WO2017069433A1 - 딥 성형용 라텍스 조성물 및 이로부터 제조된 성형품 - Google Patents
딥 성형용 라텍스 조성물 및 이로부터 제조된 성형품 Download PDFInfo
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- WO2017069433A1 WO2017069433A1 PCT/KR2016/011126 KR2016011126W WO2017069433A1 WO 2017069433 A1 WO2017069433 A1 WO 2017069433A1 KR 2016011126 W KR2016011126 W KR 2016011126W WO 2017069433 A1 WO2017069433 A1 WO 2017069433A1
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- dip molding
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
- C08L9/04—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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/02—Direct processing of dispersions, e.g. latex, to articles
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
- C08L33/24—Homopolymers or copolymers of amides or imides
- C08L33/26—Homopolymers or copolymers of acrylamide or methacrylamide
-
- 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
- C08J2309/00—Characterised by the use of homopolymers or copolymers of conjugated diene hydrocarbons
- C08J2309/02—Copolymers with acrylonitrile
- C08J2309/04—Latex
-
- 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
- C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
- C08J2433/24—Homopolymers or copolymers of amides or imides
- C08J2433/26—Homopolymers or copolymers of acrylamide or methacrylamide
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0025—Crosslinking or vulcanising agents; including accelerators
Definitions
- the present invention relates to a latex composition for dip molding and a molded article prepared therefrom that can produce a dip molded article having a smooth synerisis and excellent tensile strength.
- Rubber gloves are used in a wide range of fields such as household, food, electronics, and medical fields. Although rubber gloves made by deep-molding natural rubber latex have been used a lot, proteins contained in natural rubber have caused problems for some users due to allergic reactions such as pain or rash.
- a latex composition in which sulfur and a vulcanization accelerator are mixed with a carboxylic acid-modified nitrile copolymer latex such as an acrylic acid-acrylonitrile-butadiene copolymer latex, which does not cause an allergic reaction, is dip. Molded gloves were used a lot.
- the carboxylic acid-modified nitrile copolymer latex is composed of acrylic acid, acrylonitrile and butadiene in a certain ratio, that is, in the form of organic acid segments. Recently, a crosslinking agent is added to the latex to obtain a tensile strength required as rubber gloves. There have been attempts to secure physical properties such as durability.
- WO 2011/068394 proposes a method of carboxylating acrylonitrile and adding a metal oxide such as zinc oxide or other metal salt to crosslinking by ionic bonding therebetween.
- a metal oxide such as zinc oxide or other metal salt
- crosslinking alone does not satisfy a sufficient level of tensile strength and durability, and a new problem arises that some metals remain in the final molded product and cause skin irritation with deterioration of physical properties.
- the company aims to increase the speed of the production line to produce thin but not tearing gloves to increase productivity.
- the present inventors conducted various studies to solve the above problems, and as a material capable of crosslinking through hydrogen bonding, water-soluble polymer poly ( N -isopropylacrylamide) or a copolymer thereof was selected and mixed with latex. Synthesis time increases when the dip molding, and confirmed that the physical properties of the manufactured molded article is improved to complete the present invention.
- Another object of the present invention is to provide a molded article prepared from the latex composition for dip molding.
- Another object of the present invention is to provide a method for producing a molded article using the latex composition for dip molding.
- the present invention is carboxylic acid-modified nitrile copolymer latex; And poly ( N -isopropylacrylamide) or a copolymer thereof. Provides a latex composition for dip molding.
- the present invention also provides a dip molded product prepared by dip molding the latex composition for dip molding.
- the present invention comprises the steps of a) applying a coagulant solution to the mold and drying; b) forming a dip molding layer by applying a latex composition for dip molding to a mold to which a coagulant is applied; c) crosslinking the dip molding layer; And d) peeling off the crosslinked dip molding layer from the mold to obtain a dip molded article.
- the dip molding latex composition provides a method for producing a dip molded article, which is a latex composition for dip molding as described above.
- the latex composition for dip molding according to the present invention is excellent in workability due to the gentle syneresis during dip molding, and enables the production of dip molded articles that are not easily torn even in a thin thickness due to high tensile strength.
- poly ( N -isopropylacrylamide) or a copolymer thereof mixed with latex and having a carboxylic acid functional group and a hydrogen bondable functional group is mixed with a latex for dip molding.
