Abstract: Described herein are polyester polymer compositions including a polyester polymer, a white pigment and hydroxyapatite. It was surprisingly discovered that polyester polymer compositions including hydroxyapatite maintain outstanding retention of reflectance after prolonged exposure to heat and light, while having significantly reduced microblistering and increased mechanical performance relative to analogous polyester polymer compositions including a non-calcium phosphate salt. Accordingly, in some embodiments, the polymer compositions can be desirably incorporated into light emitting diode (“LED”) components.

Abstract: The invention relates to a mixture containing as component A at least one organic phosphinic acid salt and as component B at least one alkali metal stannate (M?2SnO3), alkali metal hydroxyl stannate (M?2Sn(OH)6), alkaline earth metal stannate (M?SnO3) and/or alkaline earth metal hydroxy stannate (M?Sn(OH)6). The invention relates also to the use of such a mixture.

Abstract: A polyamide composition comprising a polyamide; a plurality of inorganic fibers; and a flame retardant system comprising a zinc phosphinate and a nitrogen-containing polyphosphate is provided. At thicknesses of from about 0.4 to about 3.2 millimeters, the composition exhibits a Glow Wire Ignition Temperature of about 775° C. or more as determined in accordance with IEC-60695-2-13:2010; a Glow Wire End Product Temperature (without flame) of about 750° C. or more as determined in accordance with IEC-60335-1:2010; a Glow Wire Flammability Index of about 850° C. or more as determined in accordance with IEC-60695-2-12:2010; a V0 rating as determined in accordance with UL94; and/or a comparative tracking index of about 550 volts or more as determined in accordance with IEC 60112:2003.

Abstract: The invention relates to a composition obtainable by mixing polycarbonate, unsized talc and a specific anhydride-modified alpha-olefin polymer, wherein the amounts of the talc and the specific anhydride-modified alpha-olefin polymer are matched to one another such that, for every 10 parts by weight of the talc, 0.10 to 1.4 parts by weight of the anhydride-modified alpha-olefin polymer are used. It has been shown that in situ sizing of talc with the wax can minimize the degradation of the polycarbonate only in the course of mixing with the polycarbonate and, at the same time, properties such as multiaxial impact resistance and flowability can be improved.

Abstract: The present invention relates to a carbon composite material and a method for producing the same, and more particularly, to a carbon composite material capable of improving electrostatic dispersibility and flame retardancy, and a method for producing the same. The carbon composite material according to the present invention can be effectively applied to products requiring conductivity and flame retardancy.

Abstract: The invention relates to additive mixtures for plastics containing phosphinic acid of the formula (I) as component A, wherein R1 and R2 mean ethyl, M is Al, Fe, TiOp or Zn, m means 2 to <4, preferably 2 or 3, and p=(4?m)/2 is a compound selected from the group of Al, Fe, TiOp or Zn salts of ethylbutylphosphinic acid, dibutylphosphinic acid, ethylhexylphosphinic acid, butylhexylphosphinic acid and/or dihexylphosphinic acid as component B, phosphonic acid salt of formula (II) as component C, wherein R3 means ethyl, Met is Al, Fe, TiOq or Zn, n means 2 to 3, and q=(4?n)/2, and antimony, tin and/or indium as component D. Polymer compositions containing said additive mixtures are characterized by exceptional flame protection and by very good laser markability or laser weldability.

Abstract: A composition contains the following components (A), (B), and (C), the component (A) being at least one melamine salt selected from the group consisting of melamine orthophosphate, melamine pyrophosphate, and melamine polyphosphate, the component (B) being at least one piperazine salt selected from the group consisting of piperazine orthophosphate, piperazine pyrophosphate, and piperazine polyphosphate, and the component (C) being a monohydrate of alumina. As disclosed, it is possible to provide a composition that can impart excellent levels of processability/moldability and flame retardancy to a resin by being mixed with the resin.

Abstract: A silicone prosthetic liner for use with a prosthetic assembly that acts as the interface between the residual limb of an amputee and the socket assembly. The prosthetic liner comprises an open proximal end, a closed distal end, and sidewalls comprising an inner layer of molded silicone. The silicone is molded over a mandrel that has been sandblasted using #36 grit at 100 psi so as to form microcraters and reduce the coefficient of static friction.

