The present invention provides a modified liquid diene rubber that is capable of giving a crosslinked product with excellent adhesion evaluated in terms of shear bond strength, a rubber composition including the modified liquid diene rubber, and a sealing material obtained from the rubber composition. A modified liquid diene rubber (A) has a functional group (a) derived from an acid anhydride, and contains butadiene units in an amount of 50 mass % or more based on the total monomer units, and the polystyrene-equivalent weight average molecular weight (Mw) measured by gel permeation chromatography (GPC) is in the range of 5,000 to 50,000.

A method of producing a powder mass for a lithium battery, the method comprising: (a) providing a solution containing a sulfonated elastomer dissolved in a solvent or a precursor in a liquid form or dissolved in a solvent; (b) dispersing a plurality of particles of a cathode active material in the solution to form a slurry; and (c) dispensing the slurry and removing the solvent and/or polymerizing/curing the precursor to form the powder mass, wherein the powder mass comprises multiple particulates and at least a particulate comprises one or a plurality of particles of a cathode active material being encapsulated by a thin layer of sulfonated elastomer having a thickness from 1 nm to 10 μm, a fully recoverable tensile strain from 2% to 800%, and a lithium ion conductivity from 10.sup.−7 S/cm to 5×10.sup.−2 S/cm at room temperature.

Provided are a terminally modified diene-based polymer having excellent mechanical properties and also a method for producing the same. The terminally modified diene-based polymer is obtainable by allowing a diene-based polymer terminated with ketone or aldehyde groups to react with an aminophosphonic acid compound represented by general formula (1) or (2): ##STR00001##
wherein in formulas (1) and (2), R.sub.1 and R.sub.4 each represent a C.sub.1-10 alkanediyl group, R.sub.2 and R.sub.3 may be the same or different and each represent hydrogen, a C.sub.1-3 alkyl group, or a phenyl group, R.sub.5, R.sub.6, R.sub.8, and R.sub.9 may be the same or different and each represent hydrogen, a C.sub.1-3 alkyl group, or a phenyl group, and R.sub.7 represents hydrogen or a hydroxyl group.

Provided are a terminally modified diene-based polymer having excellent mechanical properties and also a method for producing the same. The terminally modified diene-based polymer is obtainable by allowing a diene-based polymer terminated with ketone or aldehyde groups to react with an aminophosphonic acid compound represented by general formula (1) or (2): ##STR00001##
wherein in formulas (1) and (2), R.sub.1 and R.sub.4 each represent a C.sub.1-10 alkanediyl group, R.sub.2 and R.sub.3 may be the same or different and each represent hydrogen, a C.sub.1-3 alkyl group, or a phenyl group, R.sub.5, R.sub.6, R.sub.8, and R.sub.9 may be the same or different and each represent hydrogen, a C.sub.1-3 alkyl group, or a phenyl group, and R.sub.7 represents hydrogen or a hydroxyl group.

A method of producing a powder mass for a lithium battery, the method comprising: (a) providing a solution containing a sulfonated elastomer dissolved in a solvent or a precursor in a liquid form or dissolved in a solvent; (b) dispersing a plurality of particles of a cathode active material in the solution to form a slurry; and (c) dispensing the slurry and removing the solvent and/or polymerizing/curing the precursor to form the powder mass, wherein the powder mass comprises multiple particulates and at least a particulate comprises one or a plurality of particles of a cathode active material being encapsulated by a thin layer of sulfonated elastomer having a thickness from 1 nm to 10 μm, a fully recoverable tensile strain from 2% to 800%, and a lithium ion conductivity from 10.sup.−7 S/cm to 5×10.sup.−2 S/cm at room temperature.

A method of producing a carboxyl group-containing nitrile rubber including a coagulation step of coagulating a carboxyl group-containing nitrile rubber component by mixing a monovalent metal salt and a polymer flocculating agent into a carboxyl group-containing nitrile rubber latex having an iodine value of 120 or less, wherein the monovalent metal salt is compounded in an amount of 3 to 25 parts by weight and the polymer flocculating agent is compounded in an amount of 0.01 to 10 parts by weight relative to 100 parts by weight of a rubber solid content in the latex, and a weight ratio of the monovalent metal salt/the polymer flocculating agent is in the range of 10 to 500

A method of producing a carboxyl group-containing nitrile rubber including a coagulation step of coagulating a carboxyl group-containing nitrile rubber component by mixing a monovalent metal salt and a polymer flocculating agent into a carboxyl group-containing nitrile rubber latex having an iodine value of 120 or less, wherein the monovalent metal salt is compounded in an amount of 3 to 25 parts by weight and the polymer flocculating agent is compounded in an amount of 0.01 to 10 parts by weight relative to 100 parts by weight of a rubber solid content in the latex, and a weight ratio of the monovalent metal salt/the polymer flocculating agent is in the range of 10 to 500

The present invention relates to a process for preparing hydroxy-functionalized polydiene, preferably polybutadiene or polyisoprene, by reacting monomer diene with hydrogen peroxide in the presence of a hydrophilic organic solvent, wherein the total amount of monomer diene used is added to the reaction in at least two parts, wherein the second part of the monomer diene is added to the reaction at a temperature of the reaction mixture that is at least +5 K different from the temperature of the reaction mixture at the addition of the first part of the monomer diene, to hydroxy-functionalized polybutadiene, having a dispersity index D below 2.7, a viscosity at 30° C. below 3200 mPa*s, an OH-number of from 50 to 90, a number average molecular weight Mn of from 1.6 to 2.5 kDa, and a weight number average molecular weight Mw of from 4.0 to 5.6 kDa, and comprising the monomer units derived from 1,3-butadiene in a specific ratio, and use of the hydroxy-functionalized polybutadiene, for the production of polyurethane-based thermo-or electro-insulation, adhesives or sealants or polyesters.

The present invention relates to a process for preparing hydroxy-functionalized polydiene, preferably polybutadiene or polyisoprene, by reacting monomer diene with hydrogen peroxide in the presence of a hydrophilic organic solvent, wherein the total amount of monomer diene used is added to the reaction in at least two parts, wherein the second part of the monomer diene is added to the reaction at a temperature of the reaction mixture that is at least +5 K different from the temperature of the reaction mixture at the addition of the first part of the monomer diene, to hydroxy-functionalized polybutadiene, having a dispersity index D below 2.7, a viscosity at 30° C. below 3200 mPa*s, an OH-number of from 50 to 90, a number average molecular weight Mn of from 1.6 to 2.5 kDa, and a weight number average molecular weight Mw of from 4.0 to 5.6 kDa, and comprising the monomer units derived from 1,3-butadiene in a specific ratio, and use of the hydroxy-functionalized polybutadiene, for the production of polyurethane-based thermo-or electro-insulation, adhesives or sealants or polyesters.

The present invention concerns new precursors of recyclable cross-linked diene elastomers comprising at least one furanyl group along the chain and comprising chain-end units with furanyl groups, their use in the preparation of said recyclable elastomers and their process of preparation. The invention also concerns new recyclable cross-linked diene elastomers, their preparation process and their uses.