JP2008153586A - Substrate film for dicing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a substrate film for dicing, where cut refuse (thread-shaped or whisker-shaped refuse generated from the film after dicing) scarcely occurs in the dicing process of a semiconductor wafer, and to provide a dicing film. <P>SOLUTION: In the substrate film for multilayer dicing, a first layer includes a resin composition of 100 pts. wt made of 10-70 wt.% of a polypropylene-based resin (PP) and 30-90 wt.% of amorphous polyolefine and an olefine-based thermoplastic elastomer (TPO) of 10-200 pts. wt; a second layer includes a thermoplastic resin having rubber elasticity; and the first and second layers are laminated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dicing film for fixing a semiconductor wafer or the like when the semiconductor wafer or the like is diced into chips.

  The semiconductor wafer is made in advance with a large area, then diced into chips (cut and separated), and transferred to the mounting process. In the dicing, a dicing film is used for fixing the semiconductor wafer.

  The dicing film is basically composed of an adhesive layer for fixing the semiconductor wafer and a resin layer (a substrate film for dicing) that receives the cutting of the dicing cutter. The semiconductor wafer fixed to the dicing film is diced into chips, and is picked up after being uniformly expanded in the surface direction on the expanding ring in order to separate the chips.

  In the semiconductor wafer dicing process, the adhesive layer or a part of the substrate film for dicing is also cut together with the wafer, so that the resin becomes a molten state due to frictional heat of the resin, and resin-derived cutting waste (dicing waste) is generated. Since this cutting waste contaminates the wafer and lowers the yield of chips, it is necessary to reduce it as much as possible.

  For example, the following dicing film has been reported mainly for the purpose of eliminating cutting waste in the dicing process.

  Patent Document 1 describes a polyolefin film such as polyethylene irradiated with 1 to 80 Mrad of an electron beam or γ-ray as a base film. However, since this film crosslinks the entire crosslinkable resin with an electron beam or the like, it becomes hard and sufficient expandability cannot be obtained.

  Patent Document 2 describes an ethylene / methyl methacrylate copolymer film as a base film. However, although this film can reduce a certain amount of cutting waste, it is not always sufficient.

  Patent Document 3 mainly discloses a resin layer B mainly composed of an ionomer resin obtained by crosslinking a terpolymer of ethylene, (meth) acrylic acid, and a (meth) acrylic acid alkyl ester with a metal ion, and an adhesive layer. A semiconductor wafer fixing adhesive tape laminated with A is described. However, since this film contains metal ions, contamination of the wafer becomes a problem.

  Patent Document 4 discloses a resin in which an adhesive coated layer, a thermoplastic elastomer layer, and a resin layer are laminated in this order, and the thermoplastic elastomer layer contains 70% by mass or more of a hydrogenated styrene-butadiene copolymer. An adhesive tape base material comprising a composition and having a layer thickness of 30% or more with respect to the base material thickness is described. However, this film does not always have a sufficient cutting scrap reduction effect.

In Patent Document 5, in a base film comprising at least two layers, polypropylene is used as a resin for the adhesive layer side, and a hydrogenated styrene-butadiene copolymer is used as a layer other than the resin layer on the adhesive layer side. The use is described.
Japanese Patent Laid-Open No. 5-21234 JP-A-5-156214 Japanese Patent Laid-Open No. 9-8111 JP 2005-272724 A JP 2005-174963 A

  The main object of the present invention is to provide a substrate film for dicing and a dicing film in which cutting waste (thread-like or whisker-like waste generated from the film after dicing) is hardly generated in the dicing process of the semiconductor wafer.

  As a result of intensive studies to solve the above problems, the inventor has a resin composition comprising 10 to 70% by weight of a polypropylene resin (PP) and 30 to 90% by weight of an amorphous polyolefin as the first layer. And 200 parts by weight of an olefinic thermoplastic elastomer (TPO) with respect to 100 parts by weight of the resin composition, and a thermoplastic resin having rubber elasticity as the second layer, the first layer and the second layer It has been found that the substrate film for two-layer dicing formed by laminating layers hardly generates cutting waste during dicing processing of a semiconductor wafer.