Abstract: A composite material having at least two layers of reinforcing fibers impregnated with a curable resin; an interlaminar region formed between adjacent layers of reinforcing fibers; and a combination of polymeric toughening particles and fire-retardant particles in the interlaminar region.

Abstract: The present invention provides an insulation film, comprising a film upper layer and a film lower layer, wherein both of the film upper layer and film lower layer are made of a PC or PET material, the PC or PET material contains a flame retardant to meet the flame retardance and puncture resistance property thereof; a film intermediate layer located between the film upper layer and the film lower layer, the film intermediate layer is made of the blends of PP and/or PE and PC and/or PET; an upper surface of the film intermediate layer is bound together with a lower surface of the film upper layer, a lower surface of the film intermediate layer is bound together with an upper surface of the film lower layer.

Abstract: The present invention provides an aqueous coating composition that provides coatings with improved hydrophilic stain repellency.

Abstract: A composition including a polymer including at least one of an amic acid structural unit and an imide structural unit, inorganic particles, and a compound represented by Chemical Formula 1, a polymer-inorganic particle composite prepared from the composition, an article, and an optical device including the article: In Chemical Formula 1, R1 is a linear or branched, substituted or unsubstituted C1 to C30 alkyl group, a substituted or unsubstituted C3 to C10 cycloalkyl group, a substituted or unsubstituted C6 to C30 aryl group, or a combination thereof, and n is an integer of 1 or more.

Abstract: Provided is a polycarbonate resin composition, including: a polycarbonate resin (A) containing a polycarbonate-polyorganosiloxane copolymer (A-1) having a specific structure; a copolymer (B) having constituent units derived from acrylonitrile and styrene, and being free of a constituent unit derived from methyl methacrylate; and a copolymer (C) having constituent units derived from butadiene and methyl methacrylate, in which: a content of the polyorganosiloxane block moiety in the entire resin composition is from 0.1 mass % to 10 mass %; a total of a content of the constituent unit derived from the acrylonitrile in the entire resin composition and a content of the constituent unit derived from the styrene in the entire resin composition is from 8 mass % to 45 mass %; a content of the constituent unit derived from the butadiene in the entire resin composition is from 3 mass % to 10 mass %; and the (A) has a viscosity-average molecular weight (Mv) of from 20,000 to 25,000.

Abstract: This thermoplastic resin composition of the present invention comprises: approximately 100 parts by weight of a polycarbonate resin; approximately 1 to approximately 20 parts by weight of a rubber-modified vinyl-based copolymer resin; approximately 10 to approximately 30 parts by weight of a phosphorous-based flame retardant agent; approximately 3 to approximately 12 parts by weight of calcium carbonate; approximately 10 to approximately 40 parts by weight of talc; approximately 5 to approximately 11 parts by weight of wollastonite; and approximately 0.01 to approximately 5 parts by weight of a black pigment. The weight ratio of the calcium carbonate to the talc is approximately 1:1.5 to approximately 1:3.5, and the weight ratio of the talc to the wollastonite is approximately 1:0.3 to approximately 1:0.7.

Abstract: A resin composition includes 5 to 82 parts by weight of an aromatic polyester, 0 to 50 parts by weight of an aromatic polycarbonate, 10 to 90 parts by weight of a highly heat-resistant aromatic polycarbonate, 0 to 10 parts by weight of a graft-copolymer, 0 to 10 parts by weight of an ethylene copolymer, 2.5 to 50 parts by weight of a silicate filler, 0 to 10 parts by weight of an electric conductive filler, and 0 to 2 parts by weight of a phosphorus compound wherein the total amount of the components are 100 parts by weight. The total amount of the graft-copolymer and the ethylene copolymer is from 0.5 to 10 parts by weight, the silicate filler is at least one compound selected from mica and kaolin, and the resin composition has a deflection temperature under load of 130° C. or higher.

Abstract: Provided are a resin composition and shaped product having excellent low-temperature impact resistance, chemical resistance, and tracking resistance, and having rigidity enabling adoption for mechanism components and structures. The resin composition contains (a) a polyphenylene ether resin, and further contains: (b-1) a hydrogenated block copolymer, and/or modified product thereof, having a peak molecular weight of 80,000 to 200,000 and (b-2) a hydrogenated block copolymer, and/or modified product thereof, having a peak molecular weight of at least 10,000 and less than 80,000; and/or (c) an olefinic polymer formed from an olefin other than propylene. The (a) component forms a continuous phase, polymer block B has a glass transition temperature of ?50° C. or lower, the (c) component has a brittleness temperature of ?50° C. or lower, and the composition does not substantially contain (g) polypropylene resin and has a flexural modulus of 1,600 MPa or more as measured in accordance with ISO 178.

