WO2018100969A1 - 重合体ラテックスの製造方法 - Google Patents
重合体ラテックスの製造方法 Download PDFInfo
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- WO2018100969A1 WO2018100969A1 PCT/JP2017/039741 JP2017039741W WO2018100969A1 WO 2018100969 A1 WO2018100969 A1 WO 2018100969A1 JP 2017039741 W JP2017039741 W JP 2017039741W WO 2018100969 A1 WO2018100969 A1 WO 2018100969A1
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- rosin
- weight
- acid
- latex
- synthetic polyisoprene
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- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
- C08J3/07—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from polymer solutions
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/10—Latex
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
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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
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/14—Dipping a core
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
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- C—CHEMISTRY; METALLURGY
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- 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
- C08J5/02—Direct processing of dispersions, e.g. latex, to articles
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- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L53/00—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers
- C08L53/02—Compositions of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Compositions of derivatives of such polymers of vinyl-aromatic monomers and conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J109/00—Adhesives based on homopolymers or copolymers of conjugated diene hydrocarbons
- C09J109/10—Latex
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/08—Macromolecular additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
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- 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
- B29K2007/00—Use of natural rubber as moulding material
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- 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
- B29K2105/0058—Liquid or visquous
- B29K2105/0064—Latex, emulsion or dispersion
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/10—Latex
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- 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
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
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- 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
- C08J2353/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2353/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- 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
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- 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
- C08J2409/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2409/10—Latex
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- 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
- C08J2453/00—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers
- C08J2453/02—Characterised by the use of block copolymers containing at least one sequence of a polymer obtained by reactions only involving carbon-to-carbon unsaturated bonds; Derivatives of such polymers of vinyl aromatic monomers and conjugated dienes
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- 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
- C08J2493/00—Characterised by the use of natural resins; Derivatives thereof
- C08J2493/04—Rosin
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/52—Aqueous emulsion or latex, e.g. containing polymers of a glass transition temperature (Tg) below 20°C
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J2409/00—Presence of diene rubber
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J2493/00—Presence of natural resin
Definitions
- the present invention relates to a method for producing a polymer latex capable of giving a dip-molded article excellent in tensile strength and tear strength.
- a latex composition containing latex of natural rubber is dip-molded to obtain a dip-molded body that is used in contact with a human body such as a nipple, a balloon, a glove, a balloon, and a sack.
- natural rubber latex contains a protein that causes allergic symptoms in the human body, there are cases in which there is a problem as a dip-molded product that is in direct contact with a living mucous membrane or an organ. Therefore, studies have been made on using synthetic rubber latex instead of natural rubber latex.
- Patent Document 1 discloses a synthetic polyisoprene latex produced by using a metal salt of rosin as an emulsifier as a latex used for dip molding.
- a metal salt of rosin as an emulsifier
- the resulting synthetic polyisoprene latex can obtain a dip-molded product that is somewhat excellent in tensile strength and tear strength, but tensile strength and tear strength. Further improvements in strength were desired.
- the present invention has been made in view of such a situation, and an object of the present invention is to provide a method for producing a polymer latex capable of providing a dip-molded article excellent in tensile strength and tear strength.
- the inventors of the present invention have used synthetic polyisoprene and / or styrene-isoprene-styrene block copolymer by using a predetermined rosin and / or metal salt of rosin as an emulsifier.
- a predetermined rosin and / or metal salt of rosin as an emulsifier.
- a polymer solution of synthetic polyisoprene and / or styrene-isoprene-styrene block copolymer is emulsified in water in the presence of rosin and / or a metal salt of rosin, thereby emulsifying.
- a polymer using a rosin and / or a metal salt of the rosin, wherein the total content of these salts is 5% by weight or less as the rosin and / or metal salt of the rosin A method for producing a latex is provided.
- the synthetic polyisoprene and / or the styrene-isoprene-styrene block copolymer obtained by polymerization by anionic polymerization.
- a polymer solution of the synthetic polyisoprene and / or the styrene-isoprene-styrene block copolymer is obtained by polymerization by anionic polymerization, and the polymer solution is coagulated. It is preferable to directly emulsify using an aqueous solution of the rosin and / or metal salt of rosin without passing through the above.
- the total content of the rosin and / or metal salt of rosin in the polymer latex is such that the synthetic polyisoprene and / or the styrene contained in the polymer latex. -More than 1.5 parts by weight with respect to 100 parts by weight of the total of the isoprene-styrene block copolymer.
- a method for producing a latex composition comprising a step of adding a vulcanizing agent to the polymer latex obtained by the above production method.
- the manufacturing method of a dip molded object provided with the process of dip-molding the latex composition obtained by said manufacturing method is provided. Furthermore, according to the present invention, the polymer latex obtained by the above production method is applied on the first sheet base material and / or the second sheet base material to form a coating film. At least a part of the first sheet base material and at least a part of the second sheet base material are bonded and laminated, and an object to be packaged is provided between the first sheet base material and the second sheet base material. A method of manufacturing a package structure that can be accommodated is provided.
- the method for producing a polymer latex of the present invention comprises emulsifying a polymer solution of synthetic polyisoprene and / or styrene-isoprene-styrene block copolymer in water in the presence of rosin and / or a metal salt of rosin.
- the rosin and / or the metal salt of the rosin is abietic acid, neoabietic acid and parastrinic acid, and the total content of these salts is 5% by weight or less. It is characterized by using.
- the polymer solution of synthetic polyisoprene and / or styrene-isoprene-styrene block copolymer includes a polymer solution of synthetic polyisoprene, a polymer solution of styrene-isoprene-styrene block copolymer, or a synthetic polyisoprene. And a polymer solution containing a styrene-isoprene-styrene block copolymer can be used.
- the synthetic polyisoprene contained in the synthetic polyisoprene polymer solution may be a homopolymer of isoprene or other ethylenically unsaturated monomers copolymerizable with isoprene. May be copolymerized.
- the content of isoprene units in the synthetic polyisoprene is flexible, and it is easy to obtain a film molded body such as a dip molded body having excellent tensile strength. More preferred is 90% by weight or more, still more preferred is 95% by weight or more, and particularly preferred is 100% by weight (isoprene homopolymer).
- Examples of other ethylenically unsaturated monomers copolymerizable with isoprene include conjugated diene monomers other than isoprene such as butadiene, chloroprene and 1,3-pentadiene; acrylonitrile, methacrylonitrile, fumaronitrile, ⁇ - Ethylenically unsaturated nitrile monomers such as chloroacrylonitrile; vinyl aromatic monomers such as styrene and alkylstyrene; methyl (meth) acrylate (meaning “methyl acrylate and / or methyl methacrylate”; The same applies to ethyl (meth) acrylate, etc.), ethylenically unsaturated carboxylic acid ester monomers such as ethyl (meth) acrylate, butyl (meth) acrylate, and 2-ethylhexyl (meth) acrylate; Is mentioned.
- Synthetic polyisoprene may be polymerized in any manner such as a conventionally known method, coordination polymerization or anionic polymerization.
- a Ziegler polymerization catalyst is used when polymerizing by coordination polymerization.
- a preferred method is to obtain a polymer solution of synthetic polyisoprene by solution polymerization of isoprene and other copolymerizable ethylenically unsaturated monomers used as necessary in an inert polymerization solvent. is there.
- the Ziegler-based polymerization catalyst is not particularly limited and may be a known one. For example, it can be obtained by reducing titanium tetrachloride with an organoaluminum compound and further treating with various electron donors and electron acceptors.
- a catalyst system in which a titanium trichloride composition and an organoaluminum compound are combined a supported catalyst system in which titanium tetrachloride and various electron donors are brought into contact with magnesium halide, and among these, titanium tetrachloride and A catalyst system using an organoaluminum compound is preferred, and a catalyst system using titanium tetrachloride and trialkylaluminum is particularly preferred.
- an isoprene and another copolymerizable ethylenically unsaturated monomer used as necessary are used in an inert polymerization solvent using an organic alkali metal catalyst.
- a method of obtaining a polymer solution of synthetic polyisoprene by solution polymerization is suitable.
- anionic polymerization can proceed with a high living property, so a synthetic polyisoprene having a high weight average molecular weight can be obtained in a high yield. Therefore, it is preferable.
- the organic alkali metal catalyst is not particularly limited, and a known one can be used.
