JP6506525B2 - Punch Carrier Tape Sheet - Google Patents

Description

  The present invention relates to a sheet for a punch carrier tape for storing and transporting electronic parts and the like.

  Conventionally, a carrier tape has been used as a method of storing and transporting a micro electronic component mounted on a circuit board. The carrier tape includes a punch carrier tape in which a series of cavities for housing electronic components are formed by punching holes of component shape on a carrier tape base material and laminating a bottom tape on the bottom surface, and vinyl chloride resin There is an embossed carrier tape or the like formed by embossing a sheet made of a thermoplastic resin such as a styrene resin, a polyethylene terephthalate resin, and a polycarbonate resin into a part shape. After these electronic components are stored in the cavity or the emboss portion, the carrier tape is heat-sealed on the top surface of the cover tape, wound into a reel, and conveyed.

  There are cases where a paper is used as a base material and a case where a plastic is used for a punch carrier tape (patent documents 1 and 2). Most of the paper is used, which has cost advantages and is widely used for thin electronic components such as 1 mm or less in thickness. However, in the case of a paper carrier tape, fiber debris of paper is generated on the end face of the slit-processed tape or the punched inner wall of the pocket, and it adheres to the stored parts or is stored due to beard-like fiber scraps. There is a problem that the components are inclined in the pocket, resulting in a decrease in the mounting rate at the time of mounting work.

  On the other hand, a punch carrier tape based on a foamed sheet of a plastic such as polypropylene as a base material has also been proposed (Patent Document 3), but these have low rigidity and a thin one such as 1 mm or less. In the case of peeling the cover tape, the micro electronic component may pop out, or take out failure upon taking out by the robot.

  Further, when using a plastic sheet, burrs and fluffs of the sheet are generated on the slit end face of the tape or the punched inner wall of the pocket, which is a problem as in the case of paper waste when using paper. In addition, when the antistatic treatment is not performed, the electronic components may stick to the side of the pocket due to the static electricity, or the electronic components may be broken due to the static electricity.

  As anti-static treatment, methods of blending conductive fillers such as carbon black with plastics (Patent Document 2), methods of adding antistatic agents such as surfactants, etc. to resins have been studied. However, when a conductive filler such as carbon black is used as a package, there is a problem that carbon black is detached due to friction with a packaged object such as an electronic component due to vibration such as transportation, and the electronic component is contaminated. There is. In addition, when an antistatic agent is added to polypropylene, it is necessary to add a large amount of the antistatic agent to obtain antistatic performance, the film forming property of the sheet is deteriorated, and the rigidity of the sheet is further reduced. There is a risk that the strength may be weakened.

JP 2005-179797 A JP, 2007-8502, A JP 2004-168335 A

  The present invention is a plastic sheet used as a base material of a punch carrier tape which is excellent in rigidity, has sufficient stiffness even with thin wall, expresses a sufficient antistatic effect, and is excellent in punching processability and slit processability. It is provided.

As a result of intensive studies, the present inventors have found that the above-mentioned problems can be achieved by blending a polyolefin-based resin, a filler, and a specific polymer type antistatic agent, resulting in the present invention. That is, the present invention comprises 40 to 75% by mass of a polyolefin resin, 15 to 50% by mass of a filler, and 10 to 30% by mass of a polymeric antistatic agent, and the polymeric antistatic agent is a polyolefin block and polyamide It is a sheet | seat for punch carrier tapes comprised with the block copolymer of the hydrophilic block at least 1 type of block selected from a system block, and a hydrophilic block. The polyolefin resin is preferably any one selected from polypropylene and polyethylene or a mixture thereof. The filler is preferably one or more selected from talc, mica, glass fiber, calcium carbonate and pulp. The surface resistance value is preferably 10 ⁸ Ω or more and less than 10 ¹² Ω.
The present invention also provides an electronic component packaging container using the punch carrier tape sheet according to the present invention.

  According to the present invention, a plastic sheet used as a base material of a punch carrier tape which is excellent in rigidity, has sufficient stiffness even with thin wall, expresses a sufficient antistatic effect, and is excellent in punching processability and slit processability can get.

It is a figure which shows the evaluation criteria of the extraction burr index of the sheet | seat for punch carrier tapes which concerns on the Example of this invention.

  The punch carrier tape sheet of the present invention is made of a resin composition containing 40 to 75% by mass of a polyolefin resin, 15 to 50% by mass of a filler, and 10 to 30% by mass of a polymeric antistatic agent.