  Based on this knowledge, further studies have been made and the present invention has been completed.

  That is, the present invention provides the following substrate film for dicing.

  Item 1. A substrate film for multi-layer dicing, wherein the first layer comprises 100 parts by weight of a resin composition comprising 10 to 70% by weight of a polypropylene resin (PP) and 30 to 90% by weight of an amorphous polyolefin, and an olefinic thermoplastic elastomer ( 10) to 200 parts by weight of TPO), the second layer contains a thermoplastic resin having rubber elasticity, and the first layer and the second layer are laminated.

  Item 2. The substrate film for multilayer dicing according to Item 1, wherein the second layer further comprises 10 to 45 parts by weight of an antistatic agent with respect to 100 parts by weight of the thermoplastic resin having rubber elasticity.

  Item 3. Item 3. The multilayer dicing substrate film according to Item 2, wherein the antistatic agent is a polyetheresteramide resin and / or a hydrophilic polyolefin resin.

  Item 4. Item 4. The structure according to Item 1, 2, or 3, wherein the multilayer dicing substrate film has a thickness of 50 to 300 µm, the first layer has a thickness of 45 to 295 µm, and the second layer has a thickness of 5 to 50 µm. Base film for multi-layer dicing.

  Item 5. A multilayer dicing film further comprising an adhesive layer and a release film on the first layer of the substrate film for dicing according to any one of Items 1 to 4.

  Item 6. A method for producing a substrate film for multilayer dicing, comprising 100 parts by weight of a resin composition comprising 10 to 70% by weight of a polypropylene resin (PP) and 30 to 90% by weight of an amorphous polyolefin, and an olefinic thermoplastic elastomer (TPO) And a second layer resin containing a thermoplastic resin having rubber elasticity is multilayer co-extrusion molded.

  Since the substrate film for dicing according to the present invention hardly generates cutting waste in the dicing process, there is no fear of wafer contamination.

I. Dicing Substrate Film The dicing substrate film of the present invention is a multi-layer dicing substrate film comprising at least two layers, and the first layer is 10 to 70% by weight of polypropylene resin (hereinafter also referred to as “PP”). The second layer includes 100 parts by weight of a resin composition composed of 30 to 90% by weight of crystalline polyolefin and 10 to 200 parts by weight of an olefinic thermoplastic elastomer (hereinafter also referred to as “TPO”), and the second layer is a heat having rubber elasticity. A plastic resin is included, and the first layer and the second layer are laminated.

  The thickness of the base film for two-layer dicing may be thicker than the cutting depth of the dicing blade and can be easily wound into a roll, and is, for example, 50 to 300 μm, preferably 60 to It is 250 micrometers, More preferably, it is 70-200 micrometers.

  Hereinafter, each layer of the two-layer dicing substrate film will be described.

First layer:
The first layer comprises 100 parts by weight of a resin composition comprising 10 to 70% by weight of polypropylene resin (PP) and 30 to 90% by weight of amorphous polyolefin, and 10 to 200 parts by weight of olefinic thermoplastic elastomer (TPO). Contains.

  The polypropylene resin (PP) used in the first layer is preferably crystalline. Examples of the crystalline propylene-based resin include a propylene homopolymer or a random or block copolymer of propylene and a small amount of α-olefin and / or ethylene. When the polypropylene resin is a copolymer, in the case of a random copolymer, the copolymerization ratio of other α-olefin and / or ethylene in the copolymer is generally 10% by weight or less, preferably Is 0.5 to 7% by weight. In the case of a block copolymer, the copolymerization ratio of other α-olefin and / or ethylene in the copolymer is generally 1 to 40% by weight, preferably 1 to 25%. % By weight, more preferably 2 to 20% by weight, particularly preferably 3 to 15% by weight. These polypropylene polymers may be a mixture of two or more polymers. As an index of the crystallinity of polypropylene, for example, a melting point, a heat of crystal melting, and the like are used.

  The polypropylene-based resin can employ multistage polymerization by combining a gas phase polymerization method, a bulk polymerization method, a solvent polymerization method and any combination thereof, and there is no particular limitation on the number average molecular weight of the polymer, Preferably, it is adjusted to 10,000 to 1,000,000.

