WO2013146174A1 - 熱可塑性液晶ポリマーフィルムおよびその製造方法 - Google Patents
熱可塑性液晶ポリマーフィルムおよびその製造方法 Download PDFInfo
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- WO2013146174A1 WO2013146174A1 PCT/JP2013/056387 JP2013056387W WO2013146174A1 WO 2013146174 A1 WO2013146174 A1 WO 2013146174A1 JP 2013056387 W JP2013056387 W JP 2013056387W WO 2013146174 A1 WO2013146174 A1 WO 2013146174A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/005—Shaping by stretching, e.g. drawing through a die; Apparatus therefor characterised by the choice of materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
- B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—Films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K19/00—Liquid crystal materials
- C09K19/04—Liquid crystal materials characterised by the chemical structure of the liquid crystal components, e.g. by a specific unit
- C09K19/38—Polymers
- C09K19/3804—Polymers with mesogenic groups in the main chain
- C09K19/3809—Polyesters; Polyester derivatives, e.g. polyamides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2101/00—Use of unspecified macromolecular compounds as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0079—Liquid crystals
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2007/00—Flat articles, e.g. films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/20—Polymers characterized by their physical structure
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2300/00—Characterised by the use of unspecified polymers
- C08J2300/22—Thermoplastic resins
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/04—Polyesters derived from hydroxy carboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2219/00—Aspects relating to the form of the liquid crystal [LC] material, or by the technical area in which LC material are used
- C09K2219/03—Aspects relating to the form of the liquid crystal [LC] material, or by the technical area in which LC material are used in the form of films, e.g. films after polymerisation of LC precursor
Definitions
- the present invention relates to a film (hereinafter, this may be referred to as a thermoplastic liquid crystal polymer) made of a thermoplastic polymer capable of forming a uniaxially or biaxially stretched optically anisotropic melt phase. May be referred to as a thermoplastic liquid crystal polymer film or a liquid crystal polymer film) and a method for producing the same.
- a film hereinafter, this may be referred to as a thermoplastic liquid crystal polymer
- a thermoplastic liquid crystal polymer film or a liquid crystal polymer film a method for producing the same.
- Thermoplastic liquid crystal polymer films have excellent low moisture absorption, heat resistance, chemical resistance, and electrical properties, and are rapidly commercialized as electrical insulating materials for printed wiring boards and the like. .
- thermoplastic liquid crystal polymer is made of rigid mesogen groups, and when extrusion molding is performed, the rigid mesogen groups are highly oriented by the shearing force generated in the extrusion. Such orientation of the mesogenic group also contributes to excellent dimensional stability of the liquid crystal polymer film.
- the liquid crystal polymer film has low elongation as a trade-off excellent in dimensional stability as described above.
- the liquid crystal polymer flows so that the mesogenic groups are not entangled with each other due to the alignment of the rigid mesogenic groups, the apparent melt viscosity of the liquid crystal polymer is rapidly decreased in a low shear rate region. Therefore, when the temperature is raised to near the melting point for stretching, the fluidity of the polymer is rapidly increased, and it is impossible to stretch the film alone.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-3409178 discloses a method in which a laminate of a raw film made of a liquid crystal polymer and a fluororesin porous film is stretched and then the fluororesin porous film is peeled off.
- a liquid crystal polymer film having a melting point of 335 ° C. or higher is disclosed.
- liquid crystal polymer film disclosed in this patent document needs to be stretched using a fluororesin porous film, there is a possibility that fluorine is transferred to the obtained film.
- fluorine since a special fluorine film is used, it is difficult to achieve mass production and cost reduction of the liquid crystal polymer film.
- an object of the present invention is to provide a thermoplastic liquid crystal polymer film that is stretched without using a special support.
- Another object of the present invention is to provide a thermoplastic liquid crystal polymer film with less thickness unevenness.
- Still another object of the present invention is to provide a thermoplastic liquid crystal polymer film having a thickness of less than 50 ⁇ m (particularly 40 ⁇ m or less) and having a small thickness unevenness.
- Another object of the present invention is to provide a method for efficiently producing such a thermoplastic liquid crystal polymer film.
- the inventors of the present invention surprisingly adjusted the dielectric constant in the liquid crystal polymer film to show a specific value in both the TD direction and the MD direction.
- the elongation of a liquid crystal polymer film having almost no elongation can be significantly increased. This is a very surprising discovery in view of the general knowledge that liquid crystal polymer films have low elongation as a trade-off for high dimensional stability.
- the liquid crystal polymer film adjusted so that the in-plane dielectric constant becomes a specific value is the same as that of the stretching conditions (that is, the support in the vicinity of the melting point). It is not necessary to stretch by stretching in a laminated state), and by performing specific temperature control, it is possible to stretch the film alone, and the liquid crystal polymer film obtained can be highly controlled in thickness unevenness.
- the present invention has been completed.
- the present invention is based on a thermoplastic polymer (hereinafter referred to as a thermoplastic liquid crystal polymer) capable of forming an optically anisotropic melt phase having a dielectric constant of 3.25 or less in both the MD direction and the TD direction.
