thereof. Typical examples of the inorganic fillers include the metals mentioned above, aluminum oxide (alumina), water products thereof, calcium hydroxide, magnesium oxide (magnesia), magnesium hydroxide, zinc oxide (zinc white), red lead, and white lead. Lead oxides such as magnesium carbonate, barium carbonate, basic magnesium carbonate, white carbon, asbestos, mica, talc, glass fiber, glass powder, glass peas, clay, diatoms, silica, wollastonite, oxidation Examples include iron, antimony oxide, titanium oxide (titania), lithopone, pumice powder, aluminum sulfate (gypsum, etc.), zirconium silicate, zirconium oxide, barium carbonate, dolomite, molybdenum disulfide and iron sand. Among these inorganic fillers, those in powder form preferably have a diameter of 1 mm or less (preferably 0.5 mm or less). In addition, fibrous materials have a diameter of 1 to 500 microns (preferably 1 to 300 microns) and a length of 0.1 to f(+
am (preferably 0.1 to 5+o+n) is desirable. Further, the diameter of the flat plate is 2111 m or less (preferably lam or less). (E) Structure of each layer (1) Thermoplastic resin layer The thermoplastic resin layer of the present invention has a diameter of 2111 m or less (preferably lam or less). It works to prevent the occurrence of. From this, the thickness is 5 microns to 5 mm, and the thickness is 10 microns to 5 mm.
(2) is preferred, particularly 10 microns to 1 mm. If the thickness of this thermoplastic resin layer is less than 5 microns, not only corrosion of the metal layer will occur, but also wear and exposure of the metal layer due to contact and friction with other articles during use. etc. occur and there is a problem. On the other hand, 5
If it exceeds mm, it is not preferable because not only the radio wave reflectance decreases but also the cost increases and the weight of the laminate increases.

(2) Metallic shaped article The metallic shaped article of the present invention can be made into a mat shape by a method such as plain weaving, twill weaving, tatami weaving, cotton weaving, twisted cotton weaving, triple weaving, clamp weaving, etc. It is woven or braided in the form of a cloth or cloth. The diameter of the fibrous material is usually 0.0020 to 1 mm, with a diameter of 0.0020 to 1 mm.
0.050-0.5 mm is preferred, especially 0.05 mm.
01 to 0.3 mm is suitable. Among these, those made of knitted steel wires are preferred because they have elasticity in the vertical and horizontal directions. If the diameter of the fibrous material is less than 0.0020 mm, it is difficult to process it into a mat, cloth or sheet shape. On the other hand, for those with a diameter exceeding 1 mm,
This not only increases the weight, but also increases the cost, and also causes problems when curved or curved γ is applied to the laminate. The size of the mesh of this metallic shape is important in determining the radio wave reflection performance. The size of the mesh is smaller than 2 meshes, preferably smaller than 4 meshes, and particularly preferably smaller than 8 meshes. If a metallic object with a rougher shape than 2 meshes is used, the reflectance of circularly polarized waves will be significantly reduced.

(3) Inorganic filler-containing phenylene oxide polymer layer The composition ratio of the inorganic filler in the inorganic filler-containing phenylene oxide polymer layer of the present invention is 10 to 80% by weight.
(That is, the composition ratio of the phenylene oxide polymer is 80 to 20% by weight), preferably 10 to 70% by weight, and particularly preferably 10 to 60% by weight. If the composition ratio of the inorganic filler in the inorganic filler-containing phenylene oxide-based polymer layer is less than 10% by weight, the linear expansion coefficient of the inorganic filler-containing phenylene oxide-based polymer layer is too different from that of the metal layer; There is a problem that not only may peeling occur between the metal layer and the inorganic filler-containing phenylene oxide polymer layer due to heat cycling, but also that the resulting laminate lacks rigidity. On the other hand, 8
If it exceeds 0% by weight, it will be difficult to produce a homogeneous composition, and even if a uniform composition is obtained, it will be difficult to produce a laminate by sheet production or injection molding as described below. , it is not possible to obtain a good product (laminate).

The thickness of this inorganic filler-containing phenylene oxide polymer layer is 500 microns to 15 mun, and 1-1
0 mm is desirable, and 1 to 7 mm is especially suitable.