  The polyolefin resin as referred to in the present invention is a homopolymer, copolymer of an aliphatic olefin compound such as polyethylene such as high density polyethylene, low density polyethylene, linear low density polyethylene, polypropylene, poly-1-butene and the like. is there. Examples of the copolymer include ethylene-propylene copolymer, ethylene-1-butene copolymer, ethylene-methylpentene copolymer and the like. The polypropylene includes a propylene homopolymer and a propylene copolymer containing 50 mol% or more of propylene units (the same applies to poly-1-butene). Among these, it is preferable that it is any selected from polypropylene and polyethylene or a mixture thereof.

  Content of polyolefin resin is 40-75 mass% with respect to the whole resin composition which forms the sheet | seat for punch carrier tapes of this invention, Preferably it is 50-60 mass%. When the amount is less than 40% by mass, the flexibility of the sheet can not be maintained and cracks occur. When the amount is more than 75% by mass, the waist strength is lowered, and punching processability and slit processability are deteriorated.

  Although various fillers can be used as the filler, it is preferable to use at least one selected from talc, mica, glass fibers, calcium carbonate and pulp. Moreover, content of a filler is 15-50 mass% with respect to the whole resin composition which forms the sheet | seat for punch carrier tapes of this invention, Preferably it is 20-40%. If the addition amount is less than 15% by mass, sufficient rigidity of the sheet can not be obtained, the stiffness of the sheet becomes weak, and the punching processability and the slitting processability also deteriorate. If it exceeds 50% by mass, the processability at the time of extruding the sheet tends to be impaired, and furthermore, the flexibility of the sheet can not be maintained, and the sheet tends to be brittle. The shape of the filler is not particularly limited, but one having an average particle diameter of 5 to 50 μm, preferably 8 to 30 μm can be used. If the average particle size is less than 5 μm, the dispersibility of the inorganic filler may be reduced at the time of extrusion of the sheet, and if it exceeds 50 μm, pinholes are likely to occur at the time of sheet formation.

  For example, a block copolymer of a polyolefin block and / or a polyamide block and a hydrophilic block, which has a number average molecular weight of 2000 or more, is used as the high molecular weight antistatic agent. JP-A-2001-278985 can be referred to, for example, for a polymeric antistatic agent composed of such a block copolymer.

Examples of the olefin-based monomer constituting the polyolefin block, for example, ethylene, propylene, can C _2-6 illustrate olefins such as 1-butene, in polyolefin block, the ratio of these olefinic monomers It is preferable that it is 80 mol% or more (especially 90 mol% or more). Among these olefin monomers, at least one selected from ethylene and propylene is preferable. In particular, propylene is preferable, and it is particularly preferable that 80% by mole or more (particularly 90% by mole or more) of the olefin-based monomers is used. The number average molecular weight of the polyolefin block is, for example, about 1000 to 50000, preferably about 3000 to 40000, and more preferably about 5000 to 30000, and the proportion of the polyolefin block in the block copolymer is, for example, 20 to 70%. %, Preferably about 25 to 50% by weight.

The polyamide block includes, for example, diamine (eg, C _4-20 aliphatic diamine such as hexamethylene diamine) and dicarboxylic acid (eg, C _4-20 aliphatic dicarboxylic acid such as adipic acid, sebacic acid, dodecanedioic acid, etc.) A block obtained by condensation with an amino carboxylic acid (eg, C _4-20 amino carboxylic acid such as 6-aminohexanoic acid, 12-aminododecanoic acid, etc.), a lactam (a caprolactam etc.) _{4-20, and the} like, or a block obtained by ring-opening polymerization, or a copolymer block obtained from these components. The number average molecular weight of the polyamide block is, for example, about 1000 to 50,000, preferably about 3,000 to 40,000, and more preferably about 5,000 to 30,000, and the proportion of the polyamide block in the block copolymer is, for example, 20 to 70 weight. %, Preferably about 25 to 50% by weight.

Examples of hydrophilic blocks include, but are not limited to, polyether polymers (or nonionic polymers), cationic polymers, anionic polymers and the like, preferably polyalkylene oxides (eg polyethylene oxide, polypropylene oxide, polyethylene oxide-polypropylene) Poly _C2-4 alkylene oxides such as oxides). The polymerization degree of the alkylene oxide is about 1 to 300 (eg, 5 to 200), preferably 10 to 150, and more preferably 10 to 100 (eg, 20 to 80).