- the latex composition for dip molding according to the present invention comprises a carboxylic acid-modified nitrile copolymer latex; And poly ( N -isopropylacrylamide) or copolymers thereof.
- the carboxylic acid-modified nitrile copolymer latex is prepared by emulsion polymerization by adding an emulsifier, a reactive compound, a polymerization initiator, a molecular weight regulator and other additives to the monomer.
- the monomer is composed of a conjugated diene monomer, an ethylenically unsaturated nitrile monomer, an ethylenically unsaturated acid monomer and an unsaturated ethylenic monomer copolymerizable with these.
- conjugated diene monomers include 1,3-butadiene, 2,3-dimethyl-1,3-butadiene and 2-ethyl-1 At least one selected from the group consisting of, 3-butadiene, 1,3-pentadiene and isoprene, among which 1,3-butadiene and isoprene are preferred, and 1,3-butadiene is most preferably used.
- the conjugated diene monomer is included 40 to 89% by weight, preferably 45 to 80% by weight, more preferably 50 to 78% by weight of the total monomer constituting the carboxylic acid-modified nitrile copolymer.
- the conjugated diene monomer content is less than 40% by weight, the dip molded product becomes hard and the wear is poor.
- the conjugated diene monomer content exceeds 89% by weight the oil resistance of the dip molded product is deteriorated and the tensile strength is lowered.
- the ethylenically unsaturated nitrile monomer is acrylonitrile, methacrylonitrile, fumaronitrile, ⁇ -chloronitrile and ⁇ -cyano ethyl acryl At least one selected from the group consisting of ronitrile, of which acrylonitrile and methacrylonitrile are preferred, and acrylonitrile is most preferably used.
- the ethylenically unsaturated nitrile monomer is included in 10 to 50% by weight, preferably 15 to 45% by weight, more preferably 20 to 40% by weight of the total monomers constituting the carboxylic acid-modified nitrile copolymer. If the ethylenically unsaturated nitrile monomer content is less than 10% by weight, the oil resistance of the dip molded product is poor, the tensile strength is lowered, and if it is more than 50% by weight, the dip molded product is hard and the wear feeling is poor.
- the ethylenically unsaturated acid monomer includes an ethylenically unsaturated acid monomer containing at least one acidic group selected from the group consisting of a carboxyl group, a sulfonic acid group and an acid anhydride group. to be.
- the ethylenically unsaturated acid monomers include, for example, ethylenically unsaturated carboxylic acid monomers such as acrylic acid, methacrylic acid, itaconic acid, maleic acid and fumaric acid; Polycarboxylic acid anhydrides such as maleic anhydride and citraconic anhydride; Ethylenically unsaturated sulfonic acid monomers such as styrene sulfonic acid; And ethylenically unsaturated polycarboxylic acid partial ester monomers such as monobutyl fumarate, monobutyl maleate, and mono-2-hydroxypropyl maleate. Of these, methacrylic acid is preferred.
- Such ethylenically unsaturated acid monomers may be used in the form of alkali metal salts or ammonium salts.
- the ethylenically unsaturated acid monomer is included in 0.1 to 10% by weight, preferably 0.5 to 9% by weight, more preferably 1 to 8% by weight of the total monomers constituting the carboxylic acid-modified nitrile copolymer. If the content of the ethylenically unsaturated acid monomer is less than 0.1% by weight, the dip molded article is lowered in tensile strength. If the content of the ethylenically unsaturated acid monomer is more than 10% by weight, the dip molded article is hardened and wear is poor.
- the carboxylic acid-modified nitrile copolymer according to the present invention may optionally further include other ethylenically unsaturated monomers copolymerizable with the ethylenically unsaturated nitrile monomer and ethylenically unsaturated acid monomer.
