Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L101/00—Compositions of unspecified macromolecular compounds
  • C08L101/12—Compositions of unspecified macromolecular compounds characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2300/00—Characterised by the use of unspecified polymers
  • C08J2300/12—Polymers characterised by physical features, e.g. anisotropy, viscosity or electrical conductivity

Definitions

• the present invention relates to a planar connector having a lattice structure inside an outer frame such as a CPU socket.
• Liquid crystalline polymer is known as a material that has excellent dimensional accuracy, vibration damping properties, and fluidity among thermoplastic resins and has extremely low burr generation during molding.
• liquid crystalline polymers have been widely used as materials for various electronic components.
• a liquid crystalline polymer composition reinforced with glass fiber has been adopted as a connector.
• the pitch interval of the grid part required in recent years is 2 or less, and the thickness of the resin part of the grid part holding the terminal
• its performance was insufficient for use as a very thin flat connector with a thickness of less than 0.5 sq.m. That is, in such a very thin planar connector having a lattice portion, if the lattice portion is to be filled with resin, the fluidity is not sufficient. Therefore, there is a problem in that the filling pressure is increased, and the resulting warpage of the flat connector is increased.
• liquid crystalline polymer composition with good flowability with a small amount of glass fiber added.However, such a composition results in insufficient strength and reflow during mounting. This causes a problem of deformation.
• the pitch of the lattice portion is 2 mm or less, and the thickness of the lattice portion is 0 mm.
• the pitch of the lattice portion is 2 mm or less, and the thickness of the lattice portion is 0 mm.
• the present inventors have conducted intensive searches and studies to provide a liquid crystal polymer planar connector having an excellent balance of performance, and found that the fibrous compound to be blended in the fiber reinforced liquid crystal polymer composition was When the weight average length of the filler and the amount of the filler are in a certain relationship, it was found that a flat connector having good moldability and excellent in all properties such as flatness, warpage and heat resistance was obtained.
• the present invention has been completed.
• the present invention provides (A) a liquid crystalline polymer, (B) a fibrous filler, and (C) a composite resin composition (provided that (B) the amount of the fibrous filler and the weight average length thereof are The relationship is a planar connector having a lattice structure inside the outer frame, which is formed from the following area (D that satisfies the definition of the area (D)).
• the X-axis is calculated based on (B) the amount of the fibrous filler ((C)% by weight in the composite resin composition), The area surrounded by the following functions (1) to (5), where the Y axis is (B) the weight average length of the fibrous filler ( ⁇ ⁇ ⁇ )
• the present invention is also an application of the (C) flat connector having a lattice structure inside the outer frame of the composite resin composition.
• FIG. 1 is a view showing a region which is a relationship between a blending amount of a fibrous filler and a weight average length in a composite resin composition specified in the present invention.
• FIGS. 2A and 2B are diagrams showing a planar connector 1 formed in the embodiment, where FIG. 2A is a plan view, FIG. 2B is a right side view, FIG. 2C is a front view, and FIG. (E) is a diagram showing the details of part B.
• the unit of the numerical value in the figure is the thigh.
• FIG. 3 is a diagram schematically showing the screw of the extruder used in the example.
• the liquid crystalline polymer (A) used in the present invention refers to a melt-processable polymer having a property capable of forming an optically anisotropic molten phase.
• the properties of the anisotropic molten phase can be confirmed by a conventional polarization inspection method using a crossed polarizer. More specifically, the anisotropic molten phase can be confirmed by using a Leitz polarizing microscope and observing the molten sample placed on the Leitz hot stage at a magnification of 40 times in a nitrogen atmosphere.
• a liquid crystalline polymer applicable to the present invention is inspected between orthogonal polarizers, even if it is in a molten stationary state, polarized light is normally transmitted, and it exhibits optical anisotropy.
• the liquid crystal polymer (A) as described above is not particularly limited, but is preferably an aromatic polyester or an aromatic polyesteramide, and the aromatic polyester or the aromatic polyesteramide is partially contained in the same molecular chain. Included polyesters are also in that range. These are preferably at least about 2.0 dl / g, more preferably 2.0-1.0 dl Zg, when dissolved at a concentration of 0.1% by weight in pentafluorophenol at 60 ° C. Those having a logarithmic viscosity (I.V.) are used.