If the thickness of the inorganic filler-containing phenylene oxide polymer layer is less than 500 microns, it is undesirable because it lacks rigidity and may be deformed or damaged by external force. On the other hand, IFvm
If it exceeds the above, it will take a long time to cool down during molding, and not only will sink marks be more likely to occur on the surface, but the weight will increase, causing problems in use.

In producing the thermoplastic resin layer and the inorganic filler-containing phenylene oxide polymer layer, stabilizers against oxygen, heat and ultraviolet rays, metal deterioration inhibitors, flame retardants, and colorants commonly used in the respective fields are used. Additives such as additives, electrical property improvers, antistatic agents, lubricants, processability improvers, and tack improvers are added to the compositions of the thermoplastic resin layer and the inorganic filler-containing phenylene oxide polymer layer of the present invention. It may be added within a range that does not impair the properties it has.

When blending the above-mentioned additives into the thermoplastic resin of the present invention and when producing an inorganic filler-containing phenylene oxide polymer (including cases where the above-mentioned additives are blended), the additives commonly used in the respective industries are used. Tri-blending may also be performed using a mixer such as a Henschel mixer.
It can be obtained by melt-kneading using a mixer such as a Banbury mixer, Nigoo, roll mill, or screw extrusion mill. At this time, a homogeneous composition can be obtained by triblending in advance and melt-kneading the resulting composition (mixture).

In particular, it is preferable to use the phenylene oxide polymer in the form of powder because it can be mixed more uniformly.

In this case, the mixture is generally melt-kneaded, then molded into pellets, and subjected to the molding described later.

In producing the inorganic filler-containing phenylene oxide polymer of the present invention, all the ingredients may be mixed at the same time, or some of the ingredients may be mixed in advance to produce a so-called masterbatch, and the resulting master The batch and remaining formulation ingredients may be mixed.

When melt-kneading is used to produce the following compounds, it must be carried out at a temperature higher than the melting point or softening point of the thermoplastic resin or phenylene oxide polymer used; however, if carried out at high temperatures, the thermoplastic Resin and phenylene oxide polymer deteriorate. For these reasons, it is generally 20°C higher than the melting point or softening point of the respective thermoplastic resin or phenylene oxide polymer.
It is carried out at high temperatures (preferably above 50° C.), but within a temperature range that does not cause deterioration.

(F) Reflector for Circularly Polarized Antenna The reflector for circularly polarized antenna of the present invention will be explained below with reference to FIGS. 1 to 3. FIG. 1 is a partial perspective view of an antenna to which a reflector for a circularly polarized antenna is attached. FIG. 2 is a sectional view of the reflector for the circularly polarized antenna. Also, the third
The figure is a partially enlarged view of the sectional view. In FIG. 1, A is a reflector for a circularly polarized antenna of the present invention, B is a converter, C is a converter support rod, and D is a reflector support rod. Further, E is a wiring. Further, in FIG. 2, l is a layer consisting of a thermoplastic resin layer and a metallic shaped object (a primer may be interposed between them), and II is a phenylene oxide polymer layer containing an inorganic filler. It is. Furthermore, in FIG. 3, 1 is a phenylene oxide polymer layer containing an inorganic filler,
2 is a metal shaped object. Moreover, 3 is a thermoplastic resin layer with excellent weather resistance. Further, 2a and 2b are single layers of primer. As is clear from these drawings, the feature of the reflector for a circularly polarized antenna of the present invention is that it has a structure consisting of at least three layers.

In addition, the reflector plate for a circularly polarized antenna of the present invention has adhesion between each layer between the thermoplastic resin layer with excellent weather resistance and the metallic shape, and between the metallic shape and the inorganic filler-containing phenylene oxide polymer layer. A primer can also be used to strengthen the strength. Furthermore, in order to attach the reflector for a circularly polarized antenna of the present invention to a support, ribs may be provided to the phenylene oxide polymer layer containing an inorganic filler to enable attachment. It is also possible to add reinforcing ribs to strengthen the structure. Furthermore, it is also possible to drill holes in the circularly polarized antenna support obtained by the present invention and attach various support attachment parts using bolts, nuts, etc. Additionally, the diameter of the reflector for the circularly polarized antenna is usually 80cm to 120cm.
It is.

(G) Method for manufacturing a reflector for a circularly polarized antenna The reflector for a circularly polarized antenna of the present invention is produced by manufacturing a metal shape that is laminated in advance, and then using the laminated metal shape by a vacuum forming method. , a stamping molding method, an injection molding method, or the like. Manufacturing methods using these molding methods will be explained in more detail.

