Abstract: A membrane electrode assembly for a fuel cell is described. The materials for the membrane electrode assembly are formed from sulfonated polymers. A polymer dispersion ink containing the sulfonated polymer and a mixture of solvents is used to form the electrodes on the exchange membrane. The dispersion ink allows for the electrodes to be formed directly on the exchange membrane without significantly dissolving the exchange membrane.

Abstract: A polyarylene sulfide h as a narrow molecular weight distribution and a high molecular weight and high purity which is industrially useful, wherein the polyarylene sulfide has a weight average molecular weight of 10,000 or more, and weight loss when heated, ?Wr=(W1?W2)/W1×100?0.18(%) (wherein ?Wr is weight loss ratio (%), W1 is sample weight when arrived at 100° C. and W2 is sample weight when arrived at 330° C.). Its production method includes a polyarylene sulfide prepolymer which contains a cyclic polyarylene sulfide at least 50 wt % or more, and of which weight average molecular weight is less than 10,000 is heated to be converted to a high polymer of which weight average molecular weight is 10,000 or more.

Abstract: A conductive polymer having high conductivity and a solid electrolytic capacitor having low ESR are provided. A conductive polymer is synthesized using as a monomer a compound of a dimer to a decamer in which 3-alkyl five-membered heterocyclic rings are bonded at positions 2 and 5, being sterically controlled. Further, this conductive polymer is used as the solid electrolyte of a solid electrolytic capacitor.

Abstract: The invention relates to producing monomer, oligomer and polymer non-fluorinated, partially fluorinated or perfluorinated sulphonic acids by reacting halogenated, low-molecular weight, oligomer or macromolecular arenes with (hydrogen) sulphites, dithionites, sulphides or other reducing sulfur salts, possibly by oxidising sulphur-containing arene intermediates which are formed at a sulphur oxidation degree less than +6 by means of appropriate oxidation agents with formation of corresponding sulphonate functional groups (sulphonic acid, sulfohalogenide, sulphonamide and sulphonic acid ester groups).

Abstract: Terminated silane polymers obtained by addition reactions between an organic silicon derivative and the terminal functional groups of linear or branched polymers obtained by Michael polyaddition reactions of sulphydric acid (H2S) with organic compounds which have at least two alkylenic double bonds activated by the presence, in the alpha position with respect to each alkylenic bond, of an electronegative group.

Abstract: An inexpensive and durable polyelectrolyte composition includes both an aromatic polymer containing carbonyl linkages and/or sulfonyl linkages in the backbone chain and bearing cation-exchange groups and a fused salt exhibits a high ionic conductivity even in the absence of water or a solvent. The aromatic polymer is preferably an aromatic polyether sulfone comprising specific structural units and bearing cation-exchange groups, an aromatic polyether ketone comprising specific structural units and bearing cation-exchange groups, an aromatic polyether sulfone block copolymer consisting of at least one hydrophilic segment bearing cation-exchange groups and at least one hydrophobic segment free from cation-exchange groups, and/or an aromatic polyether ketone block copolymer consisting of at least one hydrophilic segment bearing cation-exchange groups and at least one hydrophobic segment free from cation-exchange groups.

Abstract: A membrane-electrode assembly for polymer electrolyte fuel cells which is excellent in water repellency and gas diffusivity and which exhibits a high output power density, can be obtained by using, as an electrolyte material for polymer electrolyte fuel cells, a fluoropolymer obtained by contacting a fluoropolymer which is excellent in gas diffusivity and which has alicyclic structures in its main chain and further has sulfonic acid groups, with fluorine gas for fluorination to increase water repellency and stabilize the molecule ends.

Abstract: An aromatic polyether comprising structural units derived from a halosulfone sulfonate having structure (I): wherein R1 is a C3-C25 aromatic radical, a C3-C25 cycloaliphatic radical, or a C1-C10 aliphatic radical; M is hydrogen or a charge balancing cation; Y1 is independently at each occurrence a halogen; “t” is an integer having a value of 1 or 2; “s” is an integer having a value 0 to 3, “b” is an integer having a value 1 to 4; and “c” is an integer having a value 1 to 20. Also provided are methods of preparing the aromatic polyethers, and compositions including the aromatic polyethers.