- the copolymerizable ethylenically unsaturated monomers include vinyl aromatic monomers selected from the group consisting of styrene, alkyl styrene and vinyl naphthalene; Fluoroalkyl vinyl ethers such as fluoro ethyl vinyl ether; (Meth) acrylamide, N -methylol (meth) acrylamide, N, N -dimethylol (meth) acrylamide, N-methoxy methyl (meth) acrylamide and N -propoxy methyl (meth) acrylamide Ethylenically unsaturated amide monomers selected from the group consisting of; Non-conjugated diene monomers such as vinyl pyridine, vinyl norbornene, dicyclopentadiene and 1,4-hexadiene; Methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhex
- the amount of the ethylenically unsaturated nitrile monomer and other ethylenically unsaturated monomer copolymerizable with the ethylenically unsaturated acid monomer may be used within 20% by weight of the total monomers constituting the carboxylic acid-modified nitrile copolymer, and more than 20% by weight. There is a poor balance between soft fit and tensile strength.
- the carboxylic acid-modified nitrile copolymer latex of the present invention can be prepared by emulsion polymerization by adding an emulsifier, a polymerization initiator, a molecular weight regulator, etc. to the monomers constituting the carboxylic acid-modified nitrile copolymer.
- anionic surfactant a nonionic surfactant, cationic surfactant, an amphoteric surfactant, etc.
- anionic surfactants selected from the group consisting of alkylbenzene sulfonates, aliphatic sulfonates, sulfuric ester salts of higher alcohols, ⁇ -olefin sulfonates and alkyl ether sulfate ester salts can be particularly preferably used.
- the amount of the emulsifier is preferably 0.3 to 10 parts by weight, more preferably 0.8 to 8 parts by weight, most preferably 1.5 to 6 parts by weight based on 100 parts by weight of the monomer constituting the carboxylic acid-modified nitrile copolymer. Used. If the amount of the emulsifier is less than 0.3 parts by weight, the stability during polymerization is lowered. When the amount of the emulsifier is more than 10 parts by weight, foaming increases, making it difficult to manufacture dip molded products.
- a radical initiator can be used.
- inorganic peroxides such as sodium persulfate, potassium persulfate, ammonium persulfate, potassium perphosphate, hydrogen peroxide; t-butyl peroxide, cumene hydroperoxide, p-mentanehydro peroxide, di-t-butyl peroxide, t-butylcumyl peroxide, acetyl peroxide, isobutyl peroxide, octanoyl peroxide, dibenzoyl peroxide Organic peroxides such as oxides, 3,5,5-trimethylhexanol peroxide and t-butyl peroxy isobutylate; At least one selected from the group consisting of azobis isobutyronitrile, azobis-2,4-dimethylvaleronitrile, azobiscyclohexane carbonitrile, and
- the amount of the polymerization initiator is contained in an amount of 0.01 to 2 parts by weight, preferably 0.02 to 1.5 parts by weight, based on 100 parts by weight of the total monomers constituting the carboxylic acid-modified nitrile copolymer. If the amount of the polymerization initiator is less than 0.01 parts by weight, the polymerization rate is lowered to make the final product difficult. If the amount is more than 2 parts by weight, the polymerization rate is too fast to control the polymerization.
- the activating agent may be selected from the group consisting of sodium formaldehyde sulfoxylate, sodium ethylenediamine tetraacetate, ferrous sulfate, dextrose, sodium pyrrolate and sodium sulfite.
- mercaptans such as (alpha) -methylstyrene dimer, t-dodecyl mercaptan, n-dodecyl mercaptan, octyl mercaptan; Halogenated hydrocarbons such as carbon tetrachloride, methylene chloride and methylene bromide; Sulfur-containing compounds such as tetraethyl thiuram disulfide, dipentamethylene thiuram disulfide, and diisopropylquixanthogen disulfide; and the like can be given.
- molecular weight modifiers may be used alone or in combination of two or more thereof.
- mercaptans are preferable, and t-dodecyl mercaptan can be used more preferably.
- usage-amount of a molecular weight modifier varies with the kind, 0.1-2.0 weight part, Preferably it is 0.2-1.5 weight part, More preferably, 0.3 with respect to 100 weight part of all monomers which comprise the said carboxylic acid modified nitrile copolymer. To 1.0 part by weight. If the amount of the molecular weight regulator is less than 0.1 part by weight, the physical properties of the dip molded article is significantly lowered, and if it exceeds 2 parts by weight, there is a problem that the polymerization stability is lowered.
- subsidiary materials such as chelating agent, dispersing agent, pH adjusting agent, deoxygenating agent, particle size adjusting agent, anti-aging agent, oxygen scavenger and the like can be added.