- Monolithium compounds organic polylithium such as dilithiomethane, 1,4-dilithiobutane, 1,4-dilithio-2-ethylcyclohexane, 1,3,5-trilithiobenzene, 1,3,5-tris (lithiomethyl) benzene
- organic sodium compounds such as sodium naphthalene
- organic power lium compounds such as potassium naphthalene
- organic alkali metal catalysts can be used alone or in combination of two or more.
- polymerization solvent used for the polymerization examples include organic solvents such as aromatic hydrocarbon solvents such as benzene, toluene and xylene; alicyclic hydrocarbon solvents such as cyclopentane, cyclopentene, cyclohexane and cyclohexene; And aliphatic hydrocarbon solvents such as butane, pentane, hexane and heptane; halogenated hydrocarbon solvents such as methylene chloride, chloroform and ethylene dichloride; and the like. Of these, aliphatic hydrocarbon solvents are preferred, butane, hexane and pentane are more preferred, hexane is further preferred, and normal hexane is particularly preferred.
- isoprene units in the synthetic polyisoprene which are cis bond units, trans bond units, 1,2-vinyl bond units, and 3,4-vinyl bond units, depending on the bond state of isoprene.
- the content of cis-bond units in the isoprene units contained in the synthetic polyisoprene is preferably 70% by weight or more, more preferably 90% by weight based on the total isoprene units. % Or more, more preferably 95% by weight or more.
- the weight average molecular weight of the synthetic polyisoprene is preferably 10,000 to 5,000,000, more preferably 500,000 to 5,000,000, and even more preferably, in terms of standard polystyrene by gel permeation chromatography analysis. Is 800,000 to 3,000,000.
- the polymer Mooney viscosity (ML 1 + 4 , 100 ° C.) of the synthetic polyisoprene is preferably 50 to 80, more preferably 60 to 80, and still more preferably 70 to 80.
- Styrene-isoprene-styrene block copolymer contained in the polymer solution of styrene-isoprene-styrene block copolymer is a block of styrene and isoprene. It is a copolymer (“S” represents a styrene block, and “I” represents an isoprene block).
- the content ratio of the styrene unit and the isoprene unit in the SIS is usually 1:99 to 90:10, preferably 3:97 to 70:30, more preferably 5:95 in a weight ratio of “styrene unit: isoprene unit”. It is in the range of ⁇ 50: 50, more preferably 10:90 to 30:70.
- the SIS may be polymerized by any known method, such as coordination polymerization or anionic polymerization.
- a Ziegler polymerization catalyst is used, and the SIS is inert.
- a method of obtaining a SIS polymer solution by solution polymerization of a monomer containing styrene and a monomer containing isoprene in a polymerization solvent is suitable.
- the Ziegler polymerization catalyst is not particularly limited, and the Ziegler polymerization catalyst described above can be used.
- SIS-containing monomer and isoprene-containing monomer are solution-polymerized in an inert polymerization solvent using an organic alkali metal catalyst.
- a method for obtaining a polymer solution of is preferable.
- an organic alkali metal catalyst as a polymerization catalyst for anionic polymerization, anionic polymerization can proceed with a high living property, so a synthetic polyisoprene having a high weight average molecular weight can be obtained in a high yield. Therefore, it is preferable.
- It does not specifically limit as an organic alkali metal catalyst The organic alkali metal catalyst mentioned above can be used.
- the inert polymerization solvent is not particularly limited as long as it is inert to the polymerization reaction.
- the above-described organic solvents can be used.
- the polymerization temperature at the time of solution polymerization of the monomer containing styrene and the monomer containing isoprene is preferably 35 to 80 from the viewpoint that a polymer latex can be produced with high productivity. ° C, more preferably 40 to 75 ° C.
- the weight average molecular weight of SIS is preferably 50,000 to 500,000, more preferably 70,000 to 400,000, and still more preferably 100,000 to 350 in terms of standard polystyrene by gel permeation chromatography analysis. , 000.
- SIS has a molecular weight distribution (Mw / Mn) of preferably 1.0 to 2.6, more preferably 1.0 to 2.4, and further preferably 1.0 to 2.2.
- Mw / Mn molecular weight distribution
- either one of the above-mentioned synthetic polyisoprene or SIS may be used, or both may be used. It is preferable to produce a synthetic polyisoprene latex as a combined latex.
- a polymer is obtained by using the synthetic polyisoprene and / or SIS polymer solution obtained by the above coordination polymerization or anion polymerization, for example, by the following method.
- Latex can be produced. That is, (1) Synthetic polyisoprene and / or SIS that has been coagulated once is obtained from a polymer solution of synthetic polyisoprene and / or SIS obtained by coordination polymerization or anionic polymerization, and this is dissolved or dissolved in an organic solvent.
- a synthetic polyisoprene and / or SIS polymer solution (solution or fine suspension) is obtained, and the obtained synthetic polyisoprene and / or SIS polymer solution is added with rosin as an emulsifier and (2)
- a method for producing a polymer latex by emulsification in water in the presence of a metal salt of rosin (2) a polymer solution of synthetic polyisoprene obtained by coordination polymerization or anionic polymerization is subjected to coagulation. And then emulsifying directly in water in the presence of rosin and / or a metal salt of rosin as an emulsifier.
- any of the above methods (1) and (2) may be adopted.
- the heat history due to coagulation can be reduced.
- the method (2) is preferred.
- Examples of the organic solvent used in the production method (1) above include aromatic hydrocarbon solvents such as benzene, toluene and xylene; alicyclic hydrocarbon solvents such as cyclopentane, cyclopentene, cyclohexane and cyclohexene; pentane, hexane, And aliphatic hydrocarbon solvents such as heptane; halogenated hydrocarbon solvents such as methylene chloride, chloroform and ethylene dichloride; Of these, aliphatic hydrocarbon solvents are preferred, hexane is more preferred, and normal hexane is particularly preferred.
- the amount of the organic solvent used is preferably 2,000 parts by weight or less, more preferably 20 to 1,500 parts by weight, and still more preferably 500 to 1, 500 parts by weight.
- rosin and / or a metal salt of rosin (hereinafter referred to as “rosin”) is used as an emulsifier for emulsifying synthetic polyisoprene and / or SIS.
- rosin surfactant the total content of abietic acid, neoabietic acid and parastrinic acid, and salts thereof is used. Using 5% by weight or less.
- rosin surfactant by using the above specific rosin surfactant as an emulsifier, it is possible to improve the tensile strength and tear strength when the resulting polymer latex is a dip-molded product.
- the emulsifier remains slightly in the obtained polymer latex.
- the rosin-based surfactant is used as an emulsifier, the present inventors will leave a slight amount of rosin-based surfactant in the resulting polymer latex.
- a latex composition obtained by adding a vulcanizing agent such as sulfur is obtained, and when it is intended to be molded into a dip-molded product, a resin acid derived from a rosin-based surfactant contained in the polymer latex (In particular, abietic acid having a conjugated double bond, neoabietic acid, and parastolic acid) reacts with a vulcanizing agent such as sulfur, thereby reducing the crosslinking efficiency of the dip-molded product and increasing the tensile strength of the dip-molded product. It was found that the strength and tear strength were reduced.
- a resin acid derived from a rosin-based surfactant contained in the polymer latex In particular, abietic acid having a conjugated double bond, neoabietic acid, and parastolic acid
- a vulcanizing agent such as sulfur
- the emulsifier is obtained by using a rosin-based surfactant having a total content of 5% by weight or less of abietic acid, neoabietic acid and parastrinic acid, and salts thereof.
- a rosin-based surfactant having a total content of 5% by weight or less of abietic acid, neoabietic acid and parastrinic acid, and salts thereof.
- rosin used in the present invention those using natural resins containing a resin acid such as abietic acid, neoabietic acid, parastrinic acid, pimaric acid, isopimaric acid and dehydroabietic acid as raw materials can be used.
- a resin acid such as abietic acid, neoabietic acid, parastrinic acid, pimaric acid, isopimaric acid and dehydroabietic acid
- examples include tall rosin obtained from crude tall oil by-produced in the pulp production process; gum rosin obtained from raw pine crabs; wood rosin extracted from felled pine; among these, tall rosin is preferred.
- rosin metal salts those obtained by metallizing resin acids contained in these rosins may be used.
