TW201244931A - A heat-sealing film and a cover tape for packaging electronic components - Google Patents

Abstract

The invention provides a heat-sealing film for packaging an electronic element, comprising: a base layer; at least one intermediate layer which is provided on the base layer and comprises a mixture comprising, in terms of 100% by weight of the total weight of the intermediate layer, 5-70 % by weight of a vinyl acetate copolymer, wherein the units derived from vinyl acetate comprise more than 10% by mole of the copolymer, 20-90 % by weight of a styrene-butadiene copolymer, and 0-40 % by weight of a conductive polymer; and at least a heat-sealing layer which is provided on the surface of the intermediate layer opposite to the base layer. The invention further provides a cover tape made of the heat-sealing film as described above.

Description

201244931 VI. Description of the Invention: [Technical Field] The present invention relates to a heat seal film and a cover tape which is obtained from the heat seal film and which can be heat sealed to a storage pit in which a fan shape is distributed. On the carrier tape, the carrier tape has one of the following functions: protecting the electronic components from contamination when storing, transferring or mounting electronic components, and configuring and taking out the electronic components to be in the electronic circuit Assembly is performed on the substrate. [Prior Art] Recently, surface mount electronic components (such as ICs, transistors, diodes, capacitors, piezoelectric element resistors, and the like) are packaged into a plastic carrier tape in which embossed molding pits are sequentially formed, The electronic component can be received in the embossed dimples and conform to its shape and heat sealed to the package of the carrier tape and then supplied. After the cover tape is peeled off, the packaged electronic components are automatically taken out from the package and then surface mounted on the electronic circuit substrate. The strength of the self-loading tape peeling cover tape is referred to as "peel strength", and when the strength is too low, there is a problem that the cover tape is detached and the electronic component package is detached during conveyance packaging. On the other hand, when the strength is too high, the following phenomenon will occur: the carrier tape vibrates when the cover tape is peeled off and the electronic component jumps out of the storage pit before it is about to be installed, that is, causes a jitter failure. In addition, it is necessary to maintain the peel strength of a certain cover tape within a predetermined range. If the change in peel strength is too large, it is difficult to stably peel the cover tape by using a mounting machine. Antistatic properties are another key property. This is due to the fact that static electricity can damage electronic sheets 160811.doc 201244931 2 and can cause certain difficulties in the process. The transparency of the cover tape is also better than that, because the condition of the electronic components needs to be checked through the cover tape. In addition, the 'covering tape should not contaminate the electronic components. The mechanism for covering the self-supporting tape stripping on the market is divided into the following three. Class: interface peeling type, transfer peeling type and cohesive failure type. The type of private covering tape and the carrier tape are peeled off from each other on the sealing surface, and the transfer peeling type means that the bonding layer itself is transferred to the carrier tape during peeling. Type, and cohesive failure type refers to a type in which a layer different from the bonding layer or the bonding layer itself (both of which are hereinafter referred to as cohesive failure layers) is broken to cause peeling. Each of the types is There are advantages and disadvantages; however, when comparing only the state when peeling the seal to the cover tape of the carrier tape, the type of interface peeling is often affected by the shape, material and properties of the carrier tape, because the sealing surface and the peeling surface are the same. And thus the peel strength tends to become unstable. In the case of transfer peeling type, the bonding layer must be a film in terms of mechanism and must be used The heat-sealing paint is sprayed. Therefore, the peel strength tends to be affected by the enamel sealing temperature, and thus it is difficult to obtain a sealing condition for a suitable peel strength. In the case of a cohesive failure type, the sealing surface and the peeling layer are different. And thus the peel strength is less dependent on the sealing conditions. Similarly, the cohesive failure type has the significant advantage that the peel strength is not affected by the shape, material and properties of the carrier tape. However, in some cases, during peeling, The cohesive failure layer is affected by the layer other than the cohesive failure layer (including the bonding layer) and the interface is peeled off without causing cohesive failure. 160811.doc 201244931 Similarly, it is difficult to determine the location of the collapse of the cohesive failure layer. And thus the cohesive failure layer remains on the surface of the carrier tape during peeling and produces a state in which the contents cannot be taken out. The cohesive failure layer itself is designed to be easily broken, and thus in many cases, it is composed of a plurality of resins. a mixture of which is difficult to be miscible with each other and the resins are not uniformly mixed. This reduces the transparency of the cover tape and in some cases The binder has certain disadvantages. Also, in such applications, in some cases, the resin mixture contains a resin having poor heat resistance. For these reasons, in many cases, during the formation of the cohesive failure layer Producing a binder or degradation product and reducing productivity. Therefore, it is required to develop a transparent cover tape having stable peel strength, excellent antistatic properties, and no contamination of electronic components. SUMMARY OF THE INVENTION The object of the present invention is to develop a heat seal film, which The heat seal film can be cut into a cover tape, has stable peel strength, good antistatic property, does not pollute electronic components and has a transparent appearance. Another object of the present invention is to provide cohesive failure or transfer peeling by heat sealing. A cover tape is provided. According to the present invention, there is provided a heat seal film for encapsulating electronic components, comprising: a base layer; at least one intermediate layer provided on the base layer and comprising a mixture, the mixture having a weight of 100 Å. The total weight of the intermediate layer comprises: 5-70% by weight of a vinyl acetate copolymer, wherein the unit derived from vinyl acetate comprises 1 mole of the copolymer. /. Above; 160811.doc 201244931 20-90% by weight of styrene-butadiene copolymer; and 〇_4〇 by weight. /. The conductive polymer; and at least one heat seal layer ' is provided on the surface of the intermediate layer opposite to the base layer. The present invention further provides a cover tape for heat sealing to a carrier tape comprising electronic components, the cover tape comprising: a base layer; an intermediate layer 'which is disposed on the base layer; and a heat seal layer disposed on the intermediate layer' The cover tape has an average optical transmittance of at least 75%, an optical haze of no more than about 50%, and a surface resistivity of no more than about; such that when the cover tape is heat sealed to the carrier tape to form an article, the cover tape and the carrier tape The average peel strength is at least 2 〇, and the peel strength decreases by no more than about 丨〇0/〇 when the article experiences a temperature of not less than about 5 (the temperature of rc and a relative humidity of not less than about 9%) for at least 5 days. The antistatic heat seal film has excellent static dissipative properties, good optical properties, good mechanical properties, and excellent heat sealing properties to the surface of polycarbonate, polystyrene, polypropylene or the like. The heat-sensitive cover tape made by the sealing film has many advantages, for example, both sides. Long-lasting antistatic property, high light transmittance, low haze, stable peeling force with carrier tape, and excellent sealing aging performance. heat In the case of a sensitive cover tape, the adhesive surface after aging at high temperature and high humidity does not easily adhere to the surface of the carrier tape, and it is impossible to produce a tape opening after using the tape-sealing heat-sensitive cover tape. After sealing the cover tape made from #封膜, the adhesive layer remains on the support belt after peeling off, and the adhesive layer can be separated from the cover tape on the market with 160811.doc 201244931 Wherein the adhesive layer and the carrier layer knife are separated from each other by the production process, which greatly controls the surface of the functional layer and the adhesive layer, thereby ensuring excellent coverage of the cover tape product produced by the method. Controlling the peeling effect "In addition, the surface roughness of the carrier tape is relatively high, and if the adhesive layer is separated from the carrier layer after peeling, the stability of the peeling force is poor. [Embodiment] In the present invention, unless otherwise specified, Otherwise, the term "heat-sensitive adhesive" means a heat-sealable polymer resin. The term "addition-type cationic antistatic coating" means a coating having antistatic properties obtained by adding a cationic antistatic agent to a coating. The present invention provides a heat seal film for packaging electronic components, comprising: a base layer; at least one intermediate layer 'provided on the base layer and comprising a mixture comprising, in terms of 100% by weight of the total weight of the intermediate layer: 5 - 70% by weight of a vinyl acetate copolymer, wherein units derived from vinyl acetate account for more than 1% by mole of the copolymer; 20 to 90% by weight of styrene-butadiene copolymer; and 0-40 a % by weight of a conductive polymer; and at least one heat seal layer provided on a surface of the intermediate layer opposite to the base layer. The base layer is mainly used to provide mechanical strength of the film. In the present invention, it is not specific to the base layer. A substrate layer that is limited and commonly used to create a heat seal film can be used in the present invention. Preferably, the base layer is selected from the group consisting of biaxially stretched polyester, polyolefin 160811.doc 201244931 smoke or nylon. Preferably, the base layer has a thickness of about 10 Torr to 30 μm. The film preferably has an optical transmittance of not less than 85% and a tensile strength of not less than 50 MPa. The intermediate layer used in the heat seal film of the present invention is relatively soft and electrically conductive, and may be composed of one layer or a plurality of layers. Polyethylene which is suitable for the intermediate layer is preferably a linear low-density polyethylene (LLDPE), more preferably having a weight average molecular weight of more than 1 〇〇, and a melt index (test condition is 19 〇. (:, 2.16 kg 'ASTM D1238) is a 1-100 g/10 minute direct bond low density polyethylene. Suitable for polyethylene (for example) LLDPE (1002-YB) from Exxon Mobil. Polyethylene content in the middle layer It is 〇6〇wt%, preferably 10-60%, more preferably 20-60% and most preferably 50-60%. In the intermediate layer, a suitable vinyl acetate copolymer is a unit derived from vinyl acetate. The percentage of moles is at least 丨〇%, preferably higher than 丨5%, and most preferably still 20%. The suitable comonomer is preferably selected from the group consisting of olefins, more preferably from ethylene. Suitable for the melt index of vinyl acetate copolymer (test conditions are 190. (:, 2.16 kg, eight 8 butyl) ^ 〇 1238) 4 cross is preferably 1-250 g / l 〇 minutes, more preferably 1-100 g / Η) minutes, and optimally 2_5〇§/1〇. The content of the vinyl acetate copolymer in the intermediate layer is 5-7 wt%, preferably 5-50%, more preferably 10-60%, Better 10 4〇%, further preferably 20-40% and most preferably 20-30%. The styrene-butadiene copolymer suitable for the intermediate layer is preferably a styrene-derived unit which accounts for 50% of the total copolymer unit. More than or equal to the ear, more preferably more than 6% by mole and most preferably 70 moles of the above block copolymer. Preferably, the weight average molecular weight of the suitable styrene-butadiene copolymer is preferred. It is 2〇〇〇〇 to 160811.doc 201244931, and optimally 50,000 to styrene·butadiene copolymer 500000, more preferably 40,000 to 300,000 150,000, and the molecular weight distribution is preferably ι_2. 20-90%, preferably 3〇_7〇%, the intermediate layer preferably has a thickness of (four) micrometers and its surface can be electrically conductive by adding a conductive polymer as needed. For example, t' surface resistivity can be less than IxH 11 ohms / □, more preferably less than lxl 〇 1 〇 ohms / port, and optimally less than lxlO9 ohm / □. Suitable electrically conductive polymers include, but are not limited to, polyacetylene, polypyrrole, polythiophene, polyaniline, polyether decylamine or polyester guanamine based intrinsic antistatic polymer or the like, or combinations thereof. In the case where a separate polyethylene layer is not provided, an adhesive layer may be provided between the intermediate layer and the base layer as needed. In the case where a separate polyethylene layer is provided, an adhesive layer is provided between the polyethylene layer and the substrate layer as needed. The adhesive layer can be a conventional curable polyamine phthalate type adhesive.