- the method of adding the monomer mixture constituting the carboxylic acid-modified nitrile copolymer is not particularly limited, the method of introducing the monomer mixture into the polymerization reactor at once, the method of continuously introducing the monomer mixture into the polymerization reactor, and a part of the monomer mixture You may use what kind of methods of putting into a polymerization reactor and continuously supplying a remaining monomer to a polymerization reactor.
- the polymerization temperature at the time of the said emulsion polymerization is not specifically limited, Usually, it is 10-90 degreeC, Preferably it is 25-75 degreeC.
- the conversion rate at the time of stopping a polymerization reaction is 90% or more, Preferably it is 93% or more.
- the carboxylic acid-modified nitrile copolymer latex has a glass transition temperature of -50 to -15 ° C, preferably -45 to -20 ° C. If the glass transition temperature of the latex is less than the above range, the tensile strength is significantly lowered or the wearability is reduced due to the stickyness of the glove. On the contrary, if the glass transition temperature of the latex is higher than the above range, the dip molded product is cracked, which is not preferable.
- the carboxylic acid-modified nitrile copolymer latex has an average particle diameter of 90nm to 200nm. If the average particle diameter is less than the above range, the viscosity of the latex rises and the dip molded article becomes undesirably unfavorable. On the contrary, if the average particle diameter exceeds the above range, the time is increased when the latex is manufactured, the productivity decreases and the tension after the dip molded article is manufactured It is not preferable because the strength is lowered.
- the glass transition temperature can be adjusted according to the content of the conjugated diene monomer, the average particle diameter can be adjusted according to the type or content of the emulsifier.
- a specific polymer is used to prepare a dip molded product of the carboxylic acid-modified nitrile copolymer latex.
- Such a polymer includes a carboxylic acid functional group and a hydrogen bondable functional group in a molecular structure, and preferably may be poly ( N -isopropylacrylamide) or a copolymer thereof including a repeating unit represented by the following Chemical Formula 1.
- the stability of the latex increases the synergy time in the dip molding process to improve workability and productivity, and the tensile strength of the finally obtained molded product can be increased to secure an advantage of not tearing even if the thickness is thin.
- Poly ( N -isopropylacrylamide) copolymers are copolymerized with N -isopropylacrylamide monomers and other monomers having carboxylic acid functional groups in the molecular structure, wherein the carboxylic acid present in the copolymer also contains carboxylic acid and hydrogen in latex.
- the combination can achieve even more of the above mentioned advantages.
- the copolymerizable monomers that can be used are not limited in the present invention and may be any one including ethylenically unsaturated functional groups and carboxylic acids in the molecular structure, and may be typically ethylenically unsaturated carboxylic acid monomers, preferably acrylic acid and methacrylic.
- One selected from the group consisting of acid, itaconic acid, maleic acid, fumaric acid, and combinations thereof is possible, and more preferably methacrylic acid.
- the poly ( N -isopropylacrylamide) copolymer is greater than 0 and 20 mol% or less, preferably 0.5 to 15 mol, of an ethylenically unsaturated carboxylic acid monomer relative to 80 to less than 100 mol% of N -isopropylacrylamide monomers. %, More preferably copolymerized at a molar ratio of 5 to 12 mol%. Only when the copolymerization is within the mole% range, the synergy in the dip molding process is gentle, and the final obtained molded article has little stickiness and excellent tensile strength.
- the poly ( N -isopropylacrylamide) or copolymers thereof according to the present invention may limit the number average molecular weight and concentration in consideration of syneresis, workability, physical properties of the final molded article, and the like.
- the average molecular weight is 5,000 to 80,000 g / mol and has the form of an aqueous solution at a concentration of 0.5 to 15% by weight, 1 to 10% by weight, preferably 2 to 5% by weight.
- the latex composition for dip molding of the present invention is used in an amount of 0.1 to 10 parts by weight, preferably 0.5 to 5 parts by weight, and more preferably 1 to 5 parts by weight, based on 100 parts by weight of the carboxylic acid-modified nitrile copolymer latex. do. If the content of the poly ( N -isopropylacrylamide) or copolymer thereof is less than the above range, the thickness of the final molded article is thin. On the contrary, if the above range is exceeded, the synergy is drastically lowered and the stability of the latex is lowered. Not preferred.