Abstract: Polymer compositions, such as polyamide-based compositions, include melamine cyanurate, nepheline syenite, and glass fibres.

Abstract: A thermoplastic composition including a resin phase and 10% to 55%, especially 25% to 45% of glass fibers by weight of the composition is disclosed. The resin phase includes a polysiloxane block copolymer including polydimethylsiloxane blocks and polycarbonate blocks derived from bisphenol A. The resin phase further includes a polycarbonate and has between 2.0 wt % and 10 wt % by weight of siloxane. The thermoplastic composition has (i) a notched Izod impact strength of at least 150 Joules per meter measured at 23° C. according to ASTM D256, (ii) a tensile strength greater than 95 MPa as determined by ASTM D638, (iii) a tensile modulus greater than 10,900 MPa as determined by ASTM D638 and (iv) an unnotched Izod impact strength greater than 775 Joules per meter measured at 23° C. according to ASTM D256.

Abstract: A support material for use in an additive manufacturing system, which includes a thermoplastic copolymer polymerized from monomers comprising acid-functional monomers having carboxylic acid groups, and one or more non-acid-functional monomers, where a portion of the carboxylic acid groups are neutralized with a base having an alkali metal cation. The thermoplastic copolymer has a high glass transition temperature and melt processing temperature, and is thermally stable at its melt processing temperature. The neutralized thermoplastic copolymer is soluble in an alkaline aqueous solution.

Abstract: A method for preparing fire resistant polymeric materials including, providing at least one first polyphenol having three or more phenolic groups, reacting at least one first polyphenol having three or more phenolic groups with at least one halophosphate and at least one first base to produce at least one second phenol having at least one phosphate group, and converting at least one second phenol having at least one phosphate group to a thermoplastic or thermosetting fire resistant polymeric material.

Abstract: A composition comprises, based on the total weight of the composition, 50 wt % to 90 wt % of a polyetherimide; and 10 wt % to 50 wt % of a filler comprising talc, titanium dioxide, zirconium oxide, neutral aluminum oxide, or a combination comprising at least one of the foregoing; wherein the composition has a number of drops to tracking at 250 volts of greater than or equal to 50 drops determined according to ASTM D-3638-85.

Abstract: Flame retardant mixtures comprising as component (A) 30% to 99.9% by weight of dialkylphosphinic salts of the formula (II), a and b may be the same or different and are each independently 1 to 9, and where the carbon chains may be linear, branched or cyclic and M is Mg, Ca, Al, Sb, Sn, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K and/or a protonated nitrogen base and m is 1 to 4, as component (B) 0.

Abstract: The present invention provides an insulation film (100), comprising a film upper layer (101) and a film lower layer (103), wherein both of the film upper layer (101) and film lower layer (103) are made of a PC or PET material, the PC or PET material contains a flame retardant to meet the flame retardance and puncture resistance property thereof; a film intermediate layer (102) located between the film upper layer (101) and the film lower layer (103), the film intermediate layer (102) is made of the blends of PP and/or PE and PC and/or PET; an upper surface of the film intermediate layer (102) is bound together with a lower surface of the film upper layer (101), a lower surface of the film intermediate layer (102) is bound together with an upper surface of the film lower layer (103).

Abstract: A stabilizer for producing a polyester resin comprises a phosphate ester composition which includes a phosphate ester compound having Formula (I), wherein X1 represents and X2 represents H or wherein R1 and R2 are independently selected from the group consisting of a linear C2-C4 alkylene group, a branched C3-C4 alkylene group, and a combination thereof.

Abstract: The present invention provides a composition comprising a polycarbonate, an infrared (IR) reflective additive and an epoxy-functional silicone, wherein the composition exhibits a reduced melt flow change over a comparable compound not containing an epoxy-functional silicone.

Abstract: A halogen-free flame retardant mixture containing between 1-99 wt. % of a component A and between 1-99 wt. % of a component B. Component A comprises between 85-99.995 wt.-% of a solid diethylphosphinic acid salt of the metals Mg, Ca, Al, Sb, SN, Ge, Ti, Fe, Zr, Zn, Ce, Bi, Sr, Mn, Li, Na, K and/or a protonated nitrogen base and between 0.005-15 wt.-% of non-combustible additives and component B is in the form of an aluminum phosphite.

