WO2022202254A1 - クロロプレン重合体ラテックス組成物、及び、浸漬成形体 - Google Patents
クロロプレン重合体ラテックス組成物、及び、浸漬成形体 Download PDFInfo
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- WO2022202254A1 WO2022202254A1 PCT/JP2022/009789 JP2022009789W WO2022202254A1 WO 2022202254 A1 WO2022202254 A1 WO 2022202254A1 JP 2022009789 W JP2022009789 W JP 2022009789W WO 2022202254 A1 WO2022202254 A1 WO 2022202254A1
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- chloroprene polymer
- polymer latex
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- VTEKOFXDMRILGB-UHFFFAOYSA-N bis(2-ethylhexyl)carbamothioylsulfanyl n,n-bis(2-ethylhexyl)carbamodithioate Chemical compound CCCCC(CC)CN(CC(CC)CCCC)C(=S)SSC(=S)N(CC(CC)CCCC)CC(CC)CCCC VTEKOFXDMRILGB-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 125000000484 butyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])C([H])([H])[H] 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000011088 calibration curve Methods 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000004581 coalescence Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- ZOUQIAGHKFLHIA-UHFFFAOYSA-L copper;n,n-dimethylcarbamodithioate Chemical compound [Cu+2].CN(C)C([S-])=S.CN(C)C([S-])=S ZOUQIAGHKFLHIA-UHFFFAOYSA-L 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 150000003946 cyclohexylamines Chemical class 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 description 1
- PGAXJQVAHDTGBB-UHFFFAOYSA-N dibutylcarbamothioylsulfanyl n,n-dibutylcarbamodithioate Chemical compound CCCCN(CCCC)C(=S)SSC(=S)N(CCCC)CCCC PGAXJQVAHDTGBB-UHFFFAOYSA-N 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 229940116901 diethyldithiocarbamate Drugs 0.000 description 1
- LMBWSYZSUOEYSN-UHFFFAOYSA-N diethyldithiocarbamic acid Chemical compound CCN(CC)C(S)=S LMBWSYZSUOEYSN-UHFFFAOYSA-N 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000004821 distillation Methods 0.000 description 1
- 150000002019 disulfides Chemical class 0.000 description 1
- 229960002377 dixanthogen Drugs 0.000 description 1
- GVGUFUZHNYFZLC-UHFFFAOYSA-N dodecyl benzenesulfonate;sodium Chemical compound [Na].CCCCCCCCCCCCOS(=O)(=O)C1=CC=CC=C1 GVGUFUZHNYFZLC-UHFFFAOYSA-N 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- WHDGWKAJBYRJJL-UHFFFAOYSA-K ferbam Chemical compound [Fe+3].CN(C)C([S-])=S.CN(C)C([S-])=S.CN(C)C([S-])=S WHDGWKAJBYRJJL-UHFFFAOYSA-K 0.000 description 1
- 238000004817 gas chromatography Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 125000002768 hydroxyalkyl group Chemical group 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 229920003052 natural elastomer Polymers 0.000 description 1
- 238000000655 nuclear magnetic resonance spectrum Methods 0.000 description 1
- ZWWQICJTBOCQLA-UHFFFAOYSA-N o-propan-2-yl (propan-2-yloxycarbothioyldisulfanyl)methanethioate Chemical compound CC(C)OC(=S)SSC(=S)OC(C)C ZWWQICJTBOCQLA-UHFFFAOYSA-N 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- HSJXWMZKBLUOLQ-UHFFFAOYSA-M potassium;2-dodecylbenzenesulfonate Chemical compound [K+].CCCCCCCCCCCCC1=CC=CC=C1S([O-])(=O)=O HSJXWMZKBLUOLQ-UHFFFAOYSA-M 0.000 description 1
- GEVPMUPAXHXQQS-UHFFFAOYSA-N potassium;nitrate;tetrahydrate Chemical compound O.O.O.O.[K+].[O-][N+]([O-])=O GEVPMUPAXHXQQS-UHFFFAOYSA-N 0.000 description 1
- 238000000045 pyrolysis gas chromatography Methods 0.000 description 1
- 238000010526 radical polymerization reaction Methods 0.000 description 1
- 208000017520 skin disease Diseases 0.000 description 1
- 229940080264 sodium dodecylbenzenesulfonate Drugs 0.000 description 1
- HUMLQUKVJARKRN-UHFFFAOYSA-M sodium;n,n-dibutylcarbamodithioate Chemical compound [Na+].CCCCN(C([S-])=S)CCCC HUMLQUKVJARKRN-UHFFFAOYSA-M 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000010059 sulfur vulcanization Methods 0.000 description 1
- 229910052714 tellurium Inorganic materials 0.000 description 1
- PORWMNRCUJJQNO-UHFFFAOYSA-N tellurium atom Chemical compound [Te] PORWMNRCUJJQNO-UHFFFAOYSA-N 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 239000004034 viscosity adjusting agent Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- RKQOSDAEEGPRER-UHFFFAOYSA-L zinc diethyldithiocarbamate Chemical compound [Zn+2].CCN(CC)C([S-])=S.CCN(CC)C([S-])=S RKQOSDAEEGPRER-UHFFFAOYSA-L 0.000 description 1
- PGNWIWKMXVDXHP-UHFFFAOYSA-L zinc;1,3-benzothiazole-2-thiolate Chemical compound [Zn+2].C1=CC=C2SC([S-])=NC2=C1.C1=CC=C2SC([S-])=NC2=C1 PGNWIWKMXVDXHP-UHFFFAOYSA-L 0.000 description 1
- NEYNBSGIXOOZGZ-UHFFFAOYSA-L zinc;butoxymethanedithioate Chemical compound [Zn+2].CCCCOC([S-])=S.CCCCOC([S-])=S NEYNBSGIXOOZGZ-UHFFFAOYSA-L 0.000 description 1
- KMNUDJAXRXUZQS-UHFFFAOYSA-L zinc;n-ethyl-n-phenylcarbamodithioate Chemical compound [Zn+2].CCN(C([S-])=S)C1=CC=CC=C1.CCN(C([S-])=S)C1=CC=CC=C1 KMNUDJAXRXUZQS-UHFFFAOYSA-L 0.000 description 1
- SZNCKQHFYDCMLZ-UHFFFAOYSA-L zinc;propan-2-yloxymethanedithioate Chemical compound [Zn+2].CC(C)OC([S-])=S.CC(C)OC([S-])=S SZNCKQHFYDCMLZ-UHFFFAOYSA-L 0.000 description 1
- DUBNHZYBDBBJHD-UHFFFAOYSA-L ziram Chemical compound [Zn+2].CN(C)C([S-])=S.CN(C)C([S-])=S DUBNHZYBDBBJHD-UHFFFAOYSA-L 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L11/00—Compositions of homopolymers or copolymers of chloroprene
- C08L11/02—Latex
-
- 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
- B29K2011/00—Use of rubber derived from chloroprene as moulding material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0058—Liquid or visquous
- B29K2105/0064—Latex, emulsion or dispersion
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4842—Outerwear
- B29L2031/4864—Gloves
-
- 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
- C08J2311/00—Characterised by the use of homopolymers or copolymers of chloroprene
- C08J2311/02—Latex
Definitions
- the present invention relates to a chloroprene polymer latex composition and a dip molded article. More specifically, the present invention provides a chloroprene polymer latex composition containing a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene, and a dip-molded article using the chloroprene polymer latex composition. Regarding.
- Chloroprene polymers are known as materials for dip-molded products such as medical surgical gloves, medical examination gloves, industrial gloves, balloons, catheters, and rubber boots.
- Patent Document 1 describes that damping performance is improved by mixing a low-molecular-weight chloroprene polymer having a number average molecular weight in the range of 500 to 50,000 for anti-vibration rubber applications.
- Patent Document 2 100 parts by mass of modified polychloroprene obtained by copolymerizing chloroprene and methacrylic acid, 90 to 150 parts by mass of water, 1 to 5 parts by mass of an emulsifier, potassium A polychloroprene latex of pH 7-14 containing 0.5-2.5 parts by weight of ions is described.
- Patent Document 3 chloroprene and 2,3-dichloro-1,3-butadiene are copolymerized for use in dip-molded products, and the 13C-solid NMR spectrum of polychloroprene shows 126.2 to 127.6 ppm.
- the peak area (A) of , the peak area (B) of 122.0 to 126.2 ppm, and the peak area (C) of 129.9 to 130.3 ppm are in the range represented by the following general formula (I).
- a chloroprene latex is described.