- a thermoplastic polymer hereinafter referred to as a thermoplastic liquid crystal polymer
- Stretching step to stretch Is a method for producing a thermoplastic liquid crystal polymer film. In this stretching step, the film alone may be stretched without using the support.
- the manufacturing method Prior to the stretching step, includes: A laminating step of obtaining a laminate by joining a raw film made of a thermoplastic liquid crystal polymer and a support such as a metal foil; Heat treating the laminate, and adjusting the dielectric constant of the thermoplastic liquid crystal polymer film after the heat treatment to be 3.25 or less in both the MD direction and the TD direction; A separation step of separating the film having the adjusted dielectric constant and the support.
- the heat deformation temperature of the heat-treated film may be increased by 40 to 100 ° C. from the heat deformation temperature of the original film.
- the heating temperature in the stretching step is in the range of 40 ° C. lower than the thermal deformation temperature (Td) of the stretched film (Td ⁇ 40 ° C.) to 10 ° C. lower than Td (Td ⁇ 10 ° C.). Is preferred.
- the present invention includes a thermoplastic liquid crystal polymer film produced by the above production method.
- a thermoplastic liquid crystal polymer film produced by the above production method.
- Such a film may have a thickness unevenness of 10% or less.
- the width in the TD direction may be in the range of 0.2 to 1.2 m.
- the thickness of the film after stretching may be, for example, 40 ⁇ m or less.
- the original film means a film in which a melted resin is formed into a melt sheet by extrusion molding, and then cooled and wound up.
- the film may be subjected to a stretching process for stretching the melt sheet.
- the MD direction means the machine axis direction of the film
- the TD direction means a direction orthogonal to the MD direction.
- thermoplastic liquid crystal polymer film of the present invention a film having a specific dielectric constant in a plane can be stretched by a specific stretching condition, whereby the film can be stretched by itself, thereby causing uneven thickness.
- a reduced thermoplastic liquid crystal polymer film can be efficiently produced.
- the method for producing a thermoplastic liquid crystal polymer film of the present invention not only has little thickness unevenness, but also can efficiently produce a film having a wide range of thickness according to the application.
- thermoplastic liquid crystal polymer film with little thickness unevenness can improve the reliability of the substrate when used for a printed wiring board, for example.
- a preparatory step for preparing a film made of a thermoplastic liquid crystal polymer having a dielectric constant of 3.25 or less in both the MD direction and the TD direction, and stretching for heating and stretching the film at a specific temperature Process At least.
- thermoplastic liquid crystal polymer film has such a dielectric constant
- it can be used alone for the stretching step.
- a laminate of a raw film and a support described below is laminated prior to the stretching step. You may provide the process, the dielectric constant adjustment process of a film, and the isolation
- thermoplastic liquid crystal polymer film (or thermotropic liquid crystal polymer film) of the present invention is composed of a liquid crystalline polymer that can be melt-molded (or a polymer that can form an optically anisotropic molten phase), and this thermoplastic liquid crystal polymer. Is not particularly limited as long as it is a liquid crystalline polymer that can be melt-molded.
- a thermoplastic liquid crystalline polyester or a thermoplastic liquid crystalline polyester amide having an amide bond introduced thereto may be used. Can be mentioned.
- the thermoplastic liquid crystal polymer may be a polymer in which an aromatic polyester or an aromatic polyester amide is further introduced with an isocyanate-derived bond such as an imide bond, a carbonate bond, a carbodiimide bond, or an isocyanurate bond.
- an isocyanate-derived bond such as an imide bond, a carbonate bond, a carbodiimide bond, or an isocyanurate bond.
- thermoplastic liquid crystal polymer used in the present invention include known thermoplastic liquid crystal polyesters and thermoplastic liquid crystal polyester amides derived from the compounds (1) to (4) listed below and derivatives thereof. Can be mentioned. However, it goes without saying that there is an appropriate range of combinations of various raw material compounds in order to form a polymer capable of forming an optically anisotropic melt phase.
- Aromatic or aliphatic dihydroxy compounds (see Table 1 for typical examples)
- Aromatic diamine, aromatic hydroxyamine or aromatic aminocarboxylic acid (see Table 4 for typical examples)
- a polymer containing p-hydroxybenzoic acid and / or 6-hydroxy-2-naphthoic acid as at least a repeating unit is preferable.
- at least one aromatic hydroxycarboxylic acid selected from the group consisting of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid and 4,4 ′ A repeating unit of at least one aromatic diol selected from the group consisting of dihydroxybiphenyl and hydroquinone and at least one aromatic dicarboxylic acid selected from the group consisting of terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid Polymers containing are preferred.
- the repeating unit (A) of p-hydroxybenzoic acid is used.
- At least one aromatic hydroxycarboxylic acid (C) selected from the group consisting of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid, and 4,4′-dihydroxy At least one aromatic diol (D) selected from the group consisting of biphenyl and hydroquinone, and at least one aromatic dicarboxylic acid (E) selected from the group consisting of terephthalic acid, isophthalic acid and 2,6-naphthalenedicarboxylic acid.
