JP2007277474A - Liquid carrier film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved liquid carrier film maintaining high carrying characteristics especially to a liquid having high polarity not only in an initial time but also under a use environment. <P>SOLUTION: The liquid carrier film has many fine grooves for controlling the flow direction of a liquid, formed on the main surface of a base material, and the base material comprises a mixture containing (A) a polyolefin resin and (B) a polymer having a polyoxyethylene chain. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a liquid transport film that transports while controlling the flow direction of liquid.

  Liquid transport film is useful for transporting various liquids such as blood, body fluid, urine, alcohol, water, ink, etc., for medical use such as surgery, dental treatment, specimen testing, food trays, diapers, It is known to use this liquid transport film for an inkjet printer head or the like (for example, see Patent Document 1 and Patent Document 2).

  In this liquid transport film, a plurality of grooves capable of spontaneously transporting the liquid in the axial direction are provided on the main surface, and the liquid is transported from one site to another along the groove. . In the conventional liquid transport film, a material in which a surfactant is kneaded into a polyolefin material is mainly used. The polyolefin material is excellent in chemical resistance and water resistance, is inexpensive, is flexible and has high workability, and is useful as a substrate for a liquid transport film. In addition, the surfactant has an effect of increasing the surface energy in order to transport a liquid having a particularly high polarity on the surface of the polyolefin film.

  However, in the liquid transport film using the conventional surfactant, a desired liquid transport property can be obtained in the initial stage, but in the continuous use or the application that keeps in contact with the liquid, the transport property of the liquid having a high polarity is deteriorated. Observed. The reason for this is thought to be that the surfactant is merely kneaded and does not form a strong bond (for example, a covalent bond) with the polyolefin material, but dissolves into the transported liquid. . Further, when the surfactant gradually elutes in the liquid as described above, the liquid to be transported or a member in contact with the liquid may be altered. For example, in the medical field, certain surfactants are known to destroy blood cells, limiting the use of liquid transport films in analyte testing applications. Also, in the ink jet printer field, when used for the inner surface of an ink tank or a head peripheral member, the surfactant may move to the ink or a member to be contacted to change the surface tension, thereby changing the printing characteristics.

  Therefore, in these fields, use of a high molecular weight hydrophilic resin as a substitute for the surfactant is required. However, since a general hydrophilic resin has poor compatibility with a polyolefin material, there is a problem that the mechanical strength and transparency of the polyolefin material are lowered when kneaded. In particular, in the field of medical specimens, transparency is an important factor because it is necessary to detect by optical action through a liquid transport film that forms a microchannel.

JP 2002-535039 A Special table 2003-503715 gazette

  The present invention provides a highly transparent liquid transport film that maintains high transport characteristics for a highly polar liquid, not only in the initial stage but also in the environment of use, without using a surfactant. Objective.

In order to achieve the above object, according to the present invention, in the liquid transport film having a plurality of fine grooves for controlling the flow direction of the liquid on the main surface,
A) polyolefin resin, and
B) It is characterized by comprising a mixture containing a polymer having a polyoxyethylene chain.

  The liquid transport film of the present invention exhibits high liquid transport capability without reducing the transparency and mechanical strength of the polyolefin material by adding a polymer having a polyoxyethylene chain to the polyolefin material instead of the surfactant. To do.

  The liquid transport film of the present invention is provided with a plurality of fine grooves for controlling the flow direction of the liquid on the main surface of the base material, and the base material comprises A) a polyolefin resin, and B) a polymer having a polyoxyethylene chain. It consists of the mixture which contains.

  Polyolefin resin A) constituting the main component of the base material is useful as a base material for liquid transport film because it has high chemical resistance and water resistance, is inexpensive, is flexible and has excellent processability. . Examples of the polyolefin resin include polyethylene, polypropylene, propylene-ethylene copolymer, polybutene, and polymethylpentene-1. Of these, polyethylene and polypropylene are particularly preferred in view of processability and mechanical properties.

  In addition, the polyolefin resin preferably has a melt flow rate (MFR) of 1 to 500 in consideration of processability. If the MFR is lower than 1, the processing accuracy is lowered and it may be difficult to reduce the thickness. Moreover, when MFR is higher than 500, there exists a possibility that the mechanical strength of a film may fall. The MFR is a value measured according to JIS K67581 (in the case of polypropylene, the load is 2.16 kgf at 230 ° C., and in the case of polyethylene, the load is 2.16 kgf at 190 ° C.).

  Furthermore, in order to improve flexibility and adhesiveness as long as this polyolefin resin does not affect the properties as a liquid transport film, during polymerization of monomers such as ethylene and propylene, carboxylic acid, hydroxyl group, amino group, etc. It may be copolymerized with a hydrophilic monomer, an acrylate ester or the like.

  Polymer B) having a polyoxyethylene chain is added to the polyolefin resin A) as a means for imparting hydrophilicity. As the polymer B) having a polyoxyethylene chain, a polyether ester amide (B1), a polyolefin (a) and a block of the polymer (b) having a polyoxyethylene chain are ester bonds, amide bonds, ether bonds and Block copolymer (B2), polyether amide imide (B3), epihalohydrin / alkylene oxide copolymer (B4), polyether ester having a structure in which they are alternately and repeatedly bonded through at least one bond selected from the group consisting of imide bonds Examples thereof include those selected from the group consisting of (B5), methoxypolyethylene glycol (meth) acrylate copolymer (B6), polyether group-containing ethylene / vinyl acetate copolymer (B7), and a mixture of two or more thereof.

  Examples of the polyether ester amide (B1) include polyether ester amides described in JP-A-6-287547 and JP-B-4-5691. Of these, polyamide (B11) having a number average molecular weight (Mn) of 200 to 5,000 and bisphenol having a Mn of 300 to 5,000 measured by GPC (gel permeation chromatography) method are preferable from the viewpoint of heat resistance. It is a polyether ester amide derived from an alkylene oxide adduct (B12) of a compound.

  Examples of the polyamide (B11) include (1) lactam ring-opening polymers, (2) polycondensates of aminocarboxylic acids, and (3) polycondensates of dicarboxylic acids and diamines. Among the amide-forming monomers that form these polyamides, the lactam in (1) includes lactams having 6 to 12 carbon atoms, such as caprolactam, enantolactam, laurolactam, and undecanolactam. As the aminocarboxylic acid in (2), an aminocarboxylic acid having 6 to 12 carbon atoms such as ω-aminocaproic acid, ω-aminoenanthic acid, ω-aminocaprylic acid, ω-aminopergonic acid, ω-aminocapric acid, 11 -Aminoundecanoic acid and 12-aminododecanoic acid are mentioned. Examples of the dicarboxylic acid in (3) include aliphatic dicarboxylic acids, aromatic (aliphatic) dicarboxylic acids, alicyclic dicarboxylic acids, and amide-forming derivatives thereof (for example, acid anhydrides and lower (1 to 4 carbon atoms) alkyl esters. And mixtures of two or more thereof.