- Patent Document 4 below describes a chloroprene polymer latex that can achieve both excellent flexibility and mechanical properties in vulcanized rubber produced by dip molding by containing high and low molecular weight materials for use in dip molded products. is described.
- chloroprene polymer dip-molded films generally have excellent mechanical strength by adding cross-linking agents such as sulfur and vulcanization accelerators. It has been used as a raw material for rubber latex in dip molded coatings for catheters and the like. On the other hand, as with dip-molded coatings obtained using natural rubber or polyisoprene, there is a tendency to require high flexibility, and especially in glove applications, physical properties related to flexibility, which are directly linked to the feeling of wearing and the texture of the coating, are improved. It would be desirable to have a chloroprene polymer latex with a
- sulfur and vulcanization accelerators which are preferred for improving mechanical strength, are substances that correspond to type IV allergy ingredients that adversely affect the human body.
- a chloroprene polymer latex that can provide superior dip-molded coatings is desired.
- the present invention provides a chloroprene polymer latex composition that enables obtaining a chloroprene polymer dip-molded coating having high breaking strength and excellent flexibility without using sulfur and a vulcanization accelerator.
- the main purpose is to
- the present invention provides a chloroprene polymer latex composition which is a mixture of a chloroprene polymer latex A and a chloroprene polymer latex B, wherein the chloroprene polymer latex A and the chloroprene polymer latex B contain a chloroprene polymer.
- the chloroprene polymer of the chloroprene polymer latex B contains a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene, and 2, in the chloroprene polymer of the chloroprene polymer latex B, 3-dichloro-1,3-butadiene copolymerization amount (content of monomer units of 2,3-dichloro-1,3-butadiene; - 3% by mass or more with respect to the total 100% by mass of butadiene, the toluene-insoluble content of the chloroprene polymer in the chloroprene polymer latex B is 70% by mass or more, and the toluene soluble in the chloroprene polymer latex A
- the weight average molecular weight of each component is 5,000 to 250,000, and an ethanol/toluene azeotrope (ethanol/toluene specified in JIS K 6229) is obtained from the dried product
- the present invention relates to a chloroprene polymer latex composition in which the mass ratio b/a of the total amount b of acid, levopimaric acid and salts thereof is 0.10 or more.
- JIS means Japanese Industrial Standards.
- the chloroprene polymer latex composition may be a chloroprene polymer latex composition in which the toluene-insoluble content of the chloroprene polymer in the chloroprene polymer latex A is 5% by mass or less.
- the chloroprene polymer latex composition may be a chloroprene polymer latex composition in which the toluene-insoluble content of the chloroprene polymer in the chloroprene polymer latex B is 70 to 95% by mass.
- the proportion of the chloroprene polymer latex A is 0.50 to 30.0 parts by mass with respect to a total of 100 parts by mass of the chloroprene polymer latex A and the chloroprene polymer latex B. and wherein the chloroprene polymer contained in the chloroprene polymer latex composition has a toluene-insoluble content of 50 to 85% by mass.
- the present invention also relates to a dip-molded article using the chloroprene polymer latex composition.
- Such dip compacts may be free of sulfur and vulcanization accelerators.
- the dip molded body may be a glove, balloon, catheter or boot.
- a chloroprene polymer dip-molded coating having high breaking strength and excellent flexibility can be obtained without using sulfur and a vulcanization accelerator, which correspond to type IV allergy components that adversely affect the human body. It is possible to provide a chloroprene polymer latex composition capable of Such a chloroprene polymer latex composition has a weight average molecular weight of 250,000 or less, which is a relatively low molecular weight of the toluene-soluble component, and thus has excellent flexibility due to the plasticizing effect of the low-molecular-weight polymer. be able to. According to the present invention, it is also possible to obtain a chloroprene polymer dip-molded coating having high breaking strength and breaking elongation and excellent flexibility without using sulfur and a vulcanization accelerator.
- the numerical range "above A” means A and the range exceeding A.
- “A or less” in a numerical range means A and a range less than A.
- the upper limit value or lower limit value of the numerical range in one step can be arbitrarily combined with the upper limit value or lower limit of the numerical range in another step.
- the upper or lower limits of the numerical ranges may be replaced with the values shown in the examples.
- “A or B” may include either one of A and B, or may include both. The materials exemplified in this specification can be used singly or in combination of two or more unless otherwise specified.
- each component in the composition means the total amount of the plurality of substances present in the composition unless otherwise specified when there are multiple substances corresponding to each component in the composition.
- “(Meth)acrylic acid” means at least one of acrylic acid and methacrylic acid corresponding thereto, and the same applies to other similar expressions such as “(meth)acrylate”.
- Toluene at a room temperature of 23° C. can be used for the measurement of the “toluene soluble matter” and the “toluene insoluble matter”.
- the chloroprene polymer latex composition according to the present embodiment (hereinafter referred to as “mixed chloroprene polymer latex composition”) is a mixture of chloroprene polymer latex A and chloroprene polymer latex B.
- the mixed chloroprene polymer latex composition according to the present embodiment is obtained, for example, by stirring and mixing two or more chloroprene polymer latexes including the chloroprene polymer latexes A and B at 100 rpm for 1 minute using a paddle blade. be able to.
- the mixed chloroprene polymer latex composition according to the present embodiment may be obtained by mixing a chloroprene polymer latex other than the chloroprene polymer latexes A and B.
- chloroprene polymer latexes other than chloroprene polymer latexes A and B examples include 2,3-dichloro- A chloroprene polymer latex having high crystallinity without copolymerization of 1,3-butadiene may be mentioned.
- Chloroprene polymer latex A contains a chloroprene polymer.
- a chloroprene polymer is a polymer having chloroprene (2-chloro-1,3-butadiene) as a monomer unit, and is a homopolymer of chloroprene or a copolymer of chloroprene and another monomer ( a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene).
- the chloroprene polymer latex B contains a chloroprene polymer, and the chloroprene polymer contains a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene.
- a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene is a polymer having chloroprene and 2,3-dichloro-1,3-butadiene as monomer units.
- -Dichloro-1,3-butadiene can be obtained by polymerizing a monomer composition.
- Copolymers of chloroprene and 2,3-dichloro-1,3-butadiene may have monomer units of monomers other than chloroprene and 2,3-dichloro-1,3-butadiene .
- monomers include esters of (meth)acrylic acid (methyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, etc.), hydroxyalkyl (meth)acrylates ( 2-hydroxymethyl (meth)acrylate, 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, etc.), (meth)acrylic acid, 1-chloro-1,3-butadiene, butadiene, isoprene, ethylene , styrene, (meth)acrylonitrile, and the like.
- a copolymer of chloroprene and 2,3-dichloro-1,3-butadiene has monomer units of monomers other than chloroprene and 2,3-dichloro-1,3-butadiene. It may be a copolymer consisting essentially of chloroprene monomer units and 2,3-dichloro-1,3-butadiene monomer units.
- At least one selected from the group consisting of chloroprene polymer latex A and chloroprene polymer latex B consists of at least one selected from the group consisting of rosin acid, sodium rosinate and potassium rosinate, sodium hydroxide and potassium hydroxide. and at least one selected from the group.
- the emulsified system of the chloroprene polymer latexes A and B is desirably combined with the base latex in order to prevent aggregation of rubber solids, pH fluctuations, etc. when blended.
- the toluene-insoluble portion of the chloroprene polymer is obtained by dissolving the chloroprene polymer obtained by freeze-drying the chloroprene polymer latexes A, B or the mixed chloroprene polymer latex composition in toluene, followed by centrifugation. It is obtained by measuring the mass of the dried product obtained by drying after separating the insoluble matter (gel content) using a mesh wire mesh.
- the toluene-insoluble content (gel content) of the chloroprene polymer in the chloroprene polymer latex A is preferably 10% by mass or less with respect to 100% by mass of the chloroprene polymer. If the toluene-insoluble content is 10% by mass or less, the modulus value at 100% elongation, which is an index of the flexibility of the dip-molded coating obtained using the mixed chloroprene polymer latex composition, tends to be low, resulting in excellent flexibility. easy to obtain.
- the toluene-insoluble portion of the chloroprene polymer of the chloroprene polymer latex A is 8% by mass or less, 6% by mass or less, 5% by mass or less, less than 5% by mass, and 4% by mass or less from the viewpoint of easily obtaining excellent flexibility. , 3% by mass or less, 2% by mass or less, or 1.5% by mass or less.
- the toluene insoluble content is 0% by mass or more, 0% by mass or more, 1% by mass or more, 1.5% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, or 6 % by mass or more.