(1) Method for manufacturing a laminated metallic object In the present invention, laminating a thermoplastic resin onto the metallic object can be achieved by applying a commonly practiced method. The method will be explained in detail below.

The method of laminating (adhering) the thermoplastic resin layer with excellent weather resistance and the metallic shape can generally be carried out by dry lamination, but extrusion in a thermoplastic resin at high temperature is generally possible. For phenylene oxide polymers that can be used, the thermoplastic resin layer and the metallic shape can be laminated (adhered) by extrusion lamination. To manufacture laminated metal shapes using the extrusion lamination method, use a T-Gui film molding machine and set the resin temperature to 240~240℃.
It may be extruded to the above-mentioned thickness at a temperature of 370° C. and at the same time be bonded to a metal shape using a cooling pressure roll.

When using a thermoplastic resin that has excellent adhesion to a metallic shape, a laminated metallic shape can be produced as described above. However, when using a thermoplastic resin whose adhesion to metallic objects is not fully satisfactory, a primer (anchor coating agent) commonly used in the field of thermoplastic resins is applied in advance to the metallic object. Apply to one side of the object by gravure coating method or perspective coating method and dry at 50 to 100°C.6 Then, heat a thermoplastic resin film or sheet to the primer side of the metal shape at 50 to 100°C. It is crimped using a crimped roll. The primer differs depending on the type of thermoplastic resin used to form the thermoplastic resin layer, but it is commonly used in various fields, and there are aqueous types and solvent types. The types include vinyl, acrylic, polyamide, epoxy, rubber, urethane, and titanium.

(2) Manufacturing by vacuum forming method To manufacture by this method, a primer is applied to one side of the metal shape laminated with the thermoplastic resin layer obtained as described above, and then a phenylene oxide containing an inorganic filler is applied. When the polymer is extruded into a sheet using the T-die molding method, by laminating it on one side, a thermoplastic resin layer with excellent weather resistance, a metallic shape, and a phenylene oxide polymer layer containing an inorganic filler are sequentially formed. A laminated laminate is obtained. The laminate (sheet) obtained in this way is fixed with iron workpieces or claw-like objects, placed in a jig that is easy to handle, and heated with ceramic heaters or sheathed wire heaters arranged vertically. Pull it into a device that can heat it. When the sheet is heated, it begins to melt, but at that time, the sheet sag by a certain degree, and then, when heating is continued, it becomes taut in the wafer that is holding it down. When this stretching phenomenon is observed, the best timing for sheet molding is when the molded product is in a good heating state without wrinkles or uneven thickness. At this time, the desired molded product is obtained by pulling out the sheet work, placing it on the upper part of the mold, and performing vacuum forming from the mold side under a reduced pressure of one atmosphere. Then, the product is cooled by wind or water spray and released from the mold.

On the other hand, in compressed air forming, the sheet that is easier to mold is pulled out to the top of the mold, a chamber (box) for compressed air is placed over the sheet, and the sheet is pressed against the mold side with a pressure of 3 to 5 atm. A molded product can be obtained by pushing up the mold together with the mold.

In addition, in any molding method, the surface temperature of the sheet is 150°C.
A preferred temperature is ~250°C.

(3) Manufacturing by stamping molding method To manufacture the circularly polarized antenna reflector of the present invention by this method, the weather-resistant A laminate sheet in which a superior thermoplastic resin layer, a metallic shape, and an inorganic filler-containing phenylene oxide polymer layer are sequentially laminated is introduced into a drawing die attached to a vertical pressing machine.
5-50kg/cm' (preferably 10-20k
The desired molded product is obtained by heating and pressing under a pressure of g/cm'). A product is then obtained by cooling with air or water spray and releasing from the mold. During molding, the pressurizing time is usually 15 seconds or more, typically 15 to 40 seconds. Further, in order to improve surface properties, it is preferable to perform molding under two-step pressure conditions. In this case, the first stage is 10 to 20 kg/cm'
After pressurizing for 15 to 40 seconds under a pressure of 40 to 5
A molded product with excellent surface smoothness can be obtained by applying pressure for 5 seconds or more under a pressure of 0 kg/cm'. This two-step molding method is particularly desirable when using an inorganic filler-containing phenylene oxide polymer layer with poor fluidity.