Abstract: Sulfonated polyethersulfones and polymer compositions comprising sulfonated polyethersulfones and at least one inorganic heteropolyacid are useful as proton exchange membranes for fuel cells. The polyethersulfones include structural units derived from at least one biphenol monomer and a monomer of formula I wherein X is O, S or NR1; Y is N or CR5; R1, R2, R3 and R4 are independently hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, arylalkyl or substituted arylalkyl, or R3 and R4, taken together, form a 5- or 6-membered substituted or unsubstituted aliphatic or aromatic ring; R5 is hydrogen, alkyl, substituted alkyl, aryl, substituted aryl, alkylaryl, substituted alkylaryl, arylalkyl or substituted arylalkyl; and L is a direct bond or a divalent aromatic linker containing 6-12 carbons.

Abstract: A membrane electrode assembly for a fuel cell is described. The materials for the membrane electrode assembly are formed from sulfonated polymers. A polymer dispersion ink containing the sulfonated polymer and a mixture of solvents is used to form the electrodes on the exchange membrane. The dispersion ink allows for the electrodes to be formed directly on the exchange membrane without significantly dissolving the exchange membrane.

Abstract: This disclosure relates to compositions and methods for using such compositions to provide protective coatings, particularly of electronic components. Fired-on-foil ceramic capacitors coated with a polybenzoxazole encapsulant which may be embedded in printed wiring boards are disclosed.

Abstract: Aromatic sulfonimide ionene polymers useful as membranes in electrochemical cells are prepared.

Abstract: Compositions and methods for making compositions such as RF(R?)nQ are provided. The RF group can include at least two —CF3 groups, the R? group can be a group having at least two carbons, n can be at least 1, and the Q group can include one or more atoms of the periodic table of elements. RF-intermediates (RF(RT)nQg); Surfactants (RF(RT)nQs); Foam stabilizers (RF(RT)IIQFS); Metal complexes (RF(RT)IIQMC); Phosphate ester (RF(RT)HQPE); Polymers (RF(RT)IIQMU); Monomers (RF(RT)IIQM); Urethanes (RF(R?)nQu); and/or Glycols (RF(RT)IIQH) and methods for making the same are provided.

Abstract: The invention provides an antistatic treatment agent having an ability of preventing resist film thinning phenomenon in a chemically amplified resist, an antistatic film, a coated article and a pattern forming method using such antistatic treatment agent, in particular, the invention provides an antistatic treatment agent comprising an aqueous solvent-soluble electroconductive polymer, a diamine (divalent) or polyamine (polyvalent) aliphatic basic compound and an anionic surfactant, an antistatic film, a coated article and a pattern forming method using such antistatic treatment agent. As the aqueous solvent-soluble electroconductive polymer, a ?-conjugated electroconductive polymer having a Brönsted acid group is a sulfonic acid group is preferred and it is preferable that the amount of the diamine (divalent) or polyamine (polyvalent) aliphatic basic compound be from 0.1 to 75 mol % based on the total number of moles of the basic compounds.

Abstract: Process for preparing an antistatic for olefin polymerization by contacting an antistatically acting compound comprising at least one hydrogen atom bound to a nonmetallic heteroatom with at least one metal alkyl in an amount which is sufficient to react completely with the at least one hydrogen atom bound to a heteroatom, wherein the antistatically acting compound and the metal alkyl are each present in a concentration of at least 0.01% by weight during contacting.

Abstract: An assembled hematin is formed by depositing hematin on an electrically charged substrate in one or more layers alternating with one or more layers of polyelectrolyte, preferably a cationic polymer. In a method for polymerizing an aromatic monomer, the assembled hematin is contacted with the monomer and a template, preferably an anionic polymer. In a method for polymerizing aniline, the aniline, sulfonated multi walled carbon nano tubes, PEG hematin and a reaction initiator are dispersed in water.

Abstract: A technique is described for the preparation of polymers according to a process in which the starting compound of formula (I) is polymerized in the presence of a base in an organic solvent. No end chain controlling agents are required during the polymerisation to obtain soluble precursor polymers. The precursor polymer such obtained comprises structural units of the formula (II). In a next step, the precursor polymer (II) is subjected to a conversion reaction towards a soluble or insoluble conjugated polymer by thermal treatment. The arylene or heteroarylene polymer comprises structural units of the formula III. In this process the dithiocarbamate group acts as a leaving group and permits the formation of a precursor polymer of structural formula (II), which has an average molecular weight from 5000 to 1000000 Dalton and is soluble in common organic solvents. The precursor polymer with structural units of formula (II) is thermally converted to the conjugated polymer with structural formula (III).