  Examples of the aliphatic dicarboxylic acid include 4 to 20 carbon atoms such as succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid, sebacic acid, undecanedioic acid, dodecanedioic acid, maleic acid, fumaric acid, and itacone. An acid etc. are mentioned. Examples of the aromatic (aliphatic) dicarboxylic acid include 8 to 20 carbon atoms, such as ortho-, iso- and terephthalic acid, naphthalene-2,6- and -2,7-dicarboxylic acid, diphenyl-4,4'dicarboxylic acid, Examples include alkali metal (sodium, potassium, etc.) salts of diphenoxyethanedicarboxylic acid and 3-sulfoisophthalic acid. Examples of the alicyclic dicarboxylic acid include those having 7 to 14 carbon atoms, such as cyclopropanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, cyclohexenedicarboxylic acid, dicyclohexyl-4,4-dicarboxylic acid, and the like.

  Among the amide-forming derivatives, examples of the acid anhydride include anhydrides of the above dicarboxylic acids, such as maleic anhydride, itaconic anhydride, phthalic anhydride, and the like. Examples include lower alkyl esters of acids such as dimethyl adipate, ortho-, iso- and dimethyl terephthalate. Examples of the diamine include 6 to 12 carbon atoms such as hexamethylene diamine, heptamethylene diamine, octamethylene diamine, and decamethylene diamine.

  Two or more of those exemplified as the amide-forming monomer may be used in combination. Among these, caprolactam, 12-aminododecanoic acid and adipic acid / hexamethylenediamine are preferable from the viewpoint of imparting hydrophilicity, and caprolactam is particularly preferable.

  The polyamide (B11) is obtained by using one or more dicarboxylic acids having 4 to 20 carbon atoms as a molecular weight regulator and subjecting the amide-forming monomer to ring-opening polymerization or polycondensation in the presence thereof in the usual manner. Examples of the dicarboxylic acid having 4 to 20 carbon atoms include those exemplified in the above (3). Among these, aliphatic dicarboxylic acid, aromatic dicarboxylic acid and 3-sulfo are preferred from the viewpoint of imparting hydrophilicity. Isophthalic acid alkali metal salts are more preferred, with adipic acid, sebacic acid, terephthalic acid, isophthalic acid and sodium 3-sulfoisophthalate.

  The amount of the molecular weight modifier used is preferably 2 to 80 wt%, more preferably 4 to 75 wt% from the viewpoints of hydrophilicity and heat resistance based on the total mass of the amide-forming monomer and the molecular weight modifier.

  Mn of the polyamide (B11) is preferably 200 to 5,000, more preferably 500 to 3,000, from the viewpoint of reactivity and heat resistance of the resulting polyether ester amide (b1).

  Examples of the bisphenol compound constituting the alkylene oxide adduct (B12) of the bisphenol compound in the present invention include 13 to 20 carbon atoms such as bisphenol A, bisphenol F, and bisphenol S. Among these, preferred from the viewpoint of dispersibility. Is bisphenol A.

  Moreover, as alkylene oxide added to a bisphenol compound, it is C2-C12, for example, ethylene oxide, propylene oxide, 1,2-, 2,3- and 1,4-butylene oxide, C5-C12 alpha olefin. Epoxides, styrene oxide and epihalohydrin (such as epichlorohydrin and epibromohydrin) and mixtures of two or more thereof. Among these, ethylene oxide is preferable from the viewpoint of imparting hydrophilicity.

  Mn of the alkylene oxide adduct (B12) of the bisphenol compound is preferably 300 to 5,000, more preferably 500 to 4,000 from the viewpoint of imparting hydrophilicity.

  The ratio of (B12) based on the total mass of polyamide (B11) and alkylene oxide adduct (B12) is preferably 20 to 80 wt% from the viewpoint of imparting hydrophilicity and heat resistance of polyetheresteramide (B1). More preferably, it is 30 to 70 wt%.

Specific examples of the method for producing the polyetheresteramide (B1) include the following production methods (1) and (2), but are not particularly limited.
Production method (1): A polyamide (B11) is formed by reacting an amide-forming monomer and a dicarboxylic acid (molecular weight modifier), an alkylene oxide adduct (B12) is added thereto, and a high temperature (160 to 270 ° C.). A method of performing a polymerization reaction under reduced pressure (0.03 to 3 kPa).
Production method (2): An amide-forming monomer, a dicarboxylic acid (molecular weight modifier) and an alkylene oxide adduct (B12) are simultaneously charged into a reaction vessel at a high temperature (160 to 270 ° C) in the presence or absence of water. A method in which an intermediate polyamide (B11) is produced by a pressure (0.1 to 1 MPa) reaction, followed by a polymerization reaction with an alkylene oxide adduct (B12) under reduced pressure (0.03 to 3 kPa).
Of the above production methods, production method (1) is preferred from the viewpoint of reaction control.

  In addition to the above, the polyether ester amide (B1) is produced by replacing the terminal hydroxyl group of the alkylene oxide adduct (B12) with an amino group or a carboxyl group, and reacting with a polyamide having a carboxyl group or an amino group at the terminal. A method may be used. As a method for replacing the terminal hydroxyl group of the alkylene oxide adduct (B12) with an amino group, a known method, for example, a method in which a terminal cyanoalkyl group obtained by cyanoalkylating a hydroxyl group is reduced to an amino group (for example, alkylene And a method in which an oxido adduct (B12) and acrylonitrile are reacted and the resulting cyanoethylated product is hydrogenated). Examples of the method for replacing the terminal hydroxyl group of the alkylene oxide adduct (B12) with a carboxyl group include a method of oxidizing with an oxidizing agent (for example, a method of oxidizing the hydroxyl group of the alkylene oxide adduct (B12) with chromic acid) and the like. .

  In the above polymerization reaction, a commonly used known esterification catalyst is used. This catalyst includes antimony catalysts (such as antimony trioxide), tin catalysts (such as monobutyltin oxide), titanium catalysts (such as tetrabutyl titanate), zirconium catalysts (such as tetrabutylzirconate), metal acetate catalysts (such as zinc acetate, And zirconyl acetate). The amount of the catalyst used is preferably 0.1 to 5 wt% based on the total mass of the polyether ester amide (B11) and the alkylene oxide adduct (B12), more preferably 0.2 to 3 wt% from the viewpoint of reactivity and resin properties. It is.

Reduced viscosity of polyether ester amide (B1) [η _SP / C, C = 0.5 wt% (m-cresol solution, 25 ° C.), value measured using Ubbelohde 1A viscometer, unit is dl / g, below the same. ] Is preferably from 0.5 to 4, more preferably from 0.6 to 3, from the viewpoint of the heat resistance of the polyetheresteramide (B1) and the moldability of the resin composition. In the following, the reduced viscosity is indicated only by a numerical value.

  As the block polymer (B2), the block polymers described in WO00 / 47652 can be used. As the block of the polyolefin (a), a polyolefin (a21) having a carbonyl group (preferably a carboxyl group), a hydroxyl group and an amino group at both ends of the polymer can be used.