According to some embodiments, the intermediate layer is formed primarily by blending an ethylene-vinyl acetate copolymer, a styrene-butadiene block copolymer, and an amount of an intrinsically conductive or antistatic polymer using an extruder. Polymer alloy. The surface resistivity of the layer is preferably 1 X 1 〇 6 - 1 X 1 〇 14 ohms/□. The ethylene copolymer used in the intermediate layer may be poly(ethyl acetate). Poly(ethylene acetate) has a higher than 10%. /. The VA bond segment content is from 10 to 60 Wt% of the polymer alloy in the entire functional layer. The styrene-butadiene copolymer to be used has a polystyrene chain segment content of more than 50%. The block copolymer has a weight average molecular weight of from 2 5000 to 500,000 and a molecular weight distribution of from 1 to 2. The copolymer is 30-90 wt% of the polymer alloy in the entire functional layer. The intrinsically conductive or antistatic polymer to be used may be ICP (Inner Conductive Polymer) or IDP 160811, d〇c •10· 201244931 ( Intrinsically dissipative polymer) 'comprising polyacetylene, polypyrrole, polythiophene, polyaniline, polyether decylamine or polyester guanamine based intrinsic antistatic polymer or the like, or a combination thereof, which occupies the entire functional layer 0-40 wt% of the polymer alloy. A heat seal layer (also referred to as "thermosensitive adhesive layer" in the present invention) is provided on the surface of the intermediate layer 10 opposite to the base layer. The heat seal layer may be composed of a material in one layer or a plurality of layers and may be electrically or non-conductive as needed. Preferably, the heat seal layer is composed of a material selected from the group consisting of polyacrylates or copolymers thereof and the glass transition temperature of the polymer should be higher than 3 (rc 'more preferably higher than 60 C, and most preferably 70-90 °C. If necessary, if a conductive or antistatic polymer is not added to the intermediate layer, a certain amount of conductive particles may be added to the heat seal layer. For example, the heat seal layer may be added with a certain amount. a coating of a polyacrylate or a copolymer thereof of the conductive filler. The heat seal layer may have a thickness of 〇1_10 μm and lxl〇7-l>l〇i2 ohm/□, more preferably lxl〇 7lx1〇11 ohm/□ surface resistivity>>The conductive filler may be a nano oxide, for example, titanium dioxide, cerium oxide, aluminum oxide, zinc oxide, tin oxide, antimony oxide, indium tin oxide or the like. Conductive filler It may also be a carbon nanotube, a carbon powder, a metal powder or the like. The conductive filler particles added in the layer preferably constitute 〇6〇wt<)/ of the entire heat-sensitive adhesive layer. More preferably 0-30 wt%. The polyacrylate or copolymer thereof to be used in the heat seal layer has a preferred glass transition temperature of TC of 30 and a preferred heat activation temperature of 9 ° C or higher. Antistatic coating can be applied as needed. The layer is applied to the surface of the substrate layer. The dry film thickness of the antistatic coating may be, for example, 0.01-2 microns, preferably 〇〇51 160811.doc 201244931 microns and optimally 0.1-0.8 microns. Antistatic The surface resistivity of the coating may be from lxlO6 to lxlO12 ohms/□, more preferably from 丨... to ^(7) 丨丨 ohms/mouth. The antistatic coating on the substrate layer can be achieved by a gravure coating process. When the ambient humidity is 50 ° / ◦, the surface resistivity of the antistatic coating is not higher than 1 x 1012 ohm / port. This coating may be an additive cationic antistatic coating or a polymer grafted cationic anti-corrosion. An electrostatic coating, and which may also be a polymer coating having a relatively good temperature resistance to which a conductive filler is added. The conductive filler may be selected from metal oxides, nanotubes or other conductive particles. A cross-sectional view of a cover tape according to an embodiment of the present invention has a thickness of about 10-30. The base layer of rice is mainly used to provide mechanical strength of the film. The surface of the base layer 2 is coated with an antistatic coating having a dry film thickness of 〇〇1_2 μm and a surface resistivity of lxlO6 to lxlO12 ohm/□. The functional layer 3 of the conductive surface (in the present invention, the functional layer means the intermediate layer) is used to cast the surface of the base layer 2 opposite to the antistatic coating i. The functional layer 3 has a thickness of 1 〇 5 μm and ΙχΙΟ 5 to The surface resistivity of lxl〇i〇 ohm/□. The surface of the functional layer 3 opposite to the base layer 2 is subjected to a heat-sensitive adhesive layer 4 having a thickness of 〇〇1_1 〇micrometer and a surface resistivity of 1×105 to 1×10i2 ohm/port ( In the present invention, the heat-sensitive adhesive layer is equivalent to the heat seal layer. In the structure of FIG. 1, the base layer 2 may be selected from biaxially stretched polyester, polyolefin or nylon to have a certain mechanical strength. The plastic film has an optical transmittance of not less than 85% and a tensile strength of not less than 5 〇 Mpa. The antistatic coating 1 on the substrate layer is realized by a gravure coating process at an ambient humidity of 5 When 〇%, the surface resistivity of the surface is not higher than lxlO12 /□ The coating may be an additive cationic antistatic coating or a polymer grafted cation 160811.doc • 12-201244931 antistatic coating” and it may also have a relative addition of a conductive filler. A polymer coating with good temperature resistance. The conductive filler may be selected from metal oxides, carbon nanotubes or other conductive particles. The functional layer 3 is mainly obtained by blending an ethylene copolymer, styrene by using an extruder. A polymer alloy of a butadiene block copolymer and a certain amount of an intrinsically conductive or antistatic polymer. The surface resistivity of this layer is lxl 〇 6_lxl 〇 14 ohms/mouth. The heat-sensitive adhesive layer 4 is mainly a coating of a polyacrylate or a copolymer thereof to which a certain amount of conductive particles is added, and has a thickness of 0_01_10 μm and a surface resistivity of 1 χ 1 〇 6 χ 1 〇Ι 2 Ω / α. The ethylene type copolymer used in the functional layer 3 may be poly(vinyl acetate). The poly(vinyl acetate) has a VA segment content higher than 丨〇% and accounts for 1〇_6〇 wt% of the polymer alloy in the entire functional layer 3. The styrene-butadiene copolymer to be used has a higher than 50. /. The content of the polystyrene chain segment. The block copolymer has a weight average molecular weight of 20,000 to 500,000 and a molecular weight distribution of 12 "this copolymer accounts for 3 〇 _ 90 wt / 〇 of the polymer alloy in the entire functional layer. The intrinsically conductive or antistatic polymer to be used may be or IDP, comprising polyacetylene, polypyrrole, polythiophene, polyaniline, polyether decylamine or polyester guanamine based intrinsic antistatic polymer or the like or combinations thereof It accounts for 〇4〇wt% of the polymer alloy in the entire functional layer. The polyacrylate or copolymer thereof to be used in the heat-sensitive adhesive layer 4 has a glass transition temperature of 30 to 90 ° C