- the toluene insoluble content is more than 0% by mass and 10% by mass or less, 1 to 10% by mass, 1.5 to 10% by mass, more than 0% by mass to 6% by mass, 1 to 6% by mass, 1. It may be 5 to 6% by mass, more than 0% to 3% by mass, 1 to 3% by mass, or 1.5 to 3% by mass.
- the toluene-insoluble content (gel content) of the chloroprene polymer in the chloroprene polymer latex B is 70% by mass or more with respect to 100% by mass of the chloroprene polymer.
- the dip-molded coating obtained using the mixed chloroprene polymer latex composition has excellent flexibility, and a crosslinked structure is formed by entanglement (gel) between polymers. This increases the mechanical strength of the dip-molded coating.
- the toluene insoluble content of the chloroprene polymer in the chloroprene polymer latex B is 75% by mass or more, 80% by mass or more, and 82% by mass from the viewpoint of easily obtaining excellent flexibility and from the viewpoint of easily increasing mechanical strength. Above, it may be 85% by mass or more, 86% by mass or more, or 90% by mass or more.
- the toluene-insoluble content is 95% by mass or less, 90% by mass or less, 86% by mass or less, 85% by mass or less, 82% by mass or less, and 80% by mass from the viewpoint of easily avoiding a decrease in polymerization reactivity due to a decrease in unreacted monomers. % or less, or 75% by mass or less. From these viewpoints, the toluene insoluble content is 70 to 95% by mass, 70 to 90% by mass, 70 to 85% by mass, 75 to 95% by mass, 75 to 90% by mass, or 75 to 85% by mass. good.
- the toluene-insoluble content (gel content) of the chloroprene polymer contained in the mixed chloroprene polymer latex composition may be within the following range with respect to 100% by mass of the chloroprene polymer.
- the toluene-insoluble content may be 50% by mass or more, 55% by mass or more, 60% by mass or more, 65% by mass or more, 70% by mass or more, 75% by mass or more, or 80% by mass or more.
- the toluene-insoluble content may be 85% by mass or less, 80% by mass or less, 75% by mass or less, 70% by mass or less, 65% by mass or less, 60% by mass or less, or 55% by mass or less.
- the toluene-insoluble matter is 50 to 85% by mass, 50 to 80% by mass, 50 to 75% by mass, 60 to 85% by mass, 60 to 80% by mass, or 60 to 75% by mass. good.
- the numerical range of the toluene-insoluble matter can be adjusted by the mixing ratio of the chloroprene polymer latex A and the chloroprene polymer latex B.
- the weight average molecular weight of the toluene-soluble portion (toluene-soluble sol portion) in the chloroprene polymer latex A is 5,000 to 250,000.
- the weight-average molecular weight is 250,000 or less, the plasticizing effect of the low-molecular-weight polymer provides a dip-molded coating exhibiting excellent flexibility.
- the weight average molecular weight is 5,000 or more, a dip-molded coating can be suitably obtained.
- the weight-average molecular weight of the toluene-soluble component may be within the following range from the viewpoint of easily achieving both excellent flexibility and breaking strength.
- Weight average molecular weight is 6,000 or more, 7,000 or more, 10,000 or more, 12,000 or more, 15,000 or more, 16,000 or more, 18,000 or more, 20,000 or more, 22,000 or more, Alternatively, it may be 24,000 or more.
- the weight average molecular weight is 240,000 or less, 220,000 or less, 200,000 or less, 180,000 or less, 100,000 or less, 50,000 or less, 25,000 or less, 24,000 or less, 22,000 or less, It may be 20,000 or less, 18,000 or less, 16,000 or less, 15,000 or less, 12,000 or less, 10,000 or less, or 7,000 or less.
- the weight average molecular weight is 5,000 to 240,000, 5,000 to 180,000, 6,000 to 240,000, 6,000 to 200,000, 6,000 to 100,000, 6,000-50,000, 6,000-25,000, 7,000-100,000, 7,000-50,000, 7,000-25,000, 10,000-100,000, 10, 000 to 50,000, 10,000 to 25,000, 20,000 to 100,000, 20,000 to 50,000, or 20,000 to 25,000.
- the weight average molecular weight of the toluene soluble content can be obtained by dissolving the chloroprene polymer latex A in toluene and measuring the weight average molecular weight of the eluted content (sol content) by gel permeation chromatography (GPC). The measured value of the weight-average molecular weight varies depending on the blending amount (amount of charge) of the chain transfer agent and the like.
- chloroprene copolymerization amount When the chloroprene polymer contained in the chloroprene polymer latex A is a copolymer of chloroprene and other monomers, the chloroprene copolymerization amount in the chloroprene polymer (content of chloroprene monomer units; ) is 100% by mass of the total amount of monomer units in the chloroprene polymer, or the amount of chloroprene copolymerized and 2,3-dichloro -1,3-butadiene may be in the following range with respect to the total 100 mass% of the copolymerization amount.
- Chloroprene copolymerization amount is 99% by mass or less, 97% by mass or less, 95% by mass or less, 92% by mass or less, 90% by mass or less, 88% by mass or less, 85% by mass or less, 82% by mass or less, or 80% by mass % or less. Chloroprene copolymerization amount is 50% by mass or more, 50% by mass or more, 60% by mass or more, 70% by mass or more, 75% by mass or more, 80% by mass or more, 82% by mass or more, 85% by mass or more, 88% by mass or more , or 90% by mass or more.
- the chloroprene copolymerization amount is 50 to 99% by mass, 70 to 99% by mass, 80 to 99% by mass, 85 to 99% by mass, 90 to 99% by mass, 50 to 90% by mass, 70 to 90% by mass. % by weight, 80-90% by weight, 85-90% by weight, 50-85% by weight, 70-85% by weight, 80-85% by weight, 50-80% by weight, or 70-80% by weight .
- the amount of chloroprene copolymerized in the chloroprene polymer of the chloroprene polymer latex B is 100% by mass of the total amount of monomer units in the chloroprene polymer, or 100% by mass of the chloroprene weight, from the viewpoint of easily obtaining excellent flexibility in the dip-molded coating.
- the following ranges may be used with respect to the total 100% by mass of the chloroprene copolymerization amount and the 2,3-dichloro-1,3-butadiene copolymerization amount during coalescence.
- Chloroprene copolymerization amount is 99% by mass or less, 97% by mass or less, 95% by mass or less, 92% by mass or less, 90% by mass or less, 88% by mass or less, 85% by mass or less, 82% by mass or less, or 80% by mass % or less. Chloroprene copolymerization amount is 70% by mass or more, 75% by mass or more, 80% by mass or more, 82% by mass or more, 85% by mass or more, 88% by mass or more, 90% by mass or more, 92% by mass or more, or 95% by mass % or more.
- the chloroprene copolymerization amount is 70 to 99% by mass, 70 to 97% by mass, 70 to 95% by mass, 70 to 90% by mass, 80 to 99% by mass, 80 to 97% by mass, 80 to 95% by mass. % by weight, 80-90% by weight, 85-99% by weight, 85-97% by weight, 85-95% by weight, or 85-90% by weight.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized in the chloroprene polymer is determined by dip molding.
- the total amount of the monomer units in the chloroprene polymer is 100% by mass, or the amount of chloroprene copolymerized in the chloroprene polymer and 2,3-dichloro-1,3- It may be in the following range with respect to the total 100% by mass of the butadiene copolymerization amount.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized is 1% by mass or more, 3% by mass or more, 5% by mass or more, 8% by mass or more, 10% by mass or more, 12% by mass or more, 15% by mass or more. , 18% by mass or more, or 20% by mass or more.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized is 50% by mass or less, less than 50% by mass, 40% by mass or less, 30% by mass or less, 25% by mass or less, 20% by mass or less, and 18% by mass or less. , 15% by mass or less, 12% by mass or less, or 10% by mass or less. From these viewpoints, the amount of 2,3-dichloro-1,3-butadiene copolymerized is 1 to 50% by mass, 1 to 30% by mass, 1 to 20% by mass, 1 to 15% by mass, and 1 to 10% by mass. or , 20 to 30% by weight.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized in the chloroprene polymer of the chloroprene polymer latex B is the monomer unit in the chloroprene polymer from the viewpoint of easily obtaining excellent flexibility in the dip-molded coating. or 3% by mass or more based on the total 100% by mass of the chloroprene copolymerization amount and the 2,3-dichloro-1,3-butadiene copolymerization amount in the chloroprene polymer. If the 2,3-dichloro-1,3-butadiene copolymerization amount is 3% by mass or more, it is easy to obtain excellent flexibility in the dip-molded coating.