  The polyolefin block and the hydrophilic block are bonded via an ester bond, an amide bond, an ether bond, a urethane bond, an imide bond or the like. These bonds can be formed, for example, by modifying a polyolefin with a modifier and then introducing a hydrophilic block. For example, after the polyolefin is modified with a modifier to introduce an active hydrogen atom, it is introduced by addition polymerization of a hydrophilic monomer such as an alkylene oxide. As such a modifier, for example, unsaturated carboxylic acid or its anhydride (such as (anhydride) maleic acid), lactam or amino carboxylic acid (such as caprolactam), oxygen or ozone, hydroxylamine (such as 2-aminoethanol) And diamines (such as ethylene diamine) or mixtures thereof. The polymer type antistatic agent thus obtained can be obtained, for example, from Sanyo Kasei Kogyo Co., Ltd. under the trade name "Pellestat 230" and "Pellestat 300".

  The polyamide block and the hydrophilic block are linked via an ester bond, an amide bond, an ether bond, a urethane bond, an imide bond and the like. These bonds can be formed, for example, by bonding a polyamide having a functional group at both ends and a polyether polymer with a glycidyl ether compound (eg, bisphenol A glycidyl ether etc.). The polymer type antistatic agent thus obtained can be obtained, for example, from BASF Japan Ltd. under the trade name “IRGASTAT P16”, “IRGASTAT P18”, from Sanyo Chemical Industries, Ltd. under the trade name “Pellestat NC6321”. Available as

  The content of the polymeric antistatic agent is 10 to 30% by mass, preferably 13 to 25% by mass, based on the entire resin composition forming the sheet for a punch carrier tape of the present invention. If it is less than 10% by mass, a sufficient antistatic effect can not be obtained. If it exceeds 30% by mass, there is a risk of poor film appearance such as poor appearance of the sheet and adhesion of the sheet to the cooling roll at the time of film formation, and the rigidity of the sheet may be further reduced to weaken the waist strength.

The surface resistance value of the sheet for a punch carrier tape of the present invention is preferably 10 ⁸ Ω or more and less than 10 ¹² Ω. When the surface resistance value is 10 ¹² Ω or more, the sheet is likely to be charged, and in some cases, the sheet can not be suitably used for packaging electronic components and the like susceptible to static electricity. Also, from the viewpoint of antistaticity, the surface resistance value is not too low to cause a problem, but it is not practical to obtain less than 10 ⁸ Ω by the addition of the antistatic agent.

  The sheet for a punch carrier tape of the present invention contains various stabilizers such as light stabilizers, ultraviolet absorbers and antioxidants, plasticizers, and lubricants insofar as physical properties, film forming properties, punching processability and slit processability are not impaired. Processing aids such as colorants may be added as required.

  The thickness of the punch carrier tape sheet of the present invention is not particularly limited, but a sheet of 0.1 to 1 mm is suitably used, and a sheet of 0.15 mm to 0.7 mm is more suitably used.

  The method for producing the punch carrier tape sheet of the present invention is not particularly limited. For example, after blending each component in a predetermined ratio and dry blending with a generally used tumbler or kneading with a twin-screw extruder or the like to obtain a pellet-like compound, A sheet for a punch carrier tape can be obtained using a known method such as extrusion molding or calendar molding. Alternatively, some of the components are kneaded with a twin-screw extruder or the like to obtain a pellet-like compound, and the pellet-like compound and the remaining components are mixed with a tumbler or the like before extrusion molding or calendaring. May be dry blended. In addition, when dry blending or when obtaining a pellet-like compound, the addition order of the respective components is not particularly limited.

  The sheet for a punch carrier tape obtained in this manner can be used as a base material of the punch carrier tape by performing slit processing and punching processing by a known method.

  The bottom tape to be attached to the bottom side of the base material of the punch carrier tape is not particularly limited. For example, a film in which a polyethylene resin layer and an EVA resin layer are laminated is used. By heat sealing on the bottom side of the substrate, a punch carrier tape having a series of cavities formed can be obtained.

  The punch carrier tape thus obtained has the electronic component housed in its cavity and is used as an electronic component packaging container. The punch carrier tape containing the electronic components is covered with a cover tape by heat sealing on the upper surface side and covered with the cover tape, and wound on a reel, and used for storage and transport of the electronic components as a carrier tape package.

  The sheet for a punch carrier tape of the present invention is excellent in rigidity and has sufficient stiffness even if it is thin, exhibits sufficient antistatic effect, and is excellent in punching processability and slit processability (the occurrence of burrs and fluffs is extremely high) For example, the punch carrier tape using the same can be suitably used as an electronic component package container for housing a thin micro electronic component of, for example, 1 mm or less.