  As this crystalline polypropylene resin, MFR (melt flow rate) measured at a temperature of 230 ° C. and a load of 21.18 N in accordance with JIS K7210 is 0.5 to 20 g / 10 minutes, preferably 0.5 to 10 g / 10. Good range of minutes.

  The amorphous polyolefin used in the first layer is composed of the following components.

  Amorphous polyolefin is an olefin copolymer composed essentially of two or more olefins selected from the group consisting of ethylene and α-olefins having 3 to 20 carbon atoms.

  Examples of the α-olefin having 3 to 20 carbon atoms include linear and branched α-olefins. Specific examples of the linear α-olefin include propylene, 1-butene and 1-pentene. 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-decene, 1-undecene, 1-dodecene, 1-tridecene, 1-tetradecene, 1-pentadecene, 1-hexadecene, 1-heptadecene, Examples include 1-octadecene, 1-nonadecene, 1-eicosene and the like, and examples of the branched α-olefin include 3-methyl-1-butene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2 -Ethyl-1-hexene, 2,2,4-trimethyl-1-pentene and the like are exemplified.

  The amorphous polyolefin preferably has an intrinsic viscosity [η] by a tetralin solvent at a temperature of 135 ° C. of preferably 0.3 to 10.0, more preferably 0.5 to 7.0, still more preferably 0.7. -5.0. The intrinsic viscosity [η] is measured using an Ubbelohde viscometer in 135 ° C. tetralin. 300 mg of a sample was dissolved in 100 ml tetralin to prepare a 3 mg / ml solution. Furthermore, the said solution is diluted 1/2, 1/3, and 1/5, and each is measured in a 135 degreeC (± 0.1 degreeC) thermostat oil bath. The measurement is repeated three times at each concentration, and the obtained values are averaged and used.

  Amorphous polyolefin has a peak of 1 J / g or more based on melting of a crystal and a peak of 1 J / g or more based on crystallization when measured according to JIS K 7122 using a differential scanning calorimeter (DSC). It is preferable not to have any of these. As the differential scanning calorimeter, for example, DSC-60 manufactured by Shimadzu Corporation is used, and both the temperature rising and temperature lowering processes are measured at a rate of 10 ° C./min.

  Amorphous polyolefins may exhibit adhesiveness when made into resin pellets, and some of the commercially available ones have been suppressed in adhesiveness by blending with polypropylene resins and the like. Here, the polypropylene resin may be the same as the polypropylene resin (PP) described above.

  Examples of the amorphous polyolefin include “Tough Selenium” manufactured by Sumitomo Chemical Co., Ltd. and “Tough Mer” manufactured by Mitsui Chemicals, Inc.

  The proportion of the polypropylene resin (PP) in the first layer is 10 to 70% by weight, preferably 30 to 50% by weight, based on the weight of the resin composition comprising the polypropylene resin (PP) and the amorphous polyolefin. More preferably, it is 20 to 50% by weight. The proportion of the amorphous polyolefin is 30 to 90% by weight, preferably 50 to 70% by weight, more preferably 50 to 80% by weight, based on the weight of the resin composition. This range is preferable because the generation of resin-derived cutting waste (dicing waste) by the dicing blade can be effectively suppressed during dicing.

  The first layer further contains an olefinic thermoplastic elastomer (TPO). The olefinic thermoplastic elastomer is specifically a composition in which the following component (A) is used as a matrix phase and component (B) is finely dispersed.

Component (A): a propylene homopolymer having an isotactic index of 85% or more, or a copolymer component of propylene and another α-olefin having 2 to 8 carbon atoms; 50% by weight,
Component (B): a copolymer component comprising propylene and ethylene as essential components and a copolymer of propylene and another α-olefin having 2 to 8 carbon atoms; 50 to 90 with respect to the entire composition weight%.

  The component (A) constituting the composition of the olefinic thermoplastic elastomer is a homopolymer of propylene having an isotactic index of 85% or more, or a copolymer of propylene and another α-olefin having 2 to 8 carbon atoms. Among them, a propylene homopolymer is preferable, and an isotactic index is preferably 90% or more.