Abstract: The invention provides ion-conductive copolymers that can be used to fabricate proton exchange membranes (PEM's), catalyst coated proton exchange membranes (CCM's) and membrane electrode assemblies (MEA's) which are useful in fuel cells and their application in electronic devices, power sources and vehicles. The ion-conductive copolymers comprise one or more ion-conductive oligomers randomly positioned in a polymeric backbone that is not ion-conductive.

Abstract: Base soluble polymer comprising at least one sulfonyl group where at least one carbon atom at ?-position and/or ?-position and/or ?-position with respect to the sulfonyl group has a hydroxyl group, where the hydroxyl group is protected or unprotected are described.

Abstract: To provide a fluorosulfonyl group-containing monomer having a high polymerization reactivity and plural fluorosulfonyl groups. Further, to provide a fluorosulfonyl group-containing polymer and a sulfonic acid group-containing polymer, obtained by using the monomer. A perfluoro(2-methylene-1,3-dioxolane) derivative which is represented by the following formula (3) and which has two fluorosulfonyl groups, and its production process and its synthetic intermediate. A fluorosulfonyl group-containing polymer having monomer units represented by the following formula (3U) obtained by polymerizing the compound (3) by itself or with a comonomer, and a sulfonic acid group-containing polymer having the following units (5U) obtained by hydrolyzing a fluorosulfonyl group of the polymer. In the following formulae, each of Rf1 and Rf2 which are independent of each other, is a C1-8 perfluoroalkylene group which may have an etheric oxygen atom between carbon atoms.

Abstract: Photoreactive dendrimers comprising a core portion, branching units and terminal groups, wherein at least one terminal group and/or branching unit is a photoreactive group and wherein the photo reactive groups include preferably cinnamates, coumarins, benzylidenephthalimidines, benzylideneacetophenones, diphenylacetylenes stilbazoles, uracyl, quinolinone, maleinimides, or cinnamylidene acetic acid derivatives and are able to undergo photocyclization, in particular [2+2]-photocyclization.

Abstract: The present invention relates to oxonium salts having [(Ro)3O]+ cations and sulfonium salts having [(Ro)3S]+ cations, where Ro denotes straight-chain or branched alkyl groups having 1-8 C atoms or phenyl which is unsubstituted or substituted by Ro, ORo, N(Ro)2, CN or halogen, and anions selected from the group of [PFx(CyF2y+1?zHz)6?x]? anions, where 2?x?5, 1?y?8 and 0?z?2y+1, or anions selected from the group of [BFn(CN)4?n]? anions, where n=0, 1 , 2 or 3, or anions selected from the group of [(Rf1SO2)2N]? anions or anions selected from the group of [BFwRf24?w]? anions, to processes for the preparation thereof, and to the use thereof, in particular for the preparation of ionic liquids.

Abstract: A dihalobiphenyl compound represented by the formula (1): wherein A represents an amino group substituted with one or two C1-C20 hydrocarbon groups or a C1-C20 alkoxy group, R1 represents a fluorine atom, a C1-C20 alkyl group, etc., X1 represents a chlorine atom, a bromine atom or an iodine atom, an k represents an integer of 0 to 3, and a polyarylene comprising a repeating unit represented by the formula (2): wherein A, R1 and k represent the same meanings as defined above.

Abstract: Deaggregated substituted and unsubstituted polyparaphenylenes, polyparaphenylevevinyles, polyanilines, polyazines, polythiophenes, poly-p-phenylene sulfides, polyfuranes, polypyrroles, polyselenophene, polyacetylenes formed from soluble precursors and combinations thereof and copolymers thereof and methods of fabrication are described. The deaggregated polymer molecules when subsequently doped show higher electrical conductivity. Agents such as lithium chloride, m-cresol and nonylphenol are used to deaggregate the polymer molecules. The deaggregating agents can be added prior to or during doping the molecules.

Abstract: The present invention relates to a hard surface cleaning composition comprising a copolymer, wherein said copolymer comprises a zwitterionic unit A or a mixture thereof and another unit B or a mixture thereof, wherein said unit A comprises a betaine group or a mixture thereof and wherein said betaine group of said unit A is a sulphobetaine group or a mixture thereof, and wherein said unit B is derived from vinyl-pyrrolidone.