- the copolymerization amount of 2,3-dichloro-1,3-butadiene may be within the following ranges from the viewpoint of easily obtaining excellent flexibility in the dip-molded coating.
- 2,3-dichloro-1,3-butadiene copolymerization amount is 5% by mass or more, 8% by mass or more, 10% by mass or more, 12% by mass or more, 15% by mass or more, 18% by mass or more, or 20% by mass % or more.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized is 30% by mass or less, 25% by mass or less, 20% by mass or less, 18% by mass or less, 15% by mass or less, 12% by mass or less, and 10% by mass or less.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized is 3 to 30% by mass, 5 to 30% by mass, 10 to 30% by mass, 3 to 20% by mass, and 5 to 20% by mass. , 10-20% by weight, 3-15% by weight, 5-15% by weight, or 10-15% by weight.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized can be obtained by measuring the pyrolysis gas chromatograph of the chloroprene polymer obtained by freeze-drying the chloroprene polymer latex.
- the dried product (chloroprene polymer) obtained by freeze-drying the mixed chloroprene polymer latex composition according to the present embodiment is extracted with an ethanol/toluene azeotrope (an ethanol/toluene azeotrope defined in JIS K 6229).
- an ethanol/toluene azeotrope an ethanol/toluene azeotrope defined in JIS K 6229.
- the mass ratio b/a (total amount b/total amount a) of the total amount b of the salt of is 0.10 or more. When the mass ratio b/a is 0.10 or more, excellent breaking strength can be obtained.
- the mass ratio b/a is 0.20 or more, 0.30 or more, 0.40 or more, 0.50 or more, 0.60 or more, 0.70 or more, 0.20 or more, 0.30 or more, 0.40 or more, 0.50 or more, 0.60 or more, 0.70 or more, 0.20 or more, 0.30 or more, 0.40 or more, 0.50 or more, 0.60 or more, 0.70 or more. It may be 80 or more, 0.90 or more, 1.00 or more, 1.20 or more, 1.40 or more, or 1.60 or more.
- Mass ratio b/a is 2.00 or less, 1.80 or less, 1.60 or less, 1.40 or less, 1.20 or less, 1.00 or less, 0.90 or less, 0.80 or less, 0.70 0.60 or less, 0.50 or less, 0.40 or less, or 0.30 or less. From these points of view, the mass ratio b/a is 0.10-2.00, 0.10-1.20, 0.10-1.00, 0.10-0.80, 0.10-0.
- the ratio (mixing ratio) of the chloroprene polymer latex A is the solid content ratio, from the viewpoint of easily achieving both breaking strength and flexibility in the dip-molded coating obtained using the mixed chloroprene polymer latex composition.
- the following ranges may be used with respect to a total of 100 parts by mass of A and chloroprene polymer latex B.
- the proportion of the chloroprene polymer latex A is 0.5 parts by mass or more, 1 part by mass or more, 5 parts by mass or more, 10 parts by mass or more, 15 parts by mass or more, 20 parts by mass or more, 25 parts by mass or more, or 30 parts by mass. It may be more than part.
- the proportion of the chloroprene polymer latex A is 50 parts by mass or less, 40 parts by mass or less, 30 parts by mass or less, 25 parts by mass or less, 20 parts by mass or less, 15 parts by mass or less, 10 parts by mass or less, or 5 parts by mass or less.
- the ratio of the chloroprene polymer latex A is 0.5 to 50 parts by mass, 0.5 to 30 parts by mass, 0.5 to 25 parts by mass, 0.5 to 20 parts by mass, 0.5 to 15 parts by mass, 5 to 50 parts by mass, 5 to 30 parts by mass, 5 to 25 parts by mass, 5 to 20 parts by mass, 5 to 15 parts by mass, 10 to 50 parts by mass, 10 to 30 parts by mass, 10 to 25 parts by mass parts, 10 to 20 parts by weight, or 10 to 15 parts by weight.
- the mixed chloroprene polymer latex composition according to the present embodiment it is possible to obtain a chloroprene polymer dip-molded coating having high breaking strength and excellent flexibility without using sulfur and a vulcanization accelerator.
- the dip-molded coating obtained by vulcanizing the mixed chloroprene polymer latex composition at 130° C. for 4 hours without using sulfur and a vulcanization accelerator was measured according to JIS K 6251. gives a modulus at 100% elongation of 0.40 to 0.75 MPa and a breaking strength of 17 MPa or more.
- ASTM standard "D3577" for use in surgical gloves specifies a breaking strength of 17 MPa or more.
- the dip molded coating has excellent flexibility and sufficient mechanical strength without containing sulfur and vulcanization accelerators.
- sulfur or vulcanization accelerators are causative substances of type IV allergy that cause skin diseases such as dermatitis, so reducing or eliminating the use of sulfur and vulcanization accelerators is an important theme.
- eliminating the use of sulfur and vulcanization accelerators not only reduces allergies but also reduces costs. It would be desirable to have a chloroprene polymer latex composition that would yield a dip molded article exhibiting excellent strength.
- the dip-molded coating obtained from the mixed chloroprene polymer latex composition according to this embodiment may contain sulfur and/or a vulcanization accelerator.
- the dip-molded coatings, even without sulfur and vulcanization accelerators, have mechanical properties equal to or better than vulcanized dip-molded coatings obtained from conventional chloroprene polymer latexes. Therefore, the mixed chloroprene polymer latex composition according to the present embodiment is suitably used as a raw material for dip-molded coatings.
- the method for producing the chloroprene polymer latex A includes a polymerization step of emulsion polymerizing a monomer composition containing at least one selected from the group consisting of chloroprene and 2,3-dichloro-1,3-butadiene.
- the polymerization step may be a step of emulsion polymerization of chloroprene, 2,3-dichloro-1,3-butadiene and alkyl mercaptan to obtain a chloroprene polymer latex.
- the method for producing the chloroprene polymer latex B includes a polymerization step of emulsion polymerizing a monomer composition containing chloroprene and 2,3-dichloro-1,3-butadiene.
- the polymerization step may be a step of emulsion polymerization of chloroprene, 2,3-dichloro-1,3-butadiene and alkyl mercaptan to obtain a chloroprene polymer latex.
- the amount of 2,3-dichloro-1,3-butadiene copolymerized in the chloroprene polymer of the chloroprene polymer latex B is, as described above, 100% by mass of the total monomer units in the chloroprene polymer, or the chloroprene polymer. It may be 3 mass % or more (for example, 3 to 30 mass %) with respect to the total 100 mass % of chloroprene and 2,3-dichloro-1,3-butadiene in the medium.
- the amount (charged amount) of 2,3-dichloro-1,3-butadiene in the polymerization step (before the initiation of emulsion polymerization) is 100 parts by mass of the total amount of monomers for obtaining the chloroprene polymer, or It may be 3 parts by mass or more (for example, 3 to 30 parts by mass) with respect to a total of 100 parts by mass of chloroprene and 2,3-dichloro-1,3-butadiene.
- chain transfer agent used for emulsion polymerization is not particularly limited.
- chain transfer agents include long-chain alkylmercaptans such as n-dodecylmercaptan (1-dodecylmercaptan) and tert-dodecylmercaptan, dialkylxanthogen disulfides such as diisopropylxanthogen disulfide and diethylxanthogen disulfide, and iodoform.
- chain transfer agents generally used for emulsion polymerization of chloroprene can be used.
- the weight-average molecular weight can be adjusted by adjusting the amount (charged amount) of the chain transfer agent before the initiation of emulsion polymerization.
- the blending amount of the chain transfer agent for example, the blending amount of the mercaptan-based chain transfer agent (n-dodecylmercaptan, etc.)
- the blending amount of the chain transfer agent is based on a total of 100 parts by mass of chloroprene and 2,3-dichloro-1,3-butadiene. 0.50 to 10.0 parts by mass is preferred. This makes it easy to adjust the weight average molecular weight of the toluene-soluble component to 5,000 to 250,000, and to improve the flexibility of the dip-molded coating obtained by using the mixed chloroprene polymer latex composition.
- the amount (charged amount) of the chain transfer agent (eg, alkyl mercaptan) before the initiation of emulsion polymerization is based on a total of 100 parts by mass of chloroprene and 2,3-dichloro-1,3-butadiene. , preferably 0.01 to 0.1 parts by mass, more preferably 0.02 to 0.05 parts by mass.
- the amount of the chain transfer agent is 0.01 parts by mass or more, the storage stability of the latex is likely to be improved.
- the amount of the chain transfer agent is 0.1 part by mass or less, the amount of toluene-insoluble matter increases, and the strength of the dip-molded coating obtained using the mixed chloroprene polymer latex composition tends to increase.