  Examples of the other α-olefin in the copolymer of propylene and another α-olefin having 2 to 8 carbon atoms include, for example, ethylene, butene-1,3-methylbutene-1, pentene-1,4-methylpentene- 1, hexene-1, octene-1, and the like. Among them, ethylene is preferable, and the propylene content in the copolymer is preferably 85% by weight or more.

  The component (B) constituting the composition of the olefin-based thermoplastic elastomer is composed of a copolymer of propylene and another α-olefin having 2 to 8 carbon atoms, which contains propylene and ethylene as essential components. A copolymer of ethylene and ethylene is preferred.

  Examples of the other α-olefin having 2 to 8 carbon atoms include those similar to those in the component (A). The component (B) further includes 1,4-hexadiene, 5-methyl-1,5-hexadiene, 1,4-octadiene, cyclohexadiene, cyclooctadiene, dicyclopentadiene, 5-ethylidene-2-norbornene. , 5-butylidene-2-norbornene, 2-isopropenyl-5-norbornene and the like may be copolymerized in the component (B) in an amount of 0.5 to 10% by weight.

  In the composition of the olefin-based thermoplastic elastomer, the component (A) is 10 to 50% by weight (preferably 30 to 50% by weight), and the component (B) is 50 to 90% by weight (preferably 50 to 70% by weight). ).

  The olefinic thermoplastic elastomer is a composition produced by sequential polymerization in which the component (B) is polymerized after the polymerization of the component (A). The catalyst used for this sequential polymerization is composed of an organoaluminum compound and a solid component essentially comprising a titanium atom, a magnesium atom, a halogen atom, and an electron donating compound.

  In the method for producing an olefinic thermoplastic elastomer, propylene or propylene and another α-olefin having 2 to 8 carbon atoms are supplied in the first stage, and a temperature of 50 to 150 ° C. in the presence of the catalyst (preferably 50). ~ 100 ° C), and propylene homopolymer or propylene-α-olefin copolymer was polymerized under conditions of propylene partial pressure of 0.5 to 4.5 MPa (preferably 1.0 to 3.5 MPa). (A) component is manufactured. Subsequently, in the second stage, propylene and ethylene, or propylene and ethylene and an α-olefin having 4 to 8 carbon atoms are supplied, and in the presence of the catalyst, a temperature of 50 to 150 ° C. (preferably 50 to 100 ° C.), propylene And polymerization of propylene-ethylene copolymer or propylene-ethylene-α-olefin copolymer under conditions of 0.3 to 4.5 MPa (preferably 0.5 to 3.5 MPa) each of partial pressure of ethylene (B) component is manufactured.

The olefinic thermoplastic elastomer produced by the above method has a melt flow rate of 0.1 to 5 g / 10 minutes measured at a temperature of 230 ° C. and a load of 21.18 N in accordance with JIS K7210, and in water in accordance with JIS K7112. The density measured by the substitution method is 0.87 to 0.88 g / cm ³ .

  Specific examples of the olefinic thermoplastic elastomer include “Zeras” manufactured by Mitsubishi Chemical Corporation, “Newcon” manufactured by Nippon Polypro Co., Ltd., “Prime TPO” manufactured by Prime Polymer Co., Ltd., and the like.

  The content of TPO in the first layer is 10 to 200 parts by weight, preferably 30 to 100 parts by weight with respect to 100 parts by weight of the resin composition comprising the polypropylene resin (PP) and amorphous polyolefin. If it is this range, since generation | occurrence | production of the resin-derived cutting waste (dicing waste) by a dicing blade can be effectively suppressed at the time of dicing, it is preferable.

  The thickness of the first layer needs to be thicker than the depth of the deepest part of the cut of the dicer, and is usually 45 to 295 μm, preferably 40 to 280 μm, more preferably 30 to 250 μm. The thickness of the first layer is 65 to 98%, preferably 70 to 85%, with respect to the thickness of the dicing substrate film.

  If the thickness of the first layer is thinner than the depth of the deepest part of the cutting of the dicing blade, cutting waste is generated, which is not preferable.