In addition, the molding temperature in the stamping molding method is the surface temperature of the sheet when a propylene polymer containing propylene as the main component is used as the phenylene oxide polymer containing an inorganic filler or the phenylene oxide polymer in the 1-side polymer layer. The optimum temperature is 125-135°C. Also,
When using an ethylene polymer containing ethylene as a main component, a suitable surface temperature of the sheet is 85 to 110°C.

(4) Manufacture by injection molding method In order to manufacture the reflector plate for a circularly polarized antenna of the present invention by injection molding method, a thermoplastic resin layer with excellent weather resistance is laminated on one side in advance, and a primer layer is placed on the other side. Insert injection molding is performed on the metal shape coated with the coating when forming a reflector for a circularly polarized antenna. To perform insert injection molding, the metal shape is inserted between the male and female molds of an injection molding machine so that the thermoplastic resin layer with excellent weather resistance is on the male mold side. insert) and close the mold. Thereafter, the inorganic filler-containing phenylene oxide polymer is filled into the mold through the gate of the mold, and after cooling, the mold is opened to obtain the desired reflector for a circularly polarized antenna. . For insert injection molding, the resin temperature is higher than the melting point of the inorganic filler-containing phenylene oxide polymer, but lower than the thermal decomposition temperature of the phenylene oxide polymer. When a propylene polymer is used as the phenylene oxide polymer, insert injection molding is preferably carried out at a temperature in the range of 170 to 290°C. On the other hand, when an ethylene polymer is used as the phenylene oxide polymer, insert injection molding is carried out at a temperature of 120 to 250°C. In addition, if the injection pressure is 40 kg/cm or more at the gauge pressure at the nozzle part of the cylinder of the injection molding machine, the inorganic filler-containing phenylene oxide polymer can be shaped into a shape almost similar to that of the mold. Not only can this be done, but also a product with good appearance can be obtained. Injection pressure is generally 40 to 140 kg/cm
', particularly preferably 70 to 120 kg/cm'.

[VI] Examples and Comparative Examples The present invention will be explained in more detail with reference to Examples below.

In the Examples and Comparative Examples, the radio wave reflectance was measured as a microwave reflection coefficient based on the voltage standing wave ratio when a rectangular waveguide was used and the tip of the waveguide was short-circuited. Weather resistance tests were conducted using a Sunshine Carbon Weather Meter under the conditions of a black panel temperature of 83°C and a due cycle of 12 minutes/(80 minutes of irradiation).
After a period of time, the external appearance of the surface (adverse changes such as discoloration, fading, gloss change, crazing, blistering, peeling of metal foil, cracking, etc.) was evaluated. Furthermore, the heat cycle test tested the sample at 80%
°C for 2 hours, followed by gradual cooling to -4560 over 4 hours, exposure to this temperature for 2 hours, and then gradual heating to 80 °C over 4 hours, after 100 cycles of this cycle. The appearance of the surface of the sample was evaluated in the same manner as in the weather resistance test. Peel strength was measured by cutting a test piece with a width of 15IIIm from a manufactured reflector for a circularly polarized antenna, and peeling a metallic object at 180 degrees at a peeling speed of 50 mm/min in accordance with ASTM D-903. Evaluation was made based on the strength when peeled off. Furthermore, the bending stiffness is AST
Measured according to M D-7f30, the coefficient of thermal expansion is A
Measured according to STM D-EII3B.

In addition, the thermoplastic resin of the thermoplastic resin layer used in the examples and comparative examples, the phenylene oxide polymer,
The types and physical properties of the inorganic fillers and metallic shapes are shown below.

[(A) Thermoplastic resin] As a thermoplastic resin, melt flow rate (ASTM
D-1238, 0.4 weight of polyvinylidene fluoride (hereinafter referred to as rPVdFJ), a benzotriazole-based ultraviolet absorber, with a weight of 8.1 g (measured at a temperature of 250°C and a load of 10 kg) for 710 minutes. % and 0.5% by weight of carbon black [melt flow index (JIS K
-8758 at a temperature of 230°C and a load of 2
．． Measured under the condition of 18 kg, hereinafter referred to as rMFIJ) is 0.5 g/10 minutes, hereinafter referred to as r2P(A) J], benzotriazole-based ultraviolet absorber is 0.4% by weight and 0.5% by weight. High-hazard polyethylene I containing carbon black of density 0.958 g/cm'.