Abstract: The present invention relates to halogen-free, oligomeric or polymeric phosphonic acids made up of units of the general formula (I) —[(O)m—{R1(X)n(Y)o}pR1(X)q]r—[(O)s—R5(X)t]v—??(I), where: X is —P?O(OH)2, Y is carbonyl or sulfonyl, R1, R5 are, independently of one another, divalent or polyvalent, substituted or unsubstituted, heteroatom-free or heteroatom- comprising aromatic radicals, m, o, s are each, independently of one another, 0 or 1, n, q, t are each, independently of one another, 0 or an integer from 1 to 8, with n and s not simultaneously being 0, r, v are each, independently of one another, from 0 to 1, with the sum of r and v being from 0.95 to 1.

Abstract: A polymer electrolyte membrane made of a polymer has a low electrical resistance, high heat resistance and is strong against repeats of swelling and shrinkage. Thus, a membrane/electrode assembly for polymer electrolyte fuel cells having high power generation performance and excellent in durability can be provided. For a polymer electrolyte membrane 15 or for a catalyst layer 11 constituting electrodes 13 and 14, a polymer comprising units (U1) and units (U2) is used: Q1, Q2, Q3: a perfluoroalkylene group which may have —O— or the like; Rf1, Rf2: a perfluoroalkyl group which may have —O—; X1, X2: an oxygen atom or the like; a, b: 0 or the like; Y1, Y2: a fluorine atom or a monovalent perfluoroorganic group; and s, t: 0 to 1.

Abstract: The present invention relates to novel diepoxides having the formulas I. and II. R*SO2N(A)RN(A)SO2R* where A=2,3-epoxypropyl, R* is a monovalent hydrocarbon radical or an inertly substituted hydrocarbon radical and R is a divalent hydrocarbon radical or an inertly substituted divalent hydrocarbon radical. The epoxies are useful in preparing novel epoxide resins.

Abstract: The present invention mainly relates to a solid electrolyte of fully conjugated, water-soluble rigid-rod polymer with articulated backbone for isotropic ionic conductivity. The present invention further provides a design and a method for synthesizing the solid electrolyte as described above. A battery, fuel cell or super-capacitor comprising the solid electrolyte is also provided.

Abstract: A polyarylethersulfone polymer composition comprising a polyarylethersulfone having reduced yellowness and high light transmittance is provided. The composition includes an organic phosphorous-containing compound and at least one of the following two additives: a colorant, and an optical brightener. The polyarylethersulfone composition of the present invention is used to form molded articles suitable for food and beverage service, medical components, and lighting components.

Abstract: The invention relates to a transparent substrate with low birefringence. The transparent substrate comprises polyimide having a repeat unit of formula (I) and has a birefringence below 0.005: , wherein each A of the repeat unit, being the same or different, represents an aromatic or aliphatic group, and at least one A is an aromatic or aliphatic group containing sulfonyl functionality; each B of the repeated unit, being the same or different, represents an aromatic or cycloaliphatic group; and n is an integer greater than one.

Abstract: A dihalobenzene compound represented by the formula (1): wherein A represents a C3-C20 alkoxy group etc., R1 represents a hydrogen atom, a fluorine atom, a C1-C20 alkyl group, etc., X1 represents a chlorine atom, etc., m represents 1 or 2, and k represents 4-m, and a polyarylene comprising a repeating unit represented by the formula (2): wherein A, R1, m and k represent the same meanings as defined above.

Abstract: Sulfonated polymers are made by the direct polymerization of a sulfonated monomer to form the sulfonated polymers. The types of sulfonated polymers may include polysulfones or polyimides. The sulfonated polymers can be formed into membranes that may be used in proton exchange membrane fuel cells or as ion exchange membranes. The membranes formed from the sulfonated polymers exhibit improved properties over that of Nafion®. A heteropoly acid may be added to the sulfonated polymer to form a nanocomposite membrane in which the heteropoly acid is highly dispersed. The addition of a heteropoly acid to the sulfonated polymer increases the thermal stability of the membrane, enhances the conductivity above 100° C., and reduces the water uptake of the membrane.