  The first layer contains a predetermined proportion of polypropylene resin and amorphous polyolefin as essential components, and further this effect is increased by adding TPO.

Second layer:
The thermoplastic resin having rubber elasticity used in the second layer is uniformly expanded in contact with the expanding ring. Examples of the thermoplastic resin having rubber elasticity include, for example, low density polyethylene, medium density polyethylene, linear low density polyethylene which is an ethylene-α olefin copolymer or ultra low density polyethylene, and α-olefin is propylene, Butene-1, octene-1, 4-methylpentene-1, hexene-1, octene-1 resin, styrene copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-methyl acrylate copolymer ( EMA), ethylene-ethyl acrylate copolymer, ethylene-butyl acrylate copolymer, ethylene-methyl methacrylate copolymer (EMMA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl methacrylate copolymer, or these And a mixture of these resins. Of these, EMA, EMAA or EMMA is preferable, and EMA is particularly preferable.

  The second layer contains the above-described thermoplastic resin having rubber elasticity as an essential component, but may further contain an antistatic agent.

  As the antistatic agent used in the second layer, known surfactants such as anionic, cationic, and nonionic surfactants can be selected. In particular, from the viewpoint of durability and durability, polyether ester amide resin (hereinafter “ Nonionic surfactants such as a “PEEA resin” and a hydrophilic polyolefin resin (hereinafter referred to as “hydrophilic PO resin”) are suitable.

  The PEEA resin is a polymer composed of a polyether ester, which is a main unit component for imparting hydrophilicity, and a polyamide unit, and is commercially available or can be easily produced by a known method. Examples of the PEEA resin include Pelestat NC6321 from Sanyo Chemical Industries, Ltd. In addition, the production method is described in JP-A-64-45429, JP-A-6-287547, etc. According to this, for example, a polydiol component having an ether group in the main chain is added to a dicarboxylic acid. It can be produced by reacting the components into a terminal ester and reacting this with an aminocarboxylic acid or lactam. The PEEA resin has good compatibility with any of the above-mentioned layers of resin, and there is no phenomenon of bleeding out.

  Examples of the hydrophilic PO resin include hydrophilic polyethylene (hereinafter referred to as “hydrophilic PE resin”) or hydrophilic polypropylene (hereinafter referred to as “hydrophilic PP resin”).

  The hydrophilic PE resin or the hydrophilic PP resin is basically a block in which a polyethylene chain or a polypropylene chain and a polyoxyalkylene chain are bonded to each other, exhibiting a high static elimination action and eliminating the accumulation of static electricity. This bonding is performed by an ester group, an amide group, an ether group, a urethane group or the like. From the viewpoint of compatibility with the film resin, this bond is preferably an ester group or an ether group. As the hydrophilic PP resin, for example, Pelestat 230 manufactured by Sanyo Chemical Industries, Ltd. is exemplified.

  The molecular weight of the polyethylene chain or the polypropylene chain in the hydrophilic PE resin or the hydrophilic PP resin is, for example, about 1200 to 6000. This is because, within this molecular weight range, it is easy to acid-modify polyethylene or polypropylene at the stage before block bonding polyethylene or polypropylene to the polyoxyalkylene chain.

  The molecular weight of the polyoxyalkylene chain in the hydrophilic PE resin or hydrophilic PP resin is preferably about 1000 to 15000 from the viewpoint of heat resistance and reactivity with polyethylene or polypropylene after acid modification. The molecular weight described above is a value measured using GPC.

The hydrophilic PE resin or the hydrophilic PP resin can be produced by, for example, acid-modifying polyethylene or polypropylene having the above-described molecular weight and reacting this with polyalkylene glycol. More details are described in, for example, Japanese Patent Application Laid-Open Nos. 2001-278985 and 2003-48990. When the second layer contains an antistatic agent, the content of the antistatic agent is 10 to 45 parts by weight, preferably 15 to 30 parts by weight, based on 100 parts by weight of the thermoplastic resin having rubber elasticity. If it is in such a range, it is generated in the expanding step after the dicing step because semiconductivity is effectively imparted without impairing slipperiness when uniformly expanded in contact with the expanding ring of the third layer. Static electricity can be quickly eliminated. For example, the film of the present invention containing the antistatic agent in the above-described range is preferable because the surface resistivity of the back surface, that is, the third layer surface is about 10 ⁷ to 10 ¹² Ω / □.