- optical anisotropy at the time of melting referred to in the present invention can be recognized by, for example, placing a sample on a hot stage, heating and heating in a nitrogen atmosphere, and observing the transmitted light of the sample.
- the thermoplastic liquid crystal polymer preferably has a melting point (hereinafter referred to as Tm) in the range of 260 to 360 ° C., more preferably Tm of 270 to 350 ° C.
- Tm is calculated
- thermoplastic liquid crystal polymer polyethylene terephthalate, modified polyethylene terephthalate, polyolefin, polycarbonate, polyarylate, polyamide, polyphenylene sulfide, polyester ether ketone, fluororesin, etc., as long as the effects of the present invention are not impaired.
- thermoplastic polymers, various additives, fillers and the like may be added.
- thermoplastic liquid crystal polymer Using such a thermoplastic liquid crystal polymer, a target thermoplastic liquid crystal polymer film can be produced through the following steps.
- the raw film made of the thermoplastic liquid crystal polymer used in the present invention is obtained by extrusion molding of a thermoplastic liquid crystal polymer.
- Any extrusion molding method can be applied as long as the direction of the rigid rod-like molecules of the thermoplastic liquid crystal polymer can be controlled, but the known T-die method, laminate stretching method, inflation method and the like are industrially advantageous.
- stress is applied not only in the mechanical axis direction of the film (hereinafter abbreviated as MD direction) but also in the direction orthogonal to this (hereinafter abbreviated as TD direction).
- MD direction mechanical axis direction of the film
- TD direction direction orthogonal to this
- the melt sheet extruded from the T-die is used in the machine axis direction of the film (hereinafter referred to as MD).
- MD machine axis direction of the film
- TD direction machine axis direction of the film
- TD direction melt sheet extruded from a T die is once stretched in the MD direction. Then, it may be stretched in the TD direction.
- a predetermined draw ratio corresponding to the MD direction draw ratio
- blow ratio in the TD direction draw ratio
- the laminate of the obtained raw film and the support can be produced according to a known method.
- the support is not particularly limited as long as it has a higher melting point than the liquid crystal polymer film being heated, and examples thereof include inorganic substances such as glass and various metal foils.
- the metal forming the metal foil include copper, gold, silver, nickel, and aluminum. Among them, copper and aluminum are preferable, and aluminum is particularly preferable.
- Examples of the method for joining the original film and the support include a method in which the original film and the support are thermocompression bonded to form a laminate, and a method in which the two are bonded using an adhesive.
- the method of thermocompression bonding the raw film and the support is preferable.
- the thermocompression bonding can be performed using a known means such as a heat press or a heat roller.
- the layer structure of the laminate is not particularly limited, and a plurality of raw film and a plurality of supports may be laminated.
- the laminate may have a two-layer structure in which a support is laminated on one side of the original film, or may have a three-layer structure in which a support is laminated on both sides of the original film.
- the substrate may have a three-layer structure in which a raw film is laminated on both surfaces of the support. Of these, a two-layer structure is preferred.
- the laminate is heat-treated, and the film after the heat treatment is adjusted to have a specific dielectric constant in both the TD direction and the MD direction.
- the laminate is continuously fed into the heat treatment apparatus, for example, a temperature 15 ° C. lower than the melting point (Tm) of the raw film (Tm-15) ° C. and a temperature 30 ° C. higher than the melting point. Heat treatment is performed within the range of (Tm + 30) ° C.
- the heating temperature may be in a range from a temperature (Tm ⁇ 10) ° C. that is 10 ° C. lower than the melting point (Tm) of the raw film to a temperature (Tm + 20) ° C. that is 20 ° C. higher than the melting point.
- a known apparatus such as a hot air circulating furnace, a hot roll, or a ceramic heater can be used.
- the heating time may be, for example, a short time of about 3 to 300 seconds, preferably about 5 to 60 seconds.
- a heat treatment may be performed by combining a short-time heat treatment and a long-time heat treatment. After the short-time heat treatment, if necessary, the laminate may be treated as a long-time heat treatment. In the range from 40 ° C. lower than the melting point (Tm) of the raw film (Tm-40) ° C. to 5 ° C. lower than the melting point (Tm-5) ° C., for a long time (for example, about 2 to 24 hours, Heat treatment may be performed (preferably about 4 to 16 hours).
- the melting point of the raw film may be increased by heating.
- the following heat treatment can be used.
- First time The melting peak temperature TA of the film in a temperature range (Td ⁇ (Tm ⁇ ° C.)) where the heat treatment temperature is from the thermal deformation temperature Td of the film to a temperature lower by ⁇ ° C. than the melting point Tm before the heat treatment of the film.
- a heat treatment until it reaches a temperature TA 1 from beta ° C. melting point Tm before the heat treatment of the film.
- ⁇ 5-20; n-th round in a temperature range of less than TA n-1 at the heat treatment temperature is the melting peak temperature TA n-2 or more, a heat treatment is performed until the TA n-1 reaches a temperature TA n that is increased gamma ° C.
