Abstract: A process for preparing an RPET polymer blend component comprises providing a quantity of RPET flakes, comminuting the RPET flakes to prepare RPET particles having an average mean particle size from about 500 microns to about 5 microns, adding at least one specialty additive to the RPET particles, and mixing the RPET particles and specialty additive, to prepare a homogeneous blend of RPET carrier and specialty additive.

Abstract: The present invention relates to a cellulose acylate film having a high modulus of elasticity and a high surface hardness. The cellulose acylate film of the present invention is characterized by containing 1 vol % to 99 vol % of a metal oxide having an average particle size of 1 nm to 400 nm. The metal oxide used here is preferably a metal oxide having a Mohs hardness of at least 7, and specific examples thereof include aluminum oxide and silicon dioxide. This metal oxide may be subjected to a surface treatment. Furthermore, a functional thin film such as a hardcoat layer may be formed on the cellulose acylate film containing the metal oxide.

Abstract: The polyolefin resin composition of the present invention includes 100 parts by weight polypropylene, 5 to 45 parts by weight inorganic filler, and 2 to 20 parts by weight silicon-grafted polyethylene. The polyolefin resin composition of the present invention is useful as a material of construction for various kinds of housings for electronic appliances and automobile parts since the resin exhibits better scratch resistance, resin fluidity, and moldability than prior art polyolefin resin compositions while maintaining mechanical properties.

Abstract: An adhesive composition for bonding of semiconductor chips to their chip mounting components comprising a curable polymer composition that comprises a spherical filler having an average particle size from greater than 100 to 1,000 &mgr;m and an aspect ratio of 1 to 1.5. Semiconductor devices according to this invention are characterized in that a semiconductor chip therein is bonded to the mounting component for said chip by the aforementioned adhesive.

Abstract: The invention relates to a powdery pigment preparation containing a pigment which is dispersed in an acrylate resin and which is characterized in that the acrylate resin has an average molar mass Mw ranging from 40000 to 80000 g/mol and is a copolymer comprised of 50 to 65 mol % ethyl methacrylate, of 30 to 45 mol % butyl methacrylate, and of 0.5 to 5 mol % methacrylic acid. The powdery pigment preparation can be used for dying films, particularly those made of polymethyl methacrylate. The films do not have any specks nor holes.

Abstract: Compound or salts thereof suitable for use as a binder for mineral fibers, for example glass or stone wool, said compound containing a carboxylic acid group and/or a &bgr;-hydroxyalkyl amide group.

Abstract: The invention relates to composition for crosslinking phenol-formaldehyde, phenol-resorcinol-formaldehyde, resorcinol-formaldehyde, tannin-formaldehyde, and similar thermosetting resins with a reactant nitroparaffin derivative, a pH adjuster, a viscosity controller, a polymerization shortstop, and water for use in Reinforced Thermal Plastic (RTP) Composite applications.

Abstract: An electrically conductive thermoplastic composition with a superior ability to be heated rapidly in an electromagnetic field comprises a polyetherimide resin, a polyester resin, and electrically conductive filler. Such compositions display good dimensional stability at elevated temperatures especially when heated rapidly using electromagnetic radiation, which renders them useful in articles and operations where rapid assembly is important.

Abstract: The present invention relates to a thermoplastic resin composition comprising a thermoplastic resin and hollow carbon fibrils dispersed in the thermoplastic resin, the hollow carbon fibrils being present in an amount of 0.1 to 20% by weight based on the total weight of the composition, comprising independent fibrils and agglomerated fibrils, and having such a dispersing condition, when represented by indices based on the measurement of transmission electron microphotograph, that the ratio of the independent fibrils to the agglomerated fibrils lies within the range of 8/92 to 40/60 and the independent fibrils have an average length of 20 to 200 nm.

Abstract: The present invention provides an aqueous dispersion containing at least two powder types selected from one or more metal oxide powders and/or one or more non-metal oxide powder. The present invention also provides a coating composition containing this dispersion, an inkjet recording medium containing the coating composition, and methods of making the same.

Abstract: A polymeric material containing a halogen-containing polymer such as PVC, an inorganic hydroxide and, an acrylic material is described. The presence of the inorganic hydroxide provides a material of superior weathering resistance as compared to materials comprising halogen-containing polymers which do not contain hydroxide.