- the latex composition for dip molding according to the present invention can ensure an excellent tensile strength characteristics even if the molded article is manufactured to a thickness of several tens to hundreds of microns.
- the rubber gloves used for industrial or research use have an advantage that the thinner the thickness, the better the fingertips and the easier to perform fine work.
- the synergy is short and the workability is deteriorated, resulting in a high defect rate during product manufacturing and a problem in that the final molded product is torn.
- the latex composition for dip molding according to the present invention enables the production of molded articles having a thickness of several hundred microns or less.
- rubber gloves not only can be manufactured in a thickness suitable for fine work, but also have excellent tensile strength of the manufactured rubber gloves, thereby securing an advantage of not being easily torn.
- additives used in the dip molding process may be further added to the latex composition for dip molding.
- additives may be one selected from the group consisting of vulcanizing agents, vulcanizing catalysts, fillers, crosslinking agents (eg ionic crosslinking agents), pigments, thickeners and pH adjusting agents.
- the additives are used in an amount of 10 parts by weight or less based on 100 parts by weight of a latex composition for forming a dip (carboxylic acid-modified nitrile copolymer latex and poly ( N -isopropylacrylamide)), and the specific content thereof is conventional in the art. It can be adjusted appropriately within the range known by the person skilled in the art.
- the carboxylic acid-modified nitrile copolymer latex in the total dip molding latex composition includes 80 to 99% by weight, preferably 85 to 98% by weight, more preferably 88 to 97% by weight. It is preferable in terms of the glove properties, which is a kind of dip molded product of the present invention.
- the solid content concentration of the latex composition for dip molding of the present invention is 10 to 40% by weight, preferably 15 to 35% by weight, more preferably 15 to 30% by weight.
- the pH of the latex composition for dip molding of the present invention is 8.0 to 12, preferably 9 to 11, more preferably 9.3 to 10.5.
- a dip molded article for achieving another object of the present invention is characterized by being obtained by dip molding the composition.
- a conventional method can be used, and examples thereof include a direct dipping method, an anode adhesion dipping method, and a Teague adhesion dipping method.
- the positive electrode adhesion dipping method is preferable because a dip molded article having a uniform thickness can be easily obtained.
- a dip mold having a hand shape is used as a mold, and the mold is coated on a coagulant solution and dried to apply a coagulant to the mold surface.
- Coagulants such as barium chloride, calcium chloride, magnesium chloride, zinc chloride and aluminum chloride and the like Metal halides; Nitrates such as barium nitrate, calcium nitrate and zinc nitrate; Acetates such as barium acetate, calcium acetate and zinc acetate; Sulfates such as calcium sulfate, magnesium sulfate and aluminum sulfate. Of these, calcium chloride and calcium nitrate are preferred.
- the coagulant solution is a solution in which such coagulant is dissolved in water, alcohol or a mixture thereof. The concentration of coagulant in the coagulant solution is usually 5 to 50% by weight, preferably 10 to 40% by weight.
- step (b) a mold having a coagulant attached is immersed in the latex composition for dip molding of the present invention to form a dip molding layer.
- the mold to which the coagulant is stuck is immersed in the latex composition for dip molding made of the latex resin composition of the present invention, and then the mold is taken out to form a dip molding layer on the mold.
- step (c) a step of crosslinking the latex resin is performed by heating the dip molding layer formed on the mold.
- the water component evaporates first and curing through crosslinking is performed.
- the dip molding layer obtained in the step (c) is peeled off from the mold to obtain a dip molded product, and the physical properties of the obtained dip molded product are measured.
- Dumbbell-shaped specimens were produced from the obtained dip molded articles in accordance with ASTM D-412. Subsequently, the specimen is pulled at an elongation rate of 500 mm / min using a UTM (Universal Testing Machine), the tensile strength and elongation at break are measured, and the touch (modulus) at 300% and 500% elongation is felt. Measure
- the process according to the invention can be used for any latex article which can be produced by known dip molding methods. Specifically, it can be applied to dip molded latex articles selected from health care products such as surgical gloves, examination gloves, condoms, catheters or various kinds of industrial and household gloves.