  An antiblocking agent or the like may be further added to the second layer as long as the effects of the present invention are not adversely affected. By adding an anti-blocking agent, blocking such as when the substrate film for dicing is rolled up is preferably suppressed. Examples of the anti-blocking agent include inorganic or organic fine particles.

  The thickness of the second layer is usually 5 to 50 μm, preferably 10 to 40 μm, more preferably 15 to 30 μm. The thickness of the second layer is 2 to 20%, preferably 5 to 15%, with respect to the thickness of the dicing substrate film. It is important that the deepest portion of the dicer not reach the second layer.

  The substrate film for two-layer dicing is manufactured by multilayer coextrusion molding of the resin constituting the first layer and the second layer. Specifically, 100 parts by weight of a resin composition comprising 10 to 70% by weight of a polypropylene resin (PP) and 30 to 90% by weight of an amorphous polyolefin and 10 to 200 parts by weight of an olefinic thermoplastic elastomer (TPO). The resin for the first layer containing, and the resin for the second layer containing the thermoplastic resin having rubber elasticity are produced by multilayer coextrusion molding.

  The resin for the first layer is prepared by dry blending or melt-kneading PP and amorphous polyolefin, and adding TPO and other components as necessary thereto. The second layer resin is prepared by adding other components such as an antistatic agent to a thermoplastic resin having rubber elasticity, if necessary.

  The above-mentioned first layer resin and second layer resin are respectively supplied to a screw type extruder, extruded from a multilayer T die at 180 to 225 ° C., and passed through a cooling roll at 50 to 70 ° C. While cooling, it is taken up substantially unstretched. Alternatively, the resin for each layer may be once obtained as pellets and then extruded as described above.

  The reason why the film is substantially unstretched at the time of taking is to effectively extend the film after dicing. This substantially non-stretching includes non-stretching or slight stretching that does not adversely affect the expansion of the dicing film. In general, the film may be pulled to such an extent that no sagging occurs during film take-up.

II. Dicing film The substrate film for multi-layer dicing obtained as described above has a pressure-sensitive adhesive layer formed by coating a known pressure-sensitive adhesive on the film, and a release film is provided on the pressure-sensitive adhesive layer. Manufactured. An adhesive layer and a release film are formed on the first layer of the multi-layer dicing substrate film.

  As the pressure-sensitive adhesive component used in the pressure-sensitive adhesive layer, known ones are used, and for example, the pressure-sensitive adhesive component described in JP-A No. 5-21234 can be used. A known release film is also used.

The pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is preferably an acrylic pressure-sensitive adhesive. Specifically, the pressure-sensitive adhesive layer was selected from a homopolymer and a copolymer having (meth) acrylic acid ester as a main constituent monomer unit. Acrylic polymers, copolymers with other functional monomers, and mixtures of these polymers are used. For example, (meth) acrylic acid ester includes ethyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, glycidyl methacrylate, 2-hydroxyethyl methacrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, Glycidyl acrylate, 2-hydroxyethyl acrylate and the like can be preferably used. The molecular weight of the acrylic polymer is ^{1.0 × 10 5 ~10.0 × 10 5} , ^{preferably, 4.0 × 10 5 ~8.0 × 10} 5.

  Further, by including a radiation polymerizable compound in the pressure-sensitive adhesive layer as described above, the adhesive strength can be reduced by irradiating the pressure-sensitive adhesive layer with radiation after the wafer is cut and separated. As such a radiation polymerizable compound, for example, a low molecular weight compound having at least two photopolymerizable carbon-carbon double bonds in a molecule that can be three-dimensionally reticulated by light irradiation is widely used (for example, JP JP-A-60-196,956, JP-A-60-223,139, etc.).