- rosin potassium salt (a mixture of potassium salts of resin acids contained in rosin)
- rosin Sodium salt (a mixture of sodium salts of resin acids contained in rosin)
- potassium salt of tall rosin and sodium salt of tall rosin are more preferable.
- the rosin and / or rosin metal salt (rosin-based surfactant) used in the present invention has a total content of 5% by weight of abietic acid, neoabietic acid and parastrinic acid, and salts thereof. However, it is preferably 3% by weight or less, more preferably 1% by weight or less. If the total content of abietic acid, neoabietic acid and parastrinic acid, and their salts is too large, the effect of suppressing the decrease in tensile strength and tear strength of the resulting dip-molded product will be insufficient. . In addition, the minimum of the total content rate of abietic acid, neoabietic acid, parastrinic acid, and these salts is not specifically limited.
- the rosin-based surfactant used in the present invention may be abietic acid, neoabietic acid, and parastrinic acid, and the total content of these salts as long as it is 5% by weight or less.
- the content ratio of the acid and its salt is 5% by weight or less, preferably 3% by weight or less, more preferably 1% by weight or less.
- abietic acid and its salt are relatively highly reactive with vulcanizing agents such as sulfur, and have the effect of reducing the crosslinking efficiency of the resulting dip-formed product. Since it is large, the tensile strength and tear strength of the resulting dip-molded product can be further improved by controlling the content ratio of such abietic acid and its salt within the above range.
- the rosin surfactant is not particularly limited as a method for controlling the total content of abietic acid, neoabietic acid and parastrinic acid, and salts thereof within the above range. A method of disproportionation using a catalyst is preferred.
- the disproportionation catalyst is not particularly limited.
- supported catalysts such as palladium-carbon, rhodium-carbon, platinum-carbon; metal powders such as nickel and platinum; iodine, iron iodide, nickel iodide, and iodide.
- Known catalysts such as iodine-based catalysts such as tin, zinc iodide, cobalt iodide, and copper iodide can be used.
- supported catalysts are preferable, and palladium-carbon is more preferable.
- the reaction conditions for disproportionating the rosin surfactant are not particularly limited, but it is preferable to carry out the reaction in the presence of a disproportionation catalyst in an inert gas atmosphere such as nitrogen gas.
- the reaction temperature at this time is not particularly limited, but is preferably 100 to 300 ° C, more preferably 200 to 250 ° C.
- the reaction time is not particularly limited, but is preferably 1 to 10 hours, more preferably 2 to 5 hours.
- rosin surfactant When the rosin surfactant is disproportionated, among the resin acids contained in the rosin surfactant, at least a part of abietic acid, neoabietic acid, and parastrinic acid is caused by a disproportionation reaction. Dehydroabietic acid and the like.
- the content ratio of dehydroabietic acid in the disproportionated rosin surfactant is not particularly limited, but is preferably 70 to 100% by weight, more preferably 80% by weight or more, still more preferably 90% by weight or more, more preferably Is 96% by weight or less, more preferably 93% by weight or less.
- the content ratio of abietic acid, neoabietic acid and parastrinic acid, and salts thereof in the rosin-based surfactant can be reduced, and as a result, the resulting dip
- the tensile strength and tear strength of the molded body can be further improved.
- the amount of the rosin surfactant used as an emulsifier in emulsifying the synthetic polyisoprene and / or SIS is preferably 1 to 15 parts by weight with respect to 100 parts by weight of the total of the synthetic polyisoprene and SIS.
- the amount is more preferably 3 to 12 parts by weight, still more preferably 5 to 10 parts by weight.
- the amount of water used in emulsifying the synthetic polyisoprene and / or SIS is preferably 10 to 200 parts by weight, more preferably 30 to 30 parts by weight with respect to 100 parts by weight of the polymer solution of the synthetic polyisoprene and / or SIS. 100 parts by weight, most preferably 50 to 70 parts by weight.
- the water to be used include hard water, soft water, ion exchange water, distilled water, zeolite water and the like, and soft water, ion exchange water and distilled water are preferable. If the amount of water used is too small, emulsification will be insufficient, while if too much, productivity will decrease.
- emulsifiers that are generally marketed as emulsifiers or dispersers are particularly limited. Can be used without The method for adding the rosin surfactant to the synthetic polyisoprene and / or SIS polymer solution is not particularly limited, and is either water or a synthetic polyisoprene and / or SIS polymer solution in advance, or It may be added to both, or during the emulsification operation, it may be added to the emulsion, or it may be added all at once or in divided portions.
- emulsifier examples include batch type emulsification such as trade name “Homogenizer” (manufactured by IKA), trade name “Polytron” (manufactured by Kinematica), trade name “TK auto homomixer” (manufactured by Tokushu Kika Kogyo Co., Ltd.), etc.
- a method for removing the organic solvent from the emulsion a method capable of setting the content of the organic solvent (preferably an aliphatic hydrocarbon solvent) in the emulsion to 500 ppm by weight or less is preferable.
- methods such as atmospheric distillation, steam distillation, and centrifugal separation can be employed, vacuum distillation is preferred from these viewpoints because the organic solvent can be removed appropriately and efficiently.
- Additives usually added in the latex field such as pH adjusters, antifoaming agents, preservatives, chelating agents, oxygen scavengers, dispersants, anti-aging agents, etc. May be.
- the pH adjuster include alkali metal hydroxides such as sodium hydroxide and potassium hydroxide; alkali metal carbonates such as sodium carbonate and potassium carbonate; alkali metal hydrogen carbonates such as sodium bicarbonate; ammonia
- An organic amine compound such as trimethylamine or triethanolamine; an alkali metal hydroxide or ammonia is preferred.
- the solid content concentration in the polymer latex after removing the organic solvent, it is desirable to perform a concentration operation by a method such as vacuum distillation, atmospheric distillation, centrifugation, membrane concentration, etc., in order to increase the solid content concentration in the polymer latex, if necessary.
- a concentration operation by a method such as vacuum distillation, atmospheric distillation, centrifugation, membrane concentration, etc.
- centrifugation from the viewpoint that the solid content concentration in the polymer latex can be increased and the content of the rosin surfactant in the polymer latex can be adjusted.
- Centrifugation can be performed using, for example, a continuous centrifuge or a batch centrifuge, but is preferably performed using a continuous centrifuge from the viewpoint of excellent polymer latex productivity.
- a polymer latex can be obtained as a light liquid that is a part of the dispersion after centrifugation.
- the final liquid obtained by removing the polymer latex as the light liquid is contained in the residual liquid after the desired amount of rosin surfactant to be removed is contained.
- the content of the rosin surfactant in the combined latex can be adjusted appropriately.
- the content ratio of the rosin surfactant in the finally obtained polymer latex is preferably 1.5 parts by weight with respect to 100 parts by weight of the synthetic polyisoprene and / or SIS contained in the latex. More than, more preferably more than 1.7 parts by weight, still more preferably 1.8 parts by weight or more, preferably 10 parts by weight or less, more preferably 5 parts by weight or less, still more preferably 3 parts by weight or less.
- the solid concentration of the emulsion used for centrifugation is preferably 5 to 11% by weight, more preferably 7 to 10.7% by weight, still more preferably 9 to 10.5% by weight. is there.
- the solid content concentration of the emulsion before centrifugation is preferably 5 to 11% by weight, more preferably 7 to 10.7% by weight, still more preferably 9 to 10.5% by weight. is there.
- the amount of the rosin surfactant in the finally obtained polymer latex can be appropriately adjusted to a desired amount, which is preferable.
- the centrifugal acceleration is preferably 5,000 to 11,000 G, more preferably 6,000 to 10,000 G, and still more preferably. Is 7,000 to 9,500 G, and the feed amount of the emulsion to the continuous centrifuge is preferably 0.5 to 1.5 m 3 / hour, more preferably 0.7 to 1.45 m 3 / hour. More preferably, it is 0.9 to 1.4 m 3 / hour, and the residence time in the continuous centrifuge is preferably 2.0 to 4.0 minutes, more preferably 2.5 to 3.0 minutes, The back pressure (gauge pressure) of the centrifuge is preferably 0.03 to 1.6 MPa.
- the centrifugation conditions as described above, aggregation of the synthetic polyisoprene, SIS, etc. during the centrifugation can be prevented, thereby improving the mechanical stability of the emulsion and finally
- the amount of the rosin surfactant in the polymer latex obtained in the above is preferable because it can be appropriately adjusted to a desired amount.