Abstract: It is the object of the present invention to provide a curable composition capable of giving a polymer electrolyte showing a high level of ionic conductivity and excellent mechanical strength as well. The invention provides a curable composition for polymer electrolyte which comprises the following constituents (A) to (D) as essential constituents: (A) a polysiloxane having a polyethylene oxide structure-containing group and/or a cyclic carbonate structure-containing group as a substituent on a silicon atom and having two or more SiH groups; (B) a compound having at least one structure selected from the group consisting of a phenylene unit, a siloxy linkage, an Si—N bond, a carbonyl group, an amide linkage and an amino group and having two or more alkenyl groups; (C) a hydrosilylation catalyst; and (D) an electrolyte salt compound.

Abstract: An object of the present invention is to provide a discoloration inhibitor for metals, for protecting metal artifacts, such as those made of silver, copper, and nickel, or their alloys, from discoloration due to sulfur-containing gases such as sulfur oxide (SOx), mercaptans, and hydrogen sulfide, for example, during display or storage of the metal artifacts. A discoloration inhibitor for metals comprising: a fiber having a crosslinking structure and containing carboxyl groups therein, at least part of said carboxyl groups being present as a salt of an alkali metal, an alkali earth metal or ammonia; and fine particles of a metal and/or a metal compound substantially insoluble in water and reactive with a sulfur-containing compound dispersed in said fiber is disclosed.

Abstract: About 0.001 to 5 parts by weight of a hindered phenol-series compound, about 0.01 to 5 parts by weight of a weather (light)-resistant stabilizer, and about 0.001 to 10 parts by weight of a spiro-compound having a triazine ring are added to 100 parts by weight of a polyacetal resin. The spiro-compound may be a compound represented by the following formula (1). The polyacetal resin composition may further comprise a coloring agent, a processing stabilizer, a heat stabilizer, and others. wherein R1 and R2 are the same or different, each representing an alkylene group, an arylene group, or an aralkylene group.

Abstract: A polymer composition formed by: I) fluoropolymers selected from one or more of the following: copolymers based on ethylene, TFE and/or CTFE modified with hydrogenated monomers, or blends of these fluoropolymers with PCTFE; said fluoropolymers and/or the corresponding blends optionally mixed with hydrogenated plasticizers; II) one or more inorganic fire-retardants, treated and not with dispersing agents; III) one or more crosslinking agents; IV) optional additives.

Abstract: A polyolefin composition substantially free of elastomers (plasticizers), preferably crystalline polypropylene, modified by mixing with polybutene-1 and containing an exfoliated inorganic nanocomposite and a coupling agent is described. The composition is adapted to be used with pigments to make finished molded products which have an appearance of paint covered by a clear coat and which are scratch resistant and have good low temperature (−30° C.) impact properties.

Abstract: An olefin-type flame-retardant resin composition having excellent mechanical strength, abrasion resistance and workability, and exhibiting excellent flame-retardant properties and shell-forming properties when it has burned, despite the resin composition is blended with an inorganic compound. The composition contains 25 to 250 parts by weight of (D) a flame-retardant inorganic compound per 100 parts by weight of a base resin composition containing 95 to 5% by weight of (A) a copolymer of an ethylene and a vinyl acetate or other polar group-containing monomer, (B) 5 to 95% by weight of a copolymer of an olefin and an unsaturated carboxylic acid ester or other polar group-containing monomer, and 0 to 49% by weight of (C) a thermoplastic resin other than the above copolymers.

Abstract: According to an aspect of the invention, a polymerized form of formaldehyde is available in granular form containing a polymerized form of formaldehyde, such as paraformaldehyde, a buffer, such as sodium phosphate dibasic anhydrous, and a stabilizer, such as hydroxymethyl cellulose, or hydroxypropyl methyl cellulose. When added to an aqueous solvent, the paraformaldehyde can dissolve in alkaline solution, and depolymerizes into a formaldehyde solution containing a stabilizer. Optionally a second member of the buffer pair or another buffer or pH adjuster can be used The stabilized depolymerized formaldehyde solution is then ready for use, or can be modified by addition of other substances, such as sodium phosphate monobasic monohydrate. Additionally, an additional buffer may be included in the granular mixture to increase the rate at which the solid dissolves and depolymerizes.

Abstract: A water borne binder composition comprising (a) an aqueous dispersion of an acrylic copolymer comprising carboxylic acid and ethylene-urea functionality, having a weight average molecular weight below 200,000 and a Tg<−15° C., as calculated from the monomer composition using the Fox equation; and (b) a water soluble complex of a transition metal, preferably zinc.