- Agitator, thermometer, cooler, nitrogen inlet, 10L high pressure reactor equipped with a monomer, emulsifier, and polymerization initiator can be continuously added with nitrogen, and then acrylonitrile 25% by weight, 1,4-butadiene 70 2.5 parts by weight of sodium alkyl benzene sulfonate, 0.5 parts by weight of t-dodecyl mercaptan and 140 parts by weight of ion-exchanged water were added to 100 parts by weight of the monomer mixture of 5% by weight and methacrylic acid, and the temperature was raised to 40 ° C.
- the average particle diameter and glass transition temperature of the prepared latex were measured.
- the average particle diameter was measured by a laser scattering analyzer (Nicomp), and the glass transition temperature was measured by differential scanning calorimetry (Differential Scanning Calorimetry).
- the glass transition temperature of the prepared latex was -40 °C
- the average particle diameter was measured to 130nm, hereinafter referred to as the latex prepared 'latex-A'.
- a coagulant solution was prepared by mixing 12 parts by weight of calcium nitrate, 87.5 parts by weight of distilled water, and 0.5 parts by weight of wetting agent (Teric 320 produced by Huntsman Corporation, Australia).
- the hand-shaped ceramic mold was immersed in this solution for 1 minute, pulled out, and dried at 80 ° C. for 3 minutes to apply a coagulant to the hand-shaped mold.
- the mold to which the coagulant was applied was immersed in the above-mentioned dip molding latex composition for 1 minute, pulled up, dried at 80 ° C for 1 minute, and then immersed in water or hot water for 3 minutes.
- the mold was dried at 80 ° C. for 3 minutes and crosslinked at 120 ° C. for 20 minutes.
- the crosslinked dip molding layer was peeled off from the hand-shaped mold to obtain a dip molded article in the form of a glove.
- Example 2 Except that 2 parts by weight of poly ( N -isopropylacrylamide) was used, the same procedure as in Example 1 was carried out to prepare a dip molded article in the form of a glove.
- a dip molded article in the form of a glove was manufactured in the same manner as in Example 1, except that 0.5 parts by weight of poly ( N -isopropylacrylamide) having a number average molecular weight of 60,000 g / mol was used.
- a dip molded article in the form of a glove was manufactured in the same manner as in Example 1, except that 1 part by weight of poly ( N -isopropylacrylamide) having a number average molecular weight of 60,000 g / mol was used.
- a dip molded article in the form of a glove was prepared in the same manner as in Example 1, except that 2 parts by weight of a poly ( N -isopropylacrylamide-co-methacrylic acid) copolymer having a number average molecular weight of 60,000 g / mol was used. Prepared.
- a dip molded article in the form of a glove was prepared in the same manner as in Example 1, except that 5 parts by weight of a poly ( N -isopropylacrylamide-co-methacrylic acid) copolymer having a number average molecular weight of 60,000 g / mol was used. Prepared.
- a dip molded article in the form of a glove was manufactured in the same manner as in Example 1, except that Latex A was used alone in Example 1.
- the coagulant-coated mold was immersed in the dip molding latex composition for 1 minute, pulled up, dried at 120 ° C. for 4 minutes, and then immersed in water or hot water for 3 minutes. It was confirmed by the synergy time by checking the time of dropping water drops at 120 °C drying for 4 minutes.
- Example 1 148 31.3 5.6 16.2
- Example 2 166 34.1 5.2 13.3
- Example 3 220 31.0 5.5 14.6
- Example 4 > 240 34.0 5.7 15.5
- Example 5 137 32.8 5.6 15.2
- Example 6 > 240 34.5 5.5 13.2
- Example 7 > 240 34.2 5.1 12.7
- Example 8 154 31.6 5.9 14.4 Comparative Example 1 136 30.9 5.3 13.0
- the dips of Examples 1 to 8 using poly ( N -isopropylacrylamide) or a copolymer thereof, which is a water-soluble polymer capable of crosslinking with a carboxylic acid-modified nitrile latex according to the present invention Compared to the dip molded product manufactured in Comparative Example 1, the molded product was found to have a gentle synergy and excellent tensile strength.
- the latex composition for dip molding according to the present invention can be used for the production of latex articles such as health care products such as various industrial and household gloves.