Abstract: A resin composition that can exhibit good heat resistance and/or insulation properties includes (A) a polycarbonate resin, (B) a vinyl-based copolymer, (C) a fluorinated polyolefin and (D) a phosphorus-based flame retardant represented by Chemical Formula 1: wherein, in Chemical Formula 1, R6, R7, R9 and R10 are the same or different and are each independently a C6 to C20 aryl group or C1 to C14 alkyl-substituted C6 to C20 aryl group, R8 is biphenyl, and n is an integer ranging from 1 to 5.

Abstract: In a curable composition that contains at least one polymer having at least one terminal group of the general formula (I) -An-R—SiXYZ??(I), at least one cyclic compound that contains at least one structural motif of formula (II) as a constituent of the ring structure; and at least one cyclohexanedicarboxylic acid dialkyl ester in which the alkyl residues of the ester groups each, mutually independently, contain 1 to 20 carbon atoms. The curable composition can be used as an adhesive, sealant, and/or coating material. A combination of a cyclohexanedicarboxylic acid dialkyl ester, in which the alkyl residues of the ester groups each, mutually independently, contain 1 to 20 carbon atoms and a cyclic compound that contains at least one structural motif of the general formula (II) as a constituent of the ring structure, as a plasticizer/curing catalyst system in curable compositions.

Abstract: Provided are a thermoplastic polyurethane resin composition that achieves excellent flame retardancy, a conductor covering material having excellent characteristics, and manufacturing methods therefor. A thermoplastic polyurethane resin composition and a conductor covering material (20) according to embodiments of the present invention each include: 100 parts by weight of a resin component formed of 58.1 parts by weight or more and 73.9 parts by weight or less of a thermoplastic polyurethane resin, and 26.1 parts by weight or more and 41.9 parts by weight or less of core-shell polymer particles; and 42 parts by weight or more and 87 parts by weight or less of a phosphoric acid ester-based flame retardant.

Abstract: This disclosure provides high-efficiency and low-energy-consumption synthetic methods of a series of phosphorus-nitrogen-based intumescent flame retardants and the use thereof in paint flame retarding. 1 part by weight of a phosphorization agent and 0.5-4.0 parts by weight of a nitrogen-containing foaming agent are uniformly mixed and stirred at room temperature, and an amount of water is further added to emit heat and initiate reaction. 0.5-3.0 parts by weight of a charring agent and 0.5-4.0 parts by weight of a hydroxy-containing polyfuctional crosslinking agent are then added, and reacted with stirring. An amine compound is finally added for neutralization until pH value is 5-8, and solid liquid separation is performed. The solid portion is dried to obtain a main body portion of a phosphorus-nitrogen-based intumescent flame retardant. The resultant filtrate is diluted with ?-? volume of water, and a flame retardant product is obtained.

Abstract: A disclosed flame-retardant polypropylene composition contains: a random copolymer polypropylene as a synthetic resin component; and a component (A) and a component (B) as flame retardant components, the component (A) being one or more melamine salts selected from the group consisting of melamine orthophosphate, melamine pyrophosphate, and melamine polyphosphate, and the component (B) being one or more piperazine salts selected from the group consisting of piperazine orthophosphate, piperazine pyrophosphate, and piperazine polyphosphate. Furthermore, as a flame retardant component, the flame-retardant polypropylene composition preferably further contains zinc oxide as a component (C). Also, as a synthetic resin component, the flame-retardant polypropylene composition preferably further contains a styrene-based thermoplastic elastomer.

Abstract: In one or more embodiments, the present invention provides a novel approach to the addition of plasticizers for softening TPUs, i.e., lowering the durometer and the melt viscosity. This approach involves incorporating bonded sulfonate groups with quaternary ammonium counterions into the TPU. In one or more embodiments of the present invention, the softening of TPU is achieved by incorporating an ionic diol, such as N,N-bis (2-hydoxyethyl)-2-aminoethane-sulfonic acid (BES), coupled with various bulky alkyl ammonium cations, during the chain extension step of the TPU synthesis. It is believed that that steric hindrance of the bulky quaternary ammonium groups weakens the dipole-dipole interactions of the sulfonate groups and/or lowers the crystallinity of the hard block, thereby creating additional free volume that softens the polymer and lowers the melt viscosity.