- the emulsifier used for emulsion polymerization is preferably rosin acids, more preferably rosin acids containing abietic acid, neoabietic acid, parastric acid, levopimaric acid, and salts thereof, from the viewpoint of easily obtaining excellent breaking strength.
- rosin acids it is possible to prevent aggregation of rubber solids, pH fluctuations, etc. when blended with the base latex.
- emulsifiers include metal salts of aromatic sulfonic acid formalin condensate (for example, sodium salt of ⁇ -naphthalenesulfonic acid formalin condensate), sodium dodecylbenzenesulfonate, potassium dodecylbenzenesulfonate, sodium alkyldiphenyl ether sulfonate, alkyl Potassium diphenyl ether sulfonate, sodium polyoxyethylene alkyl ether sulfonate, sodium polyoxypropylene alkyl ether sulfonate, potassium polyoxyethylene alkyl ether sulfonate, potassium polyoxypropylene alkyl ether sulfonate and the like.
- aromatic sulfonic acid formalin condensate for example, sodium salt of ⁇ -naphthalenesulfonic acid formalin condensate
- sodium dodecylbenzenesulfonate sodium dodecylbenzenes
- the content of anionic surfactants other than rosin acid is preferably 0.2 to 1.0% by mass with respect to 100% by mass of the chloroprene polymer contained in the chloroprene polymer latex.
- the blending amount (charge amount) of the anionic surfactant excluding rosin acid before the start of emulsion polymerization is 0.2 per 100 parts by mass of chloroprene and 2,3-dichloro-1,3-butadiene in total. It is preferably within the range of up to 0.9 parts by mass.
- the pH of the aqueous emulsion at the start of emulsion polymerization is preferably 10.5 to 13.5.
- the aqueous emulsion refers to a mixed liquid of alkyl mercaptan, chloroprene, 2,3-dichloro-1,3-butadiene, etc. before the initiation of emulsion polymerization. , even if its composition varies.
- the pH of the aqueous emulsion at the start of emulsion polymerization is 10.5 or more, the polymerization reaction can be controlled more stably.
- the pH is 13.5 or less, an excessive increase in viscosity during polymerization is suppressed, and the polymerization reaction can be controlled more stably.
- the polymerization temperature for emulsion polymerization may be in the range of 5 to 55°C. When the polymerization temperature is 5°C or higher, the emulsion is difficult to freeze. When the polymerization temperature is 55°C or lower, it is easy to suppress evaporation and boiling of the chloroprene monomer.
- potassium persulfate As the polymerization initiator, potassium persulfate, benzoyl peroxide, ammonium persulfate, hydrogen peroxide, etc., which are used in normal radical polymerization, may be used.
- the polymerization conversion rate may range from 50 to 95%.
- the polymerization reaction can be terminated by adding a polymerization inhibitor.
- the polymerization conversion rate is 50% or more, the toluene-insoluble matter increases, the strength of the obtained dip-molded coating tends to increase, and the production cost is advantageous.
- the polymerization conversion rate is 95% or less, a decrease in polymerization reactivity due to a decrease in unreacted monomers can be avoided, and a decrease in productivity can be avoided.
- Polymerization inhibitors include diethylhydroxylamine, thiodiphenylamine, 4-tert-butylcatechol, 2,2'-methylenebis-4-methyl-6-tert-butylphenol, and the like. Unreacted monomers after completion of the emulsion polymerization can be removed by a conventional method such as distillation under reduced pressure.
- a freeze stabilizer emulsion stabilizer, viscosity modifier, antioxidant, antiseptic, etc. can be optionally added after polymerization.
- the dip-molded article according to the present embodiment is a dip-molded article using the mixed chloroprene polymer latex composition of the first embodiment described above. Dip molded alone (dip molded without mixing the mixed chloroprene polymer latex composition of the first embodiment with other chloroprene polymer latexes), or the mixed chloroprene polymer of the first embodiment The latex composition was blended with another chloroprene polymer latex and then dip-molded.
- the dip-molded article according to the present embodiment is a dip-molded article of the mixed chloroprene polymer latex composition of the first embodiment alone, or the mixed chloroprene polymer latex composition of the first embodiment and other It may be a dip molded product of a mixed latex composition obtained by mixing with a chloroprene polymer latex.
- the dip molded article according to the present embodiment has a low modulus at 100% elongation, is flexible, and is excellent in mechanical properties such as strength and elongation.
- the dip molded body according to this embodiment may be a glove, a balloon, a catheter or a boot.
- a method (molding method) for manufacturing the dip-molded body according to the present embodiment includes, for example, a coagulation liquid dipping method, but is not limited to this, and may be molded according to a conventional method.
- the dip molded product according to the present embodiment may not contain at least one selected from the group consisting of vulcanizing agents and vulcanization accelerators, and contains at least one selected from the group consisting of vulcanizing agents and vulcanization accelerators. It's okay. That is, the dip molded body according to the present embodiment includes an embodiment containing a vulcanizing agent and no vulcanization accelerator, an embodiment containing a vulcanization accelerator without a vulcanizing agent, and a vulcanizing agent and a vulcanization accelerator. and embodiments that are free of vulcanizing agents and vulcanization accelerators. Whether or not a vulcanizing agent and a vulcanization accelerator are blended may be determined according to the desired dip-molded product.
- vulcanizing agents include, but are not limited to, sulfur, zinc oxide, and magnesium oxide.
- the vulcanization accelerator acts with the vulcanizing agent to increase the vulcanization speed, shorten the vulcanization time, lower the vulcanization temperature, reduce the amount of vulcanizing agent, and improve the physical properties of the vulcanized rubber. It is a drug added for the purpose of A vulcanization accelerator generally refers to an agent that accelerates the sulfur vulcanization reaction.
- Vulcanization accelerators commonly used for vulcanization of chloroprene polymer latex include thiuram-based, dithiocarbamate-based, thiourea-based, guanidine-based, xanthate-based, thiazole-based, etc., but are limited to these. not to be
- the vulcanization accelerators may be used alone or in combination of two or more if necessary, but are not limited thereto.
- Thiuram-based vulcanization accelerators include tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetrabutylthiuram disulfide, tetrakis(2-ethylhexyl)thiuram disulfide, tetramethylthiuram monosulfide, and dipentamethylenethiuram tetrasulfide.
- Dithiocarbamate-based vulcanization accelerators include sodium dibutyldithiocarbamate, zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate, zinc N-ethyl-N-phenyldithiocarbamate, and zinc N-pentamethylenedithiocarbamate.
- copper dimethyldithiocarbamate, ferric dimethyldithiocarbamate, tellurium diethyldithiocarbamate and the like, and zinc dibutyldithiocarbamate is particularly preferably used.
- Thiourea-based vulcanization accelerators include ethylenethiourea, N,N'-diethylthiourea, trimethylthiourea, and N,N'-diphenylthiourea.
- Guanidine-based vulcanization accelerators include 1,3-diphenylguanidine, 1,3-di-o-tolylguanidine, 1-o-tolylbiguanide, and dicatechol borate di-o-tolylguanidine salts. .
- xanthate-based vulcanization accelerators examples include zinc butylxanthate and zinc isopropylxanthate.
- Thiazole-based vulcanization accelerators include 2-mercaptobenzothiazole, di-2-benzothiazolyl disulfide, 2-mercaptobenzothiazole zinc salt, cyclohexylamine salt of 2-mercaptobenzothiazole, 2-(4'- morpholinodithio)benzothiazole and the like.
- the dip molded body according to the present embodiment exhibits excellent mechanical properties regardless of the presence or absence of sulfur and vulcanization accelerators, but from the viewpoint of reducing allergies and reducing costs, sulfur and vulcanization accelerators are not included. things are preferred.
- the pH of the aqueous emulsion before the initiation of polymerization was 12.9. 0.1 part by mass of potassium persulfate was added as a polymerization initiator, and polymerization was carried out at a polymerization temperature of 20° C. under a nitrogen stream. When the polymerization conversion rate reached 85%, 0.01 part by mass of diethylhydroxylamine, a polymerization inhibitor, was added to terminate the polymerization to obtain a latex.
- chloroprene polymer latex A (mercaptan-modified chloroprene polymer latex) with a solid content of 55% was obtained by distilling the latex under reduced pressure to remove unreacted monomers and water.
- chloroprene polymer latex B 95 parts by mass of chloroprene monomer, 5 parts by mass of 2,3-dichloro-1,3-butadiene monomer, 0.04 part by mass of 1-dodecylmercaptan, and 90 parts by mass of pure water were placed in a polymerization can having an internal volume of 40 liters.