The melt index (measured according to IrS K-87ElO at a temperature of 190°C and a load of 2.18 kg, hereinafter referred to as rM, 1.J) is 0.8 g/
10 minutes, hereinafter referred to as r HOPE (1)] As a mixture, chlorinated polyethylene (chlorine content 1 star 3.15% by weight, amorphous, raw material polyethylene molecular weight approximately 20 10,000 parts by weight and 80 parts by weight of acrylonitrile-styrene copolymer resin (containing acrylonitrile (-23%) and a dibutyl tin malate stabilizer (manufactured by Sankyoki Gosei Co., Ltd.) with two claws as a stabilizer. , Product name Stann B
M ] using a roll (surface temperature 180°C) to
The resulting composition (r AC9J
100 parts by weight of vinyl chloride homopolymer (degree of polymerization 1100, hereinafter rpvc ”
A mixture of these ingredients was used.

[(B) Phenylene oxide polymer copoly In order to produce a phenylene oxide polymer, styrene resin, HIPS, ABS resin, ABS resin, AAS resin, AES resin, AC8 resin PPO and modified PP0 ( (grafted product) was produced.

[(1) Styrene Resin (PS)] As a styrene resin, styrene was suspended in water, an emulsifier and a catalyst were added, and the mixture was polymerized at a temperature of 80°C. As a result, the Melt Fist Flow Index (JIS K-
According to 8870, the temperature is 180°C and the load is 1
A styrene resin (hereinafter referred to as rPSJ) having a weight of 13.0 g/10 minutes (measured under the condition of 0 kg) was manufactured and used.

[(2) Styrenic resin (HIPS)] As the styrene resin, 8.1 parts by weight of styrene-butadiene random copolymer rubber [styrene content 25.3% by weight, Mooney viscosity (ML1+4) 25, hereinafter referred to as rSBRJ] 1 and 92 parts of styrene were graft-polymerized to produce impact-resistant polystyrene (hereinafter referred to as "HIPSJ") having a melt flow index of 13 and an Ogyto part.

[(3) ABS Resin J 280.0 g (as solid content) of styrene-butadiene copolymer rubber (butadiene content: 80 tonne weight, rubber gel content: 80%) in a 20-liter stainless steel autoclave, 2. 0g ammonium persulfate, 80.0g
of disproportionated sodium rosinate, 21.0 g of lauryl mercaptan, and 8.0 g of water were charged and stirred uniformly. To this, 2520 g of styrene and 1
Add 200g of acrylonitrile and stir, then
The mixture was heated to 70°C for 7 days while stirring.

Polymerization was carried out at this temperature for 10 hours with stirring. Then, a 5% aqueous solution of aluminum sulfate was added to the latex-like material containing the polymer (graft material) obtained as described above, and the obtained graft material was coagulated. This coagulated material was dissolved in an aqueous solution of about 1% sodium hydroxide.
Wash using a sentence, and also 70 of many no (about 30Q,)
Washed using warm water at °C. Approximately 80% of this graft
Drying was carried out under reduced pressure at ℃ overnight. the result,
3'785 g of a white powdery graft product was obtained. The Izotsu impact strength of the obtained graft was 7.5 kg.
cm/cm-notch, and the tensile strength is 4f18kg/
It was cm'. Moreover, the Vicat softening point of this polymer was 101.5°C. The content of rubbery substances in this graft was 7.3% by weight. Hereinafter, this grafted product will be referred to as rABsJ.

[(4) MBS resin 1 Aqueous dispersion 12 containing 1380 g of butadiene-styrene copolymer rubber (Mooney viscosity 50) consisting of 7665% by weight of butadiene and 23.5% by weight of styrene;
Ou was placed in a 20-liter stainless steel autoclave. Under a nitrogen stream, while maintaining the temperature at eo=c, an aqueous solution prepared by dissolving 480 g of sodium formaldehyde sulfoxylate dihydrate in about 2.4 g of water and 1 eo, og of cumene hydroperoxide were added, and the mixture was heated for 1 hour. Stirred. Then, 7880 g of methyl methacrylate and 3
A mixed solution with 2.0 g of cumene hydroperoxide was added to carry out polymerization.