Abstract: A glass-fiber-reinforced polycarbonate resin composition comprising: (A) 100 parts by weight of a resin component consisting of a polycarbonate-polydiorganosiloxane copolymer resin and an aromatic polycarbonate resin; (B) 10-300 parts by weight of glass fibers having a flat cross section which have an average value of a long diameter of the fiber cross section of 10-50 ?m and an average value of a ratio of the long diameter to a short diameter (long diameter/short diameter) of 1.5-8; (C) 5-25 parts by weight of an adhesion improving agent, which is at least one resin selected from the group consisting of a phenoxy resin, an epoxy resin, a glycidyl methacrylate resin, a polybutylene terephthalate resin, a polyethylene terephthalate resin and a polyarylate resin; (D) 5-45 parts by weight of a phosphorus-based flame retardant; and (E) 0.01-3 parts by weight of a fluorine-containing dripping inhibitor, wherein the polydiorganosiloxane is 0.05-4.00 wt % in the composition.

Abstract: A composite material containing a polymer composition and a very low concentration of carbon nanofillers, in particular carbon nanotubes, having improved mechanical properties. The method for producing said composite material and to the different uses thereof. The use of carbon nanofillers at a concentration of between 0.1 ppm and 99 ppm in order to improve mechanical properties, in particular the tensile properties of a polymer matrix encasing at least one polymer selected from a thermoplastic polymer alone or mixed with an elastomer resin base, while facilitating the shaping thereof into composite parts using any suitable technique, in particular injection, extrusion, compression or molding, and while improving the electrostatic dissipation capability thereof.

Abstract: A polymer composition includes: about 20 wt % to about 80 wt % of a polycarbonate polymer; about 1 wt % to about 20 wt % of a polycarbonate-siloxane copolymer; about 15 wt % to about 35 wt % of a reinforcing filler having a tensile modulus of at least about 150 GPa; and about 4 wt % to about 20 wt % of a flame retardant comprising phosphorous. The polymer composition demonstrates a flexural modulus in an amount equal to or greater than about 10 GPa. Methods of forming a polymer composition and blended thermoplastic compositions are also described.

Abstract: A one-pack moisture-curing composition of the present technology contains a preliminary composition, an adhesiveness-imparting agent containing a compound (A) and/or a compound (B), a first catalyst containing a compound (C) and/or dibutyltin bis(pentadione), and a second catalyst containing a dimorpholinodiethylether.

Abstract: The present invention relates to a process for producing a polyester resin composition, including the step of mixing a polyester resin (A), an aromatic carbodiimide (B) and an aliphatic polycarbodiimide (C) at a temperature not lower than a melting temperature of the polyester resin, in which the polyester resin (A) and the aromatic carbodiimide (B) are mixed in the presence of the aliphatic polycarbodiimide (C).

Abstract: The present invention provides a polycarbonate composition containing hydroxy aluminum hydroxide which exhibits increased gloss level. This effect is seen in polycarbonate blend or blends of polycarbonate and polyesters. This additive is effective in increasing the gloss level of polymer or polymer blend with gloss levels lower than 80 at 20 degree incident angle.

Abstract: The present invention relates to a process for the production of thermoplastic molding compositions, in particular styrene copolymer compositions, to a process for production of these, and also to use thereof. The thermoplastic molding compositions produced by a process of the invention offer improved temperature-resistance and mechanical properties, which have better flow properties than known molding compositions.

Abstract: A thermoplastic resin composition having good balance among impact resistance, flame retardancy, heat resistance and flowability all of which are required for thin molded articles high-dimensionally. The flame retardant resin composition comprises 100 parts by weight of a resin component comprising (A) a polycarbonate resin and (B) a polycarbonate-polydiorganosiloxane copolymer resin obtained by copolymerizing a dihydric phenol with a hydroxyaryl-terminated polydiorganosiloxane, (C) 3 to 35 parts by weight of an organic phosphorus-based flame retardant or 0.005 to 5 parts by weight of an organic metal salt-based flame retardant, (D) 0.1 to 30 parts by weight of a silicate mineral and (E) 0.1 to 3 parts by weight of a dripping inhibitor, and, if necessary, (F) 3 to 45 parts by weight of a styrene resin wherein the polydiorganosiloxane content of the component (B) in the composition is 0.2 to 0.6 wt %.