Abstract: A coagulant which is the reaction product of a trivalent metal salt, excluding chromium salts, an acid phosphorous compound and an aluminum hydroxy chloride, and a process for preparing such coagulant. This coagulant may be effectively used to remove suspended solids and various impurities in most water treatment applications.

Abstract: The present invention relates to graft copolymers, useful as dispersants in ink jet ink compositions, which comprise two structurally distinct segments: a hydrophilic segment and a hydrophobic segment. The preferred hydrophilic segment is comprised preferably of a methacrylic acid polymer, or a copolymer thereof with another monomer, such as styrene sulfonic acid. The preferred hydrophobic segment comprises a polymer or copolymer containing electron rich functional groups comprised of a plurality of methacrylate derivatized monomers, preferably a methacrylate ester monomer, or a substituted methacrylate ester monomer (a methacrylate ester where the alkyl group is replaced with a siloxyl substituent, an oligomeric siloxane). The present invention also relates to aqueous ink compositions which include the polymeric dispersants of the present invention. A further embodiment of the present invention comprises a polymer comprising a monomeric hydrophobic head and a polymeric tail.

Abstract: The object of the present invention is to provide an aromatic polyester amide which has improved mechanical strength and high elastic modulus after being molded into a thin wall article as well as exhibits excellent heat stability and moldability. The present invention provides an aromatic polyester amide comprising the following repeating units (a)-(d): [wherein n in (c) represents 0 or 1] wherein (a) is from 2 to 20 mole %, (b) is from 30 to 65 mole %, (c) is from 15 to 35 mole % and (d) is from 15 to 30 mole % provided that the sum of (a) to (d) is 100 mole %.

Abstract: An epoxy resin composition, which comprises, as an essential component, a phosphorus compound having an average of not less than 1.8 and less than 3 of phenolic hydroxy groups reactive with an epoxy resin and an average of not less than 0.8 of a phosphorus element in the molecule, an inorganic filler having an average particle diameter of not greater than 30 &mgr;m, a bifunctional epoxy resin having an average of not less than 1.8 and less than 2.6 of epoxy groups in the molecule and a hardener, wherein the bifunctional epoxy resin is contained at an amount of not less than 51% by mass relative to the whole epoxy resin, at least one of dicyandiamide and a polyfunctional phenol system compound having an average of not less than 3 of phenolic hydroxy groups in the molecule is used as the hardener and a ratio (a/c) of equivalent (a) of a phenolic hydroxy group of the phosphorus compound and equivalent (c) of an epoxy group of the bifunctional epoxy resin is not less than 0.3 and less than 0.

Abstract: The invention relates to new methods of dyeing polymers. The methods include dispersing nanomaterials into the polymers to form polymer nanocomposites, and dyeing the polymer nanocomposites with a dye. The invention also relates to dyed polymers thus obtained and articles made from these dyed polymers.

Abstract: A mixture Ia comprises a mix IIa composed of a) from 1 to 95% by weight of a solid III, preferably a basic solid III, with a primary particle size of from 5 nm to 20 &mgr;m and b) from 5 to 99% by weight of a polymeric composition IV, obtainable by polymerizing b1) from 5 to 100% by weight, based on the composition IV, of a condensation product V of &agr;) at least one compound VI which is capable of reacting with a carboxylic acid or with a sulfonic acid or with a derivative or a iixture of two or more of these, and &bgr;) at least 1 mol per mole of the compound VI of a carboxylic acid or sulfonic acid VII which has at least one functional group capable of free-radical polymerization, or of a derivative thereof or of a mixture of two or more thereof and b2) from 0 to 95% by weight, based on the composition IV, of another compound VIII with an average molecular weight (number average) of at least 5000 having polyether segments in its main or side chain and at least one ester of the formula (E1) to (E5)

Abstract: Disclosed is a rubber composition containing (a) 50 parts to 100 parts by weight of polybutadiene rubber having a 1,4-cis bond content of 80 mol % to 100 mol % and a 1,2-vinyl bond content of 0 mol % to 2 mol %, which is modified with an alkoxysilyl group-containing compound, (b) 0 part to 50 parts by weight of diene rubber other than the above-mentioned component (a) (wherein the total amount of component (a) and component (b) is 100 parts by weight), (c) 10 parts to 50 parts by weight of a crosslinkable monomer, (d) 5 parts to 80 parts by weight of an inorganic filler and (e) 0.1 part to 10 parts by weight of an organic peroxide, and a solid golf ball improved in flight, durability and the feeling of ball hitting can be produced from the rubber composition.