After about 7 hours, the polymerization softening rate reached 91.8%. A mixed solution of 6880 g of styrene and 32.0 g of cumene hydroperoxide was added to this reaction system to carry out polymerization. After about 6 hours, the polymerization softening rate reached 83.3%. An aqueous solution of hydrochloric acid and sodium chloride (salt) was added to this liquid to solidify it. The precipitate was then filtered, thoroughly washed with hot water, and then dried at a temperature of about 80' Cj under 3 reduced pressures for one day and night. As a result, a white powdery polymer (graft product) was obtained. The Izo-Sito impact strength of the obtained grafted material was 7.6 kg・cm
/cm-notsuchi, and one bow of strong melon weighs 415kg/c.
It was m'. The Vicat softening point of this graft is 8
The temperature was 7.2°C. The obtained graft product (hereinafter referred to as rMB
sJ) had a rubbery content of 9.6% by weight.

[(5) A A s resin j 20 8.0 u of ZA in my father's stainless steel autoclave
V'J water, 24.0 g of sodium dodecylbenzenesulfonate, 0.80 g of ammonium persulfate as a polymerization catalyst, and 784 g of acrylic butybutyl ester and lB, og of glycidyl methacrylate as monomers were charged and heated at 77 °C. Polymerization was carried out with stirring until the polymerization was almost completed to produce an acrylic ester rubber.1680 g of styrene and 72 g of styrene as monomers were added to the Togane system containing the acrylic ester rubber.
18.0 g of acrylonitrile and as a polymerization catalyst.
0 g of potassium persulfate was added and polymerization was carried out at 83° C. with stirring for 10 hours. As a result, an emulsion polymer (grafted product) containing almost no unreacted monomers is produced.
was gotten.

Add a sulfur-resistant aluminum hanger to the emulsion containing this graft material.
A 5% aqueous solution of was added dropwise with stirring to precipitate the polymer (graft material). Next, after dehydrating this hydrous polymer by centrifugation, and washing this polymer thoroughly with water,
Drying was carried out under reduced pressure at approximately 50°C. The Izot impact strength of this graph I is 24.8 kg a cm
/cm-notch, tensile strength is 350kg/c
It was m'. Moreover, the softening point was 87.6°C.

The content of rubbery substances in this grafted product (hereinafter referred to as rAAS J) was 23.8%.

[(Ft)AES resin 1 20 5350 as a monomer in the above autoclave
g of styrene, Mooney viscosity [ML, +
4 (100°C)] is 45 (non-covalent diene component ethylidene norbornene, iodine value 25) 1500 g and 1.0 kg
of n-hebutane was charged. After purging the inside of the autoclave with nitrogen, stirring was performed at 50°C for 2 hours to completely dissolve the ethylene-propylene-diene ternary copolymer rubber in styrene. After adding 2150 g of acrylonitrile as a monomer to this reaction (polymerization) system, the mixture was thoroughly stirred to prepare a homogeneous solution. To this solution, 5.0 g of terpinolene and 5.0 g of di-tertiary-butyl peroxide and 1.3 g of tertiary-butyl peracetate were added as catalysts, and the temperature of the polymerization system was raised to 97°C. Bulk polymerization was carried out for 7 hours and 20 minutes while controlling the temperature at this temperature under nitrogen pressurization conditions of 1 kg/cm'.

Approximately 30 minutes before the end of polymerization, 15.0 g of di-sec-butyl peroxide and 15.0 g of terpinolene were added to 500 g of
g of styrene and this solution was added. The syrup thus obtained (containing the polymer) was mixed with 111 g of water (containing 25 g of acrylic acid-acrylic acid ester copolymer as a suspending agent) and 30 g. The autoclave was transferred to a 1-liter autoclave, and the atmosphere was replaced with nitrogen. This aqueous suspension was heated to 130°C.
Suspension polymerization was carried out for 2 hours with vigorous stirring. Then, the temperature was raised to 150'O and stripping was performed for 1 hour. The obtained polymer (graft-blend) was thoroughly washed with water and then dried at 100°C. As a result, 8.28 kg of graft-blend (
Hereinafter referred to as rAESJ) was obtained. The content of rubbery substances in this AES was 16.0% by weight. The AES 1ljjR strength is 37. l11kg・am/c
M-notch, tensile strength is 350kg/cm'
Met. In addition, the cut softening point was 88.0°C.
00) is 76 chlorinated polyethylene [chlorine content 40].