  As the polyolefin (a21), both polyolefins (a20) having a polyolefin whose both ends can be modified preferably as a main component (content of 50 wt% or more, more preferably 75 wt% or more, particularly preferably 80 to 100 wt%) are used. Examples thereof include those having a carbonyl group introduced at the terminal. Polyolefin (a20) is usually a mixture of a polyolefin that can be modified at both ends, a polyolefin that can be modified at one end, and a polyolefin that does not have a terminal end group that can be modified. Some are preferred.

  The polyolefin (a20) is a polyolefin obtained by (co) polymerization (meaning polymerization or copolymerization; the same applies hereinafter) of one or a mixture of two or more olefins having 2 to 30 carbon atoms [obtained by polymerization method. And low molecular weight polyolefins obtained by thermal degradation of high molecular weight polyolefins (polyolefins obtained by polymerization of olefins having 2 to 30 carbon atoms) can be used.

  Examples of the olefin having 2 to 30 carbon atoms include ethylene, propylene, α-olefin having 4 to 30 carbon atoms (preferably 4 to 12 and more preferably 4 to 10), and 4 to 30 carbon atoms (preferably 4 to 18). More preferably, 4-8) dienes and the like can be mentioned. Examples of the α-olefin having 4 to 30 carbon atoms include 1-butene, 4-methyl-1-pentene, 1-pentene, 1-octene, 1-decene and 1-dodecene. Examples of the diene include butadiene, Examples include isoprene, cyclopentadiene and 1,11-dodecadiene. Of these, preferred are olefins having 2 to 12 carbon atoms (ethylene, propylene, α-olefins having 4 to 12 carbon atoms, butadiene and / or isoprene, etc.), and more preferred are olefins having 2 to 10 carbon atoms (ethylene). , Propylene, α-olefins having 4 to 10 carbon atoms, and / or butadiene, etc.), particularly preferably ethylene, propylene and / or butadiene.

  The low molecular weight polyolefin obtained by the thermal degradation method can be easily obtained by, for example, the method described in JP-A-3-62804. The polyolefin obtained by the polymerization method can be produced by a known method, for example, easily obtained by (co) polymerizing the olefin in the presence of a radical catalyst, a metal oxide catalyst, a Ziegler catalyst, a Ziegler-Natta catalyst, or the like. be able to.

As the radical catalyst, known ones such as di-t-butyl peroxide, t-butyl benzoate, decanol peroxide, lauryl peroxide, peroxy-dicarbonate ester, azo compound, etc., and oxidized to γ-alumina carrier For example, molybdenum is attached. Examples of the metal oxide catalyst include those obtained by attaching chromium oxide to a silica-alumina support. Examples of Ziegler catalysts and Ziegler-Natta catalysts include (C ₂ H ₅ ) ₃ Al—TiCl ₄ . A low molecular weight polyolefin by a thermal degradation method is preferable from the viewpoint of easy introduction of a carbonyl group as a modifying group and availability.

  Mn of the polyolefin (a20) is preferably 800 to 20,000, more preferably 1,000 to 10,000, and particularly preferably 1,200 to 6,000 from the viewpoint of imparting hydrophilicity. The amount of double bonds in the polyolefin (a20) is preferably 1 to 40 per 1,000 carbon atoms, more preferably 2 to 30 and particularly preferably 4 to 20 from the viewpoint of imparting hydrophilicity. It is. The average number of double bonds per molecule is preferably 1.1 to 5, more preferably 1.3 to 3, particularly preferably 1.5 to 2.5 from the viewpoints of repetitive structure formation and hydrophilicity. Yes, most preferably 1.8-2.2. In the thermal degradation method, a low-molecular-weight polyolefin having an Mn in the range of 800 to 6,000 and an average number of terminal double bonds per molecule of 1.5 to 2 can be easily obtained [for example, Katsuhide Murata, Tadahiko Makino, Japan Chemical Society Journal, page 192 (1975)].

The measurement conditions of Mn are as follows (in the above and below, Mn is measured under the same conditions).
Apparatus: High-temperature gel permeation chromatography solvent: Orthodichlorobenzene reference material: Polystyrene sample concentration: 3 mg / ml
Column stationary phase: PLgel MIXED-B
Column temperature: 135 ° C

  As the polyolefin (a21) having a carbonyl group at both ends of the polymer, both ends of the polyolefin (b20) are α, β-unsaturated carboxylic acid (anhydride) (α, β-unsaturated carboxylic acid, its carbon number 1 A polyolefin (a211) having a structure modified with an alkyl ester of -4 or its anhydride, and the like (hereinafter the same)), a polyolefin having a structure obtained by secondary modification of this polyolefin (a211) with a lactam or an aminocarboxylic acid ( a212), polyolefin (a213) having a structure obtained by oxidation or hydroformylation modification of polyolefin (a20), polyolefin (a214) having a structure obtained by secondary modification of polyolefin (a213) with lactam or aminocarboxylic acid, and two or more thereof And the like.

  The polyolefin (a211) can be obtained by modifying the polyolefin (a20) with an α, β-unsaturated carboxylic acid (anhydride). Examples of the α, β-unsaturated carboxylic acid (anhydride) include carboxylic acids having 3 to 12 carbon atoms, such as monocarboxylic acids [(meth) acrylic acid and the like], dicarboxylic acids (maleic acid, fumaric acid, itaconic acid, citracone Acid, etc.), alkyl (1 to 4 carbon atoms) esters thereof [methyl (meth) acrylate, butyl (meth) acrylate, diethyl itaconate, etc.], and anhydrides thereof. Of these, preferred from the viewpoint of reactivity with the polyolefin (a20) are dicarboxylic acids, their alkyl esters and their anhydrides, more preferred are maleic acid (anhydride) and fumaric acid, especially Preferred is maleic acid (anhydride).

  The amount of α, β-unsaturated carboxylic acid (anhydride) used is preferably 0.5 to 40 wt%, more preferably from the viewpoint of the formation of a repeating structure and hydrophilicity, based on the mass of the polyolefin (a20). It is 1-30 wt%, Most preferably, it is 2-20 wt%. Modification of the polyolefin (a20) with an α, β-unsaturated carboxylic acid (anhydride) can be carried out by a known method, for example, by subjecting the terminal double bond of the polyolefin (a20) to either a solution method or a melt method. , Β-unsaturated carboxylic acid (anhydride) can be thermally added (ene reaction). As a solution method, α, β-unsaturated carboxylic acid (anhydride) is added to polyolefin (a20) in the presence of a hydrocarbon solvent such as xylene and toluene, and the temperature is 170 to 230 ° C. in an inert gas atmosphere such as nitrogen. And the like. Examples of the melting method include a method in which the polyolefin (a20) is heated and melted, and then an α, β-unsaturated carboxylic acid (anhydride) is added and reacted at 170 to 230 ° C. in an inert gas atmosphere such as nitrogen. Among these methods, the solution method is preferable from the viewpoint of reaction uniformity.