and a heat activation temperature of 90 or higher. The conductive filler particles added in the layer accounted for 〇6〇 wt% of the entire adhesive layer. The conductive filler may be a nano oxide, for example, titanium dioxide, sulphur dioxide, oxidized, oxidized, tin oxide, oxidized, indium tin oxide or 16081I.doc 201244931, etc. The conductive filler may also be nano carbon. Tube, carbon powder, metal powder or the like. Figure 2 is a cross-sectional view of another cover tape of the present invention. The surface of the base layer 2 is coated with an antistatic coating 1. The surface of the base layer 2 opposite to the antistatic coating is coated with the functional layer 3 via the adhesive layer 5. The surface of the functional layer 3 opposite to the adhesive layer 5 is coated with the heat-sensitive adhesive layer 4. Figure 3 is a cross-sectional view of another cover tape of the present invention. The surface of the base layer 2 is coated with an antistatic coating 1. The polyethylene layer 6 and the functional layer 3 (the polyethylene layer 6 constitutes a part of the functional layer 3) are formed by co-extrusion blow molding. The surface of the polyethylene layer 6 is combined with the base layer 2 via the adhesive layer 5. The surface of the functional layer 3 opposite to the polyethylene layer 6 is coated with the heat-sensitive adhesive layer 4. The present invention further provides a cover tape heat-sealed to a carrier tape comprising an electronic component, the cover tape comprising: a base layer; an intermediate layer disposed on the base layer; and a heat seal layer disposed on the intermediate layer, the cover tape Having an average optical transmittance of at least 75%, an optical haze of no more than about 5%, and a surface resistivity of no more than about 1 x 1 〇 u 2; so that when the cover tape is heat sealed to the carrier tape to form an article, the cover tape is The average peel strength of the carrier tape is at least 20 gf/mm, and the peel strength is reduced by no more than about 1% by weight when the article is subjected to a temperature of not less than about 5 〇C and a relative humidity of not less than about 90% for at least 5 days. The heat-sensitive cover tape of the present invention has many advantages such as permanent antistatic properties on both sides, high light transmittance, low haze, stable peeling force with a carrier tape, and excellent sealing aging properties. In the case of using a heat-sensitive cover tape, I60811.doc 14 201244931 The adhesive surface after aging under high temperature and high humidity does not easily adhere to the surface of the carrier tape, and it is impossible to produce a belt opening after using the tape-sealed heat-sensitive cover tape. The problem. After the cover tape obtained by the carrier tape sealing self-heat sealing film is used, the dot layer remains on the support tape after peeling off, and the adhesive layer can be separated from the functional layer. Compared with the case of the cover tape on the market (where the adhesive layer is separated from the carrier layer, which is controlled by the control generation process to well control the surface of the functional layer and the adhesive formulation), it can be ensured by the method. The stable stripping effect of the cover tape product is relatively high, and the surface roughness of the carrier tape is relatively high and the different carrier tapes have different surface thick chains. If the adhesive layer is peeled off and separated from the carrier layer, the stability of the peeling force is poor. The invention is explained in more detail below by way of examples. It should be noted that the examples are in no way intended to limit the invention and the scope of the invention is defined by the scope of the appended claims. In the present invention, unless otherwise specified, all parts, percentages, enthalpy, ratios are by weight, all temperatures are in Celsius and all values having unspecified units are most commonly used in the technical field. The early position. Example test method: Surface resistivity: Perform test according to ESD S 11.11 standard test method under certain temperature and humidity conditions: After placing the resistivity meter on the surface of the object to be measured, adjust the switch to the desired voltage position. (1G V or (10)V) and use a pressure of about 5 ounces to continue pressing the button and then 'LCD Curtain will display the measured surface resistivity. The unit of surface resistivity is ohm/port. 160811.doc 201244931 Optical transmittance and haze. It is measured by haze meter HM-15 0 to measure the peeling force at β 180°: seal the 5 4 mm wide cover at 16 (TC) by heat sealing machine Belt and 8 mm wide carrier tape. Then, the peeling force tester ρΤ_ 45 is used to measure 18 〇. The peeling force under. The peeling force aging test at 180°: by heat sealing machine at i 60 °c To seal the 5 · 4 mm wide cover tape and the 8 mm wide carrier tape. Then, measure the peel force by 180 by the peel force tester PT-45; place the sample at 52 C / 95rh ° / 〇 In the aging room, after aging for 5 days, the sample was taken out and subjected to the peeling force test. The aging test at 60 ° C for adhesion resistance: the sample to be tested was adhered to the surface of the polycarbonate sheet by Adhesive tape is used to fix both sides. The obtained sample is placed in an aging tank at 60 ° C. After a certain period of time, the sample is taken out and observed whether adhesion occurs on the surface of the heat seal film and the polycarbonate sheet. Example 1: Preparation of functional layer material: 67.5 kg styrene-butadiene block copolymer (CHI MEI, PB_ 5903) ' 3 7.5 kg poly(vinyl acetate) HyunDai, VA60), 45 kg of intrinsic antistatic polymer (IDP: P〇lyNova PNC300R-M) and 0.6 kg of antioxidant A5 (Jinhai Albemarle, Shanghai Jinhai Albemarle Fine Chemicals Co., Ltd.) were uniformly stirred and melted at 180 °c Mixing, and then cooling and granulating for further application. Preparation of heat seal film and cover tape: 1. Preparation of 16 μηι thick single-sided corona discharge treated biaxially stretched polyester film β using a thickness of about 0.2 The polyimide coating of the μΐΏ is coated with electric wave 160811.doc 201244931 The surface of the military discharge treatment is 'and then baked in the box. Meanwhile, the polymer alloy prepared for the functional layer is melt coated Covering the undercoat coated polyester film and then cooling the obtained product and winding it. The functional layer has a thickness of 30 μm τι and a surface resistivity of lxl 〇9 ohm/□. 2_ under stirring 2 kg of polyacrylate copolymer (DSM, glass transition temperature of 42 ° C) powder was dissolved in 16 kg of ethyl acetate solvent, and then 2 kg of toluene was added and further stirred for 5 minutes for further application. Acrylic tree The solid content in the solution is 1% by weight. The solution is applied to the surface of the functional layer and the obtained product is dried in an oven to remove the solvent and wind it. The acrylic resin layer is a heat sensitive adhesive layer having Thickness of about ^ μπι The surface of the heat-sensitive adhesive layer has a surface resistivity of 1 <1〇1() ohm/mouth. The elbow is heavily plated with w * « i \JH Z ,