6% by weight, the molecular weight of the raw material polyethylene is approximately 200,000, hereinafter referred to as "rax-pE(a)"] 1600g, polyvinyl alcohol (saponification degree 85%) 32.0g and 8.0 grams of water (ion-exchanged water) I prepared it. This was then vigorously stirred at room temperature (approximately 23°C). This variance 1
4560g of monomer without stirring at room temperature
of styrene and 1520 g of acrylonitrile, 320 g of liquid paraffin as a lubricant, and 11 as a polymerization initiator.
3.0 g of tertiary-natyl peracetate and If(,Og of tertiary-dodecyl mercaptan as a chain transfer agent) were added. After replacing two parts of the reaction suspension with nitrogen gas, The temperature was raised to 105°C. After polymerization was carried out for 4 hours with stirring at this temperature, the temperature was further increased to 145°C.
Polymerization was carried out for 2 hours at a temperature of °C. After this reaction system was allowed to cool to room temperature, the obtained polymer (graft material) was filtered and thoroughly washed with water. The obtained graft material was dried at 50° C. under day and night pressure. Polymerization conversion rate (relative to monomer used in polymerization)
was 85.4%, and was in the form of a slightly coarse powder. In addition,
The content of rubbery substances in this graft product (hereinafter referred to as rAGs J) was 20.3% by weight.

[(8) PPO] 2,6-xylenol was polycondensed by an oxidative coupling method to obtain poly2,6-dimethylphecolene-l,4-ether [intrinsic viscosity (measured at 30°C in chloroform,
Unit: d sentences/g) 0.53, hereinafter referred to as rPPOJ]
was manufactured.

[(8) Modified PPO' (grafted product) 1100 parts by weight of PPO, 25 parts by weight of styrene monomer, 10 parts by weight of PS produced in the above (A), and 2.1 parts by weight of di-tertiary - Butyl peroxide was mixed for 10 minutes using a Henschel mixer, then mixed using a twin screw extruder (diameter 30 mm).
, resin temperature 270°C) using a styrene graph HP
A poi compound [hereinafter referred to as modified PPO J] was produced.

[(C) Inorganic filler] As the inorganic filler, talc with an average particle size of 3 microns (aspect ratio of about 7), mica with an average particle size of 3 microns (aspect ratio of about 8), glass fiber (single fiber) Calcium carbonate (hereinafter referred to as rcacQs J ) with a diameter of 11 microns, a force length of 3+ nm, hereinafter referred to as rGFJ), and an average particle size of 0.8 microns.
was used.

[(D) Metallic shaped object] As a metallic shaped object, each fiber diameter is about 0.3 mm.
A 40-mesh plain weave wire cloth made of aluminum (hereinafter referred to as rA4J), copper, shibado, and silver was used.

Examples 1 to 12, Comparative Example 1.2 The thermoplastic resin was molded to produce films each having a thickness of 20 microns. In addition, an acrylic primer (manufactured by Showa Kobunshi Co., Ltd., trade name Vinyroll 92T) was applied to one side of each metal shape to a thickness of 20 microns, and a urethane primer (Toyo Morton Co., Ltd.) was applied to the other side. (trade name: ATOCOTE 335) manufactured by ATOCOTE, Inc., was applied to a thickness of 20 microns on each surface and dried (in Examples 7 and 10, the urethane-based primer was applied on both sides). Furthermore, the inorganic filler and phenylene oxide polymer component (the types of each inorganic filler and phenylene oxide polymer and the content of the inorganic filler in the composition are shown in Table 1. Comparative Example 2
(without inorganic filler) were triblended using a Henschel mixer for 5 minutes each, and each mixture was manufactured using a vented extruder at a resin temperature of 250 °C ( , in Example 11, PPO and P
In Example 12, modified PPO and PS were mixed in advance, and the resulting mixture (composition) and inorganic filler were similarly triblended and mixed while extruding.

A sheet having a thickness of 2 mm was produced from each of the obtained compositions (pellets) using a T-Guy molding machine.

The thermoplastic resin film produced in this manner (not used in Comparative Example 1), a metallic shape coated with a primer on both sides, and a phenylene oxide polymer sheet containing an inorganic filler were used. The laminate was manufactured by adhering by dry lamination method. The obtained laminate was vacuum-formed at 180°C (the surface temperature of the laminate) using a bowl-shaped female mold (outer diameter 750 mm, height 80 mm) to form a circularly polarized antenna. A reflector was manufactured (Example 1, 2).