- the amount of the rosin surfactant in the polymer latex is mainly used when emulsifying the polymer solution of synthetic polyisoprene and / or SIS in water. It can adjust by combining suitably the solid content density
- Latex Composition The method for producing a latex composition of the present invention comprises a step of adding a vulcanizing agent to the above-described polymer latex of the present invention.
- the vulcanizing agent examples include sulfur such as powdered sulfur, sulfur white, precipitated sulfur, colloidal sulfur, surface-treated sulfur, insoluble sulfur, etc .; sulfur chloride, sulfur dichloride, morpholine disulfide, alkylphenol disulfide, N, N'- Examples thereof include sulfur-containing compounds such as dithio-bis (hexahydro-2H-azepinone-2), phosphorus-containing polysulfides, polymer polysulfides, and 2- (4′-morpholinodithio) benzothiazole. Among these, sulfur can be preferably used. Vulcanizing agents can be used alone or in combination of two or more.
- the content of the vulcanizing agent is not particularly limited, but is preferably 0.1 to 10 parts by weight, more preferably 0.2 to 3 parts, based on 100 parts by weight of the synthetic polyisoprene and SIS contained in the latex. Parts by weight. By making content of a vulcanizing agent into the said range, the tensile strength of the dip molding obtained can be raised more.
- the latex composition preferably further contains a vulcanization accelerator.
- a vulcanization accelerator those usually used in the method for obtaining dip molding can be used.
- Dithiocarbamic acids such as acids and zinc salts thereof; 2-mercaptobenzothiazole, 2-mercaptobenzothiazole zinc, 2-mercaptothiazoline, dibenzothiazyl disulfide, 2- (2,4-dinitrophenylthio) benzothiazole, 2 -(N, N-diethylthiocarbaylthio) benzothiazole, 2- (2,6-dimethyl-4-morpholinothio) benzothiazole, 2- (4'-morpholino dithio) Nzothiazole, 4-morpholinyl-2-benzothiazyl disulfide, 1,3-bis (2-benzothiazyl mercaptomethyl) urea, and the like, zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate
- the content of the vulcanization accelerator is preferably 0.05 to 5 parts by weight, more preferably 0.1 to 2 parts by weight with respect to 100 parts by weight of the total of synthetic polyisoprene and SIS contained in the latex. It is. By making content of a vulcanization accelerator into the said range, the tensile strength of the dip molding obtained can be raised more.
- the latex composition preferably further contains an anti-aging agent.
- Antiaging agents include 2,6-di-4-methylphenol, 2,6-di-t-butylphenol, butylhydroxyanisole, 2,6-di-t-butyl- ⁇ -dimethylamino-p-cresol, Octadecyl-3- (3,5-di-t-butyl-4-hydroxyphenyl) propionate, styrenated phenol, 2,2′-methylene-bis (6- ⁇ -methyl-benzyl-p-cresol), 4, Butylation of 4'-methylenebis (2,6-di-t-butylphenol), 2,2'-methylene-bis (4-methyl-6-t-butylphenol), alkylated bisphenol, p-cresol and dicyclopentadiene Phenol-based antioxidants containing no sulfur atom, such as reaction products; 2,2′-thiobis- (4-methyl-6-tert-butylphenol) 4,4′-thiobis- (6
- anti-aging agents can be used alone or in combination of two or more.
- a phenolic anti-aging agent is preferable and a phenolic anti-aging agent containing no sulfur atom is more preferable because it has a small effect of inhibiting the vulcanization reaction and a large antioxidant effect.
- the content of the anti-aging agent is preferably 0.1 to 10 parts by weight, more preferably 1 to 7 parts by weight, and still more preferably 3 parts by weight based on 100 parts by weight of the synthetic polyisoprene and SIS contained in the latex. ⁇ 6 parts by weight.
- the content of the antioxidant is preferably 0.1 to 10 parts by weight, more preferably 1 to 7 parts by weight, and still more preferably 3 parts by weight based on 100 parts by weight of the synthetic polyisoprene and SIS contained in the latex. ⁇ 6 parts by weight.
- the latex composition preferably further contains zinc oxide.
- the content of zinc oxide is not particularly limited, but is preferably 0.1 to 5 parts by weight, more preferably 0.2 to 2 parts by weight with respect to 100 parts by weight of the total of synthetic polyisoprene and SIS contained in the latex. Part.
- the latex composition may further contain a compounding agent such as a dispersant; a reinforcing agent such as carbon black, silica, or talc; a filler such as calcium carbonate or clay; an ultraviolet absorber; a plasticizer; Can do.
- a compounding agent such as a dispersant
- a reinforcing agent such as carbon black, silica, or talc
- a filler such as calcium carbonate or clay
- an ultraviolet absorber such as calcium carbonate or clay
- a plasticizer such as a plasticizer
- the method for preparing the latex composition of the present invention is not particularly limited.
- a dispersing machine such as a ball mill, a kneader, or a disper
- the polymer latex is added with a vulcanizing agent and / or a vulcanization accelerator, and necessary.
- the method of mixing with polymer latex is mentioned.
- the latex composition preferably has a pH of 7 or more, more preferably in the range of 7 to 13, and even more preferably in the range of 8 to 12.
- the solid content concentration of the latex composition is preferably in the range of 15 to 65% by weight.
- the latex composition is preferably aged (pre-crosslinked) before being subjected to dip molding from the viewpoint of further improving the mechanical properties of the resulting dip molded article.
- the pre-crosslinking time is not particularly limited and depends on the pre-crosslinking temperature, but is preferably 1 to 14 days, and more preferably 1 to 7 days.
- the pre-crosslinking temperature is preferably 20 to 40 ° C. After pre-crosslinking, it is preferably stored at a temperature of 10 to 30 ° C. until it is used for dip molding. When stored at a high temperature, the tensile strength of the resulting dip-molded product may decrease.
- Dip Molded Body The method for producing a dip molded body of the present invention includes a step of dip molding the latex composition.
- Dip molding is a method in which a mold is immersed in a latex composition, the composition is deposited on the surface of the mold, the mold is then lifted from the composition, and then the composition deposited on the mold surface is dried. is there.
- the mold before being immersed in the latex composition may be preheated. Further, a coagulant can be used as necessary before the mold is immersed in the latex composition or after the mold is pulled up from the latex composition.
- the method of using the coagulant include a method in which the mold before dipping in the latex composition is immersed in a solution of the coagulant to attach the coagulant to the mold (anode coagulation dipping method), and the latex composition is deposited.
- anode coagulation dipping method There is a method of immersing the formed mold in a coagulant solution (Teag adhesion dipping method), etc., but the anode adhesion dipping method is preferable in that a dip-formed product with little thickness unevenness can be obtained.
- coagulants include metal halides such as barium chloride, calcium chloride, magnesium chloride, zinc chloride, and aluminum chloride; nitrates such as barium nitrate, calcium nitrate, and zinc nitrate; acetic acid such as barium acetate, calcium acetate, and zinc acetate. Salts; water-soluble polyvalent metal salts such as calcium sulfate, magnesium sulfate, and sulfates such as aluminum sulfate; Of these, calcium salts are preferable, and calcium nitrate is more preferable. These water-soluble polyvalent metal salts can be used alone or in combination of two or more.
- the coagulant is preferably used in the form of an aqueous solution.
- This aqueous solution may further contain a water-soluble organic solvent such as methanol or ethanol, or a nonionic surfactant.
- concentration of the coagulant varies depending on the type of the water-soluble polyvalent metal salt, but is preferably 5 to 50% by weight, more preferably 10 to 30% by weight.
- the deposit formed on the mold is usually dried by heating. What is necessary is just to select drying conditions suitably.
- the heating conditions at the time of crosslinking are not particularly limited, but are preferably 60 to 150 ° C., more preferably 100 to 130 ° C., and preferably 10 to 120 minutes.
- the heating method is not particularly limited, and there are a method of heating with warm air in an oven, a method of heating by irradiating infrared rays, and the like.
- the mold may be washed with water or warm water to remove water-soluble impurities (for example, excess surfactant or coagulant) before or after heating the mold on which the latex composition is deposited.
- water-soluble impurities for example, excess surfactant or coagulant
- the hot water used is preferably 40 ° C. to 80 ° C., more preferably 50 ° C. to 70 ° C.
