Disclosed is a method of preparing a carboxylic acid modified-nitrile based copolymer latex including: initiating emulsion polymerization of a monomer mixture including a conjugated diene-based monomer, ethylenic unsaturated nitrile-based monomer, ethylenic unsaturated acid monomer, and water-soluble monomer in the presence of water and 0.01 to 0.1 parts by weight of a lipid-soluble initiator based on 100 parts by weight of total of monomer mixture, and at a weight ratio (M/W) of the monomer mixture to water of 1.1 to 1.4 (S10); adding water when the polymerization conversion rate is 30 to 40% at a weight ratio (M/W) of 0.8 to 1.0 (S20); and adding water when the polymerization conversion rate is 60 to 70% at a weight ratio (M/W) of 0.6 to 0.7 (S30), when the polymerization conversion rate is between ≥10% and <60%, 0.1 to 2.0 parts by weight of sodium naphthalene sulfonate formaldehyde condensate based on 100 parts by weight of the total monomer mixture is introduced.

Disclosed is a method of preparing a carboxylic acid modified-nitrile based copolymer latex including: initiating emulsion polymerization of a monomer mixture including a conjugated diene-based monomer, ethylenic unsaturated nitrile-based monomer, ethylenic unsaturated acid monomer, and water-soluble monomer in the presence of water and 0.01 to 0.1 parts by weight of a lipid-soluble initiator based on 100 parts by weight of total of monomer mixture, and at a weight ratio (M/W) of the monomer mixture to water of 1.1 to 1.4 (S10); adding water when the polymerization conversion rate is 30 to 40% at a weight ratio (M/W) of 0.8 to 1.0 (S20); and adding water when the polymerization conversion rate is 60 to 70% at a weight ratio (M/W) of 0.6 to 0.7 (S30), when the polymerization conversion rate is between ≥10% and <60%, 0.1 to 2.0 parts by weight of sodium naphthalene sulfonate formaldehyde condensate based on 100 parts by weight of the total monomer mixture is introduced.

The present disclosure provides a low density polyethylene (LDPE) having (A) a density from 0.910 to 0.924 g/cm.sup.3, determined according to ISO 1183 at 23° C.; (B) an elongational hardening of at least 4.2, at 150° C. at an elongational rate of 1 s.sup.−1; (C) a ratio Mw/Mn of at least 18, where (i) Mw is the weight average molar mass, measured by a MALLS detector coupled to a GPC, and (ii) Mn is the number average molar mass, measured by GPC (Gel Permeation Chromatography); and (D) a Mw of at least 230,000 g/mol. The present disclosure also provides an article of manufacture made from or containing (A) a substrate and (B) a coating layer made from or containing the disclosed LDPE. The present disclosure further provides a polymerization process occurring (A) in the presence of oxygen as the only radical initiating agent and (B) in the absence of solvents.

The present disclosure provides a low density polyethylene (LDPE) having (A) a density from 0.910 to 0.924 g/cm.sup.3, determined according to ISO 1183 at 23° C.; (B) an elongational hardening of at least 4.2, at 150° C. at an elongational rate of 1 s.sup.−1; (C) a ratio Mw/Mn of at least 18, where (i) Mw is the weight average molar mass, measured by a MALLS detector coupled to a GPC, and (ii) Mn is the number average molar mass, measured by GPC (Gel Permeation Chromatography); and (D) a Mw of at least 230,000 g/mol. The present disclosure also provides an article of manufacture made from or containing (A) a substrate and (B) a coating layer made from or containing the disclosed LDPE. The present disclosure further provides a polymerization process occurring (A) in the presence of oxygen as the only radical initiating agent and (B) in the absence of solvents.

One embodiment of the present invention relates to a chloroprene copolymer latex, a method for producing a chloroprene copolymer latex, a chloroprene copolymer latex composition, and a molded article or dipped product of a chloroprene copolymer rubber. The chloroprene copolymer latex is a latex of a chloroprene copolymer including monomer units derived from 2-chloro-1,3-butadiene (chloroprene) and monomer units derived from 2-methyl-1,3-butadiene, wherein the tetrahydrofuran insoluble content in the chloroprene copolymer is 20% by mass or less, and the proportion of the monomer units derived from 2-methyl-1,3-butadiene is 10 to 27 mol % in the chloroprene copolymer.

One embodiment of the present invention relates to a chloroprene copolymer latex, a method for producing a chloroprene copolymer latex, a chloroprene copolymer latex composition, and a molded article or dipped product of a chloroprene copolymer rubber. The chloroprene copolymer latex is a latex of a chloroprene copolymer including monomer units derived from 2-chloro-1,3-butadiene (chloroprene) and monomer units derived from 2-methyl-1,3-butadiene, wherein the tetrahydrofuran insoluble content in the chloroprene copolymer is 20% by mass or less, and the proportion of the monomer units derived from 2-methyl-1,3-butadiene is 10 to 27 mol % in the chloroprene copolymer.

The present disclosure relates to an electrode binder composition for a rechargeable battery and an electrode mixture comprising the same. The electrode binder composition for a rechargeable battery of the present disclosure not only has excellent properties in terms of binding strength, mechanical properties, and the like, but also can maintain structural stability of an electrode even after repeated charge/discharge cycles, thus improving rechargeable battery performances.

The present disclosure relates to an electrode binder composition for a rechargeable battery and an electrode mixture comprising the same. The electrode binder composition for a rechargeable battery of the present disclosure not only has excellent properties in terms of binding strength, mechanical properties, and the like, but also can maintain structural stability of an electrode even after repeated charge/discharge cycles, thus improving rechargeable battery performances.

Provided is a method of preparing a diene-based rubber polymer, which includes: adding each of a diene-based monomer, a molecular-weight regulator, an initiator, and an emulsifier to a reactor a first time and carrying out polymerization; adding a molecular-weight regulator to the reactor a second time when a polymerization conversion rate of 48 to 72% is reached and carrying out polymerization; adding a diene-based monomer to the reactor a second time when a polymerization conversion rate of 63 to 77% is reached and carrying out polymerization; adding each of an initiator and an emulsifier to the reactor a second time when a polymerization conversion rate of 68 to 81% is reached and carrying out polymerization; and adding each of an initiator and an emulsifier to the reactor a third time when a polymerization conversion rate of 85 to 91% is reached and carrying out polymerization.

Provided is a method of preparing a diene-based rubber polymer, which includes: adding each of a diene-based monomer, a molecular-weight regulator, an initiator, and an emulsifier to a reactor a first time and carrying out polymerization; adding a molecular-weight regulator to the reactor a second time when a polymerization conversion rate of 48 to 72% is reached and carrying out polymerization; adding a diene-based monomer to the reactor a second time when a polymerization conversion rate of 63 to 77% is reached and carrying out polymerization; adding each of an initiator and an emulsifier to the reactor a second time when a polymerization conversion rate of 68 to 81% is reached and carrying out polymerization; and adding each of an initiator and an emulsifier to the reactor a third time when a polymerization conversion rate of 85 to 91% is reached and carrying out polymerization.