Abstract: A method of producing an aliphatic polyester, including polycondensing an aliphatic diol and an aliphatic dicarboxylic acid compound, or a prepolymer thereof in the presence of a metal-containing ester interchange catalyst and a phosphorus-containing co-catalyst such as an ammonium, calcium or magnesium salt of hydrogen-containing phosphoric acid or an organic phosphinic acid. An oxycarboxylic acid compound or its prepolymer may also be used as a raw material.

Abstract: A stable, aqueous composition containing a substantially crosslinked alkali-swellable acrylate copolymer rheology modifier, a surfactant, an alkaline material, and various compounds therein, as for example substantially insoluble materials requiring suspension or stabilization, such as a silicone, an oily material, or a pearlescent material. Additionally, this invention also relates to the formation of a rheologically and phase stable cationic hair dye composition. The invention further relates to the incorporation of an acidic material after the addition of an alkaline material to reduce the pH of the composition without negatively impacting the viscosity of the composition.

Abstract: A stable modified metal oxide sol which contains from 2 to 50 wt %, as calculated as metal oxides, of particles (c) comprising colloidal particles (a) of a metal oxide having primary particle diameters of from 2 to 60 nm, as nuclei, and a coating material (b) consisting of colloidal particles of an acidic oxide coated on the surface of the particles (a), and which has primary particle diameters of from 2 to 100 nm.

Abstract: A carbon monoxide modified ethylene-vinyl acetate copolymer composition is disclosed, having diminished tendency to cause discoloration on heating at 177° C. of a plastic composition whose major polymeric component is polyvinyl chloride, comprising carbon monoxide modified ethylene-vinyl acetate copolymer and an amount, effective in diminishing discoloration, of at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates.

Abstract: An aluminum hydroxide composition is disclosed, having diminished tendency to cause discoloration on heating at 177° C. of a plastic composition whose major polymeric component is polyvinyl chloride, comprising aluminum hydroxide and an amount, effective in diminishing discoloration, of at least one inorganic perchlorate salt selected from the group consisting of alkali metal perchlorates and alkaline earth metal perchlorates.

Abstract: (Co)poly-&agr;-hydroxyacrylic-acid-based polymers (P), optionally in lactonized form or in salt form, optionally as Mg-complexes, and which are characterized by a content in carbohydrate units and 2-hydroxy-2-carboxyethylene-1,2 monomer units, are suitable as biologically degradable, alkali-resistant stabilizers for peroxide bleaching agents.

Abstract: A pressure sensitive adhesive/cohesive exhibits excellent cohesive body properties, and other desirable features, even when exposed to heat and polysiloxane based lubricants, such as in a laser printer. The formulation comprises 100 parts by weight natural rubber (e.g. electrosterically stabilized natural rubber graft and block terpolymer), and expressed as percentages by weight of the rubber the following components: about 5-35% (e.g. about 28%) acrylate monomer or monomers (such as methyl methacrylate, cyclohexyl methacrylate, benzyl methacrylate, and/or isobornyl methacrylate); about 0.5-8% acrylic acid and/or about 1-10% 4-acetoxystyrene; about 0-20% ethyl hexyl acrylate; about 1-50% (e.g.

Abstract: Inorganic particle/polymer composites are described that involve chemical bonding between the elements of the composite. In some embodiments, the composite composition includes a polymer having side groups chemically bonded to inorganic particles. Furthermore, the composite composition can include chemically bonded inorganic particles and ordered copolymers. Various electrical, optical and electro-optical devices can be formed from the composites.

Abstract: An electronic package includes a heat-generating electronic component such as an integrated circuit chip, a thermally conductive member, which may be an integrated heat spreader, and a low modulus thermal interface material in heat conducting relation between the electronic component and the thermally conductive member. Increased thermal performance requirements at the electronic component level are met by the thermal interface material, which includes a polymer matrix and thermally conductive filler, which has a storage shear modulus (G′) at 125° C. of less than about 100 kPa, and which has a gel point, as indicated by a value of G′/G″ of ≧1, where G″ is the loss shear modulus of the thermal interface material. The values for G′ and G″ are measured by a strain-controlled rheometer.