- an integer n ⁇ 3 and ⁇ 5 to 20.
- the melting peak temperature means a temperature corresponding to a position during and after the heat treatment of the endothermic peak that appears when the film is heated at a rate of 5 ° C./min.
- the heat treatment may be performed under tension or without tension in a heat treatment apparatus such as a hot-air circulating furnace, a hot roll, or a ceramic heater.
- heat treatment is in the form of a roll (prevents contact by providing a gap), casket (wound together with a spacer with good gas permeability, for example, a spacer made of Vectran nonwoven fabric that can absorb expansion and contraction during heat treatment) (Put on a wire mesh etc.).
- the temperature of the heat treatment apparatus may be increased stepwise.
- the molecular weight By continuously heating in such a temperature range, the molecular weight can be increased in a state where the molecular orientation is disturbed.
- the increase in molecular weight can be confirmed by an increase in the thermal deformation temperature of the film.
- the thermal deformation temperature of the film may be increased by, for example, about 40 to 90 ° C., preferably about 50 to 80 ° C., from the thermal deformation temperature of the raw film.
- Such film stretching characteristics become particularly prominent when the dielectric constant is in a specific state and the molecular weight of the molecules in the film is increased by heating. That is, in this case, it is possible to increase intermolecular entanglement and improve the stretchability of the film alone by performing high-temperature treatment for a longer time in a state where the molecular orientation is disturbed to the same extent in the plane. is there.
- Separatation process After the molecular weight of the liquid crystal polymer forming the film has increased, the film is separated from the support.
- the separation means include separation of the support by etching, physical peeling between the film and the support, and the like.
- a film separated from a support or a film made of a thermoplastic liquid crystal polymer prepared by a preparation step has a dielectric constant of 3.25 or less in both the MD direction and the TD direction. And within the range of the temperature (Td-60 ° C.) lower by 60 ° C. from the thermal deformation temperature (Td) of the film to be stretched for the stretching treatment to the temperature lower by 5 ° C. (Td-5 ° C.).
- the film is stretched by heating.
- the heating temperature may be in the range of a temperature lower by 40 ° C. (Td ⁇ 40 ° C.) to a temperature lower than Td by 10 ° C.
- Td ⁇ 10 ° C. thermal deformation temperature (Td) of the separated film.
- the stretching method itself is known, and either biaxial stretching or uniaxial stretching may be adopted, but biaxial stretching is preferred because it is easier to control the degree of molecular orientation.
- a known uniaxial stretching machine, simultaneous biaxial stretching machine, sequential biaxial stretching machine or the like can be used.
- the stretching speed may be configured so as to control the stretching speed in one of the MD direction and the TD direction as in the stretching ratio, or the stretching speed in both directions may be controlled simultaneously. May be.
- the draw ratio can be appropriately set according to the thickness of the raw film and the desired liquid crystal polymer film, and is, for example, in the range of 1.1 to 15 times, preferably 1.5 to 8 times. .
- the stretching speed is usually in the range of 5 to 100% / second, preferably 10 to 80% / second. Through such a stretching step, the thermoplastic liquid crystal polymer film of the present invention can be obtained.
- thermoplastic liquid crystal polymer film The thermoplastic liquid crystal polymer film of the present invention thus obtained can be stretched at a low temperature without using a support, so that it becomes a film with little thickness unevenness.
- the thermoplastic liquid crystal polymer film may have a thickness unevenness of 10% or less, preferably 7% or less, more preferably 5% or less.
- thickness unevenness is a value measured by the method described in the Example mentioned later here.
- the thickness of the thermoplastic liquid crystal polymer film can be adjusted not only by adjusting the thickness of the raw film, but also by adjusting the draw ratio, for example, it has been difficult to produce conventionally, It is possible to efficiently produce a film having a thickness of less than 50 ⁇ m.
- the thickness of the thermoplastic liquid crystal polymer film may be 40 ⁇ m or less, and preferably 30 ⁇ m or less.
- the lower limit of the thickness of the thermoplastic liquid crystal polymer film can be set as necessary, but may be about 5 ⁇ m.
- the width in the TD direction of the stretched film is, for example, about 0.2 to 1.5 m. It may be about 0.5 to 1.2 m.
- the melting point of the thermoplastic liquid crystal polymer film after stretching may be, for example, about 300 to 350 ° C., and preferably about 320 to 340 ° C.
- the film was obtained by observing the thermal behavior of the film using a differential scanning calorimeter. In other words, the sample film was heated at a rate of 20 ° C./min to be completely melted, and then the melt was rapidly cooled to 50 ° C. at a rate of 50 ° C./min, and again raised at a rate of 20 ° C./min. The position of the endothermic peak that appeared when the film was recorded was recorded as the melting point of the film.