Qingdao Trade Import and Exp〇rt Co., Ltd.) is applied to the PET surface of the heat seal film opposite to the functional layer and baked on the supply box for curing. Under normal temperature and normal humidity, the antistatic coating has a dry film thickness and a surface resistivity of 1χ1〇π ohm/〇. ^ For the obtained heat-sealing film, the optical transmittance is (4), and the haze value is 10%'. The surface resistivity on the surface of the heat-sensitive adhesive is Μ. 】. Ohmic / □, and the surface resistivity on other surfaces is ... (9) ohm / carrier tape sealed at 1 70 C from the heat-sealing film, the peeling force is 5 〇 8 and the peeling force fluctuation range is About 2〇g. When the cover tape and the carrier tape are peeled off, the heat seal layer at the sealing position is completely retained on the carrier tape, and a small amount of the functional layer also resides on the carrier tape, so the peeling is within the functional layer 160811.doc -17- 201244931 The aggregate is broken and is substantially stripped. After the aging for one week at 52 ° C / 95 rh ° / 〇, the average value of the peeling force and the fluctuation range of the peeling force were substantially unchanged. Example 2: Preparation of functional layer material: 67.5 kg styrene-butadiene block copolymer MEI, PB-5903), 37.5 kg poly(vinyl acetate) (HyunDai, VA60), 45 kg essential antistatic Polymer (IDP: P〇lyNova PNC300R-M) and 0.6 kg of antioxidant A5 (Jinhai Albemarle, Shanghai Jinhai Albemarle Fine