Abstract: A glittering paint, not requiring formation of primer layer and/or clear top coat layer includes a coated film forming polymer, a glittering pigment comprising inorganic powder and a solvent, wherein the coated film forming polymer comprising a pigment carrying polymer, wherein the pigment carrying polymer has a weight average molecular weight (Mw) of at least 50,000 and a refractive index nD of at least 1.48 as measured by an Abbe refractometer, the coated film forming polymer has an entire weight average molecular weight (Mw) of at least 50,000, the inorganic powder has an aspect ration of particle length or diameter to particle thickness of at least 50, and the glittering pigment content (PWC) in the coated film is 15 wt % or less.

Abstract: The invention concerns a coating composition, in particular a paint comprising (A) 3 to 30 parts of a latex consisting of organic (co)polymers having a glass transition temperature ranging between −20° C. and 50° C.; (B) 0.05 to 5 parts of an epoxyfunctionalized polyorganosiloxane emulsion; (C) and 100 parts of mineral fillers.

Abstract: The present invention provides an tonically conductive composition comprising a linear copolymer of a compound (A) having two functional groups (a) and a compound (B) having two functional groups (b) and an electrolyte; as well as a battery containing it. Preferably, a polymer having a network structure obtained by reacting the linear copolymer having functional group (b) at each end with a compound having three or more functional groups (a) is used in the ionically conductive composition of the present invention.

Abstract: The present invention concerns polymers obtained by anionic initiation and bearing functions that can be activated by cationic initiations that are not reactive in the presence of anionic polymerization initiators. The presence of such cationic initiation functions allow an efficient cross-linking of the polymer after moulding, particularly in the form of a thin film. It is thus possible to obtain polymers with well-defined properties in terms of molecular weight and cross-linking density. The polymers of the present invention are capable of dissolving ionic compounds inducing a conductivity for the preparation of solid electrolytes.

Abstract: A malleable high density polymer material having a high density metal component and a polymer phase consisting of a rigid or hard component, and an elastomeric modifier for the hard component, and where the elastomeric component is chosen from one of several narrow molecular weight distribution ethylene/alpha-olefin elastomers. One advantage of the present invention is to achieve a surprisingly malleable, high density material that has unusual melt properties which may be used as a lead substitute in the making of for example, projectiles, shot, or angling weights. Another advantage of the present invention is to provide a lead substitute that is non-toxic.

Abstract: Reagents to cause swelling of coarsely ground vulcanized rubber, and a method of using the reagents is disclosed. Reagents which cause rubber to swell but which do not attack or react with rubber include various hydrocarbons, ketones and lactones. Specifically useful are benzene, cyclohexanone, cyclohexane, toluene, xylene, hexane, heptane, acetone, gasoline, paramethadione, ethyl acetate, methyl ethyl ketone and amyl acetate. It is taught that specific reagents work most effectively with specific types of rubbers, and that mixtures of reagents, preferably reagents having the same polarity, may be used. The reagent of the present invention is mixed with the coarsely ground rubber powder for about five minutes or more, causing the rubber particles to approximately double in size. Preferably, the reagent is substantially fully absorbed by the rubber. The swollen rubber is then suitable for further processing, namely, grinding into a superfine powder.

Abstract: A calcium hydroxide-based root canal filling material having superior bioaffinity is provided, which is a temporary root canal filling material to be used in the root canal treatment of teeth, having such roles that, when filled temporarily in the root canal, it stays in an affected part during a predetermined period of time, thereby a root canal being prevented from staining by pathogenic bacteria or exudates, has corrosion resistance, and promotes the remedy of an apical abscess by wound of the root apex portion. The calcium hydroxide-based root canal filling material is comprised of 3 to 20% by weight of polyvinylpyrrolidone and/or polyvinyl methyl ether, 30 to 60% by weight of calcium hydroxide, and 35 to 60% by weight of water. Further, there is an embodiment in which from 5 to 20 parts by weight of at least one X-ray opacity medium selected from barium sulfate, zirconium oxide, bismuth subnitrate, bismuth trioxide, and bismuth carbonate and/or 0.