- thermomechanical analyzer TMA
- a tensile load of 1 g was applied to both ends of a film having a width of 5 mm and a length of 20 mm, and the temperature was increased from room temperature at a rate of 5 ° C./min until the film was broken. This is the temperature at which sudden expansion (elongation) has occurred, and the temperature at the intersection of the tangent line of the high temperature side base line and the low temperature side base line in the temperature to deformation curve is defined as the heat deformation temperature.
- the film thickness is measured using a digital thickness meter (manufactured by Mitutoyo Corporation) at a 1 cm interval in the TD direction, and the average value of 10 points arbitrarily selected from the center and the end is taken as the average film thickness. did.
- the thickness unevenness R is a measurement value of 30 points obtained by measuring the thickness of the center and both ends in the TD direction of the film 10 times per 1 m in the longitudinal direction at an arbitrary position of the roll-shaped film.
- both ends means the position of the distance of 10% of full width toward the center from the both ends of the film along the TD direction.
- Example 1 A thermoplastic liquid crystal polymer having a melting point of 280 ° C., which is a copolymer of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (molar ratio: 73/27), is heated and kneaded with a single screw extruder to obtain a die diameter. It was melt-extruded at a die shear rate of 500 seconds -1 from an annular inflation die having a die slit interval of 33.5 mm and a longitudinal draw ratio (Dr) of 2.9 and a transverse draw ratio (Bl) of 6.2. A film having a melting point of 280 ° C. and a film thickness of 100 ⁇ m was obtained. The film had a heat distortion temperature of 260 ° C.
- thermoplastic liquid crystal polymer film and an aluminum foil having a thickness of 50 ⁇ m are heated at 260 ° C. under a pressure of 10 kg /
- the laminated body of the structure of a thermoplastic liquid crystal polymer film / aluminum foil was produced by pressure bonding at cm 2 and a speed of 3 m / min, and this laminated body was placed in a hot-air circulating heat treatment furnace controlled at 280 ° C. for 30 seconds.
- this film was stretched by a biaxial stretching machine at a stretching temperature of 300 ° C., a stretching ratio of 2 times in the MD direction, 2.5 times in the TD direction, and a stretching speed of 25% / second, and a liquid crystal polymer film having a thickness of 20 ⁇ m (melting point) 335 ° C.).
- the thickness tolerance of this film was 1.5 ⁇ m (thickness unevenness 3.75%).
- thermoplastic liquid crystal polymer having a melting point of 280 ° C. which is a copolymer of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (molar ratio: 73/27), is heated and kneaded with a single screw extruder to obtain a die diameter. It was melt-extruded at a die shear rate of 1000 seconds ⁇ 1 from an annular inflation die having a die slit interval of 400 ⁇ m and a longitudinal draw ratio (Dr) of 2.9 and a transverse draw ratio (Bl) of 6.2. A film having a melting point of 280 ° C. and a film thickness of 20 ⁇ m was obtained. The film had a heat distortion temperature of 260 ° C.
- thermoplastic liquid crystal polymer film and an aluminum foil having a thickness of 50 ⁇ m are heated at 260 ° C. under a pressure of 10 kg /
- the laminated body of the structure of a thermoplastic liquid crystal polymer film / aluminum foil was produced by pressure bonding at cm 2 and a speed of 3 m / min, and this laminated body was placed in a hot-air circulating heat treatment furnace controlled at 280 ° C. for 30 seconds.
- thermoplastic liquid crystal polymer having a melting point of 280 ° C. which is a copolymer of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (molar ratio: 73/27), is heated and kneaded with a single screw extruder to obtain a die diameter. It was melt-extruded at a die shear rate of 500 seconds -1 from an annular inflation die having a die slit interval of 33.5 mm and a longitudinal draw ratio (Dr) of 2.9 and a transverse draw ratio (Bl) of 6.2. A film having a melting point of 280 ° C. and a film thickness of 100 ⁇ m was obtained. The film had a heat distortion temperature of 260 ° C.
- thermoplastic liquid crystal polymer film and an aluminum foil having a thickness of 50 ⁇ m are heated at 260 ° C. under a pressure of 10 kg /
- the laminated body of the structure of a thermoplastic liquid crystal polymer film / aluminum foil was produced by pressure bonding at cm 2 and a speed of 3 m / min, and this laminated body was placed in a hot-air circulating heat treatment furnace controlled at 280 ° C. for 30 seconds.
- thermoplastic liquid crystal polymer having a melting point of 280 ° C. which is a copolymer of p-hydroxybenzoic acid and 6-hydroxy-2-naphthoic acid (molar ratio: 73/27), is heated and kneaded with a single screw extruder to obtain a die diameter. It was melt-extruded at a die shear rate of 500 seconds -1 from an annular inflation die having a die slit interval of 33.5 mm and a longitudinal draw ratio (Dr) of 2.9 and a transverse draw ratio (Bl) of 6.2. A film having a melting point of 280 ° C. and a film thickness of 100 ⁇ m was obtained.
- Dr longitudinal draw ratio
- Bl transverse draw ratio
- the film had a heat distortion temperature of 260 ° C. This film had a dielectric constant in the MD direction of 3.34 and a dielectric constant in the TD direction of 3.27. Next, an attempt was made to stretch the film, but the film broke and could not be stretched.