Chemicals Co., Ltd.) Stir well and at 180. The underarm is melt mixed and then cooled and granulated for further application. Preparation of heat seal film and cover tape: 1 · Prepare a 6 μ μη thick single-sided corona discharge treated biaxially stretched polyester film. The corona discharge treated surface was coated with a polyamine phthalate type undercoat layer having a thickness of about 0.2 μm and then baked in an oven. At the same time, the polymer alloy obtained by the functional layer is melt-coated on the undercoated polyester film' and then the obtained product is cooled and wound. The functional layer has a thickness of 30 μm and a surface resistivity of lxl 〇 9 ohm/□. 2. Dissolve 2 kg of polyacrylate copolymer (3 Μ, glass transition temperature of 80 ° C) powder in 16 kg of ethyl acetate in a mixture, and then add 2 kg of toluene and further stir 5 Minutes for further application. The solid content of the acrylic resin in the solution was 10 ° /. . The solution was applied to the surface having the functional layer and the obtained product was dried in an oven to remove the solvent and wound up. The acrylic resin layer is a heat-sensitive adhesive layer having a thickness of about i μm. 160811.doc -18· 201244931 The surface of the heat-sensitive adhesive layer has lxl0,. Ohmic / port surface resistivity. 3. Antistatic coating solution with si content of 5%

Qingdao Trade Import and E P〇rt Co., Ltd.) was coated on a PET surface opposite to the functional layer in a hot film, on a H M M u '1 coat, and baked on an oven for curing. Under normal temperature and normal humidity, the antistatic coating has a dry film thickness of 0 '24 〇 1 and a surface resistivity of 1 > 1 〇 1 ohm / mouth. The obtained heat-sealing film had an optical transmittance of 85%, a haze value of ·, and a surface resistivity of 热敏ι on the surface of the heat-sensitive adhesive. Omm/mouth, and the surface resistivity on other surfaces is 1x10" Ohm/□. Use the carrier tape at 170. . The cover tape obtained by the heat sealing of the lower seal was sealed, and the average peeling force was 50 g and the peeling force fluctuated within a range of about 2 〇 g. When the cover tape and the carrier tape are peeled off, the heat seal layer at the sealing position is completely retained on the carrier tape, and a small amount of the functional layer also resides on the carrier tape, so that the cohesive force of the semantic functional layer is broken and substantially peeled off. The average value of the peeling force and the fluctuation range of the peeling force after the aging for one week under the conditions of hunger/95 (4) were substantially unchanged. Example 3: Preparation of functional layer material · 80 kg of styrene-butadiene block copolymer MEI, pB_ 03) 20 kg of poly(vinyl acetate) (HyunDai, VA6〇), and 〇*^^>Fb#]A5 (Jinhai Albemarle > Shanghai Jinhai Albemarle Fine Chemicals Co., Ltd.) was stirred evenly and at 18 〇. [Under melt mixing, and then cooled and granulated for further use. Preparation of heat seal and cover tape: i608I1.doc -19- 201244931 1. The material obtained by the functional layer is formed into a film by blow molding and wound for further application. Film thickness & 35μηιβ