  Polyolefin (a212) can be obtained by secondary modification of polyolefin (a211) with lactam or aminocarboxylic acid. Examples of the lactam include lactams having 6 to 12 carbon atoms (preferably 6 to 8, more preferably 6), such as caprolactam, enantolactam, laurolactam, and undecanolactam. As the aminocarboxylic acid, an aminocarboxylic acid having 2 to 12 (preferably 4 to 12, more preferably 6 to 12) carbon atoms such as an amino acid (glycine, alanine, valine, leucine, isoleucine, phenylalanine, etc.), ω- Examples include aminocaproic acid, ω-aminoenanthic acid, ω-aminocaprylic acid, ω-aminopergonic acid, ω-aminocapric acid, 11-aminoundecanoic acid and 12-aminododecanoic acid. Of these, caprolactam, laurolactam, glycine, leucine, ω-aminocaprylic acid, 11-aminoundecanoic acid and 12-aminododecanoic acid are preferred from the viewpoint of reactivity of secondary modification, and caprolactam is more preferred. Laurolactam, ω-aminocaprylic acid, 11-aminoundecanoic acid, 12-aminododecanoic acid, particularly preferred are caprolactam and 12-aminododecanoic acid.

  The polyolefin (a213) can be obtained by introducing a carbonyl group by oxidizing the polyolefin (a20) with oxygen and / or ozone or hydroformylating by an oxo method. The introduction of the carbonyl group by oxidation can be carried out by a known method, for example, the method described in US Pat. No. 3,692,877. Introduction of a carbonyl group by hydroformylation can be performed by a known method, for example, the method described in Macromolecules, Vol. 31, page 5943.

  The polyolefin (a214) can be obtained by secondary modification of the polyolefin (a213) with lactam or aminocarboxylic acid. Examples of the lactam and aminocarboxylic acid include those exemplified for the alkylene oxide adduct (B12), and the amounts used are also the same.

  Mn of the polyolefin (a21) having carbonyl groups at both ends of the polymer is preferably 800 to 25,000, more preferably 1 from the viewpoint of heat resistance and reactivity with the hydrophilic polymer (b) described later. 20,000 to 20,000, particularly preferably 2,500 to 10,000. The acid value of the polyolefin (a21) is preferably 4 to 280 (mg KOH / g, hereinafter, only numerical values are described), more preferably from the viewpoint of reactivity with the hydrophilic polymer (b). It is 4-100, Most preferably, it is 5-50.

  Polyether diol (b1) and polyether diamine (b2) can be used as the polymer (b) having a polyoxyethylene chain.

The polyether diol (b1) has a structure obtained by addition reaction of an alkylene oxide (3 to 12 carbon atoms) containing ethylene oxide as an essential component to the diol (b01) or dihydric phenol (b02), for example, general _{^{formula: H (OA 1) m O}} -E 1 -O (A 1 O) m ' ones represented by H, and the like. In the formula, E ¹ represents a residue obtained by removing a hydroxyl group from the diol (b01) or dihydric phenol (b02), and A ¹ is an alkylene group having 2 carbon atoms which may contain a halogen atom. Represents an alkylene group having 2 to 12 carbon atoms (preferably 2 to 8, more preferably 2 to 4), and m and m ′ are integers of 1 to 300, preferably 2 to 250, particularly preferably 10 to 100. M and m ′ may be the same or different. Further, m (OA ¹ ) and m ′ (A ¹ O) may be the same or different, and these are composed of two or more oxyalkylene groups having ethylene oxide as an essential component. In this case, the combination type may be block, random, or a combination thereof.

  The diol (b01) includes a dihydric alcohol (aliphatic, alicyclic and araliphatic dihydric alcohol) having 2 to 12 carbon atoms (preferably 2 to 10, more preferably 2 to 8 carbon atoms) and 1 to 1 carbon atoms. 12 tertiary amino group-containing diols and the like. Examples of the aliphatic dihydric alcohol include ethylene glycol, propylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol and 1,12-dodecanediol. Examples of the alicyclic dihydric alcohol include 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-cyclooctanediol, and 1,3-cyclopentanediol. Examples of the araliphatic dihydric alcohol include xylylenediol, 1-phenyl-1,2-ethanediol, and 1,4-bis (hydroxyethyl) benzene.

  As the tertiary amino group-containing diol, an aliphatic or alicyclic primary monoamine (having 1 to 12 carbon atoms, preferably 2 to 10 carbon atoms, more preferably 2 to 8 carbon atoms) bishydroxyalkyl (1 to 1 carbon atoms in the alkyl group). 12, preferably 2 to 10, more preferably 2 to 8) and aromatic (aliphatic) primary monoamines (6 to 12 carbon atoms) bishydroxyalkyl (alkyl group having 1 to 12 carbon atoms) compounds. It is done. The bishydroxyalkylated product of monoamine can be obtained by a known method, for example, by reacting monoamine with alkylene oxide having 2 to 4 carbon atoms (ethylene oxide, propylene oxide, butylene oxide, etc.) or halogenating monoamine with 1 to 12 carbon atoms. It can be easily obtained by reacting with hydroxyalkyl (2-bromoethyl alcohol, 3-chloropropyl alcohol, etc.).

  Aliphatic primary monoamines include methylamine, ethylamine, 1- and 2-propylamine, n- and i-amylamine, hexylamine, 1,3-dimethylbutylamine, 3,3-dimethylbutylamine, 2- and 3- Examples include aminoheptane, heptylamine, nonylamine, decylamine, undecylamine, and dodecylamine. Examples of the alicyclic primary monoamine include cyclopropylamine, cyclopentylamine, cyclohexylamine and the like. Examples of the aromatic (aliphatic) primary monoamine include aniline and benzylamine.

  Examples of the dihydric phenol (b02) include 6 to 18 carbon atoms (preferably 8 to 18 and more preferably 10 to 15 phenol), such as monocyclic dihydric phenols (hydroquinone, catechol, resorcin, urushiol, etc.), bisphenol. (Bisphenol A, bisphenol F, bisphenol S, 4,4′-dihydroxydiphenyl-2,2-butane, dihydroxybiphenyl, etc.) and condensed polycyclic dihydric phenols (dihydroxynaphthalene, binaphthol, etc.) and the like.

  Of the diol (b01) and dihydric phenol (b02), dihydric alcohol and dihydric phenol are preferred from the viewpoint of hydrophilicity, more preferred are aliphatic dihydric alcohol and bisphenol, and particularly preferred are ethylene glycol and bisphenol. A.

  As the alkylene oxide to be added to the diol (b01) or the dihydric phenol (b02), other than ethylene oxide, alkylene oxide having 3 to 12 carbon atoms (propylene oxide, 1,2-, 1,4-, 2,3- And 1,3-butylene oxide and a mixture of two or more thereof), and other alkylene oxides and substituted alkylene oxides may be used in combination as necessary. Examples of other alkylene oxides and substituted alkylene oxides include epoxidized products of α-olefins having 5 to 12 carbon atoms, styrene oxide and epihalohydrins (such as epichlorohydrin and epibromohydrin). The amount of each of the other alkylene oxides and substituted alkylene oxides used is preferably 30 wt% or less, more preferably 0 or 25 wt%, particularly preferably from the viewpoint of imparting hydrophilicity based on the mass of the total alkylene oxide. Is 0 or 20 wt% or less.