Abstract: An adsorbent to an aromatic hydroxy compound, which comprises composite metal oxide solid solution particles of the following formula (1) or hydrotalcite-like composite metal hydroxide particles of the following formula (2), and a method of removing an aromatic hydroxy compound in a solvent by using the adsorbent. (Mgy1M2+y2)1−xAlxO1+0.5x  (1) (Mgy1M2+y2)1−zAlz(OH)2+a(An−)b.mH2O  (2) Provided according to the present invention is an adsorbent capable of efficiently removing an aromatic hydroxy compound from an aqueous solvent or an organic solvent containing an aromatic hydroxy compound.

Abstract: Provided is a dye composition for keratinous fibers, which comprises (A) a hydrolyzate of a lower alkyl vinyl ether/maleic anhydride copolymer partially crosslinked with a terminal unsaturated diene compound, or a monoalkyl ester of the hydrolyzate; and (B) a dye. The dye composition for keratinous fibers according to the present invention has a stable and appropriate viscosity even in a wide pH range and even in a system containing a salt or solvent at a high concentration; and has excellent usability and dyeing properties. It is particularly suited for use with an acid dye.

Abstract: A polyamide composition comprising 100 parts by weight of (A) a semiaromatic polyamide having dicarboxylic acid units mainly composed of aromatic dicarboxylic acid units and diamine units mainly composed of aliphatic diamine units having 4 to 14 carbon atoms and containing not more than 15 &mgr;eq/g of terminal amino groups; and 0.01 to 5 parts by weight of (B) a copper compound.

Abstract: Herein is disclosed an oxygen barrier composition comprising ethylene/vinyl alcohol copolymer (EVOH), an oxygen scavenging polymer, and a transition metal salt. The composition can be in the form of a physical blend or a cross-linked blend, and can further comprise a compatibilizer, a transesterification catalyst, or both. Also disclosed is a packaging article comprising at least one high oxygen barrier layer comprising the blend of EVOH, the oxygen scavenging polymer, and the transition metal salt. The packaging article can be a single-layer or a multilayer article, and can be flexible or rigid. A multilayer packaging article can further comprise a structural layer or layers, an oxygen barrier layer, an oxygen scavenging layer, an oxygen permeable layer or layers, or an adhesive layer or layers, among others. In addition, herein is disclosed a method of making the blend of EVOH, the oxygen scavenging polymer, and the transition metal salt, comprising providing and blending the materials.

Abstract: A composition comprising a high temperature partially aromatic polyamide, an impact modifier, a secondary aryl amine, and a copper stabilizer.

Abstract: Disclosed is a method for preparing saturated polyester used in various molded products, such as films, synthetic fibers, vessels and housings. In particular, the method improves mechanical properties, including tensile strength or impact resistance, of saturated polyester. In DMT method or TPA method, the saturated polyester is synthesized through transesterification or esterification and polycondensation, in which metal compounds, such as metal acetate compounds, metal hydroxides, and metal oxides, are added in the larger amounts upon synthesis, and thus crystalline internal grains are formed, thereby improving the mechanical properties. As such, the metal compound can be used alone or in combination with a phosphorous-based compound.

Abstract: A paste composition having a high thermal conductivity and a relatively low viscosity is used to provide a thermal conductive connection between an electronic component and a cooling device to increase the heat transfer rate between the component and the device cooling the electronic component. The paste composition comprises a non-aqueous dielectric carrier, thermally conductive filler particles and a specially defined dispersant comprising the self-condensation reaction product of a hydroxy fatty acid, the reaction product having an acid number of about 30-100. A 12-hydroxy stearic acid self condensed reaction product is the preferred dispersant.

Abstract: A kneading status evaluation method for a rubber composition containing at least a rubber and a filler comprises the steps of a complex modulus measurement step (1) in which a complex modulus E*(a) at a given strain &egr; a and a complex modulus E*(b) at a given strain &egr; b differing from the strain &egr; a of the rubber composition (I) are measured, a filler dispersion index calculation step (2) in which a filler dispersion index (N) of the rubber composition (I) is calculated with complex elastic moduli E*(a) and E*(b) obtained in the previous step (1) according to the equation shown below, and a comparison step (3) to compare a predetermined target filler dispersion index (R) with the filler dispersion index (N) calculated in the previous step (2), and/or a complex viscosity coefficient measurement step (5) to measure a complex viscosity coefficient &eegr;* of the rubber composition (I) under at least two different temperatures, and a kneading status monitor index calculation step (6) to calculate a kne