• the aromatic polyester or aromatic polyesteramide as the liquid crystalline polymer (A) applicable to the present invention is particularly preferably at least one selected from the group consisting of aromatic hydroxycarboxylic acids, aromatic hydroxyamines, and aromatic diamines. Aromatic polyesters and aromatic polyesteramides having at least one kind of compound as a constituent component. More specifically,
• the specific compound constituting the liquid crystalline polymer (A) applicable to the present invention include aromatic hydroxycarboxylic acids such as p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid; —Dihydroxynaphthalene, 1,4-dihydroxynaphthylene, 4,4′-dihydroxybiphenyl, hydroquinone, resorcinol, aromatic diols such as compounds represented by the following general formulas (I) and (II) Terephthalic acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 2,6-naphthalenedicarboxylic acid and compounds represented by the following general formula ( ⁇ ); Aromatic dicarboxylic acids; examples thereof include aromatic amines such as P-aminophenol and P-phenylenediamine.
• liquid crystalline polymers (A) to which the present invention is applied are aromatic polyesters containing p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid as main constituent units.
• the (C) composite resin composition used in the present invention is obtained by blending (B) a fibrous filler with the above (A) liquid crystalline polymer. It is essential that the relationship with the weight average length satisfies the requirements of the following area (D).
• the X axis is (B) the amount of the fibrous filler (% by weight in the composite resin composition), and the Y axis is (B) the weight average length ( ⁇ m) of the fibrous filler. Area enclosed by functions (1) to (5)
• weight average length of the fibrous filler is less than 160] II, the reinforcing effect is small, and the desired effect cannot be obtained even if the amount of the filler is increased. Also, (ii) if the weight average length of the fibrous filler exceeds 360 / _im, the fluidity will deteriorate even if the blending amount is reduced, and a connector with excellent flatness will not be obtained.
• the term “( ⁇ ) weight average length of the fibrous filler” in the present invention is a value in a molded article, and can be measured by a method described later.
• the fiber diameter of the fibrous filler is not particularly limited, but generally about 5 to 15 m is used. '
• fibrous filler (B) used in the present invention examples include glass fibers, carbon fibers, whiskers, inorganic fibers, and ore fibers. Glass fibers are preferred.
• a composition having such an apparent melt viscosity uses a liquid crystalline polymer having a general melt viscosity (10 to 100 Pa ⁇ s, preferably 10 to 40 Pa ⁇ s). It is obtained when (B) fibrous filler is blended within the range satisfying the conditions.
• the method for obtaining such a composition is not particularly limited, but melt kneading using an extruder is generally used. However, in many cases, it cannot be obtained by the usual extrusion method in which the fibrous filler is fed from the side to the molten liquid crystalline polymer. For this reason, the liquid crystalline polymer composition containing the fibrous filler once melt-kneaded is melt-kneaded again, and the liquid crystalline polymer in the form of pellets (particle size of 1 thigh or more) is mixed with the fibrous filler from the side. It is necessary to use a feeding method or the like. Preferably, a method of feeding a pellet-like liquid crystalline polymer from the side having a small heat history is used.
• the extruder to be used is preferably a twin-screw extruder with a side feed.
• planar connector is a connector as shown in FIG. 2 molded in the embodiment, and it has several hundred pins in a product of about 40 thighs x 40 marauders x 1 thigh. It has a number of holes.
• the planar connector according to the present invention may have an opening of an appropriate size in the lattice.
• the pitch interval of the grid portion is less than 2 mm (1.2 mm), and the thickness of the resin portion of the grid portion holding the terminals is reduced. It is possible to mold very thin flat connectors with a moldability of less than 0.5 (less than 0.18 ⁇ ) and excellent flatness.
• the flatness before going through one IR riff opening process for surface mounting at a peak temperature of 230 to 280 ° C is 0.09 or less, and If the difference between the front and rear flatness is not more than 0.02 s, it can be said that it has practically excellent flatness.
• a molding method for obtaining a connector having such excellent flatness is not particularly limited, but an economical injection molding method is preferably used.