2. Prepare a 12 μιη thick single-sided corona discharge treated biaxially stretched polyester film. The surface of the corona discharge treatment was coated with a polyamine-based acid ester gel (35%, an adhesive available from MITSUI TAKEDA CHEMICAL Co., Ltd., 969·969ν/Α 5 was 3/ι). The thickness of the glue after the material was about 2 μm; <> The resulting functional layer film was combined with the surface of the gel-coated polyester film and then cured at room temperature. 3. Dissolve 2 kg of polyacrylate copolymer (DSM) powder in 16 kg of ethyl acetate solvent with stirring, and then add lkgl5% carbon black conductive solution (PC AUTO carbon black, Nipp〇n Paint Co., Ltd. China) And 2 toluene, and further stirred for 5 minutes for further application. In the solution, the acrylic resin has a solid content of 9 '5. /〇 The ratio of conductive carbon black to acrylic resin is 1Π3.3. The solution was applied to the surface of the polyester film combined with the functional layer and the obtained product was dried in an oven to remove the solvent and wound up. The acrylic resin layer is a heat-sensitive adhesive layer having a thickness of about 〇5. The surface of the heat-sensitive adhesive layer has a surface resistivity of lxl 〇 9 ohms/□. 4. Apply an antistatic coating solution (Kl〇4A 2, Qingdao Trade Import and Export Co., Ltd.) with a solid content of 5% on the PET surface of the heat seal film opposite to the functional layer, and bake on the oven. For curing. The antistatic coating has a dry film thickness of 0.2»1〇1 and a surface resistivity of 1<1〇11 ohm/mouth under normal temperature and normal humidity. For the obtained heat seal film, the optical transmittance is 75%, the haze value is 10%, and the surface resistivity on the surface of the heat-sensitive adhesive is 1χ1〇9 ohm/〇, 160811.doc •20· 201244931 And the surface resistivity on other surfaces is 1 M0'·ohm/port. The cover tape obtained by cutting the heat-sealing film was cut using a carrier tape at C, and the average peeling force was 50 g and the peeling force fluctuated within a range of about 2 〇 g. When the cover tape and the carrier tape are separated, the heat seal layer at the sealing position is completely retained on the carrier tape' and no functional layer remains on the carrier tape, and thus the peeling is actually between the heat seal layer and the functional layer. The interface is peeled off. Example 4: Preparation of functional layer material: 6 〇kg styrene-butadiene block copolymer ((:出出^^1, 卩6_ 5903) ' 40 kg poly(vinyl acetate) (HyunDai, VA6〇) And 〇4 antioxidant A5 (Jinhai Albemarle, Shanghai Jinhai Albemarle

Fine Chemicals Co., Ltd.) was uniformly stirred and melt-mixed under 18 ° 1 > c and then cooled and granulated for further use. Preparation of heat-sealing tape and cover tape: ^ Co-extruding the material obtained from the functional layer and the direct-bond low-density polyethylene Lldpe (l〇〇2_YB, Exxon Mobil) and forming a film by a specific method and then winding For further application. The film had a total thickness of 35 μηη, wherein the thickness of the functional layer was 12 μηι and the thickness of the polyethylene layer was 23 μηι. 2. Prepare a 12 μηι thick single-sided corona discharge treated biaxially stretched polyfilm. The surface of the corona discharge treatment was coated with a polyamine phthalic acid styrofoam (35%, an adhesive from MITSUI TAKEDACHEMICAL, A-969V/A-5 was 3/1). The thickness of the glue after baking was about 2 μηΐβ. The polyethylene surface of the two-layer film was combined with the surface of the gel-coated polyester film and then cured at room temperature. 160811.doc 21 201244931 3. Dissolve 2 kg of polyacrylate copolymer (DSM) powder in 16 kg of ethyl acetate solvent with stirring> and then add 2 kg of 2〇0/〇AT〇 solution (nano oxidation) Tin/yttrium oxide solution) and! Kg was added to the benzene and further stirred at high speed for 5 minutes for further application. In the solution, the acrylic resin had a solid content of 9.5% and a ratio of cerium to acrylic resin of 1/5. The solution was applied to the surface of the polyester film combined with the functional layer and the obtained product was dried in an oven to remove the solvent and wound. The acrylic resin layer is a heat-sensitive adhesive layer having a thickness of about 0.5 μm. The surface of the heat-sensitive adhesive layer has a surface resistivity of lxio9 ohm/□. 4. Antistatic coating solution (Ki〇4a_2, with a solid content of 5%,

Qingdao Trade Import and Export Co., Ltd.) is applied to the PET surface of the heat seal film opposite to the functional layer and baked on an oven for curing. Under normal temperature and normal humidity, the antistatic coating has a dry film thickness of 〇 2 μm and a surface resistivity of <1 〇 " ohms/〇. For the obtained heat-sealing film, the optical transmittance is 85% 'the haze value is 15%' The surface resistivity on the surface of the heat-sensitive adhesive is 〇1〇9 ohmized, and the surface on other surfaces The resistivity is 1χ1〇11 ohms/port. The carrier tape was sealed under air by cutting the cover tape obtained from the heat-sealing film, and the average peeling force was 40 g and the peeling force fluctuated within about a layer. When the cover tape and the carrier tape are peeled off, the heat seal layer at the position of the seal is completely retained on the carrier tape and no functional layer remains on the carrier tape, and thus the heat seal layer is actually peeled off. The interface between the interface and the functional layer is peeled off. Comparative Example 1: Preparation of functional layer material: 160811.doc •22· 201244931 30 kg of styrene-butadiene block copolymer (CHI mEI, PB_ 5903), 75 kg of poly(ethylene acetate) (HyunDai, VA60), 45 kg of essential antistatic polymer (IDP: P〇lyNova PNC300R-M) and 0.6 kg of antioxidant A5 (Jinhai Albemarle, Shanghai Jinhai Albemarle Fine

Chemicals Co., Ltd.) Stir well and at 18 〇. The underarm is melt mixed and then cooled and granulated for further application. Preparation of heat seal film and cover tape: L A 16 μιη thick single-sided corona discharge treated biaxially stretched polyester film was prepared. The surface of the corona discharge treatment was coated with a polyurethane-based undercoat layer having a thickness of about 0.2 μm, and then baked in an oven. At the same time, the polymer alloy obtained by the functional layer is melt-coated on the undercoated polyester film' and then the obtained product is cooled and wound. The functional layer has a thickness of 30 μηι and a surface resistivity of ιχ1〇9 ohm/□. 2. 2 kg of polyacrylate copolymer (DSM, glass transition temperature 42 ° C) powder was dissolved in 16 kg of ethyl acetate solvent with stirring, and then 2 kg of toluene was added and further stirred for 5 minutes. For further application. The solid content of the acrylic resin in the solution is 丨. The solution was applied to the surface having the functional layer and the obtained product was dried in an oven to remove the solvent and wrap. The acrylic resin layer is a heat-sensitive adhesive layer having a thickness of about 1 μm. The surface of the heat-sensitive adhesive layer has a surface resistivity of 1 χ 1 〇 〇 ohm / mouth. 3. Apply an antistatic coating solution (κ1〇4Α·2, Qingdao Trade Import and Export Co., Ltd.) with a solid content of 5% to the PET surface of the heat-sealed crucible opposite to the functional layer and bake on the oven. Baked for solidation 160811.doc •23· 201244931. Antistatic coating in normal temperature and normal humidity environment