  The number of added moles of alkylene oxide is preferably 1 to 300 mol per hydroxyl group of the diol (b01) or dihydric phenol (b02), more preferably from the viewpoint of the hydrophilicity of the polymer (b) having a polyoxyethylene chain. Is 2 to 250 mol, particularly preferably 10 to 100 mol. When two or more alkylene oxides are used in combination, the bond form may be random and / or block.

  The addition reaction of alkylene oxide can be performed by a known method, for example, in the presence of an alkali catalyst (potassium hydroxide, sodium hydroxide, etc.) under the conditions of 100 to 200 ° C. and pressure of 0 to 0.5 MPaG. The content of the oxyalkylene unit in the polyether diol (b1) is preferably 5 to 99.8 wt%, more preferably from the viewpoint of the hydrophilicity of the hydrophilic polymer (b) based on the mass of the polyether diol (b1). Is 8 to 99.6 wt%, particularly preferably 10 to 98 wt%. Further, the content of the oxyethylene unit in the polyoxyalkylene chain is preferably 5 to 100 wt% from the viewpoint of the hydrophilicity of the hydrophilic polymer (b) based on the mass of the polyoxyalkylene chain, more preferably 10 to 100 wt%, particularly preferably 50 to 100 wt%, most preferably 60 to 100 wt%.

The polyether diamine (b2) has a structure in which the hydroxyl group of the polyether diol (b1) is modified to an amino group (primary or secondary amino group), for example, a general formula: RNH-A ^2- (OA ¹ ) those represented by ^{_{m O-E 1 -O (A}} 1 O) m '-A 2 -NHR the like. Therefore, the content of oxyethylene units in the polyoxyalkylene chain is the same as in the polyether diol (b1), and the content of oxyalkylene units in the polyether diamine (b2) is the same in the corresponding polyether diol (b1). It is the same as the content of oxyalkylene units. The symbol E ¹ in the formula represents a residue obtained by removing a hydroxyl group from the diol (b01) or dihydric phenol (b02), and A ¹ has 2 to 12 carbon atoms (preferably 2 which may contain a halogen atom). To 8 and more preferably 2 to 4), m and m ′ represent an integer of 1 to 300, preferably 2 to 250, particularly preferably 10 to 100, and m and m ′ may be the same. May be different. A ² represents an alkylene group having 2 to 12 carbon atoms (preferably 2 to 8, more preferably 2 to 4) which may contain a halogen atom, and A ¹ and A ² may be the same or different. One of them contains an alkylene group having 2 carbon atoms as an essential component. R represents H or an alkyl group having 1 to 4 carbon atoms (preferably 1 or 2).
The polyether diamine (b2) can be easily obtained by changing both terminal hydroxyl groups of the polyether diol (b1) to amino groups by a known method. As a method for changing a hydroxyl group to an amino group, a known method, for example, a method in which a terminal cyanoalkyl group obtained by cyanoalkylating a hydroxyl group of a polyether diol (b1) is reduced to an amino group (for example, a polyether diol). (b1) is reacted with acrylonitrile and the resulting cyanoethylated product is hydrogenated), polyether diol (b1) is reacted with aminocarboxylic acid or lactam, and polyether diol (b1) is reacted with a halogenated amine. And the like. Two or more of the above-mentioned polymers (b) having a polyoxyethylene chain may be used in combination.

  Mn of the polymer (b) having a polyoxyethylene chain is preferably 150 to 20,000, more preferably 300 to 18,000, particularly preferably 1,000 to 15,000, most preferably from the viewpoint of heat resistance and reactivity with the polyolefin (a). Preferably, it is 1,200 to 8,000.

  The block polymer (B2) is at least one selected from the group consisting of an ester bond, an amide bond, an ether bond and an imide bond, wherein the polyolefin (a) block and the polyoxyethylene chain-containing polymer (b) block are included. Of these, a polymer having a repeating unit represented by the following general formula (1) is preferred from the viewpoint of imparting hydrophilicity and transparency.

In the formula (1), n is an integer of 2 to 50 (preferably 3 to 40, more preferably 4 to 30, particularly preferably 5 to 25), ^one of R ¹ and R ² is H and the other is H. Or a methyl group, y is an integer of 15 to 800 (preferably 20 to 500, more preferably 30 to 400), and E ¹ is a hydroxyl group removed from diol (b01) or dihydric phenol (b02). It is a residue, A ¹ is an ethylene group or an alkylene group having 2 to 4 carbon atoms which essentially contains an ethylene group, and m and m ′ are 1 to 300 (preferably 5 to 200, more preferably 8 to 150). X and X ′ are groups selected from the following general formulas (2) and (3) and corresponding (2 ′) and (3 ′), that is, X is represented by the general formula (2). X ′ is a group represented by the general formula (2 ′), and the same relationship applies to the general formulas (3) and (3 ′).

In the general formulas (2) and (3) and the corresponding formulas (2 ′) and (3 ′), R is the same as described in the polyether diamine (b2) and is H or having 1 to 4 carbon atoms (preferably 1 or 2) an alkyl group, R ³ is a divalent hydrocarbon group having 1 to 11 carbon atoms (preferably 2 to 11, more preferably 5 to 11), and R ⁴ is H or 1 carbon atom. -10 (preferably 1-8, more preferably 1-6), r is an integer of 1-20 (preferably 1-15, more preferably 1-10), and u is 0 or 1 and Q, Q ′, T and T ′ are groups represented by the following formulae.

The general formula (4), (5) and the corresponding (4 '), (5') wherein, R ⁵ is H or C1-10 (preferably 1 to 8, more preferably 1 to 6) R ⁶ is H or a methyl group, t is 1 when R ⁶ is a methyl group, and 0 when H is H.

The polyether segment {(OA ¹ ) _m O—E ¹ —O (A ¹ O) _{m ′} } in {} in the repeating unit represented by the general formula (1) is the polyether diol (b1) or poly It is a structure derived from ether diamine (b2), and E ¹ , A ¹ , m and m ′ in the formula are the same as described above.

  In the general formula (1), the block polymer in which X is a group represented by the general formula (2) and X ′ is a group represented by the general formula (2 ′) includes (a211) and / or (a212) (B21) obtained by polymerizing (b1) and (B22) obtained by polymerizing (a211) and / or (a212) and (b2). (B21) includes (B211) in which (a211) and (b1) are combined, (B212) in which (a212) and (b1) are combined, and a mixture of (B211) and (B212). Similarly, (B22) includes (B221) in which (a211) and (b2) are combined, (B222) in which (a212) and (b2) are combined, and a mixture of (B221) and (B222). included.