Laminates produced in the same manner as in Examples 1 and 2 (the types of inorganic fillers and phenylene oxide polymers, the content of inorganic fillers in the composition, and the types of metallic shapes are shown in Table 1). ) when the surface temperature is 1?
The first stage weighs 20 kg/c rn' under 0'C condition.
a) Stamping molding is performed in two stages by holding the second stage under a pressure of 50 kg/cm' for 20 seconds (the shape of the mold is the same as in Example 1),
A reflector for a circularly polarized antenna was manufactured (Example 3.4)
.

After applying the above acrylic primer to one side of each metal shape whose type is shown in Table 1 to a dry thickness of 20 microns, apply each thermoplastic resin whose type is shown in Table 1. film (20 microns thick) was laminated. A urethane primer was applied to the other surface of the obtained laminate in the same manner as in Example 1. Each coated laminate thus obtained was inserted into an injection molding machine (clamping force 1500 m) so that the thermoplastic resin film was in contact with the male mold surface of the mold. After closing the mold, the injection pressure is 80kg/cm' and the resin temperature is 260°C.
Example 1 was obtained by insert injection molding a composition whose types of phenylene oxide resin and inorganic filler and the content of the inorganic filler in the composition are shown in Table 1 under the following conditions. A reflector for a circularly polarized antenna having the same shape was manufactured (Examples 5 to 12. Comparative Example l
, 2).

The elastic modulus and linear expansion coefficient of the inorganic filler-containing phenylene oxide polymer layer of each reflector for a circularly polarized antenna obtained as described above and the metallic shape of the inorganic filler-containing phenylene oxide polymer layer The peel strength of the product was measured. The results are shown in Table 1.

When the radio wave reflectance of each of the circularly polarized antenna reflectors obtained as described above was measured, it was 98%. Furthermore, weather resistance tests and heat cycle tests were conducted, but no harmful changes such as discoloration, fading, change in gloss, crazing, blistering, peeling of metallic shapes, and cracks were observed on the surfaces of all cases except for Comparative Example 1. There wasn't. However, in Comparative Example 1, the aluminum shape on the surface corroded.

[Brief explanation of drawings]

FIG. 1 is a partial perspective view of an antenna to which a typical reflector for a circularly polarized antenna manufactured according to the present invention is attached. Moreover, FIG. 2 is a sectional view of the reflector for the circularly polarized antenna. Furthermore, FIG. 3 is a partially enlarged view of the cross-sectional view. A...Reflector for circularly polarized antenna, B...Converter, C...Converter support rod, D...Reflector support rod, E...Wiring, ■...Thermoplastic resin layer and Layer consisting of a metallic shape, II... Inorganic filler-containing phenylene oxide polymer, ■ Inorganic filler-containing phenylene oxide polymer layer, 2... Metallic shape, 3... Thermoplastic resin layer with excellent weather resistance, 2a...
Primer 1st layer, 2b... Primer 1st layer patent applicant Showa Denko Co., Ltd. Agent Patent attorney Sei Kikuchi - Figure 3

Claims (1)

[Claims] At least (A) a thermoplastic resin layer with good weather resistance (B)
) A laminate formed by sequentially laminating at least one shaped object selected from the group consisting of metallic mats, cloths and nets and (C) an inorganic filler-containing phenylene oxide polymer layer, the thermoplastic resin The layer thickness is 5 microns to 5 mm and is made of metallic pine)
・Cross and net are finer than 2 meshes,
The thickness of the inorganic filler-containing phenylene oxide polymer layer is 500 microns to 15 mm, the content of the inorganic filler in this layer is 10 to 80% by weight, and the phenylene oxide polymer is phecolene oxide. at least one type of heat selected from the group consisting of a polymer containing at least styrene and a polymer obtained by grafting a vinyl compound containing at least styrene to a condensate containing a rubber-like material and/or a phenylene oxide-containing condensate; Although it is a plastic resin, the content of the phenylene oxide-containing condensate and the phenylene oxide-containing condensate grafted with a vinyl compound containing at least styrene in this phecolene oxide-based polymer is at least as high as their total jlIj. A reflector for a circularly polarized antenna, characterized in that the content is 5.0% by weight.