When the carrier tape is peeled off, the density of the peeling force ranges from about 20 g. The heat seal layer at the position where the cover tape is sealed is completely retained on the carrier tape, and a small amount of the work layer also resides on the carrier tape, so that the peeling is substantially peeled off due to the cohesive force of the functional layer. After the aging for 1 week at 52 t / 95 rh%, the average value of the peeling force and the fluctuation range of the peeling force were substantially unchanged. Comparative Example 2: Preparation of functional layer material: 30 kg of styrene-butadiene block copolymer (CHI mei, PB-5903), 70 kg of poly(ethylene acetate) (HyunDai, VA60), and 0.4 Kg Antioxidant A5 (Jinhai Albemarle, Shanghai Jinhai Albemarle

Fine Chemicals Co., Ltd.) was uniformly stirred, and melt-mixed at 180 ° C and then cooled and granulated for further use. Preparation of heat seal film and cover tape: 1. Coextruding the material obtained from the functional layer and linear low density polyethylene LLDPE (I002-YB, Exxon Mobil) and forming a film by a specific method and then winding For further application. The film has a total thickness of 35 μηι, wherein the functional layer has a thickness of 12 μm and the polyethylene layer has a thickness of 23 μm. 1608ll.doc -24- 201244931 2. Preparation of a 12 μπι thick single-sided corona discharge treated biaxially stretched polyester film. The surface of the corona discharge treatment was coated with a polyamino phthalate gel (35%, an adhesive available from MITSUI TAKEDA CHEMICAL, A-969V/A-5 of 3/1). The thickness of the glue after baking is about 2 μm. Combining the polyethylene surface of the above two-layer film with the surface of the gel-coated polyester film and then curing at room temperature. 3. Dissolving 2 kg of polyacrylate copolymer (DSM) powder under stirring 16 kg of ethyl acetate solvent, and then 2 kg of 20% hydrazine solution (nano tin oxide / cerium oxide solution) and 1 kg of toluene were added and further stirred at high speed for 5 minutes for further application. In the solution, the acrylic resin had a solid content of 9.5% and a ratio of cerium to acrylic resin of 1/5. The solution was applied to the surface of the polyester film combined with the functional layer and the obtained product was dried in an oven to remove the solvent and wound. The acrylic resin layer is a heat-sensitive adhesive layer having a thickness of about 0.55 (d). The surface of the heat-sensitive adhesive layer has a surface resistivity of lxio9 ohm/□. Today, the liver is coated with a 5% antistatic coating solution (ΚΚ) 4Α·2, Qingdao Trade Import and Exp〇rt Co., Ltd.) coated on the PET surface of the heat seal film opposite to the functional layer ±, and Bake in an oven for curing. Under normal temperature and normal humidity, antistatic coating 0.2 is called dry film thickness and surface resistivity of lxlQu ohm/q. For the heat _ produced, the optical transmittance (4) is (10), and the surface resistivity on the surface of the heat-sensitive adhesive is: 'III: the surface resistivity on the surface is 1×10 11 ohm/D. After the carrier tape was used, the lower seal was obtained by cutting the heat seal film from 1608] 1 .doc • 25· 201244931, and the average peel force was less than 30 g. A too small peel force will weaken the seal between the cover tape and the carrier tape, which tends to cause the tape opening. The results of the examples are summarized in the table below. 160811.doc -26- 201244931 Comparative Example 2 〇〇CN 0.4 (ATO powder) νη 00 ΙχΙΟ11 7 Comparative example 1 〇VH 〇in 00 lxio11 (N tn (NX example 4 〇〇<N 0.4 (ATO powder) 00 lxio11 〇Example 3 〇CN § 〇CN 0.15 (conductive carbon black) in lxio10 Example 2 37.5 67.5 〇»—η 〇1/1 oo lxio10 in Example 1 37.5 67.5 Ο 〇00 lxio10 jr> X Poly(vinyl acetate··^ 酉a 1 0 ^ op 〇 G 2 polyacrylate co-heat seal polymer / kg formulation ΑΤΟ / conductive carbon black / kg optical transmittance /% haze value /% heat seal layer surface resistivity / ohm / Peel force at 180°/g/mm Peel force at 180° after aging for 5 days at 52°C-95 rh%/g/mm Anti-sticking test at 60°C 160811.doc -27 - 201244931 The data indicates that the formulation of the functional layer has a significant influence on the size of the peeling force. Since the interface between the peeling heat seal layer and the functional layer in the present invention is peeled off when the cover tape is peeled off, or the cohesive force of the functional layer breaks the bow Stripping', so the formulation of the base resin used for the heat seal layer remains In the case of constant, the peeling force or cohesion of the functional layer when the heat-sealing layer is peeled off from the functional layer can be adjusted by changing the content of the styrene-butadiene-containing copolymer in the formulation for the functional layer. It can be seen that by increasing the content of the styrene-butadiene block copolymer, the peeling force is increased by 180. The fluctuation range of the peeling force is substantially constant. If a conductive polymer is added to the functional layer' Therefore, since the heat seal layer is extremely thin, the surface resistivity of the surface slightly changes and remains at ΙχΙΟ12 ohm/□. If the glass transition temperature of the heat seal layer is appropriately increased, the anti-sticking effect of the cover tape can be improved. When an inorganic filler is added to the sealing layer, the covering tape can provide antistatic property and an increased anti-sticking effect, but the haze value thereof is also increased at the same time. [Simplified Schematic] FIG. 1 is the electrostatic heat of the pit of the present invention. Figure 2 is a cross-sectional view of another antistatic heat sealing film of the present invention; and Figure 3 is a cross-sectional view of another antistatic heat sealing film of the present invention. [Main component symbol description] 1 Antistatic Coating 2 base layer 3 Functional layer 4 Thermal adhesive layer 5 Adhesive layer 6 Polyethylene layer I60811.doc ·28·

Claims (1)