  (B21) is a known method, for example, a method of adding (b1) to (a211) and / or (a212) and performing a polymerization (polycondensation) reaction under reduced pressure, preferably at 200 to 250 ° C., or uniaxial Or it can manufacture by the method of superposing | polymerizing using a twin-screw extruder, Preferably it is 160-250 degreeC and residence time 0.1-20 minutes. In the above polymerization reaction, known catalysts such as antimony catalyst (antimony trioxide, etc.); tin catalyst (monobutyltin oxide, etc.); titanium catalyst (tetrabutyl titanate, etc.); zirconium catalyst (tetrabutyl zirconate, etc.); organic acid Metal salt catalysts [zirconium organic acid salts (such as zirconyl acetate), zinc acetate, etc.]; and mixtures of two or more of these. Of these, preferred are a zirconium catalyst and a zirconium organic acid salt, and more preferred is zirconyl acetate. The amount of the catalyst used is preferably 0.001 to 5%, more preferably 0.01 to 3% based on the total mass of (a211) and / or (a212) and (b1).

  Of (B21), (B212) may be reacted with (b2) after (a211) is secondarily modified with the above lactam or aminocarboxylic acid, or (a211) and the lactam or aminocarboxylic acid may be reacted. The reaction may be carried out in the presence of (b1) followed by reaction with (b1).

  (B22) is the same as (B21) except that the combination of (a211) and / or (a212) and (b1) in (B21) is replaced with the combination of (a211) and / or (a212) and (b2) It can be manufactured by the method. Of (B22), (B222) may be produced by secondarily modifying (b2) with the lactam or aminocarboxylic acid and then reacting it with (a211).

  In the general formula (1), the block polymer in which X is a group represented by the general formula (3) and X ′ is a group represented by the general formula (3 ′) includes (a213) (when r = 1) And / or (a214) (when r ≧ 2) and (b1) are subjected to a polymerization reaction (B23) and (a213) and / or (a214) and (b2) are subjected to a polymerization reaction (B24) obtained by (B23) includes (B231) in which (a213) and (b1) are combined, (B232) in which (a214) and (b1) are combined, and a mixture of (B231) and (B232). Similarly, (B24) includes (B241) in which (a213) and (b2) are combined, (B242) in which (a214) and (b2) are combined, and a mixture of (B241) and (B242). included. (B23) and (B24) can be produced by the same method as (B21) and (B22).

  The amount of (b) constituting the block polymer (B2) is preferably 20 to 90 wt%, more preferably 25 to 80 wt% based on the total mass of (a) and (b) from the viewpoint of imparting hydrophilicity. Particularly preferred is 30 to 70 wt%.

  The Mn of the block polymer (B2) is preferably 2,000 to 60,000, more preferably 5,000 to 40,000, and particularly preferably 8,000 to 30,000 from the viewpoint of imparting hydrophilicity.

In the structure of the block polymer (B2), the average number of repeating units (Nn) of the block of the polyolefin (a) and the block of the polymer (b) having a polyoxyethylene chain is preferably from the viewpoint of imparting hydrophilicity. 2 to 50, more preferably 2.3 to 30, particularly preferably 2.7 to 20, and most preferably 3 to 10. Nn can be determined by Mn and ¹ H-NMR analysis of (B2). For example, in the case of (a 211) of blocks and a block (b1) is repeated with the bound structure alternately (B21), the of ¹ H-NMR analysis, an ester bond 4.0~4.1ppm {-C (C = Since signals attributed to protons of O) —OCH ₂ —} and signals attributable to protons of polyethylene glycol of 3.2 to 3.7 ppm can be observed, the ratio of these proton integral values was determined. From this, Nn can be obtained.

  The end of the block polymer (B2) is a carbonyl group derived from the polyolefin (a), an amino group and / or an unmodified polyolefin end (polyolefin end not modified at all, that is, an alkyl group or an alkenyl group), or polyoxyethylene It is either a hydroxyl group and / or an amino group derived from the polymer (b) having a chain. Among these, a carbonyl group, an amino group, and a hydroxyl group are preferable as a terminal from the viewpoint of reactivity, and a carbonyl group and a hydroxyl group are more preferable.

  Examples of the polyether amide imide (B3) include polyether amide imides having a polyoxyethylene chain, as described in JP-B-7-119342 and JP-A-06-172609. Of these, caprolactam (b31), trivalent or tetravalent aromatic polycarboxylic acid (b32) that can react with an amino group to form at least one imide ring, and polyethylene glycol are preferred from the viewpoint of heat resistance. Or a poly (glycol) derived from a mixture (b33) of at least 50 wt% polyethylene glycol and a polyalkylene glycol other than polyethylene glycol, the content of (b33) being 30 to 85 wt%, and the reduced viscosity at 30 ° C. being 1.5 to 4 Ether amide imide is mentioned.

  (b32) includes a trivalent or tetravalent aromatic polycarboxylic acid capable of reacting with an amino group to form at least one imide ring, and an acid anhydride thereof. Examples of the trivalent aromatic polycarboxylic acid include 9 to 18 carbon atoms, such as 1,2,4-trimellitic acid, 1,2,5-naphthalenetricarboxylic acid, 2,6,7-naphthalenetricarboxylic acid, 3, 3 ′, 4-diphenyltricarboxylic acid, benzophenone-3,3 ′, 4-tricarboxylic acid, diphenylsulfone-3,3 ′, 4-tricarboxylic acid, diphenylether-3,3 ′, 4-tricarboxylic acid, and the like An acid anhydride is mentioned. Examples of the tetravalent aromatic polycarboxylic acid include 10 to 20 carbon atoms such as pyromellitic acid, diphenyl-2,2 ′, 3,3′-tetracarboxylic acid, benzophenone-2,2 ′, 3,3′-. Examples thereof include tetracarboxylic acid, diphenylsulfone-2,2 ′, 3,3′-tetracarboxylic acid, diphenyl ether-2,2 ′, 3,3′-tetracarboxylic acid, and acid anhydrides thereof.

  (b33) includes polyethylene glycol or a mixture of at least 50 wt% polyethylene glycol and a polyalkylene glycol other than polyethylene glycol.

  The Mn of polyethylene glycol is not particularly limited, but is preferably 500 to 5,000, more preferably 800 to 3,000, from the viewpoint of imparting hydrophilicity to the polyetheramide imide (B3) and production.

  Examples of the polyalkylene (alkylene having 3 to 18 carbon atoms) glycol other than polyethylene glycol include Mn of 500 to 5,000, such as polypropylene glycol, polytetramethylene glycol, and modified polyalkylene glycol. Examples of the modified polyalkylene glycol include at least two types of addition polymers of alkylene oxides having 2 to 10 carbon atoms (addition form may be random or block). Among these alkylene oxides, ethylene oxide, propylene oxide, 1,3-propylene oxide, 2-methyl-1,3-propylene oxide, and 2,2-dimethyl-1,3-propylene oxide are preferable from the viewpoint of imparting hydrophilicity. 1,5-pentamethylene oxide, 1,6-hexamethylene oxide.

  The equivalent ratio in the reaction of (b32) and glycol (b33) is preferably 0.9 / 1 to 1.1 / 1, and more preferably 0.95 / 1 to 1.05 / 1 mol from the viewpoint of resin physical properties.