- potassium hydroxide 1.50 parts by mass
- sodium salt of ⁇ -naphthalenesulfonic acid formalin condensate (trade name “Demol N” , manufactured by Kao Corporation) was added.
- the pH of the aqueous emulsion before the initiation of polymerization was 13.2.
- 0.1 part by mass of potassium persulfate was added as a polymerization initiator, and polymerization was carried out at a polymerization temperature of 15° C. under a nitrogen stream.
- the polymerization conversion rate reached 70%, 0.01 parts by mass of diethylhydroxylamine, a polymerization inhibitor, was added to terminate the polymerization to obtain a latex.
- a chloroprene polymer latex B (mercaptan-modified chloroprene polymer latex) with a solid content of 55% was obtained by distilling the latex under reduced pressure to remove unreacted monomers and water.
- the total amount a of dehydroabietic acid, pimaric acid, isopimaric acid, dihydroabietic acid and salts thereof, and abietic acid, neo The total amount b of abietic acid, parastric acid, levopimaric acid and salts thereof was calculated, and the mass ratio b/a of the total amount b to the total amount a was calculated.
- the abietic acid component (abietic acid and its salts; the same applies to other resin acid components) is 31.2%, the neoabietic acid component is 0.8%, and the parastric acid component is 4.0%. , the levopimaric acid component was detected at 2.7%, and the total area of the conjugated resin acid component was 38.7%.
- the non-conjugated resin acid components 35.3% dehydroabietic acid component, 7.5% pimaric acid component, 3.2% isopimaric acid component, and 2.4% dihydroabietic acid component were detected. The total area of the resin acid component was 48.4%.
- the chloroprene polymers obtained by freeze-drying the chloroprene polymer latexes A and B were cut into 0.05 mg test pieces and measured by a pyrolysis gas chromatograph.
- the total amount of chloroprene and 2,3-dichloro-1,3-butadiene in the chloroprene polymer as the 2,3-dichloro-1,3-butadiene copolymerization amount of the chloroprene polymer latex measured by this pyrolysis gas chromatograph The chloroprene polymer latex A was 21% by mass and the chloroprene polymer latex B was 4.6% by mass with respect to 100% by mass. From this analysis value, the amount of 2,3-dichloro-1,3-butadiene copolymerized in the chloroprene polymer shows a general correlation with the amount of 2,3-dichloro-1,3-butadiene blended (amount charged). was confirmed.
- the total amount a of dehydroabietic acid, pimaric acid, isopimaric acid, dihydroabietic acid and salts thereof, and abietic acid, neo The total amount b of abietic acid, parastric acid, levopimaric acid and salts thereof was calculated, and the mass ratio b/a of the total amount b to the total amount a was calculated.
- the mass ratio b/a was 0.80.
- the aqueous dispersion contains 2 parts by mass of zinc oxide (a vulcanizing agent, trade name “zinc oxide type 2”, manufactured by Sakai Chemical Industry Co., Ltd.), a butylated reaction product of p-cresol and dicyclopentadiene (trade name “ Nocrac PBK”, manufactured by Ouchi Shinko Kagaku Kogyo Co., Ltd.) 2 parts by mass, sodium salt of ⁇ -naphthalenesulfonic acid formalin condensate (trade name "Demoll N", manufactured by Kao Corporation) 0.1 parts by mass, and water 13 parts by mass were mixed at 20° C. for 16 hours using a ceramic ball mill.
- zinc oxide a vulcanizing agent, trade name “zinc oxide type 2”, manufactured by Sakai Chemical Industry Co., Ltd.
- Nocrac PBK a butylated reaction product of p-cresol and dicyclopentadiene
- a ceramic cylinder with an outer diameter of 50 mm (manufactured by Shinko Co., Ltd.) was immersed in a coagulating liquid containing 62 parts by mass of water, 35 parts by mass of potassium nitrate tetrahydrate, and 3 parts by mass of calcium carbonate for 1 second. I took it out. After drying for 3 minutes at room temperature of 23° C., the cylinder was dipped in the molding composition for 10 seconds. Then, after washing with running water at 45° C. for 1 minute, vulcanization was performed at 130° C. for 4 hours to prepare a vulcanized film (immersion molding film, vulcanized film containing no sulfur and vulcanization accelerator) as an evaluation sample. . Evaluation was performed by peeling the vulcanized film from the outer peripheral surface of the cylinder.
- the dip-molded coatings (dip-molded bodies) obtained using the mixed latex compositions of Examples 1-9 had very low modulus at 100% elongation (very good flexibility) and excellent mechanical properties (breaking strength and breaking elongation).