Abstract: A technique is described for the preparation of polymers according to a process in which the starting compound of formula (I) is polymerized in the presence of a base in an organic solvent. No end chain controlling agents are required during the polymerisation to obtain soluble precursor polymers. The precursor polymer such obtained comprises structural units of the formula (II). In a next step, the precursor polymer (II) is subjected to a conversion reaction towards a soluble or insoluble conjugated polymer by thermal treatment. The arylene or heteroarylene polymer comprises structural units of the formula III. In this process the dithiocarbamate group acts as a leaving group and permits the formation of a precursor polymer of structural formula (II), which has an average molecular weight from 5000 to 1000000 Dalton and is soluble in common organic solvents. The precursor polymer with structural units of formula (II) is thermally converted to the conjugated polymer with structural formula (III).

Abstract: To provide an amino group-containing water-soluble copolymer having a high chelating performance and clay dispersancy and a method of producing the amino-group containing water-soluble copolymer efficiently and with high productivity. A water-soluble polymer containing an amino group-containing monomer unit, wherein the water-soluble polymer has a molecular weight distribution of 12 or less, and a method of producing the water-soluble polymer according to any one of claims 1 to 4, wherein the method comprises a step of polymerizing an amino group-containing allyl monomer using an initiator containing a heavy metal ion and sulfurous acid (sulfite), hydrogensulfite or hydrogen peroxide.

Abstract: The invention relates to polymeric resin blends containing polyelectrolyte resins blended into a polymer or copolymer matrix. Specifically, the polyelectrolyte resins are (co)polymers without hydrolyzable groups. The matrix polymer is a tough, and highly chemical-resistant (co)polymer, preferably a fluoropolymer. The polymeric resin blend is useful for forming films, and especially films useful for MEAs for use in fuel cells.

Abstract: Provided are a conducting polymer film composition comprising a graft copolymer of a self-doped conducting polymer and an organic opto-electronic device comprising a conducting polymer film formed of the above-mentioned composition. In the graft copolymer, the conducting polymer and a polyacid are connected to each other via chemical binding. Therefore, the composition of the present invention can be used in organic opto-electronic devices with minimal or no dedoping occurring from heat generated inside the device. As a result, the present invention can improve efficiency and life-time of the organic opto-electronic device.

Abstract: A polymer compound comprising a repeating unit of the following formula (1) and which is useful as a light emitting material or charge transporting material and excellent in heat resistance, fluorescent intensity and the like: (wherein, ring A and ring B represent each independently an aromatic hydrocarbon ring optionally having a substituent, at least one of ring A and ring B is an aromatic hydrocarbon ring composed of a plurality of condensed benzene rings, Rw and Rx represent each independently a hydrogen atom, alkyl group, alkoxy group or the like, and Rw and Rx may mutually bond to form a ring).

Abstract: Polythioether amine resin compounds and compositions comprising the same are disclosed.

Abstract: The present invention provides an elastomeric fluoropolymer excellent in productivity and crosslinkability and a method of producing the same. The present invention is an elastomeric fluoropolymer having a vinyl group-containing fluorinated emulsifier-derived unit (A) and a unit (B) derived from a cure site monomer (b1) and/or bromine atom- and/or iodine atom-containing saturated aliphatic compound (b2), wherein the vinyl group-containing fluorinated emulsifier is a compound having a radical polymerizable unsaturated bond and a hydrophilic group within the molecule.

Abstract: To provide: a hydrophilized polyalkylene glycol which is preferably used in various applications, and sufficiently exhibits high performances such as detergency; a production method thereof; and an application thereof. A hydrophilized polyalkylene glycol represented by the following formula (1): in the formula, X1 and Y1 being different from each other, and each representing a hydrogen atom, —SO3M, —S—CH2—CH2—SO3M, —PO3M2, or —S—(CH2)t—COOM; R1 to R6 representing a hydrogen atom or an alkyl group; R7 representing a hydrogen atom, an alkyl group, an aryl group, a polyhydric alcohol group, Z1 or Z2 represented by the following formula (2-2) or (2-2); p, q, r, and s representing a valency; in the formula, X2 and Y2 being different from each other, and each representing a hydrogen atom, —SO3M, —S—CH2—CH2—SO3M, —PO3M2, or —S—(CH2)t—COOM; R8 and R9 representing a hydrogen atom or an alkyl group; and R10 representing an alkyl group or an aryl group.