201244931 VII. Patent application scope: ^ - A heat sealing film for encapsulating electronic components, comprising: a base layer; i - an intermediate layer provided on the base layer and comprising a mixture of materials The weight percent of the total weight of the intermediate layer comprises: 5% by weight to 7% by weight of the vinyl acetate copolymer, wherein the unit derived from vinyl acetate accounts for more than 10 mol% of the copolymer; 20 weight ❶ /. Up to 90% by weight of the styrene-butadiene copolymer; and up to 40% by weight of the conductive polymer; and at least one heat seal layer' is provided on the surface of the intermediate layer opposite to the base layer. 2. The heat seal film of claim 1, wherein the base layer is composed of a material selected from the group consisting of biaxially stretched 8 days, polyolefin or nylon (ny丨〇n). A heat seal film as claimed in claim 1, wherein the base layer has a thickness of from 1 pm to 3 〇卩m. The heat seal film of claim 1, wherein the base layer has an optical transmittance of not less than 85 Å/〇 and a tensile strength of not less than 50 MPa. . The heat-sealing film of claim 1, wherein in the vinyl acetate copolymer, the unit of the 'vinyl acetate is at least 2% by mole of the copolymer. The heat seal film of the item 1 wherein the styrene-butadiene copolymer is a block copolymer. 7. The heat-sealing film according to any one of claim 16, wherein in the styrene-butadiene 160811.doc 201244931 佛 copolymer, the units derived from the stupid ethylene account for the total number of units of the copolymer. 60 moles. /〇 above. 8. 9. 10. 16. 12. 13. 14. 15. 16. 17. The heat-sealing film of any one of clauses 1 to 6, wherein the styrene-butadiene copolymer has 4 〇, 〇 The weight average molecular weight of 〇〇 to 3〇〇〇〇〇. For example, the heat seal film of the applicant, wherein the vinyl acetate vinegar copolymer accounts for 1 〇 weight / 〇 to 60 weight 〇 / 〇 of the total weight of the intermediate layer. The heat-sealable film of claim 1, wherein the styrene-butadiene copolymer comprises from 3% by weight to 70% by weight of the total weight of the intermediate layer, wherein the conductive polymerization is performed. The matter accounts for 0 to 30% by weight of the total weight of the intermediate layer. The heat seal film of claim 1, wherein the ethyl acetate copolymer is a copolymer of ethylene carbonate and ethylene, such as the heat seal film of claim 1, wherein the conductive polymer is selected from the group consisting of: Polyacetylene, polypyrrole, polythiophene, polyaniline, polylysine based or poly(tetra)amine based intrinsic antistatic polymer' or combinations thereof. The heat seal film of claim 1 wherein the intermediate layer has a thickness of up to . The heat seal film of Yueshangdong 1 wherein the intermediate layer has a surface resistivity of from (7) 6 ohms / □ to 1 x 10 4 ohms / mouth. A heat sealable film according to claim 1, wherein the intermediate layer further contains 10% by weight to 60% by weight of the polyethylene based on the total weight of the main body. For example, "Heat Sealing Film of Monthly Item 16" in which all of the polyethylene is present in the intermediate layer as a polyethylene sublayer. The heat seal film of claim 16, wherein the polyethylene has a weight average molecular weight of from 100,000 to 1,000. 19. The heat seal film of claim 16, wherein the polyethylene has a melt index of from 1 g/i Torr to 1 〇〇 g/ιο minutes. 20. The heat seal film of claim 16, wherein the polyethylene sublayer has a thickness of from 10 μm to 30 μm. The heat seal film of claim 1 or 16, wherein the heat seal layer is composed of a material selected from the group consisting of poly(meth)acrylates or copolymers thereof. 22. The heat seal film of claim 1 or 16, wherein the heat seal layer further comprises a conductive filler, wherein the conductive filler is present in an amount of no more than 6% by weight based on the total weight of the entire heat seal layer. 23. The heat seal film of claim 22, wherein the heat seal layer has a thickness of from ^1^claw to (7)μηι. 24_ The heat seal film of claim 22, wherein the heat seal layer has a surface resistivity of from 1χ1〇7 ohm/port to ΙχΙΟ12 ohm/□. 25. The heat seal film of claim 22, wherein the conductive filler is selected from the group consisting of nano oxides, carbon nanotubes, carbon powder, metal powder, or mixtures thereof. 26. The heat seal film of claim 21, wherein the poly(meth)acrylate or poly(methyl') acrylate copolymer has a glass transition temperature of from 3 Torr to 90 °C. 27. The heat seal film of claim 21, wherein the poly(mercapto)acrylic or poly(meth)acrylic acid vinegar copolymer has a heat activation temperature of at least 9 Torr. 28. The heat seal film of claim 1, further comprising an adhesive layer between the intermediate layer and the base layer. 160811 .doc 201244931 29. The heat seal film of the applicant, further comprising an antistatic coating on a surface of the base layer opposite the intermediate layer. 30. The heat seal film of claim 29, wherein the dry film of the antistatic coating has a thickness of from 0.01 μm to 2 μm. 31. The heat seal film of claim 29, wherein the antistatic coating has a surface resistivity of from 1 χΐ〇 6 ohms/port to 1 χ 1012 ohms/square. 32. A cover for heat sealing i comprising a carrier tape of an electronic component, the cover tape comprising: a base layer as defined in any one of claims 1 to 31; as claimed in any one of claims 1 to 31 The intermediate layer defined by the item, wherein the intermediate layer is disposed on the base layer for dissipating the charge; the heat seal layer as defined in any one of claims 1 to 31, which is disposed on the intermediate layer; An optional antistatic coating as defined in any one of claims 29 to 31, which is located on a surface of the substrate layer opposite the intermediate layer, the cover tape having an average optical transmittance of at least 75%, An optical haze of more than about 5% and a surface resistivity of no more than about 1 <10»1; such that when the cover tape is heat sealed to the carrier tape to form an article, the coverage tape and the average of the carrier tape The peel strength is at least 20 gf/mm, and the peel strength is reduced by no more than about 1 〇〇/〇 when the article experiences a temperature of not less than about 50 C and a relative humidity of not less than about 90% for at least 5 days. 160811.doc