  Specifically, trimethylolpropane triacrylate, tetramethylolmethane tetraacrylate, pentaerythritol triacrylate, pentaerythritol tetraacrylate, dipentaerythritol monohydroxypentaacrylate, dipentaerythritol hexaacrylate or 1,4-butylene glycol diacrylate, 1,6-hexanediol diacrylate, polyethylene glycol diacrylate, commercially available oligoester acrylate, and the like are used.

  Furthermore, in addition to the acrylate compounds as described above, urethane acrylate oligomers can also be used as the radiation polymerizable compound. The urethane acrylate oligomer is obtained by reacting an acrylate or methacrylate having a hydroxyl group with a terminal isocyanate urethane prepolymer obtained by reacting a polyol compound such as a polyester type or a polyether type with a polyvalent isocyanate compound. This urethane acrylate oligomer is a radiation polymerizable compound having at least one carbon-carbon double bond.

  Further, in the pressure-sensitive adhesive layer, in addition to the above-mentioned pressure-sensitive adhesive and radiation-polymerizable compound, if necessary, a compound that is colored by radiation irradiation (such as a leuco dye), a light-scattering inorganic compound powder, abrasive grains (A particle size of about 0.5 to 100 μm), an isocyanate curing agent, a UV initiator, and the like can also be contained.

  The dicing film is usually obtained in a rolled state cut into a tape shape.

  Hereinafter, the present invention will be described in more detail using Examples and Comparative Examples, but the present invention is not limited to these Examples. “%” Means% by weight, and “part” means part by weight.

  The following abbreviations have the following meanings:

T3522: Amorphous polyolefin (Sumitomo Chemical Co., Ltd. Tough selenium T3522: Amorphous polyolefin component 70 wt%, propylene homopolymer (polypropylene resin) component 30 wt%)
PP: Polypropylene resin (PC412 manufactured by Sun Allomer)
TPO1: Olefin-based thermoplastic elastomer (Nippon Polypropylene Newcon NAR6)
TPO2: Olefin thermoplastic elastomer (Mitsubishi Chemical Corporation Zelas 7023)
EMA: ethylene-methyl acrylate copolymer (9MA manufactured by Atofina Japan)
Since T3522 includes 70% by weight of an amorphous polyolefin component and 30% by weight of a polypropylene-based resin component, for example, when T3522 as a resin for the first layer includes 70% by weight and 30% by weight of PP, amorphous 49% by weight of the conductive polyolefin component and 51% by weight of the PP component.

Example 1
90% by weight of T3522 and 10% by weight of PP were dry blended, and 10 parts by weight of TPO1 was added to 100 parts by weight of the blend. This was used as the resin for the first layer.

  EMA was used as the second layer resin.

  The resin for the first layer and the resin for the second layer were supplied to a multilayer extruder having a barrel temperature of 180 to 220 ° C. It was extruded from a 230 ° C. T die, cooled and solidified with a take-up roll having a set temperature of 60 ° C., and wound up in an unstretched state.

  The thickness of the obtained film was 110 μm for the first layer and 40 μm for the second layer, and the total thickness was 150 μm. See Table 1.

Examples 2-12
A multilayer film was obtained by processing in the same manner as in Example 1 with the blending amounts shown in Table 1. Table 1 shows the thickness of each film.

Example 13
90% by weight of T3522 and 10% by weight of PP were dry blended, and 10 parts by weight of TPO2 was added to 100 parts by weight of the blend. This was used as the resin for the first layer.

  EMA was used as the second layer resin.

  The resin for the first layer and the resin for the second layer were supplied to a multilayer extruder having a barrel temperature of 180 to 220 ° C. It was extruded from a 230 ° C. T die, cooled and solidified with a take-up roll having a set temperature of 60 ° C., and wound up in an unstretched state.

  The thickness of the obtained film was 110 μm for the first layer and 40 μm for the second layer, and the total thickness was 150 μm. See Table 2.

Examples 14-18
A multilayer film was obtained by the same treatment as in Example 13 with the blending amounts shown in Table 2. Table 2 shows the thickness of each film.

Example 19
A multilayer film was obtained in the same manner as in Example 1 except that 20 parts by weight of P230 was added to 100 parts by weight of EMA as the third layer resin. The film thickness is as shown in Table 3.