- thermoplastic liquid crystal polymer film of the present invention can be used as a substrate material for various electric and electronic products. Further, according to the production method of the present invention, a thermoplastic liquid crystal polymer film with reduced thickness unevenness can be efficiently produced in a wide range of thicknesses.
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Abstract
Description
また、液晶ポリマーは、剛直なメソゲン基の配向により、メソゲン基同士が互いに絡み合わず滑るように流れるため、液晶ポリマーのみかけの溶融粘度が低剪断速度領域で急激に低下してしまう。そのため、延伸を行うために融点近くまで温度を上げると、急激にポリマーの流動性が高まってしまい、フィルム単独で延伸を行うことが不可能である。
を少なくとも備える熱可塑性液晶ポリマーフィルムの製造方法である。この延伸工程では、支持体を利用せずにフィルム単独を延伸してもよい。
熱可塑性液晶ポリマーからなる原反フィルムと、金属箔などの支持体とを接合させて積層体を得る積層工程と、
前記積層体を熱処理して、熱処理後の熱可塑性液晶ポリマーフィルムの誘電率が、MD方向およびTD方向ともに、3.25以下となるように調整する誘電率調整工程と、
前記誘電率が調整されたフィルムと支持体とを分離する分離工程と、を備えていてもよい。
また、延伸工程における加熱温度は、延伸されるフィルムの熱変形温度(Td)から40℃低い温度(Td-40℃)~Tdから10℃低い温度(Td-10℃)の範囲内であるのが好ましい。
を少なくとも備えている。
本発明の熱可塑性液晶ポリマーフィルム(またはサーモトロピック液晶ポリマーフィルム)は、溶融成形できる液晶性ポリマー(または光学的に異方性の溶融相を形成し得るポリマー)で構成され、この熱可塑性液晶ポリマーは、溶融成形できる液晶性ポリマーであれば特にその化学的構成については特に限定されるものではないが、例えば、熱可塑性液晶ポリエステル、又はこれにアミド結合が導入された熱可塑性液晶ポリエステルアミドなどを挙げることができる。
本発明に使用される熱可塑性液晶ポリマーからなる原反フィルムは、熱可塑性液晶ポリマーを押出成形して得られる。熱可塑性液晶ポリマーの剛直な棒状分子の方向を制御できる限り、任意の押出成形法が適用できるが、周知のTダイ法、ラミネート体延伸法、インフレーション法などが工業的に有利である。特にインフレーション法やラミネート体延伸法では、フィルムの機械軸方向(以下、MD方向と略す)だけでなく、これと直交する方向(以下、TD方向と略す)にも応力が加えられ、MD方向とTD方向における誘電特性を制御したフィルムが得られる。
誘電率調整工程では、前記積層体を熱処理して、前記熱処理後のフィルムが、TD方向およびMD方向の双方において、特定の誘電率を有するように調整する。例えば、この工程では、積層体を、加熱処理装置に対して連続的に送り込み、例えば、原反フィルムの融点(Tm)より15℃低い温度(Tm-15)℃から、融点より30℃高い温度(Tm+30)℃の範囲内で加熱処理を行う。
1回目:熱処理温度がフィルムの熱変形温度Tdから、該フィルムの熱処理前の融点Tmよりα℃低い温度までの温度範囲(Td~(Tm-α℃))で、前記フィルムの融解ピーク温度TAが、該フィルムの熱処理前の融点Tmよりβ℃高い温度TA1 に到達するまで熱処理を行う。ここで、α=5~35、β=5~30;
2回目:熱処理温度が前記フィルムの熱処理前の融点Tm以上で融解ピーク温度TA1未満の温度範囲で、さらに前記融解ピーク温度TA1がγ℃増大する温度TA2に到達するまで熱処理を行う。ここで、γ=5~20;
n回目:熱処理温度が融解ピーク温度TAn-2以上でTAn-1未満の温度範囲で、TAn-1がγ℃増大する温度TAn に到達するまで熱処理を行う。ここで、整数n≧3、γ=5~20。
フィルムを形成する液晶ポリマーの分子量が増加した後、フィルムは支持体から分離される。分離手段としては、支持体のエッチングによる分離や、フィルムと支持体との物理的な剥離などが挙げられる。
支持体から分離されたフィルム、または準備工程により準備された熱可塑性液晶ポリマーからなるフィルムは、MD方向およびTD方向ともに3.25以下の誘電率を有している。
そして、延伸処理を行うための被処理フィルムの熱変形温度(Td)から60℃低い温度(Td-60℃)~Tdから5℃低い温度(Td-5℃)の範囲内で、前記被処理フィルムは、加熱して延伸される。好ましくは、前記加熱温度は、分離されたフィルムの熱変形温度(Td)から40℃低い温度(Td-40℃)~Tdから10℃低い温度(Td-10℃)の範囲内であってもよい。
延伸方法自体は公知であり、二軸延伸、一軸延伸のいずれを採用してもよいが、分子配向度を制御することがより容易であることから、二軸延伸が好ましい。また、延伸は、公知の一軸延伸機、同時二軸延伸機、逐次二軸延伸機などが使用できる。