- the weight-average molecular weight of the chloroprene polymer latex A was less than 5,000, and when an attempt was made to prepare a dip-molded film, the low-molecular-weight chloroprene polymer of the chloroprene polymer latex A bleed (bleed out). The tackiness was so severe that a dip-molded film could not be produced.
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Abstract
Description
まず、本発明の第一の実施形態に係るクロロプレン重合体ラテックス組成物について説明する。本実施形態に係るクロロプレン重合体ラテックス組成物(以下、「混合クロロプレン重合体ラテックス組成物」という)は、クロロプレン重合体ラテックスAとクロロプレン重合体ラテックスBとの混合物である。
クロロプレン重合体ラテックスAは、クロロプレン重合体を含有する。クロロプレン重合体は、クロロプレン(2-クロロ-1,3-ブタジエン)を単量体単位として有する重合体であり、クロロプレンの単独重合体、又は、クロロプレンと他の単量体との共重合体(クロロプレンと2,3-ジクロロ-1,3-ブタジエンとの共重合体等)であってよい。クロロプレン重合体ラテックスBは、クロロプレン重合体を含有し、当該クロロプレン重合体がクロロプレンと2,3-ジクロロ-1,3-ブタジエンとの共重合体を含む。
クロロプレン重合体のトルエン不溶分は、クロロプレン重合体ラテックスA,B、又は、混合クロロプレン重合体ラテックス組成物を凍結乾燥させて得られるクロロプレン重合体をトルエンで溶解した後に遠心分離を行い、さらに、200メッシュ金網を用いて不溶分(ゲル分)を分離した後に乾燥させて得られる乾燥物の質量を測定することで求められる。
クロロプレン重合体ラテックスAにおけるトルエン可溶分(トルエン可溶なゾル分)の重量平均分子量は、5,000~250,000である。重量平均分子量が250,000以下であると、低分子量ポリマーの可塑効果により、優れた柔軟性を示す浸漬成形被膜が得られる。重量平均分子量が5,000以上であると、浸漬成形被膜を好適に得ることができる。
下記の条件でGPC測定を行う。分子量の算出はポリスチレン換算で求める。
・ゲル浸透クロマトグラフィー(GPC)測定装置:東ソー株式会社製、ゲル浸透クロマトグラフ(HLC-8320)
・カラム:東ソー株式会社製、TSKgel ALPHA-M
・溶離液:テトラヒドロフラン(関東化学株式会社製)
・溶離液流量:1.0ml/min
・カラム温度:40℃
・検出方法:示差屈折率(RI)計
・検量線:標準ポリスチレンを用いて作成
クロロプレン重合体ラテックスAに含まれるクロロプレン重合体がクロロプレンと他の単量体との共重合体である場合、クロロプレン重合体におけるクロロプレン共重合量(クロロプレンの単量体単位の含有量;以下において同様)は、浸漬成形被膜において優れた柔軟性が得られやすい観点から、クロロプレン重合体中の単量体単位の全量100質量%、又は、クロロプレン重合体中のクロロプレン共重合量及び2,3-ジクロロ-1,3-ブタジエン共重合量の合計100質量%に対して、下記の範囲であってよい。クロロプレン共重合量は、99質量%以下、97質量%以下、95質量%以下、92質量%以下、90質量%以下、88質量%以下、85質量%以下、82質量%以下、又は、80質量%以下であってよい。クロロプレン共重合量は、50質量%以上、50質量%超、60質量%以上、70質量%以上、75質量%以上、80質量%以上、82質量%以上、85質量%以上、88質量%以上、又は、90質量%以上であってよい。これらの観点から、クロロプレン共重合量は、50~99質量%、70~99質量%、80~99質量%、85~99質量%、90~99質量%、50~90質量%、70~90質量%、80~90質量%、85~90質量%、50~85質量%、70~85質量%、80~85質量%、50~80質量%、又は、70~80質量%であってよい。
クロロプレン重合体ラテックスAに含まれるクロロプレン重合体がクロロプレンと他の単量体との共重合体である場合、クロロプレン重合体における2,3-ジクロロ-1,3-ブタジエン共重合量は、浸漬成形被膜において優れた柔軟性が得られやすい観点から、クロロプレン重合体中の単量体単位の全量100質量%、又は、クロロプレン重合体中のクロロプレン共重合量及び2,3-ジクロロ-1,3-ブタジエン共重合量の合計100質量%に対して、下記の範囲であってよい。2,3-ジクロロ-1,3-ブタジエン共重合量は、1質量%以上、3質量%以上、5質量%以上、8質量%以上、10質量%以上、12質量%以上、15質量%以上、18質量%以上、又は、20質量%以上であってよい。2,3-ジクロロ-1,3-ブタジエン共重合量は、50質量%以下、50質量%未満、40質量%以下、30質量%以下、25質量%以下、20質量%以下、18質量%以下、15質量%以下、12質量%以下、又は、10質量%以下であってよい。これらの観点から、2,3-ジクロロ-1,3-ブタジエン共重合量は、1~50質量%、1~30質量%、1~20質量%、1~15質量%、1~10質量%、10~50質量%、10~30質量%、10~20質量%、10~15質量%、15~50質量%、15~30質量%、15~20質量%、20~50質量%、又は、20~30質量%であってよい。
熱分解ガスクロマトグラフは以下の測定条件で実施できる。
・使用カラム:DB-5 0.25mmφ×30m(膜厚1.0μm)
・カラム温度:50℃→10℃/min→120℃→25℃/min→300℃
・注入口温度:270℃
・検出器温度:280℃
・試料量:0.05mg
本実施形態に係る混合クロロプレン重合体ラテックス組成物を凍結乾燥させて得られる乾燥物(クロロプレン重合体)からエタノール/トルエン共沸混合物(JIS K 6229で規定されるエタノール/トルエン共沸混合物)で抽出される抽出物のガスクロマトグラフ質量分析の測定結果において、デヒドロアビエチン酸、ピマール酸、イソピマール酸、ジヒドロアビエチン酸及びこれらの塩の合計量aに対するアビエチン酸、ネオアビエチン酸、パラストリン酸、レボピマール酸及びこれらの塩の合計量bの質量比b/a(合計量b/合計量a)は、0.10以上である。質量比b/aが0.10以上であることにより、優れた破断強度を得ることができる。
ガスクロマトグラフ質量分析は、以下の測定条件で実施できる。
・使用カラム:FFAP 0.32mmφ×25m(膜厚0.3μm)
・カラム温度:200℃→250℃
・昇温速度:10℃/min
・注入口温度:270℃
・注入量:1μL
・インターフェイス温度:270℃
・イオン源温度:270℃
・イオン化電流:50μA
・イオン化電圧:70eV
・検出器電圧:-1000V
・検出器電圧:EI法
クロロプレン重合体ラテックスAの割合(混合割合)は、混合クロロプレン重合体ラテックス組成物を用いて得られる浸漬成形被膜における破断強度と柔軟性を両立させやすい観点から、固形分比率で、クロロプレン重合体ラテックスA及びクロロプレン重合体ラテックスBの合計100質量部に対して、下記の範囲であってよい。クロロプレン重合体ラテックスAの割合は、0.5質量部以上、1質量部以上、5質量部以上、10質量部以上、15質量部以上、20質量部以上、25質量部以上、又は、30質量部以上であってよい。クロロプレン重合体ラテックスAの割合は、50質量部以下、40質量部以下、30質量部以下、25質量部以下、20質量部以下、15質量部以下、10質量部以下、又は、5質量部以下であってよい。これらの観点から、クロロプレン重合体ラテックスAの割合は、0.5~50質量部、0.5~30質量部、0.5~25質量部、0.5~20質量部、0.5~15質量部、5~50質量部、5~30質量部、5~25質量部、5~20質量部、5~15質量部、10~50質量部、10~30質量部、10~25質量部、10~20質量部、又は、10~15質量部であってよい。
本実施形態に係る混合クロロプレン重合体ラテックス組成物によれば、硫黄及び加硫促進剤を用いずとも、高い破断強度を有しつつ優れた柔軟性を有するクロロプレン重合体浸漬成形被膜を得ることができる。具体的には、硫黄及び加硫促進剤を用いることなく混合クロロプレン重合体ラテックス組成物を130℃で4時間加硫することにより得られる浸漬成形被膜は、JIS K 6251に準拠して測定したときに、100%伸長時モジュラス0.40~0.75MPa、及び、破断強度17MPa以上を与える。特に、手術用手袋用途におけるASTM規格「D3577」において、破断強度は17MPa以上と規定されている。当該浸漬成形被膜は、優れた柔軟性を備え、硫黄及び加硫促進剤を含まずとも十分な機械的強度を有している。
次に、クロロプレン重合体ラテックスA及びBの製造方法について説明する。
次に、本発明の第二の実施形態に係る浸漬成形体について説明する。本実施形態に係る浸漬成形体は、前述した第一の実施形態の混合クロロプレン重合体ラテックス組成物を用いた浸漬成形体であり、例えば、第一の実施形態の混合クロロプレン重合体ラテックス組成物を単独で浸漬成形したもの(第一の実施形態の混合クロロプレン重合体ラテックス組成物に他のクロロプレン重合体ラテックスを混合することなく浸漬成形したもの)、あるいは、第一の実施形態の混合クロロプレン重合体ラテックス組成物と、他のクロロプレン重合体ラテックスとをブレンドした後に浸漬成形したものである。すなわち、本実施形態に係る浸漬成形体は、第一の実施形態の混合クロロプレン重合体ラテックス組成物単独の浸漬成形体、又は、第一の実施形態の混合クロロプレン重合体ラテックス組成物と、他のクロロプレン重合体ラテックスとを混合して得られる混合ラテックス組成物の浸漬成形体であってよい。本実施形態に係る浸漬成形体は、100%伸長時のモジュラスが低く柔軟であり、且つ、強度、伸び等の機械的特性に優れている。本実施形態に係る浸漬成形体は、手袋、風船、カテーテル又は長靴であってよい。
(クロロプレン重合体ラテックスAの作製)
内容積40リットルの重合缶に、クロロプレン単量体80質量部、2,3-ジクロロ-1,3-ブタジエン単量体20質量部、1-ドデシルメルカプタン3質量部、純水90質量部、ロジン酸X(質量比b/a=0.80)4.5質量部、水酸化カリウム1.50質量部、及び、β-ナフタレンスルホン酸ホルマリン縮合物のナトリウム塩(商品名「デモールN」、花王株式会社製)0.50質量部を添加した。重合開始前の水性乳化液のpHは12.9であった。重合開始剤として過硫酸カリウム0.1質量部を添加し、重合温度20℃にて窒素気流下で重合を行った。重合転化率85%となった時点で、重合禁止剤であるジエチルヒドロキシルアミンを0.01質量部加えて重合を停止させ、ラテックスを得た。