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- Chemical & Material Sciences (AREA)
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- Medicinal Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Dispersion Chemistry (AREA)
- Moulding By Coating Moulds (AREA)
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- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
Description
| 시너리시스(sec) | 인장강도(MPa) | 신율 300%에서 응력(Mpa) | 신율 500%에서 응력(Mpa) | |
| 실시예 1 | 148 | 31.3 | 5.6 | 16.2 |
| 실시예 2 | 166 | 34.1 | 5.2 | 13.3 |
| 실시예 3 | 220 | 31.0 | 5.5 | 14.6 |
| 실시예 4 | >240 | 34.0 | 5.7 | 15.5 |
| 실시예 5 | 137 | 32.8 | 5.6 | 15.2 |
| 실시예 6 | >240 | 34.5 | 5.5 | 13.2 |
| 실시예 7 | >240 | 34.2 | 5.1 | 12.7 |
| 실시예 8 | 154 | 31.6 | 5.9 | 14.4 |
| 비교예 1 | 136 | 30.9 | 5.3 | 13.0 |
Claims (14)
- 카르본산 변성 니트릴계 공중합체 라텍스; 및폴리(N-이소프로필아크릴아마이드) 또는 이의 공중합체;를 포함하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 카르본산 변성 니트릴계 공중합체 라텍스는 유리전이온도가 -50 내지 -15℃이고, 평균 입경이 90 내지 200nm인 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 폴리(N-이소프로필아크릴아마이드) 또는 이의 공중합체는 수평균 분자량이 5,000 내지 80,000 g/mol인 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 폴리(N-이소프로필아크릴아마이드) 또는 이의 공중합체는 0.5 내지 15 중량% 농도를 갖는 수용액으로 사용하는 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 폴리(N-이소프로필아크릴아마이드) 공중합체는 N-이소프로필아크릴아마이드 단량체와 아크릴산, 메타크릴산, 이타콘산, 말레인산, 푸마르산 및 이들의 조합으로 이루어진 군에서 선택된 1종의 에틸렌성 불포화 카르본산 단량체와 공중합된 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제5항에 있어서,상기 폴리(N-이소프로필아크릴아마이드) 공중합체는 N-이소프로필아크릴아마이드 단량체 80 이상 100 몰% 미만과 에틸렌성 불포화 카르본산 단량체 0 초과 20 몰% 이하의 몰비로 공중합된 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 딥 성형용 라텍스 조성물은 카르본산 변성 니트릴계 공중합체 라텍스 100 중량부에 대해 폴리(N-이소프로필아크릴아마이드) 또는 이의 공중합체 0.1 내지 10 중량부를 포함하는 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 카르본산 변성 니트릴계 공중합체는 공액디엔계 단량체 40 내지 89 중량%, 에틸렌성 불포화 니트릴계 단량체 10 내지 50 중량% 및 에틸렌성 불포화산 단량체 0.1 내지 10 중량%를 포함하는 단량체 혼합물이 중합됨을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제8항에 있어서,상기 공액디엔계 단량체는 1,3-부타디엔, 2,3-디메틸-1,3-부타디엔, 2-에틸-1,3-부타디엔, 1,3-펜타디엔, 이소프렌 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제8항에 있어서,상기 에틸렌성 불포화 니트릴계 단량체는 아크릴로니트릴, 메타크릴로니트릴, 후마로니트릴, α-클로로니트릴, α-시아노 에틸 아크릴로니트릴 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제8항에 있어서,상기 에틸렌성 불포화산 단량체는 아크릴산, 메타크릴산, 이타콘산, 말레인산, 푸마르산, 무수말레산, 무수 시트라콘산, 스티렌 술폰산, 푸마르산 모노부틸, 말레인산 모노부틸, 말레인산 모노-2-하이드록시 프로필 및 이들의 조합으로 이루어진 군에서 선택된 1종을 포함하는 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항에 있어서,상기 조성물은 가황제, 가황촉매, 충전재, 가교제, 안료, 증점제, pH 조절제 및 이들의 조합으로 이루어진 군에서 선택된 1종의 첨가제를 더욱 포함하는 것을 특징으로 하는 딥 성형용 라텍스 조성물.
- 제1항 내지 제12항 중 어느 한 항에 따른 딥 성형용 라텍스 조성물로 딥 성형하여 제조된 것을 특징으로 하는 딥 성형품.