  Hereinafter, the present invention will be described in detail by way of Examples and Comparative Examples, but the present invention is not limited thereto.

(Examples 1 to 9)
In the composition shown in Table 1, the polyolefin resin, the filler and the antistatic agent were melt-kneaded in a φ30 mm twin-screw extruder to be pelletized. Then, it melt-kneaded with the single-screw extruder of (phi) 65 mm, was sheeted by T-die, and obtained the sheet | seat by cooling and solidifying with the roll heat-regulated at 60 degreeC. The sheet thickness was 0.3 mm.

(Comparative Examples 1 to 7)
A sheet was obtained in the same manner as in Example 1 except that the composition shown in Table 2 was used. The sheet thickness was 0.3 mm.

  The antistatic agent used in each example and comparative example is a polymer type antistatic agent in which "Pelestat 230" manufactured by Sanyo Chemical Industries, Ltd. is composed of a polyolefin block and a hydrophilic block, "Pellestat 300 manufactured by Sanyo Chemical Industries, Ltd. Is a polymer type antistatic agent composed of a polyolefin block and a hydrophilic block, a polymer type antistatic agent composed of a polyamide based block and a hydrophilic block, "Pelestat NC6321" manufactured by Sanyo Chemical Industries, Ltd., manufactured by Nippon Emulsifier Antox EHD-PNA "is a phosphate ester type polymer type anionic surfactant (polyoxyalkylene alkyl ether phosphate ester), and Kao" Erestmaster 326 "is a low molecular type nonionic surfactant It is.

  The various evaluations were performed by the following method about the sheet | seat formed into a film by each Example and the comparative example.

(Tensile characteristics)
Evaluation was performed in accordance with JIS K7127.

(Surface resistance value)
Evaluation was performed in accordance with JIS K6911.

(Sheet film forming property)
When sheet formation was carried out at a cooling roll temperature of 80 ° C., those which tend to cause adhesion to the cooling roll were regarded as defective and those which did not occur were regarded as good.

(Sheet flexibility)
The mandrel test described in JIS K5600 was conducted to confirm the flexibility as a sheet. The sample was cut into pieces of 150 × 50 mm and bent along a mandrel. The sheet flexibility was evaluated by the diameter of the mandrel when a crack was generated when it was bent.
The sheet was wrapped around a φ8 mm mandrel and cracked. ○, the sheet was wrapped around a φ8 mm mandrel and cracked, and the sheet was evaluated for flexibility.

(Seat waist strength)
The sheet is sampled to 5 mm in width × 100 mm in length, and is looped in the length direction. Using a loop stiffness tester (manufactured by Toyo Seiki Co., Ltd.), the resistance when crushed was measured. The maximum load was shown when 15 mm was crushed at a pressing speed of 3.3 mm / sec.

(Excluded burr index)
The sheet was punched under the conditions of a clearance (a gap between the punching pin and the sheet support) of 20 μm and a punching speed of 250 mm / sec, and the surface punched under this condition was observed under a microscope at a magnification of 30 (microscope: MF- A manufactured by Mitutoyo. In the case where no fluff or burr was generated on the punching surface was 5, and the size of the fluff or burr and the degree of occurrence were evaluated in five steps according to the sample shown in FIG. If it is 4 or more, troubles such as contamination will not occur.

(Slit burr evaluation)
The slit condition of the sheet was a shear blade method (edge angle of upper blade 45 °, lower edge of blade 90 °), and an end face with 100 m slit at a slit speed of 50 m / min was extracted 3 m and observed with a microscope. It was considered that no fuzz and burrs were found and that there was fuzz with a length of less than 0.5 mm and burrs generated.

  Tables 3 and 4 collectively show the evaluation results of the respective examples and comparative examples.

Claims (3)

40 to 75% by mass of a polyolefin resin, 15 to 50% by mass of a filler, and 10 to 30% by mass of a polymeric antistatic agent, wherein the polymeric antistatic agent comprises a polyolefinic block and a polyamide block and at least one block is selected, it is composed of a block copolymer of a hydrophilic block, the polyolefin resin is polypropylene, and Ri either or mixtures der thereof selected from polyethylene, the filler A sheet for punch carrier tape which is at least one selected from talc and mica . The sheet for punch carrier tapes according to claim 1, wherein the surface resistance value is 10 ⁸ Ω or more and less than 10 ¹² Ω. An electronic component package comprising the sheet according to claim 1 or 2 .