このような延伸工程を経て、本発明の熱可塑性液晶ポリマーフィルムを得ることが可能となる。
このようにして得られた本発明の熱可塑性液晶ポリマーフィルムは、支持体を用いることなく低温での延伸が可能となるため、厚みムラの少ないフィルムとなる。例えば、熱可塑性液晶ポリマーフィルムは、厚みムラが10%以下であってもよく、好ましくは7%以下、より好ましくは5%以下であってもよい。なお、ここで厚みムラとは、後述する実施例に記載した方法により測定される値である。
示差走査熱量計を用いて、フィルムの熱挙動を観察して得た。つまり、供試フィルムを20℃/分の速度で昇温して完全に溶融させた後、溶融物を50℃/分の速度で50℃まで急冷し、再び20℃/分の速度で昇温した時に現れる吸熱ピークの位置を、フィルムの融点として記録した。
熱機械分析装置(TMA)を用いて、幅5mm、長さ20mmのフィルムの両端に1gの引張荷重をかけ、室温から5℃/分の速度で、フィルムが破断するまで昇温したときの、急激な膨張(伸び)が発生した温度であり、温度~変形曲線における高温側のベースラインの接線と低温側のベースラインの接線の交点の温度を熱変形温度とする。
膜厚は、デジタル厚み計(株式会社ミツトヨ製)を用い、選られたフィルムをTD方向に1cm間隔で測定し、中心部および端部から任意に選んだ10点の平均値を平均フィルム厚みとした。また、厚みムラRは、フィルムのTD方向において、中心部と両端部の厚みを、ロール状のフィルムの任意の位置において、長手方向に1m毎に10回測定して得られる30点の計測値の最大値をLmax、最小値をLmin、平均値をLaとしたときに、
R=(Lmax-Lmin)/2La×100
で表した。なお、両端部とは、TD方向に沿ったフィルムの両末端から中心に向かって全幅の10%の距離の位置のことをいう。
王子計測機器(株)製分子配向計「MOA6015」を用いて、採取した各サンプルについて、室温(25℃)において、MD方向、TD方向の15GHzでの誘電率を測定した。
p-ヒドロキシ安息香酸と6-ヒドロキシ-2-ナフトエ酸の共重合物(モル比:73/27)で、融点が280℃である熱可塑性液晶ポリマーを単軸押出機で加熱混練し、ダイ直径33.5mm、ダイスリット間隔1mmの環状インフレーションダイから、ダイ剪断速度500秒-1で溶融押出して、縦の延伸比(Dr)2.9、横の延伸比(Bl)6.2の条件で、融点280℃、膜厚100μmのフィルムを得た。上記フィルムの熱変形温度は260℃であった。
p-ヒドロキシ安息香酸と6-ヒドロキシ-2-ナフトエ酸の共重合物(モル比:73/27)で、融点が280℃である熱可塑性液晶ポリマーを単軸押出機で加熱混練し、ダイ直径33.5mm、ダイスリット間隔400μmの環状インフレーションダイから、ダイ剪断速度1000秒-1で溶融押出して、縦の延伸比(Dr)2.9、横の延伸比(Bl)6.2の条件で、融点280℃、膜厚20μmのフィルムを得た。上記フィルムの熱変形温度は260℃であった。
p-ヒドロキシ安息香酸と6-ヒドロキシ-2-ナフトエ酸の共重合物(モル比:73/27)で、融点が280℃である熱可塑性液晶ポリマーを単軸押出機で加熱混練し、ダイ直径33.5mm、ダイスリット間隔1mmの環状インフレーションダイから、ダイ剪断速度500秒-1で溶融押出して、縦の延伸比(Dr)2.9、横の延伸比(Bl)6.2の条件で、融点280℃、膜厚100μmのフィルムを得た。上記フィルムの熱変形温度は260℃であった。
次に、このフィルムを延伸温度350℃で二軸延伸を試みたが、フィルムが溶融し、延伸が不可能であった。
p-ヒドロキシ安息香酸と6-ヒドロキシ-2-ナフトエ酸の共重合物(モル比:73/27)で、融点が280℃である熱可塑性液晶ポリマーを単軸押出機で加熱混練し、ダイ直径33.5mm、ダイスリット間隔1mmの環状インフレーションダイから、ダイ剪断速度500秒-1で溶融押出して、縦の延伸比(Dr)2.9、横の延伸比(Bl)6.2の条件で、融点280℃、膜厚100μmのフィルムを得た。上記フィルムの熱変形温度は260℃であった。このフィルムのMD方向の誘電率は3.34、TD方向の誘電率は3.27であった。
次に、このフィルムの延伸を試みたが、破断してしまい、延伸は不可能であった。
Claims (9)
- MD方向およびTD方向ともに3.25以下の誘電率を有する、光学的異方性の溶融相を形成し得る熱可塑性ポリマー(以下、これを熱可塑性液晶ポリマーと称する)からなるフィルムを準備する準備工程、および
フィルムの熱変形温度(Td)から60℃低い温度(Td-60℃)~Tdから5℃低い温度(Td-5℃)の範囲内で、前記フィルムを加熱して延伸する延伸工程、
を少なくとも備える熱可塑性液晶ポリマーフィルムの製造方法。 - 請求項1において、延伸工程で、支持体を利用せずにフィルム単独を延伸する熱可塑性液晶ポリマーフィルムの製造方法。
- 請求項1または2において、延伸工程に先立って、
熱可塑性液晶ポリマーからなる原反フィルムと、支持体とを接合させて積層体を得る積層工程と、
前記積層体を熱処理して、熱処理後の熱可塑性液晶ポリマーフィルムの誘電率が、MD方向およびTD方向ともに、3.25以下となるように調整する誘電率調整工程と、
前記誘電率が調整されたフィルムと支持体とを分離する分離工程と、を備えている熱可塑性液晶ポリマーフィルムの製造方法。 - 請求項3において、誘電率調整工程において、熱処理後のフィルムの熱変形温度を、原反フィルムの熱変形温度より40~100℃上昇させる熱可塑性液晶ポリマーフィルムの製造方法。