- a) 응고제 용액을 몰드에 도포 후 건조하는 단계; b) 응고제가 도포된 몰드에 딥 성형용 라텍스 조성물을 도포하여 딥 성형층을 형성하는 단계; c) 상기 딥 성형층을 가교하는 단계; 및 d) 가교된 딥 성형층을 몰드로부터 벗겨내어 딥 성형품을 수득하는 단계;를 포함하되,상기 딥 성형용 라텍스 조성물은 제1항 내지 제12항 중 어느 한 항에 따른 딥 성형용 라텍스 조성물인 것을 특징으로 하는 딥 성형품의 제조방법.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017523846A JP6461337B2 (ja) | 2015-10-21 | 2016-10-05 | ディップ成形用ラテックス状組成物及びそれから製造された成形品 |
| MYPI2018700346A MY183601A (en) | 2015-10-21 | 2016-10-05 | Latex composition for dip molding and molded article manufacturing therefrom |
| CN201680050306.5A CN107922677B (zh) | 2015-10-21 | 2016-10-05 | 用于浸渍模塑的胶乳组合物和由其制备的模制品 |
| US15/751,326 US10669406B2 (en) | 2015-10-21 | 2016-10-05 | Latex composition for dip molding and molded article manufactured therefrom |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020150146424A KR101964276B1 (ko) | 2015-10-21 | 2015-10-21 | 딥 성형용 라텍스 조성물 및 이로부터 제조된 성형품 |
| KR10-2015-0146424 | 2015-10-21 |
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| WO2017069433A1 true WO2017069433A1 (ko) | 2017-04-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| PCT/KR2016/011126 Ceased WO2017069433A1 (ko) | 2015-10-21 | 2016-10-05 | 딥 성형용 라텍스 조성물 및 이로부터 제조된 성형품 |
Country Status (6)
| Country | Link |
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| US (1) | US10669406B2 (ko) |
| JP (1) | JP6461337B2 (ko) |
| KR (1) | KR101964276B1 (ko) |
| CN (1) | CN107922677B (ko) |
| MY (1) | MY183601A (ko) |
| WO (1) | WO2017069433A1 (ko) |
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| US12156552B2 (en) | 2013-07-22 | 2024-12-03 | Summit Glove Inc. | Protective device for use with a glove |
| US11925222B2 (en) | 2015-06-19 | 2024-03-12 | Summit Glove Inc. | Safety glove with fingertip protective member |
| RU2647861C2 (ru) | 2013-12-23 | 2018-03-21 | Сайтек Индастриз Инк. | Полиакрилонитрильные (пан) полимеры c низким индексом полидисперсности (ипд) и получаемые из них углеродные волокна |
| KR102823855B1 (ko) * | 2019-05-28 | 2025-06-24 | 주식회사 엘지화학 | 딥 성형용 라텍스 조성물, 이를 포함하는 딥 성형품 및 이를 이용한 딥 성형품 제조방법 |
| KR102492405B1 (ko) | 2019-10-07 | 2023-01-27 | 주식회사 엘지화학 | 카르본산 변성 니트릴계 공중합체 라텍스의 제조방법 |
| CN113185624B (zh) * | 2021-05-13 | 2022-09-09 | 山东星宇手套有限公司 | 一种环保水性胶乳凝固剂及橡胶涂层制品的制备方法 |
| CN116635154A (zh) * | 2021-07-12 | 2023-08-22 | 株式会社Lg化学 | 用于超吸收性聚合物的辊磨机和使用其制备超吸收性聚合物的方法 |
| US12178268B2 (en) * | 2022-07-27 | 2024-12-31 | Summit Glove Inc. | Protective device for use with a glove |
| GB202406554D0 (en) | 2024-05-10 | 2024-06-26 | Bmg British Medical Group Ltd | Stable latex formulations |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR101964276B1 (ko) | 2019-04-01 |
| US10669406B2 (en) | 2020-06-02 |
| US20180230297A1 (en) | 2018-08-16 |
| CN107922677B (zh) | 2020-09-04 |
| CN107922677A (zh) | 2018-04-17 |
| MY183601A (en) | 2021-03-02 |
| KR20170046295A (ko) | 2017-05-02 |
| JP2018513222A (ja) | 2018-05-24 |
| JP6461337B2 (ja) | 2019-01-30 |
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