• an economical injection molding method is preferably used.
• the temperature of the cylinder of the molding machine is preferably equal to or higher than the melting point T of the liquid crystalline polymer.
• Cylinder temperature is T ° C ⁇ (T + 30) due to problems such as nose dripping from the cylinder nozzle.
• C preferably T ⁇ (T + 15).
• the mold temperature is preferably from 70 to 100 ° C.
• the molding is preferably performed at 150 mm / sec or more. If the injection speed is low, only unfilled molded products can be obtained, or even if a completely filled molded product is obtained, the molding pressure will be high and the residual internal stress will be large, and only connectors with poor flatness will be obtained. May not be possible.
• Additives such as nucleating agent, pigment such as bonbon black, inorganic calcined pigment, antioxidant, stabilizer, plasticizer, lubricant, release agent and flame retardant to the composite resin composition.
• a composition to which desired properties are imparted by addition is also included in the range of the composite resin composition (C) referred to in the present invention.
• the obtained connector was left standing on a horizontal desk, and the height of the connector was measured with a Mitutoyo QuickVision 404PR0CNC image measuring machine. At that time, the position of 0.5 thigh was measured at 10 thigh intervals from one end of the connector, and the difference between the maximum height and the minimum height was defined as the flatness.
• test pieces of the liquid crystalline polymer composition containing glass fibers were prepared under the following conditions and evaluated. The results shown in Table 2 were obtained. [Manufacturing conditions]
• Nittobo PF70 fiber diameter ( ⁇ fiber length 8 ⁇ ⁇ milled fiber) • Lubricant; Unistar manufactured by NOF Corporation ⁇ -476
• Fig. 3 shows the outline of the screw of the extruder.
• Plasticization section 12; C4 to C5 Composition: from the upstream, forward kneading, reverse kneading, length 128 thighs
• Kneading part 14; C6 to C8 (Construction: from upstream, forward kneading, orthogonal kneading, reverse nipping, reverse flight, forward kneading, reverse kneading, reverse flight, length 352 thighs)
• Screw-in type loss-in-weight feeder manufactured by Nippon Steel Works Feeder to side feed opening;
• Cylinder temperature Only cylinder C1 at main feed port 11 was 200 ° C, and all other cylinder temperatures were 350 ° C.
• a pellet of liquid crystalline polymer was supplied from the main feed port 11 and the side feed port 13
• a lubricant was supplied from the main feed port 11
• a glass fiber was supplied from the side feed port 13.
• the side feed port was supplied using a biaxial side feeder, and the ratio of liquid crystalline polymer pellets, lubricant, and glass fiber was controlled using a weight feeder so as to be as shown in Table 1.
• Screw-The number of revolutions and the extrusion rate are set as shown in Table 1. After the molten resin composition discharged from the die 16 in the form of a strand is conveyed by a mesh belt conveyor manufactured by Yunaka Manufacturing Co., Ltd., and cooled by spray spray ⁇ Cutting was performed to obtain pellets. The test pieces were prepared from the pellets using an injection molding machine and evaluated. The results shown in Table 2 were obtained.
• Example 1 29.7 0.3 30 40 300 35 Example 2 9.7 0.3 50 40 300 35
• Example 3 14.7 0.3 45 40 300 35
• Example 4 14.7 0.3 40 45 300 25
• Example 5 14.7 0.3 35 50 300 25
• Comparative example 1 9.7 0.3 60
• Comparative Example 2 64.7 0.3 ⁇ 35 300 25
• Comparative Example 3 64.7 0.3 ⁇ 35 300 25
• Comparative Example 4 9.7 0.3 55 35 300
• Comparative Example 7 44.7 0.3 5 50 300 25
• Comparative example 8 39.7 0.3 5 55 300 25
• Example 1 40 320 40 0.073 0.009 16.2
• Example 2 40 190 36 0.059 0.003 15.6
• Example 3 40 226 31 0.048 0.002 15.6
• Example 4 45 264 37 0.083 0.009 18.5
• Example 5 50 255 39 0.083 0.007 20.0
• Comparative example 1 30 214 32 0.061 0.045 1.4.0
• Comparative Example 2 35 370 57 0.073 0.021 17.8
• Comparative Example 3 35 430 59 0.069 0.027 17.9
• Comparative Example 4 35 229 32 0.067 0.102 15.8
• Comparative Example 5 40 397 56 0.092 0.010 19.4
• Comparative Example 6 45 359 60 * * 20.5 Comparative Example 7 50 315 67 * * 20.9 Comparative Example 8 55 305 80 * * 22.0 Comparative Example

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Connector Housings Or Holding Contact Members (AREA)

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• 2004
  • 2004-03-26 JP JP2004092020A patent/JP4717366B2/ja not_active Expired - Lifetime
• 2005
  • 2005-03-15 TW TW94107779A patent/TWI343676B/zh not_active IP Right Cessation
  • 2005-03-24 CN CNB2005800094012A patent/CN100539317C/zh not_active Expired - Lifetime
  • 2005-03-24 WO PCT/JP2005/006220 patent/WO2005093909A1/ja active Application Filing

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