Abstract: The present invention relates to a reinforced resin composition for plating bases having excellent moldability, mechanical strengths, and plating ability, as well as being capable of improving the surface appearance of the molded article after plating. The reinforced resin composition for plating bases of the present invention includes: graft copolymer (A) in which a graft chain (A2) is grafted to a rubber polymer (A1) a matrix polymer (B) which includes one or more types of polymers selected from the group consisting of a vinyl-based copolymer (B-1), a polycarbonate resin (B-2), and a polyester resin (B-3); an inorganic filler (D); and a glycidyl ether unit-containing polymer (E). The content of the rubber polymer (A1) is from 5 to 25% by mass, relative to 100% by mass of the total amount of the component of (A) and the component of the matrix polymer (B).

Abstract: The invention concerns polymer compositions comprising 20-80 weight percent polycarbonate polymer, 15-40 weight percent filler and 4-20% flame retardant and articles comprising same.

Abstract: Polymeric blends having improved flame retardance properties and good ductility at low temperatures are disclosed. The blend is formed from (A) a photoactive additive containing a photoactive group derived from a monofunctional benzophenone; and (B) a polymer resin which is different from the photoactive additive. The additive can be a compound, oligomer, or polymer. When exposed to ultraviolet light, crosslinking will occur between the photoactive additive and the polymer resin, enhancing the chemical resistance and flame retardance while maintaining ductility.

Abstract: Blend membranes based on polybenzimidazole (PBI) and polymeric ionic liquids (PILs), wherein said PBI and aliphatic PIL blend enhances H+ and OH? ions conductivity, are provided. In particular, the blend membrane includes polybenzimidazole (PBI) and poly (diallyl dimethyl ammonium) trifluoromethane sulphonate with enhanced proton and hydroxyl ion conductivity.

Abstract: The present invention is a new additive material that is physically blended with polymeric material to create at least a partially biodegradable product.

Abstract: Provided is a compounding resin composition containing a compatibilizer, based on polyalkylene carbonate and polyolefin or biodegradable polyester. According to the present invention, a polyalkylene carbonate resin composition capable of improving mechanical properties such as tensile strength, elongation, tearing strength, and the like, or physical properties such as adhesive force, oxygen and moisture barrier properties, heat stability, flexibility, and the like, by preparing and applying the compatibilizer for improving compatibility of the compounding resin, and a multilayer film and a molded product manufactured using the same may be provided.

Abstract: Disclosed herein are compositions comprising polyamides, thermoplastic polyimides, and inorganic fillers. The compositions can also comprise a flame retardant additive. Also disclosed are materials and devices made thereof. This abstract is intended as a scanning tool for purposes of searching in the particular art and is not intended to be limiting of the present invention.

Abstract: The present invention concerns the preparation of an anion binder for a solid alkaline fuel cell which enhances durability to electrochemical reactions and makes the production of electrode slurry easy. A method of preparing an anion binder for a solid alkaline fuel cell includes: (A) mixing an electrolytic monomer of quaternary ammonium salts having a cation group, a bisacrylicamide crosslinking agent having a tertiary amino group, and water together by stirring; (B) mixing the mixture with a photoinitiator; (C) interposing the solution between polyethylene terephthalate films and irradiating the solution with ultraviolet light for crosslinking and polymerization; and (D) pulverizing crosslinked polymerized resin to a nano size.

Abstract: The invention relates to a process for the preparation of phosphonium sulfonates, particularly tetraalkylphosphonium fluoroalkylsulfonates, in the presence of amine-type bases.

Abstract: An object of the present invention is to provide a novel copolymer useful as a dispersing agent for a pigment or the like. The novel copolymer contains: a block chain (A) comprising at least one repeating unit selected from the group consisting of a repeating unit having a tertiary amino group and a repeating unit having a quaternary ammonium salt group; and a block chain (B) comprising a repeating unit having an acidic group and a repeating unit represented by the following formula (I) (wherein R1 represents a hydrogen atom or a C1-C3 alkyl group; and R2 represents an aliphatic hydrocarbon group or an alicyclic hydrocarbon group), wherein the repeating unit represented by formula (I) has a copolymerization ratio of 90 mass % or more in the block chain (B).