- the dip-formed body after crosslinking is detached from the mold.
- the desorption method include a method of peeling from a mold by hand, a method of peeling by water pressure or compressed air pressure, and the like. If the dip-formed product in the middle of crosslinking has sufficient strength against desorption, it may be desorbed in the middle of crosslinking, and then the subsequent crosslinking may be continued.
- the dip-molded body is obtained by using the latex composition obtained by the production method of the present invention, it has excellent tensile strength and can be particularly suitably used as a glove.
- the dip-molded body is a glove, in order to prevent the dip-molded bodies from sticking to each other at the contact surface, and to improve the slippage when attaching and detaching, the glove is made of inorganic fine particles such as talc and calcium carbonate or organic fine particles such as starch particles. It may be dispersed on the surface, an elastomer layer containing fine particles may be formed on the surface of the glove, or the surface layer of the glove may be chlorinated.
- the dip-molded body includes medical supplies such as nipples for baby bottles, syringes, tubes, water pillows, balloon sacks, catheters and condoms; toys such as balloons, dolls and balls; It can also be used for industrial goods such as gas storage bags;
- the method for producing a packaging structure of the present invention comprises forming the coating film by applying the polymer latex on the first sheet base material and / or the second sheet base material. A step of bonding and laminating at least part of the first sheet base material and at least part of the second sheet base material.
- the packaging structure obtained by the production method of the present invention has a structure in which a first sheet base material and a second sheet base material coated with a polymer latex are bonded and laminated, and a packaged object can be accommodated. Specifically, in the packaging structure, the first sheet base material and the second sheet base material face each other so that the surfaces coated with the polymer latex (latex coated surface) face each other as necessary.
- the first sheet base material and the second sheet base material are sandwiched between the first sheet base material and the second sheet base material by pressing in a state where the latex coated surfaces of the first sheet base material and the second sheet base material are in contact with each other. Are bonded to each other, whereby the packaged object can be packaged.
- a to-be-packaged object For example, the various to-be-packaged goods which it is desired to sterilize like medical goods, such as a bandage, are mentioned.
- a 1st sheet base material and a 2nd sheet base material For example, paper materials, such as glassine paper, a high density polyethylene nonwoven fabric, a polyolefin film, a polyester film, etc. are mentioned, Among these, Paper materials are preferred, and glassine paper is particularly preferred from the viewpoints of excellent handleability (a point of moderate bending ease) and low cost.
- Weight average molecular weight (Mw) Diluted with tetrahydrofuran so that the solid content concentration of the synthetic polyisoprene contained in the polymer solution is 0.1% by weight, this solution was subjected to gel permeation chromatography analysis, and the weight in terms of standard polystyrene Average molecular weight (Mw) was calculated.
- the content ratio of each resin acid in the disproportionated rosin acid resin After the disproportionated rosin acid resin was converted to a methyl ester derivative by the diazomethane method, the derivatives were described in “Rosin acids,%” described in ASTM D803. According to the analysis method, the content ratio of abietic acid, neoabietic acid, parastrinic acid, dehydroabietic acid, and other components in the disproportionated rosin acid resin by performing gas chromatography analysis under the following conditions ( Unit:% by weight) was measured respectively.
- Analyzer Gas chromatograph (model “GC-15A”, manufactured by Shimadzu Corporation) Column: Capillary column URBON HR-SS-10, FS-bonded, 0.25mm ⁇ 50m Liquid phase: Cyanopropyl silicon Detector: FID Measurement conditions: oven temperature 195 ° C., injection temperature 250 ° C., detection temperature 250 ° C. Carrier gas: He
- Dip molded body tear strength Based on ASTM D624-00, the dip molded body was allowed to stand in a constant temperature and humidity chamber at 23 ° C. and 50% relative humidity for at least 24 hours, and then a dumbbell (trade name “Die C”, dumbbell company) And a test piece for tear strength measurement was produced. The test piece was pulled with a Tensilon universal testing machine (trade name “RTG-1210”, manufactured by A & D) at a tensile speed of 500 mm / min, and the tear strength (unit: N / mm) was measured.
- RTG-1210 manufactured by A & D
- Production Example 1 Production of disproportionated rosin acid resin (A-1) 350 parts of tall rosin melted at 170 ° C. in a four-necked flask with a capacity of 500 ml equipped with a cooling pipe, a nitrogen introducing pipe, a stopcock and a stirrer (content ratio of abietic acid is 43% by weight, content ratio of neoabietic acid is 22% by weight, the content of parastrinic acid is 16% by weight, the content of dehydroabietic acid is 10% by weight, the content of other components is 9% by weight, and the acid value is 169.0 mgKOH / g).
- Production Example 2 (Production of disproportionated rosin acid resin (A-2)) A disproportionated rosin acid resin (A-2) was obtained in the same manner as in Production Example 1, except that the reaction time of the disproportionation reaction was changed from 4 hours to 3 hours. With respect to the obtained disproportionated rosin acid resin (A-2), the content ratio of each resin acid in the disproportionated rosin acid resin was measured according to the above method. The content ratio of abietic acid was 1% by weight, the content ratio of dehydroabietic acid was 89% by weight, and the content ratios of other components were 10% by weight. The results are shown in Table 1.
- Production Example 3 (Production of disproportionated rosin acid resin (A-3)) A disproportionated rosin acid resin (A-3) was obtained in the same manner as in Production Example 1, except that the reaction time of the disproportionation reaction was changed from 4 hours to 2 hours. With respect to the obtained disproportionated rosin acid resin (A-3), the content ratio of each resin acid in the disproportionated rosin acid resin was measured according to the above method.
- the content ratio of abietic acid was 2% by weight
- the content ratio of neoabietic acid was 1% by weight
- the content ratio of parastrinic acid was 1% by weight
- the content ratio of dehydroabietic acid was 85% by weight
- the content ratios of other components were 11% by weight. The results are shown in Table 1.
- Production Example 4 (Production of disproportionated rosin acid resin (A'-4)) A disproportionated rosin acid resin (A′-4) was obtained in the same manner as in Production Example 1, except that the reaction time of the disproportionation reaction was changed from 4 hours to 30 minutes.
- the content ratio of each resin acid in the disproportionated rosin acid resin was measured according to the above method, and the content ratio of abietic acid was 10% by weight.
- the content ratio of neoabietic acid was 5% by weight
- the content ratio of parastrinic acid was 5% by weight
- the content ratio of dehydroabietic acid was 67% by weight
- the content ratios of other components were 13% by weight. The results are shown in Table 1.
- Production Example 5 (Production of disproportionated rosin acid resin (A′-5)) A disproportionated rosin acid resin was produced in the same manner as in Production Example 1, except that the reaction temperature of the disproportionation reaction was changed from 270 ° C. to 200 ° C., and the reaction time of the disproportionation reaction was changed from 4 hours to 1 minute. (A'-5) was obtained. With respect to the obtained disproportionated rosin acid resin (A′-5), the content ratio of each resin acid in the disproportionated rosin acid resin was measured in accordance with the above method, and the content ratio of abietic acid was 40% by weight.
- the content ratio of neoabietic acid was 20% by weight, the content ratio of parastrinic acid was 15% by weight, the content ratio of dehydroabietic acid was 13% by weight, and the content ratios of other components were 12% by weight.
- the results are shown in Table 1.
- Example 1 (Production of synthetic polyisoprene latex) A synthetic polyisoprene having a weight average molecular weight of 1,300,000 (trade name “NIPOL IR2200L”, manufactured by Nippon Zeon Co., Ltd., isoprene homopolymer, cis bond unit amount 98%) is mixed with cyclohexane, and the temperature is stirred. Was heated to 60 ° C. and dissolved to obtain a cyclohexane solution (a) of synthetic polyisoprene having a viscosity of 12,000 mPa ⁇ s measured by a B-type viscometer and a solid content concentration of 8% by weight.
- a synthetic polyisoprene having a viscosity of 12,000 mPa ⁇ s measured by a B-type viscometer and a solid content concentration of 8% by weight.
- the disproportionated rosin acid resin (A-1) obtained in Production Example 1 was neutralized with an aqueous potassium hydroxide solution, and used as a rosin surfactant, rosin acid having a concentration of 30% by weight and pH 10.5.
- a potassium aqueous solution (b) was obtained.