Abstract: A polysulfone composition is provided having a total luminous light transmittance of 84% or greater when measured on 0.1 inch thick specimens using ASTM D-1003. The specimens also meet at least one of the following two conditions: 1) a yellowness index (YI) of less than about 5.0 as measured according to ASTM D-1925 on 0.1 inch thick specimens, or 2) a color factor (CF) of less than about 25, wherein CF is defined by the following equation: CF=270[(x+y)sample?(x+y)air]/t, wherein x and y are chromaticity coordinates measured in transmittance mode and t is sample thickness in inches. Another polysulfone composition is provided comprising a polysulfone, an organic phosphorous-containing melt stabilizer, and at least one of the following additives: a blue to violet dye, and an organic optical brightener. The polysulfone composition of the present invention is used to form transparent molded articles such as ophthalmic lenses.

Abstract: Aromatic sulfonimide ionene polymers useful as membranes in electrochemical cells are prepared.

Abstract: Hydrolytically and thermo-oxidatively stable sulfonated polyarylenes include the structural element —X—Ar(SO3M)n-Y—. The aromatic ring carrying the sulfonic acid group is substituted exclusively by electron-acceptor bridge groups X and Y and, if applicable, by other non-electron-donor substituents. Their synthesis and application are also included.

Abstract: A method for producing a non-specific adsorption inhibitor includes reacting (A) a tosylated compound of polyoxyethylene monomethyl ether with (B) a polyamine having either an amino group or imino group (—NH—), or both, in total of 3 to 12.

Abstract: Novel polyethersulfone compositions have been discovered which incorporate structural subunits derived from sulfonated bis(halophenyl)sulfones, dihydroxy terphenyls, and/or bis(hydroxyphenyl)pyridines. The sulfonated polyethersulfones show promise as materials for use in polymer electrolyte membranes (PEMs) in fuel cells owing to their high proton conductivities (0.02-0.07 S/cm at 20° C. and 100 percent humidity). In addition, a novel unsulfonated thermoplastic polyethersulfone comprising structural subunits derived from a non-sulfonated bis(halophenyl)sulfone bis4-fluorophenyl)sulfone and 4,4?-dihydroxyphenyl-2,6-pyridine (CAS No. 171820-16-9) is disclosed.

Abstract: A proton conducting polymer includes a polymer backbone and a heterocyclic compound attached to the polymer backbone. The heterocyclic compound includes a sulfonyl functionality bonded to heterocyclic compound.

Abstract: A composition of a polyaniline conductive solution includes an aniline monomer solution, an aqueous solution, and an oxidizing initiator. In the composition, the aniline monomer solution comprises at least one kind of aniline monomers. The aqueous solution comprises an organic acid salt and water. After the aniline monomer solution and the aqueous solution are mixed together, a mix solution is formed. Moreover, the oxidizing initiator is used for catalyzing the polymerization of the aniline monomers. Meanwhile, an application and a method of manufacturing the polyaniline conductive solution are also disclosed in the specification.

Abstract: The present invention discloses a nucleophilic acyl substitution-based polymerization catalyzed by mononuclear oxometallic complexes. In the first place, the first monomers with a plurality of carboxyl groups, and the second monomers with a plurality of protic nucleophilic groups are provided, wherein the protic nucleophilic groups comprise hydroxyl, amine, or thiol group. Next, catalyzed by the mentioned mononuclear oxometallic complex, the first monomers and the second monomers are polymerized into the designed polymer. On the other hand, this invention discloses another nucleophilic acyl substitution-based polymerization catalyzed by mononuclear oxometallic complexes. In the first place, monomers with at least one carboxyl (phosphonyl) group and at least one masked protic nucleophilic group are provided. Then, monomers are polymerized into the designed polymer, catalyzed by the mentioned mononuclear oxometallic complexes.

Abstract: To provide a polychloroprene-base latex having improved adhesiveness and water resistance over conventional polychloroprene-base latex adhesives. A polychloroprene-base latex containing 2% or less by weight of a conventional emulsifier, and an acid functional group-terminated polychloroprene-type polymer represented by the following formula (1) or a polychloroprene-base random copolymer with hydrophilic group, and a method for producing the polychloroprene-base latex: (polychloroprene-type polymer)-S—R—X ??(1) (wherein X represents a carboxyl group or its salt; represents an alkyl group, an aryl group, a substituted alkyl group or a substituted aryl group).