  The content of polyamideimide constituting the polyetheramideimide (B3) is preferably 15 to 70 wt%, more preferably 30 to 65 wt%, from the viewpoint of imparting hydrophilicity to (B3) and water resistance of the molded article. Further, the Mn of the polyamideimide moiety in the polyetheramideimide (B3) is preferably 500 to 3,000, more preferably 800 to 2,000 from the viewpoint of the heat resistance of the (B3) and the mechanical strength of the molded product.

  Examples of the method for producing the polyetheramide imide (B3) include the following methods, but are not particularly limited. That is, (b31), (b32), and (b33) are mixed at a ratio such that the equivalent ratio of (b32) and (b33) is preferably 0.9 to 1.1 (more preferably 0.95 to 1.05). ) And (b33) from the viewpoint of imparting hydrophilicity, from the viewpoint of imparting hydrophilicity, (b33) is preferably mixed in an amount of 30 to 85 wt%, more preferably 35 to 70 wt%. While maintaining the rate at 0.1 to 1 wt%, the polycondensation is preferably performed at 150 to 300 ° C, more preferably 180 to 280 ° C. In the polycondensation, the reaction temperature can be raised stepwise. At this time, some caprolactam remains unreacted, but it is desirable to remove it from the reaction mixture by distilling off under reduced pressure from the viewpoint of the resin physical properties of the molded product. The reaction mixture after removing unreacted caprolactam is further polymerized under a reduced pressure (0.03 to 3 kPa), preferably at 200 to 300 ° C. (more preferably 230 to 280 ° C.), if necessary. Can be combined.

  The reduced viscosity of the polyetheramide imide (B3) is preferably 1.5 to 4, more preferably 1.7 to 3.5 from the viewpoint of moldability of the resin composition.

  Examples of the epihalohydrin / alkylene oxide copolymer (B4) include an epihalohydrin / alkylene oxide copolymer having a polyoxyethylene chain in JP-B-7-84564. Examples of the epihalohydrin include epichlorohydrin, epibromohydrin, epiiodohydrin, and epifluorohydrin, and epichlorohydrin is preferable from the viewpoint of reactivity and cost. Examples of the alkylene oxide include 2 to 4 carbon atoms such as ethylene oxide, propylene oxide, and tetrahydrofuran.

  The epihalohydrin / alkylene oxide copolymer (B4) includes one selected from epihalohydrin, 1,2-epoxide monomer (especially alkyl (2 to 4 carbon atoms) glycidyl ether) and alkylene oxide (especially ethylene oxide and propylene oxide). Or the copolymer with the comonomer which consists of 2 or more types is also contained. The mass ratio of epihalohydrin to alkylene oxide is usually 5/95 to 95/5, and preferably 10/90 to 60/40 from the viewpoint of imparting hydrophilicity. The content of oxyethylene units in the polyoxyalkylene chain is preferably 5 to 100 wt%, more preferably 10 to 100 wt%.

  Of the epihalohydrin / alkylene oxide copolymers (B4), a copolymer of epichlorohydrin / ethylene oxide (mass ratio 50/50) is more preferable from the viewpoint of imparting resin properties and hydrophilicity.

  In producing the epihalohydrin / alkylene oxide copolymer (B4), a known catalyst, for example, an organoaluminum compound (triethylaluminum, etc.) or a catalyst obtained by reacting water with an organoaluminum compound to improve polymerizability is used. Can be easily produced by bulk polymerization or solution polymerization. The molar ratio of water to the organoaluminum compound (water / organoaluminum compound) is usually 0.1 / 1 to 1/1, preferably 0.3 / 1 to 0.7 / 1, from the viewpoint of polymerizability. The Mn of the epihalohydrin / alkylene oxide copolymer (B4) is preferably from 30,000 to 100,000, more preferably from 60,000 to 90,000, from the viewpoint of resin physical properties and moldability.

  Examples of the polyether ester (B5) include polyether esters having a polyoxyethylene chain described in JP-B No. 58-19696. The polyether ester (B5) is a polyester having a segment composed of a polyether diol or a copolyether diol, for example, exemplified as a constituent of the polyether ester amide (B1) or the polyether amide imide (B3) (b12). And one or more of (a33), and one or more of the dicarboxylic acids exemplified as the constituent of (B1) or ester-forming derivatives thereof (lower (carbon number 1-4) alkyl esters, acid anhydrides, etc.) Or a transesterification reaction of the diol component with polyethylene terephthalate, polybutylene terephthalate or the like.

  The polyether ester (B5) has a polyether segment content of preferably 30 to 70 wt%, more preferably 40 to 60 wt% from the viewpoint of imparting hydrophilicity to (B5) and moldability of the resin composition, (B5) The melting point (measured by differential scanning calorimetry (hereinafter abbreviated as DSC method)) is preferably 100 ° C. or higher, more preferably 120 to 210 ° C. from the viewpoint of heat resistance. The content of oxyethylene units in the polyoxyalkylene chain is preferably 5 to 100 wt%, more preferably 10 to 100 wt%.

  In addition to the polyolefin resin A) and the polymer B) having a polyoxyethylene chain, if necessary, stabilizers such as antioxidants and UV absorbers, processing aids, lubricants and pigments, and an increase to increase internal crosslinking. You may add a filler, such as a sensitizer and an inorganic substance, in the range which does not impair the required characteristics, such as liquid conveyance performance, transparency, mechanical strength, and elution difficulty.

  The polyolefin resin (A) and the polymer (B) having a polyoxyethylene chain, and if necessary, various additives are melt-mixed, and the polymer (B) having a polyoxyethylene chain in the continuous phase of the polyolefin resin (A) Of the dispersed phase is dispersed. The blending ratio of the polyolefin resin (A) and the polymer (B) having a polyoxyethylene chain varies depending on the material used, but generally preferably 70 to 85 wt% of the polyolefin resin (A) and a polymer having a polyoxyethylene chain ( B) 30-15 wt%. If the amount of the polymer (B) having a polyoxyethylene chain is more than 30 wt%, the hydrophilicity of the liquid transport film becomes too high, which may cause swelling or deformation. On the other hand, if it is less than 15 wt%, sufficient hydrophilicity cannot be obtained, and the effect of transporting liquid does not appear. More preferably, the blending amount of the polymer (B) having a polyoxyethylene chain is 30 to 20 wt%.

  Examples of the melt mixing method include a normal method, for example, a method in which pellets or powdery polymers are mixed with an appropriate mixer such as a Henschel mixer and then melt kneaded with an extruder. The kneading time is preferably 0.1 to 10 minutes, more preferably 1 to 7 minutes. When it is 0.1 minutes or longer, kneading is sufficient, and when it is 10 minutes or less, resin deterioration hardly occurs. The kneading temperature is preferably not lower than the melting points of (A) and (B) and not higher than 280 ° C. This is because resin degradation hardly occurs when the temperature is 280 ° C. or lower.

  The liquid transport film of the present invention is provided with a plurality of fine grooves for controlling the flow direction of the liquid on at least one of its main surfaces. The plurality of fine grooves are formed by molding or embossing. The shape of the groove may be any shape as long as the liquid can be conveyed along the axial direction of the groove. For example, the cross section may be V-shaped, rectangular, or a combination thereof, and may have a shape including a second groove in the first groove.