- the cyclohexane solution (a) and the potassium rosin acid aqueous solution (b) are mixed at a weight ratio of 1: 1.5 (2 parts of rosin potassium salt with respect to 100 parts of synthetic polyisoprene).
- the product name “Multiline Mixer MS26-MMR-5.5L” (Satake Chemical Machinery Co., Ltd.) is used for mixing, followed by the product name “Milder MDN310” (manufactured by Taiheiyo Kiko Co., Ltd.).
- emulsified at a rotational speed of 4100 rpm to obtain an emulsified liquid (c).
- the total feed flow rate of the cyclohexane solution (a) and the potassium rosinate aqueous solution (b) was 2,000 kg / hr, the temperature was 60 ° C., and the back pressure (gauge pressure) was 0.5 MPa.
- the emulsion (c) was heated to 80 ° C. under a reduced pressure of ⁇ 0.01 to ⁇ 0.09 MPa (gauge pressure) to distill off the cyclohexane, and an aqueous dispersion (d) of synthetic polyisoprene was obtained. Obtained.
- an antifoaming agent (trade name “SM5515”, manufactured by Toray Dow Corning Co., Ltd.) was continuously added while spraying so that the amount was 300 ppm by weight with respect to the synthetic polyisoprene in the emulsion (c).
- an aqueous dispersion (d) was obtained.
- the emulsified liquid (c) is adjusted to 70% by volume or less of the tank volume, and a three-stage inclined paddle blade is used as a stirring blade at a rotational speed of 60 rpm. Slow stirring was performed.
- the obtained aqueous dispersion (d) is centrifuged at 4,000 to 5,000 G using a continuous centrifuge (trade name “SRG510”, manufactured by Alfa Laval) to obtain a solid as a light liquid.
- a synthetic polyisoprene latex (e) having a partial concentration of 56% by weight was obtained.
- the conditions for the centrifugation are as follows: the solid content concentration of the aqueous dispersion (d) before centrifugation is 10% by weight, the flow rate during continuous centrifugation is 1300 kg / hr, and the back pressure of the centrifuge (gauge pressure). Was set to 1.5 MPa.
- the obtained synthetic polyisoprene latex (e) has a solid content concentration of 56% by weight, a volume average particle size of 1.0 ⁇ m, a pH of 10, a viscosity measured by a B-type viscometer of 120 mPa ⁇ s, and the above potassium rosinate
- the content ratio of the disproportionated rosin acid resin (A-1) derived from the aqueous solution (b) was 3.0 parts per 100 parts of the synthetic polyisoprene. Aggregates in the synthetic polyisoprene latex (e) were not observed, and the amount of residual metals (total content of aluminum atoms and titanium atoms) in the synthetic polyisoprene latex (e) was 250 ppm by weight.
- the latex composition (f) is dip-molded in a ceramic mold pre-applied with calcium nitrate, washed with distilled water at 60 ⁇ 1.0 ° C for 5 minutes, and heated in an oven at 120 ° C for 25 minutes. By sulphating, a ceramic mold coated with a film was obtained. Then, talc was apply
- Example 2 Latex composition in the same manner as in Example 1 except that the disproportionated rosin acid resin (A-2) obtained in Production Example 2 was used in place of the disproportionated rosin acid resin (A-1). And a dip-molded body were prepared and evaluated in the same manner. The results are shown in Table 1.
- Example 3 Latex composition in the same manner as in Example 1 except that the disproportionated rosin acid resin (A-3) obtained in Production Example 3 was used instead of the disproportionated rosin acid resin (A-1). And a dip-molded body were prepared and evaluated in the same manner. The results are shown in Table 1.
- Comparative Example 1 Latex composition in the same manner as in Example 1 except that the disproportionated rosin acid resin (A′-4) obtained in Production Example 4 was used instead of the disproportionated rosin acid resin (A-1). The product was prepared and the dip-molded body was produced, and evaluated in the same manner. The results are shown in Table 1.
- Comparative Example 2 Latex composition in the same manner as in Example 1 except that the disproportionated rosin acid resin (A′-5) obtained in Production Example 5 was used in place of the disproportionated rosin acid resin (A-1). The product was prepared and the dip-molded body was produced, and evaluated in the same manner. The results are shown in Table 1.
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Abstract
Description