- 請求項1から4のいずれか一項において、延伸工程における加熱温度が、延伸されるフィルムの熱変形温度(Td)から40℃低い温度(Td-40℃)~Tdから10℃低い温度(Td-10℃)の範囲内である、熱可塑性液晶ポリマーフィルムの製造方法。
- 請求項3から5のいずれか一項において、支持体が金属箔からなる、熱可塑性液晶ポリマーフィルムの製造方法。
- 請求項1~6のいずれか一項に記載された方法により製造された熱可塑性液晶ポリマーフィルム。
- 請求項7において、厚みムラが10%以下である熱可塑性液晶ポリマーフィルム。
- 請求項7または8において、TD方向の幅が、0.2~1.2mの範囲である熱可塑性液晶ポリマーフィルム。
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JP2007320088A (ja) * | 2006-05-30 | 2007-12-13 | Nof Corp | プリプレグ及びプリント配線板用金属張り基板 |
CN101235201B (zh) * | 2008-02-02 | 2011-08-10 | 上海市合成树脂研究所 | 聚酰亚胺纳米复合薄膜的制备方法 |
JP6133782B2 (ja) * | 2011-10-31 | 2017-05-24 | 株式会社クラレ | 熱可塑性液晶ポリマーフィルムならびにこれを用いた積層体および回路基板 |
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2013
- 2013-03-08 CN CN201380017961.7A patent/CN104220236A/zh active Pending
- 2013-03-08 WO PCT/JP2013/056387 patent/WO2013146174A1/ja active Application Filing
- 2013-03-08 EP EP13769770.2A patent/EP2832525A4/en not_active Withdrawn
- 2013-03-08 KR KR20147030055A patent/KR20150001770A/ko not_active Application Discontinuation
- 2013-03-08 JP JP2014507607A patent/JPWO2013146174A1/ja active Pending
- 2013-03-28 TW TW102111064A patent/TW201343369A/zh unknown
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2014
- 2014-09-29 US US14/500,306 patent/US20150017413A1/en not_active Abandoned
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2020095988A1 (ja) * | 2018-11-08 | 2020-05-14 | 株式会社クラレ | 熱可塑性液晶ポリマーフィルムおよびそれを用いた回路基板 |
JP6764049B1 (ja) * | 2018-11-08 | 2020-09-30 | 株式会社クラレ | 熱可塑性液晶ポリマーフィルムおよびそれを用いた回路基板 |
US11877395B2 (en) | 2018-11-08 | 2024-01-16 | Kuraray Co., Ltd. | Thermoplastic liquid crystal polymer film and circuit board using same |
JP7526622B2 (ja) | 2018-11-08 | 2024-08-01 | 株式会社クラレ | 熱可塑性液晶ポリマーフィルムの製造方法、熱可塑性液晶ポリマーフィルム、並びにそれを用いた金属張積層体および回路基板 |
US11879041B2 (en) | 2019-02-15 | 2024-01-23 | Sumitomo Chemical Company, Limited | Film and laminate |
WO2024162372A1 (ja) * | 2023-02-03 | 2024-08-08 | 東洋鋼鈑株式会社 | 液晶ポリマーフィルム延伸用3層フィルム、延伸3層フィルム、および延伸液晶ポリマーフィルム、ならびにこれらの製造方法 |
Also Published As
Publication number | Publication date |
---|---|
US20150017413A1 (en) | 2015-01-15 |
WO2013146174A8 (ja) | 2014-10-16 |
CN104220236A (zh) | 2014-12-17 |
EP2832525A1 (en) | 2015-02-04 |
EP2832525A4 (en) | 2015-11-25 |
TW201343369A (zh) | 2013-11-01 |
JPWO2013146174A1 (ja) | 2015-12-10 |
KR20150001770A (ko) | 2015-01-06 |
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