内容積40リットルの重合缶に、クロロプレン単量体95質量部、2,3-ジクロロ-1,3-ブタジエン単量体5質量部、1-ドデシルメルカプタン0.04質量部、純水90質量部、ロジン酸X(質量比b/a=0.80)4.3質量部、水酸化カリウム1.50質量部、及び、β-ナフタレンスルホン酸ホルマリン縮合物のナトリウム塩(商品名「デモールN」、花王株式会社製)0.50質量部を添加した。重合開始前の水性乳化液のpHは13.2であった。重合開始剤として過硫酸カリウム0.1質量部を添加し、重合温度15℃にて窒素気流下で重合を行った。重合転化率70%となった時点で、重合禁止剤であるジエチルヒドロキシルアミンを0.01質量部加えて重合を停止させ、ラテックスを得た。
上述のロジン酸Xをエタノール/トルエン共沸混合物(JIS K 6229で規定されるエタノール/トルエン共沸混合物、ETA溶液)に溶解させて1.5%溶液を調製した後に塩酸処理を施し、ガスクロマトグラフ質量分析を用いて測定した。ガスクロマトグラフ質量分析で検出される総ピーク面積値に対する面積百分率を含有量とみなして、デヒドロアビエチン酸、ピマール酸、イソピマール酸、ジヒドロアビエチン酸及びこれらの塩の合計量a、並びに、アビエチン酸、ネオアビエチン酸、パラストリン酸、レボピマール酸及びこれらの塩の合計量bを算出し、合計量aに対する合計量bの質量比b/aを算出した。
上記クロロプレン重合体ラテックスA及びBを凍結乾燥させて得られるクロロプレン重合体1gを2mm角に裁断することにより小片を得た後、この小片をコニカルビーカーに入れてトルエンで16時間溶解した。その後、遠心分離し、200メッシュ金網を用いてゲル分を分離した後に乾燥させて得られる乾燥物の質量を測定することによりトルエン不溶分を算出した。クロロプレン重合体ラテックスAのトルエン不溶分は1.1質量%であり、クロロプレン重合体ラテックスBのトルエン不溶分は82質量%であった。
上記クロロプレン重合体ラテックスAをトルエンに溶解させた際の溶出分(ゾル分)について、ゲル浸透クロマトグラフィーによる重量平均分子量をポリスチレン換算で測定したところ、24,000であった。
上記クロロプレン重合体ラテックスA及びBを凍結乾燥させて得られるクロロプレン重合体を0.05mgの試験片に裁断し、熱分解ガスクロマトグラフにて測定を実施した。この熱分解ガスクロマトグラフにて測定したクロロプレン重合体ラテックスの2,3-ジクロロ-1,3-ブタジエン共重合量として、クロロプレン重合体中のクロロプレン及び2,3-ジクロロ-1,3-ブタジエンの合計100質量%に対して、クロロプレン重合体ラテックスAは21質量%であり、クロロプレン重合体ラテックスBは4.6質量%であった。本分析値より、クロロプレン重合体中の2,3-ジクロロ-1,3-ブタジエン共重合量は、2,3-ジクロロ-1,3-ブタジエンの配合量(仕込み量)と概ね相関を示すことが確認された。
クロロプレン重合体ラテックスAとクロロプレン重合体ラテックスBとの合計を100質量部とした際に、クロロプレン重合体ラテックスAを10質量部、及び、クロロプレン重合体ラテックスBを90質量部の比率(固形分比率)で攪拌混合させることで混合ラテックス組成物(混合クロロプレン重合体ラテックス組成物)を得た。
上記混合ラテックス組成物を凍結乾燥させて得られる乾燥物(クロロプレン重合体)3gを2mm角に裁断することにより小片を得た。この小片をコンデンサー付属のナス形フラスコに入れ、エタノール/トルエン共沸混合物(JIS K 6229で規定されるエタノール/トルエン共沸混合物、ETA溶液)に溶解させて1.5%溶液を調製した。その後に塩酸処理を施し、ガスクロマトグラフ質量分析を用いて測定した。ガスクロマトグラフ質量分析で検出される総ピーク面積値に対する面積百分率を含有量とみなして、デヒドロアビエチン酸、ピマール酸、イソピマール酸、ジヒドロアビエチン酸及びこれらの塩の合計量a、並びに、アビエチン酸、ネオアビエチン酸、パラストリン酸、レボピマール酸及びこれらの塩の合計量bを算出し、合計量aに対する合計量bの質量比b/aを算出した。質量比b/aは0.80であった。
上記混合ラテックス組成物を凍結乾燥させて得られるクロロプレン重合体1gを2mm角に裁断することにより小片を得た後、この小片をコニカルビーカーに入れてトルエンで16時間溶解した。その後、遠心分離し、200メッシュ金網を用いてゲル分を分離した後に乾燥させて得られる乾燥物の質量を測定することによりトルエン不溶分を算出した。混合ラテックス組成物のトルエン不溶分は72質量%であった。
上記混合ラテックス組成物の固形分100質量部に、水分散液4.1質量部を混合した後に水を加えて配合物の全体の固形分濃度を30質量%に調整して、硫黄及び加硫促進剤を含まない成形用組成物を作製した。上記水分散液は、酸化亜鉛(加硫剤、商品名「酸化亜鉛2種」、堺化学工業株式会社製)2質量部、p-クレゾールとジシクロペンタジエンのブチル化反応生成物(商品名「ノクラックPBK」、大内新興化学工業株式会社製)2質量部、β-ナフタレンスルホン酸ホルマリン縮合物のナトリウム塩(商品名「デモールN」、花王株式会社製)0.1質量部、及び、水13質量部を、陶器製ボールミルを用いて、20℃で16時間混合し、調製した。
上記加硫フィルムについて、JIS K 6251に準拠して100%伸長時モジュラス、破断強度及び破断伸びを測定した。
表1~表3に示した条件により、実施例1と同様に加硫フィルムを作製及び評価した。実施例6~9及び比較例4~5において、ロジン酸Y(質量比b/a=1.87)を使用した。実施例5~9及び比較例3において、ロジン酸Z(質量比b/a=0;アビエチン酸、ネオアビエチン酸、パラストリン酸、レボピマール酸及びこれらの塩が検出されず)を使用した。
実施例1~9、比較例1~5及び参考例1~2の結果を表1~表3に示す。
Claims (7)
- クロロプレン重合体ラテックスAとクロロプレン重合体ラテックスBとの混合物であるクロロプレン重合体ラテックス組成物であって、
前記クロロプレン重合体ラテックスA及び前記クロロプレン重合体ラテックスBがクロロプレン重合体を含有し、
前記クロロプレン重合体ラテックスBの前記クロロプレン重合体がクロロプレンと2,3-ジクロロ-1,3-ブタジエンとの共重合体を含み、
前記クロロプレン重合体ラテックスBの前記クロロプレン重合体における2,3-ジクロロ-1,3-ブタジエン共重合量が、クロロプレン及び2,3-ジクロロ-1,3-ブタジエンの合計100質量%に対して3質量%以上であり、
前記クロロプレン重合体ラテックスBの前記クロロプレン重合体のトルエン不溶分が70質量%以上であり、
前記クロロプレン重合体ラテックスAにおけるトルエン可溶分の重量平均分子量が5,000~250,000であり、
前記クロロプレン重合体ラテックス組成物を凍結乾燥させて得られる乾燥物からエタノール/トルエン共沸混合物(JIS K 6229で規定されるエタノール/トルエン共沸混合物)で抽出される抽出物のガスクロマトグラフ質量分析の測定結果において、デヒドロアビエチン酸、ピマール酸、イソピマール酸、ジヒドロアビエチン酸及びこれらの塩の合計量aに対するアビエチン酸、ネオアビエチン酸、パラストリン酸、レボピマール酸及びこれらの塩の合計量bの質量比b/aが0.10以上である、クロロプレン重合体ラテックス組成物。 - 前記クロロプレン重合体ラテックスAの前記クロロプレン重合体のトルエン不溶分が10質量%以下である、請求項1に記載のクロロプレン重合体ラテックス組成物。
- 前記クロロプレン重合体ラテックスBの前記クロロプレン重合体のトルエン不溶分が70~95質量%である、請求項1又は2に記載のクロロプレン重合体ラテックス組成物。
- 前記クロロプレン重合体ラテックスAの割合が、前記クロロプレン重合体ラテックスA及び前記クロロプレン重合体ラテックスBの合計100質量部に対して0.5~30質量部であり、
当該クロロプレン重合体ラテックス組成物に含まれるクロロプレン重合体のトルエン不溶分が50~85質量%である、請求項1~3のいずれか一項に記載のクロロプレン重合体ラテックス組成物。 - 請求項1~4のいずれか一項に記載のクロロプレン重合体ラテックス組成物を用いた、浸漬成形体。
- 硫黄及び加硫促進剤を含まない、請求項5に記載の浸漬成形体。
- 手袋、風船、カテーテル又は長靴である、請求項6に記載の浸漬成形体。
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WO2023190143A1 (ja) * | 2022-03-31 | 2023-10-05 | デンカ株式会社 | 浸漬成形物、クロロプレン系重合体及び浸漬成形物の製造方法 |
WO2023190144A1 (ja) * | 2022-03-31 | 2023-10-05 | デンカ株式会社 | クロロプレン系重合体及び浸漬成形物 |
WO2023190145A1 (ja) * | 2022-03-31 | 2023-10-05 | デンカ株式会社 | クロロプレン系重合体ラテックス及び浸漬成形物 |
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JP2014114342A (ja) | 2012-12-07 | 2014-06-26 | Denki Kagaku Kogyo Kk | ポリクロロプレンラテックス、ポリクロロプレンラテックス組成物及び浸漬成形製品 |
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CN113840850A (zh) * | 2019-07-05 | 2021-12-24 | 电化株式会社 | 氯丁二烯共聚物胶乳及其制造方法、硫化物、以及浸渍成型体及其制造方法 |
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WO2023190144A1 (ja) * | 2022-03-31 | 2023-10-05 | デンカ株式会社 | クロロプレン系重合体及び浸漬成形物 |
WO2023190145A1 (ja) * | 2022-03-31 | 2023-10-05 | デンカ株式会社 | クロロプレン系重合体ラテックス及び浸漬成形物 |
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