本発明の重合体ラテックスの製造方法では、アニオン重合により重合することにより前記合成ポリイソプレンおよび/または前記スチレン-イソプレン-スチレンブロック共重合体の重合体溶液を得て、前記重合体溶液を、凝固を経ずに、前記ロジンおよび/またはロジンの金属塩の水溶液を用いて直接乳化して前記乳化液を得ることが好ましい。
本発明の重合体ラテックスの製造方法では、前記重合体ラテックス中における前記ロジンおよび/またはロジンの金属塩の合計の含有割合が、前記重合体ラテックス中に含まれる前記合成ポリイソプレンおよび/または前記スチレン-イソプレン-スチレンブロック共重合体の合計100重量部に対して、1.5重量部超であることが好ましい。
本発明の重合体ラテックスの製造方法では、前記ロジンおよび/または前記ロジンの金属塩として、デヒドロアビエチン酸の含有割合が70~100重量%であるものを用いることが好ましい。
さらに、本発明によれば、上記の製造方法により得られた重合体ラテックスを第1のシート基材および/または第2のシート基材上に塗布して塗膜を形成し、前記塗膜により第1のシート基材の少なくとも一部と第2のシート基材の少なくとも一部とを接着積層する、前記第1のシート基材と前記第2のシート基材との間に被包装物を収容可能な包装構造体の製造方法が提供される。
合成ポリイソプレンの重合体溶液に含まれる合成ポリイソプレンは、イソプレンの単独重合体であってもよいし、イソプレンと共重合可能な他のエチレン性不飽和単量体とを共重合したものであってもよい。合成ポリイソプレン中のイソプレン単位の含有量は、柔軟で、引張強度に優れるディップ成形体などの膜成形体が得られやすいことから、全単量体単位に対して、好ましくは70重量%以上、より好ましくは90重量%以上、さらに好ましくは95重量%以上、特に好ましくは100重量%(イソプレンの単独重合体)である。
スチレン-イソプレン-スチレンブロック共重合体の重合体溶液に含まれる、スチレン-イソプレン-スチレンブロック共重合体(SIS)は、スチレンとイソプレンとのブロック共重合体である(「S」はスチレンブロック、「I」はイソプレンブロックをそれぞれ表す。)。SIS中のスチレン単位とイソプレン単位の含有割合は、「スチレン単位:イソプレン単位」の重量比で、通常1:99~90:10、好ましくは3:97~70:30、より好ましくは5:95~50:50、さらに好ましくは10:90~30:70の範囲である。
本発明の重合体ラテックスの製造方法においては、上記した配位重合あるいはアニオン重合により得られた合成ポリイソプレンおよび/またはSISの重合体溶液を用いて、たとえば、以下の方法により重合体ラテックスを製造することができる。すなわち、(1)配位重合あるいはアニオン重合により得られた合成ポリイソプレンおよび/またはSISの重合体溶液から、一度凝固させた合成ポリイソプレンおよび/またはSISを得て、これを有機溶媒に溶解または微分散させることで、合成ポリイソプレンおよび/またはSISの重合体溶液(溶液または微細懸濁液)を得て、得られた合成ポリイソプレンおよび/またはSISの重合体溶液を、乳化剤としてのロジンおよび/またはロジンの金属塩の存在下で、水中で乳化させることで重合体ラテックスを製造する方法、(2)配位重合あるいはアニオン重合により得られた合成ポリイソプレンの重合体溶液を、凝固を経ずに、乳化剤としてのロジンおよび/またはロジンの金属塩の存在下で、水中で直接乳化させることで重合体ラテックスを製造する方法が挙げられる。上記(1)、(2)の方法いずれを採用してもよいが、アニオン重合により得られた合成ポリイソプレンおよび/またはSISを用いる場合には、凝固等による熱履歴を低減でき、これにより、得られるディップ成形体を、引張強度および伸びにより優れるものとすることができるという観点より、上記(2)の方法が好ましい。
本発明のラテックス組成物の製造方法は、上述した本発明の重合体ラテックスに、加硫剤を添加する工程を備えるものである。
加硫促進剤としては、ディップ成形を得る方法において通常用いられるものが使用でき、たとえば、ジエチルジチオカルバミン酸、ジブチルジチオカルバミン酸、ジ-2-エチルヘキシルジチオカルバミン酸、ジシクロヘキシルジチオカルバミン酸、ジフェニルジチオカルバミン酸、ジベンジルジチオカルバミン酸などのジチオカルバミン酸類およびそれらの亜鉛塩;2-メルカプトベンゾチアゾール、2-メルカプトベンゾチアゾール亜鉛、2-メルカプトチアゾリン、ジベンゾチアジル・ジスルフィド、2-(2,4-ジニトロフェニルチオ)ベンゾチアゾール、2-(N,N-ジエチルチオ・カルバイルチオ)ベンゾチアゾール、2-(2,6-ジメチル-4-モルホリノチオ)ベンゾチアゾール、2-(4′-モルホリノ・ジチオ)ベンゾチアゾール、4-モルホニリル-2-ベンゾチアジル・ジスルフィド、1,3-ビス(2-ベンゾチアジル・メルカプトメチル)ユリアなどが挙げられるが、ジエチルジチオカルバミン酸亜鉛、2ジブチルジチオカルバミン酸亜鉛、2-メルカプトベンゾチアゾール亜鉛が好ましい。加硫促進剤は、1種単独で、あるいは2種以上を組み合わせて用いることができる。
酸化亜鉛の含有量は、特に限定されないが、ラテックス中に含まれる合成ポリイソプレンおよびSISの合計100重量部に対して、好ましくは0.1~5重量部、より好ましくは0.2~2重量部である。酸化亜鉛の含有量を上記範囲とすることにより、乳化安定性を良好なものとしながら、得られるディップ成形体の引張強度をより高めることができる。
そして、前架橋した後、ディップ成形に供されるまで、好ましくは10~30℃の温度で貯蔵することが好ましい。高温のまま貯蔵すると、得られるディップ成形体の引張強度が低下する場合がある。
本発明のディップ成形体の製造方法は、上記のラテックス組成物をディップ成形する工程を備える。ディップ成形は、ラテックス組成物に型を浸漬し、型の表面に当該組成物を沈着させ、次に型を当該組成物から引き上げ、その後、型の表面に沈着した当該組成物を乾燥させる方法である。なお、ラテックス組成物に浸漬される前の型は予熱しておいてもよい。また、型をラテックス組成物に浸漬する前、または、型をラテックス組成物から引き上げた後、必要に応じて凝固剤を使用できる。
架橋時の加熱条件は、特に限定されないが、好ましくは60~150℃、より好ましくは100~130℃の加熱温度で、好ましくは10~120分の加熱時間である。
加熱の方法は、特に限定されないが、オーブンの中で温風で加熱する方法、赤外線を照射して加熱する方法などがある。
本発明の包装構造体の製造方法は、上記の重合体ラテックスを第1のシート基材および/または第2のシート基材上に塗布して塗膜を形成し、該塗膜により第1のシート基材の少なくとも一部と第2のシート基材の少なくとも一部とを接着積層する工程を備える。本発明の製造方法により得られる包装構造体は、重合体ラテックスを塗布した第1のシート基材および第2のシート基材を接着積層してなり、被包装物を収容可能な構造を示す。具体的には、包装構造体においては、第1のシート基材および第2のシート基材は、重合体ラテックスが塗布された面(ラテックス塗布面)が対向するようにして、必要に応じて被包装物を挟み、第1のシート基材および第2のシート基材のラテックス塗布面同士が互いに接触した状態で、押圧することにより、第1のシート基材と第2のシート基材とが互いに接着し、これにより、被包装物を包装可能な構造となっている。被包装物としては、特に限定されないが、たとえば、絆創膏等の医療品のように、滅菌をすることが望まれる各種被包装物が挙げられる。第1のシート基材および第2のシート基材としては、特に限定されないが、たとえば、グラシン紙等の紙材、高密度ポリエチレン不織布、ポリオレフィンフィルム、ポリエステルフィルム等が挙げられ、これらのなかでも、取り扱い性が優れている点(適度な折れ曲がり易さを有している点)および安価であるという点から、紙材が好ましく、グラシン紙が特に好ましい。
重合体溶液に含まれる、合成ポリイソプレンの固形分濃度が0.1重量%となるように、テトラヒドロフランで希釈し、この溶液について、ゲル・パーミーエーション・クロマトグラフィー分析を行い、標準ポリスチレン換算の重量平均分子量(Mw)を算出した。
アルミ皿(重量:X1)に試料2gを精秤し(重量:X2)、これを105℃の熱風乾燥器内で2時間乾燥させた。次いで、デシケーター内で冷却した後、アルミ皿ごと重量を測定し(重量:X3)、下記の計算式にしたがって、固形分濃度を算出した。
固形分濃度(重量%)=(X3-X1)×100/X2
不均化ロジン酸樹脂を、ジアゾメタン法によりメチルエステル体の誘導体とした後、誘導体について、ASTM D803に記載されている「Rosin acids,%」の分析方法にしたがい、下記条件にてガスクロマトグラフィー分析を行うことにより、不均化ロジン酸樹脂中における、アビエチン酸、ネオアビエチン酸、パラストリン酸、デヒドロアビエチン酸、およびその他の成分の含有割合(単位:重量%)を、それぞれ測定した。
分析装置:ガスクロマトグラフ(型式「GC-15A」、島津製作所社製)
カラム :キャピラリーカラム URBON HR-SS-10、
FS-bonded、 0.25mm×50m
液相:シアノプロピルシリコン
検出器 :FID
測定条件:オーブン温度195℃、インジェクション温度250℃、検出温度250℃
キャリアーガス:He
合成ポリイソプレンラテックス0.1gに水2mlを加え、アセトニトリルで10mlに希釈した。得られた液体をよく振とうさせ、ゴム分を凝固させた。その後水層を0.2μmのディスクフィルタで濾過した。この液体を高速液体クロマトグラフィーで分析し、合成ポリイソプレン100部に対する、ロジン系界面活性剤の含有割合(単位:重量部)を算出した。
ASTM D412に基づいて、ディップ成形体を、ダンベル(商品名「スーパーダンベル(型式:SDMK-100C)」、ダンベル社製)で打ち抜き、引張強度測定用試験片を作製した。当該試験片をテンシロン万能試験機(商品名「RTG-1210」、オリエンテック社製)で引張速度500mm/minで引っ張り、破断直前の引張強度(単位:MPa)を測定した。