  The shape of the groove will be described with reference to the drawings. As shown in FIG. 1, the groove 13 can be formed in the polyolefin base material 14 by the series of V-shaped side walls 11 and the tip portion 12. In addition, as shown in FIG. 2, the groove 23 may be formed with the valley portion 22 wide and flat between the slightly flattened tip portions 21. The depth of this groove (that is, the distance from the tip to the bottom) is generally 5 to 3000 μm, preferably 100 to 1000 μm.

  In FIG. 3, a wide first groove 32 is formed between the front end portions 31, and a space between the side walls 35 of the first groove 32 is not a flat surface. A low tip portion 33 is provided, and a second groove 34 is formed between the low tip portions 33.

  In the fine groove formed in this way, the maximum width of the first groove 31 is generally less than 3000 μm, preferably less than 1500 μm. The depth of the first groove is generally 50 to 3000 μm, preferably 100 to 1000 μm. The depth of the second groove is preferably 5 to 50% of the depth of the first groove. The shape of the groove may be other than the shape shown in FIGS. 1 to 3, and the cross-sectional width of the groove may be changed along the axial direction of the groove. Further, the side walls of the grooves may be curved rather than linear in the axial direction of the grooves. In selecting these shapes, shapes that do not interfere with optical properties should be considered in medical specimen applications.

  The liquid transport film of the present invention is obtained by kneading a mixture containing the polyolefin resin (A) and the polymer (B) having a polyoxyethylene chain, and forming it into a film by a normal molding method such as injection molding or extrusion molding. Manufactured by. A plurality of fine grooves on the surface of the liquid transport film are formed using a mold corresponding to the shape of the grooves. As this mold, a silicone mold is preferably used. This is because when a mold made of a material having a high surface polarity such as metal is used, a problem may occur.

  On the surface opposite to the surface on which the groove of the liquid transport film of the present invention is provided, a plurality of layers made of other materials are laminated for use such as a support, or a functional layer such as an adhesive layer is provided. Also good. In addition, a cover sheet may be provided on the groove in order to form a closed channel.

The following examples illustrate the invention.
Production of liquid transport film The materials shown below were kneaded and then press molded at 200 ° C. using a silicone mold to produce a film having the shape shown in FIG. The materials used in each example and the dimensions of each part of this film are shown in Table 1 below.

material
PP11: Polypropylene made by Nippon Polypro (MFR = 11)
PP45: Dow Chemical polypropylene (MFR = 45)
PE803: Nippon Polyethylene Low Density Polyethylene (MFR = 20)
P230: Pelestat 230 manufactured by Sanyo Chemical Industries
P303: Sanyo Chemical Industries Pelestat 303
PEG20000: Wako Pure Chemicals polyethylene glycol (molecular weight 20000)
106A: Daiichi Kogyo Seiyaku nonionic surfactant Silicone mold: Toray Dow Corning silicone SH9556RTV

Liquid transport characteristics evaluation (mist test, initial stage)
The manufactured liquid carrying film was set up vertically and mist-like water droplets were sprayed several times. It was visually evaluated whether water droplets immediately flow downward.

Evaluation of liquid transfer characteristics (after mist test and durability test)
After the initial test was completed, the sample was washed with running water for 30 seconds, air was blown for 1 minute and dried, and then the mist spray test was performed again.

Film transparency evaluation The kneaded resin was formed into a flat film having a thickness shown in Table 1 without using a mold. Then, the total light transmittance was measured with the JEOL haze meter NDH sensor.

Results In the films of Examples 1 to 7, a polymer having a polyoxyethylene chain, which is a feature of the present invention, is used as a hydrophilicity imparting component. As a result, in the mist test, the mist is conveyed downward without remaining as water droplets even after the initial and endurance tests. Also, the total light transmittance was relatively high. On the other hand, in Comparative Examples 1 and 2, when P230 was used as a polymer having a polyoxyethylene chain as a hydrophilicity-imparting component, the addition amount of 10 wt% or less was too small to obtain a sufficient conveying effect. This amount is considered to vary depending on the material used as the polyolefin resin and the polymer having a polyoxyethylene chain.

  In Comparative Examples 3 to 5, since the hydrophilicity imparting component was not added, mist remained as water droplets from the beginning. In Comparative Example 6, a surfactant was used as the hydrophilicity-imparting component, and the mist did not become water droplets at the beginning, but water droplets remained after the durability test. In Comparative Examples 7 to 8, a hydrophilic resin that is not a polymer having a polyoxyethylene chain used in the present invention was used as the hydrophilicity imparting component, and the results of the mist test were good at the initial stage and after the durability test. However, the total light transmittance was relatively low. In Comparative Example 9, a smooth film on both sides was prepared without using a mold, but water droplets remained from the beginning in the mist test. In Comparative Example 10, when P230 was used as a polymer having a polyoxyethylene chain as a hydrophilicity-imparting component, the addition amount of 35 wt% was too much, and the film was deformed due to swelling.

It is sectional drawing which shows the one aspect | mode of the shape of the groove | channel on the liquid conveyance film of this invention. It is sectional drawing which shows the one aspect | mode of the shape of the groove | channel on the liquid conveyance film of this invention. It is sectional drawing which shows the one aspect | mode of the shape of the groove | channel on the liquid conveyance film of this invention. It is sectional drawing which shows the shape of the liquid conveyance film manufactured in the Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Side wall 12 Tip part 13 Groove 14 Base material 21 Tip part 22 Valley part 23 Groove 31 Tip part 32 1st groove | channel 33 Tip part 34 2nd groove | channel

Claims (7)

A) polyolefin resin, and
B) A liquid transport film comprising a mixture containing a polymer having a polyoxyethylene chain and having a plurality of fine grooves on the main surface for controlling the flow direction of the liquid.   The liquid transport film according to claim 1, wherein the mixture contains A) 70 to 85 wt% of a polyolefin resin and B) 30 to 15 wt% of a polymer having a polyoxyethylene chain.   The liquid transport film according to claim 1, wherein the polyolefin resin exhibits a melt flow rate (MFR) of 1 to 500.   The polymer having a polyoxyethylene chain is a polyether ester amide, a polyolefin block and a polymer block having a polyoxyethylene chain are at least one selected from the group consisting of an ester bond, an amide bond, an ether bond and an imide bond. Block copolymers, polyether amide imides, epihalohydrin / alkylene oxide copolymers, polyether esters, methoxypolyethylene glycol (meth) acrylate copolymers, polyether group-containing ethylene / vinyl acetate copolymers having structures that are alternately and repeatedly bonded through seed bonds And a liquid transport film according to claim 1 selected from the group consisting of a mixture of two or more thereof.   The liquid transport film according to claim 1, wherein the groove has a V shape, a rectangular shape, or a combination of a V shape and a rectangular shape.   The liquid transport film according to claim 1, wherein the groove has a depth of 5 to 3000 μm.   The groove has a first groove and a second groove formed in the first groove, the depth of the first groove is 50 to 3000 μm, and the depth of the second groove The liquid transport film according to claim 1, wherein is 5 to 50% of the depth of the first groove.

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