Examples 20-24
A multilayer film was obtained by the same treatment as in Example 19 with the blending amounts shown in Table 3. Table 3 shows the thickness of each film.

Comparative Examples 1 and 2
A multilayer film was obtained by the same treatment as in Example 1 with the blending amounts shown in Table 4. Table 4 shows the thickness of each film.

Test Example 1 (Evaluation method for cutting waste)
A part of the film obtained in Examples 1 to 24 and Comparative Examples 1 and 2 was cut into a circular shape with a diameter of 180 mm to obtain a measurement sample, and a grinding apparatus (AUTOMATIC DICING SAW DAD-2H manufactured by DISCO Corporation) / 6), cut into the base film under the following conditions, then remove the sample from the grinding machine and let it dry at room temperature in a clean booth for 24 hours, then digital microscope manufactured by Keyence Corporation (VHX- 100), the presence or absence of cutting waste was evaluated at a magnification of 100 times.

The surface of the sample was arbitrarily observed at 10 locations, and “◯” was given when there was no cutting waste, and “X” was given when it was recognized that there was even a small amount of cutting waste. The results are summarized in Table 5.
(Cutting conditions)
Rotation speed: 30000rpm
Speed: 80mm / sec
Cut mode: Full-auto dicing of 10mm □ Cut depth: 100μm
Blade: Disco B1A801 SDC 400N50M51 (outer diameter 56mm x thickness 0.2mm x inner diameter 40mm)
Water volume: 1.2L / min

  In Examples 1-24, the cutting waste did not generate | occur | produce and was favorable.

  In Comparative Example 1, cutting scraps were generated because the amount of the amorphous polyolefin in the first layer was small. In Comparative Example 2, cutting waste was generated because the amount of TPO in the first layer was large.

  After dicing the film of Example 5 and Comparative Example 2, photographs obtained by observing the diced cross-cut portion using a digital microscope (VHX-100) manufactured by Keyence Corporation are shown in FIGS. In FIG. 2, it was found that no cutting waste was generated, whereas in FIG. 3, a large amount of cutting waste was generated.

6 is a photograph of a scanning probe microscope (using SPM-9600 manufactured by Shimadzu Corporation) of the film of Example 5. After the film of Example 5 was diced, the photograph which observed the diced cross cutting part using the digital microscope (VHX-100) by Keyence Corporation is shown. After dicing the film of the comparative example 2, the photograph which observed the cross cutting part which carried out the dicing using the digital microscope (VHX-100) by Keyence Corporation is shown.

Claims (6)

  A substrate film for multi-layer dicing, wherein the first layer comprises 100 parts by weight of a resin composition comprising 10 to 70% by weight of a polypropylene resin (PP) and 30 to 90% by weight of an amorphous polyolefin, and an olefinic thermoplastic elastomer ( 10) to 200 parts by weight of TPO), the second layer contains a thermoplastic resin having rubber elasticity, and the first layer and the second layer are laminated.   The base film for multi-layer dicing according to claim 1, wherein the second layer further comprises 10 to 45 parts by weight of an antistatic agent with respect to 100 parts by weight of the thermoplastic resin having rubber elasticity.   The substrate film for multilayer dicing according to claim 2, wherein the antistatic agent is a polyetheresteramide resin and / or a hydrophilic polyolefin resin.   The thickness of the base film for multilayer dicing is 50 to 300 µm, the thickness of the first layer is 45 to 295 µm, and the thickness of the second layer is 5 to 50 µm. Base film for multilayer dicing.   A multilayer dicing film further comprising an adhesive layer and a release film on the first layer of the substrate film for dicing according to any one of claims 1 to 4.   A method for producing a substrate film for multilayer dicing, comprising 100 parts by weight of a resin composition comprising 10 to 70% by weight of a polypropylene resin (PP) and 30 to 90% by weight of an amorphous polyolefin, and an olefinic thermoplastic elastomer (TPO) And a second layer resin containing a thermoplastic resin having rubber elasticity is multilayer co-extrusion molded.

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