ASTM D624-00に基づいて、ディップ成形体を、23℃、相対湿度50%の恒温恒湿室で24時間以上放置した後、ダンベル(商品名「Die C」、ダンベル社製)で打ち抜き、引裂強度測定用の試験片を作製した。当該試験片をテンシロン万能試験機(商品名「RTG-1210」、A&D社製)で引張速度500mm/minで引っ張り、引裂強度(単位:N/mm)を測定した。
冷却管、窒素導入管、活栓および撹拌装置を備えた容量500mlの四つ口フラスコに、170℃として溶融させたトールロジン350部(アビエチン酸の含有割合が43重量%、ネオアビエチン酸の含有割合が22重量%、パラストリン酸の含有割合が16重量%、デヒドロアビエチン酸の含有割合が10重量%、その他の成分の含有割合が9重量%、酸価169.0mgKOH/g)を仕込み、窒素ガスで置換後、不均化触媒として、パラジウム-カーボン(パラジウム5重量%)0.25部を加え、温度270℃まで加熱し、反応温度270℃、反応時間4時間の条件で、不均化反応を行った。次いで、不均化反応によって得られた反応液を、200℃まで冷却し、濾過器にて不均化触媒を除去することで、不均化ロジン酸樹脂(A-1)を得た。得られた不均化ロジン酸樹脂(A-1)について、上記方法にしたがって、不均化ロジン酸樹脂中の各樹脂酸の含有割合を測定したところ、アビエチン酸、ネオアビエチン酸およびパラストリン酸は検出されず、デヒドロアビエチン酸の含有割合が90重量%、その他の成分の含有割合が10重量%であった。結果を表1に示す。
不均化反応の反応時間を、4時間から3時間に変更した以外は、製造例1と同様にして、不均化ロジン酸樹脂(A-2)を得た。得られた不均化ロジン酸樹脂(A-2)について、上記方法にしたがって、不均化ロジン酸樹脂中の各樹脂酸の含有割合を測定したところ、ネオアビエチン酸およびパラストリン酸は検出されず、アビエチン酸の含有割合が1重量%、デヒドロアビエチン酸の含有割合が89重量%、その他の成分の含有割合が10重量%であった。結果を表1に示す。
不均化反応の反応時間を、4時間から2時間に変更した以外は、製造例1と同様にして、不均化ロジン酸樹脂(A-3)を得た。得られた不均化ロジン酸樹脂(A-3)について、上記方法にしたがって、不均化ロジン酸樹脂中の各樹脂酸の含有割合を測定したところ、アビエチン酸の含有割合が2重量%、ネオアビエチン酸の含有割合が1重量%、パラストリン酸の含有割合が1重量%、デヒドロアビエチン酸の含有割合が85重量%、その他の成分の含有割合が11重量%であった。結果を表1に示す。
不均化反応の反応時間を、4時間から30分間に変更した以外は、製造例1と同様にして、不均化ロジン酸樹脂(A’-4)を得た。得られた不均化ロジン酸樹脂(A’-4)について、上記方法にしたがって、不均化ロジン酸樹脂中の各樹脂酸の含有割合を測定したところ、アビエチン酸の含有割合が10重量%、ネオアビエチン酸の含有割合が5重量%、パラストリン酸の含有割合が5重量%、デヒドロアビエチン酸の含有割合が67重量%、その他の成分の含有割合が13重量%であった。結果を表1に示す。
不均化反応の反応温度を270℃から200℃に、不均化反応の反応時間を4時間から1分間に、それぞれ変更した以外は、製造例1と同様にして、不均化ロジン酸樹脂(A’-5)を得た。得られた不均化ロジン酸樹脂(A’-5)について、上記方法にしたがって、不均化ロジン酸樹脂中の各樹脂酸の含有割合を測定したところ、アビエチン酸の含有割合が40重量%、ネオアビエチン酸の含有割合が20重量%、パラストリン酸の含有割合が15重量%、デヒドロアビエチン酸の含有割合が13重量%、その他の成分の含有割合が12重量%であった。結果を表1に示す。
(合成ポリイソプレンラテックスの製造)
重量平均分子量が1,300,000である合成ポリイソプレン(商品名「NIPOL IR2200L」、日本ゼオン社製、イソプレンの単独重合体、シス結合単位量98%)をシクロヘキサンと混合し、攪拌しながら温度を60℃に昇温して溶解させることで、B形粘度計で測定した粘度が12,000mPa・s、固形分濃度が8重量%である合成ポリイソプレンのシクロヘキサン溶液(a)を得た。
次いで、合成ポリイソプレンラテックス(e)中の合成ポリイソプレン100部に対して、1.0部のドデシルベンゼンスルホン酸ナトリウム添加した後、蒸留水にて固形分濃度40重量%に希釈した。さらに、合成ポリイソプレンラテックス(e)中の合成ポリイソプレン100部に対して、それぞれ固形分換算で、有効成分50%の蒸留水分散体としてコロイド硫黄1.5部、酸化亜鉛1.5部、ジエチルジチオカルバミン酸亜鉛0.3部、ジブチルジチオカルバミン酸亜鉛0.5部、2-メルカプトベンゾチアゾール亜鉛0.7部となるように、各配合剤の水分散液を添加した。その後、合成ポリイソプレンラテックス(e)中の合成ポリイソプレン100部に対して、老化防止剤(商品名「Wingstay L」、グッドイヤー社製)の水分散体を有効成分で2部添加して、ラテックス組成物(f)を得た。その後、得られたラテックス組成物(f)を、攪拌機で撹拌しながら設定温度30±0.5℃の恒温水槽にて48時間熟成した。
ラテックス組成物(f)を、あらかじめ硝酸カルシウムを塗布したセラミック製モールドにてディップ成形した後、60±1.0℃の蒸留水で5分間洗浄し、120℃のオーブンで25分間加熱して加硫することで、フィルムで被覆されたセラミック製モールドを得た。その後、得られたフィルムにタルクを塗布し、フィルム同士の融着を防いだ状態で、フィルムをセラミック製モールドから離型することで、ディップ成形体を得た。そして、得られたディップ成形体を用いて、上記方法にしたがって、引張強度および引裂強度の各測定を行った。結果を表1に示す。
不均化ロジン酸樹脂(A-1)に代えて、製造例2で得られた不均化ロジン酸樹脂(A-2)を使用した以外は、実施例1と同様にして、ラテックス組成物の調製およびディップ成形体の製造を行い、同様にして評価を行った。結果を表1に示す。
不均化ロジン酸樹脂(A-1)に代えて、製造例3で得られた不均化ロジン酸樹脂(A-3)を使用した以外は、実施例1と同様にして、ラテックス組成物の調製およびディップ成形体の製造を行い、同様にして評価を行った。結果を表1に示す。
不均化ロジン酸樹脂(A-1)に代えて、製造例4で得られた不均化ロジン酸樹脂(A’-4)を使用した以外は、実施例1と同様にして、ラテックス組成物の調製およびディップ成形体の製造を行い、同様にして評価を行った。結果を表1に示す。
不均化ロジン酸樹脂(A-1)に代えて、製造例5で得られた不均化ロジン酸樹脂(A’-5)を使用した以外は、実施例1と同様にして、ラテックス組成物の調製およびディップ成形体の製造を行い、同様にして評価を行った。結果を表1に示す。
Claims (8)
- 合成ポリイソプレンおよび/またはスチレン-イソプレン-スチレンブロック共重合体の重合体溶液を、ロジンおよび/またはロジンの金属塩の存在下に、水中で乳化させることで、乳化液を得る工程を備え、
前記ロジンおよび/または前記ロジンの金属塩として、アビエチン酸、ネオアビエチン酸およびパラストリン酸、ならびにこれらの塩の合計の含有割合が5重量%以下であるものを用いる重合体ラテックスの製造方法。 - 前記合成ポリイソプレンおよび/または前記スチレン-イソプレン-スチレンブロック共重合体として、アニオン重合により重合して得られたものを用いる請求項1に記載の重合体ラテックスの製造方法。
- アニオン重合により重合することにより前記合成ポリイソプレンおよび/または前記スチレン-イソプレン-スチレンブロック共重合体の重合体溶液を得て、前記重合体溶液を、凝固を経ずに、前記ロジンおよび/またはロジンの金属塩の水溶液を用いて直接乳化して前記乳化液を得る請求項2に記載の重合体ラテックスの製造方法。
- 前記重合体ラテックス中における前記ロジンおよび/またはロジンの金属塩の合計の含有割合が、前記重合体ラテックス中に含まれる前記合成ポリイソプレンおよび/または前記スチレン-イソプレン-スチレンブロック共重合体の合計100重量部に対して、1.5重量部超である請求項1~3のいずれかに記載の重合体ラテックスの製造方法。
- 前記ロジンおよび/または前記ロジンの金属塩として、デヒドロアビエチン酸の含有割合が70~100重量%であるものを用いる請求項1~4のいずれかに記載の重合体ラテックスの製造方法。
- 請求項1~5のいずれかに記載の製造方法により得られた重合体ラテックスに、加硫剤を添加する工程を備えるラテックス組成物の製造方法。
- 請求項6に記載の製造方法により得られたラテックス組成物をディップ成形する工程を備えるディップ成形体の製造方法。
- 請求項1~5のいずれかに記載の製造方法により得られた重合体ラテックスを第1のシート基材および/または第2のシート基材上に塗布して塗膜を形成し、前記塗膜により第1のシート基材の少なくとも一部と第2のシート基材の少なくとも一部とを接着積層する、前記第1のシート基材と前記第2のシート基材との間に被包装物を収容可能な包装構造体の製造方法。
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EP17876637.4A EP3549973A4 (en) | 2016-11-30 | 2017-11-02 | POLYMER LATEX PRODUCTION PROCESS |
CN201780067804.5A CN109890875A (zh) | 2016-11-30 | 2017-11-02 | 聚合物胶乳的制备方法 |
JP2018553733A JP7036028B2 (ja) | 2016-11-30 | 2017-11-02 | 重合体ラテックスの製造方法 |
BR112019011002-0A BR112019011002B1 (pt) | 2016-11-30 | 2017-11-02 | Métodos para produzir um látex de polímero, uma composição de látex, um artigo moldado por imersão e uma estrutura de embalagem |
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