A first object of the present invention is to provide a stretchable conductor sheet that exhibits isotropic conductivity when stretched in a predetermined direction or in a direction perpendicular to the predetermined direction, and a paste for forming a stretchable conductor sheet, which is used for the stretchable conductor sheet. A second object of the present invention is to provide a stretchable conductor sheet having a small change in specific resistance even when repeatedly twisted, and a paste for forming a stretchable conductor sheet, which is used for the stretchable conductor sheet. A third object of the present invention is to provide a stretchable conductor sheet having a small change in specific resistance even when repeatedly washed, and a paste for forming a stretchable conductor sheet, which is used for the stretchable conductor sheet. The first object of the present invention can accomplish a stretchable conductor sheet having a thickness of 3 to 800 μm, the stretchable conductor sheet comprising at least conductive particles, inorganic particles surface-treated with a hydroxide and/or an oxide of one or both of Al and Si, and a flexible resin having a tensile elastic modulus of 1 MPa or more and 1000 MPa or less, wherein in each of two orthogonal directions, a specific resistance change ratio of the sheet at a time of elongation by 40% with respect to an original length is less than ±10% in an elongation direction.

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.

This application relates to synthetic elastomeric articles, and gloves in particular, comprising the cured product of a synthetic latex composition, the synthetic latex composition comprising a synthetic carboxylated polymer and a cross-linking composition, the cross-linking composition comprising an aqueous solution of a negatively charged multivalent metal complex ion having a pH of at least 9.0. Also described are compositions for forming the articles, and methods for making the articles, based on the use of the described cross-linking composition. The articles so produced have an average thickness of 0.2 mm or less and a modulus at 500% of less than 6.5 MPa.

This application relates to synthetic elastomeric articles, and gloves in particular, comprising the cured product of a synthetic latex composition, the synthetic latex composition comprising a synthetic carboxylated polymer and a cross-linking composition, the cross-linking composition comprising an aqueous solution of a negatively charged multivalent metal complex ion having a pH of at least 9.0. Also described are compositions for forming the articles, and methods for making the articles, based on the use of the described cross-linking composition. The articles so produced have an average thickness of 0.2 mm or less and a modulus at 500% of less than 6.5 MPa.

What are provided are colour-stable, low-salt nitrile rubbers and a process for production thereof under specific conditions for the coagulation and/or washing of the nitrile rubber. Additionally obtainable are the corresponding vulcanizable mixtures based on this nitrile rubber, a process for producing vulcanizates from these mixtures and the resultant vulcanizates having excellent processing properties.

What are provided are colour-stable, low-salt nitrile rubbers and a process for production thereof under specific conditions for the coagulation and/or washing of the nitrile rubber. Additionally obtainable are the corresponding vulcanizable mixtures based on this nitrile rubber, a process for producing vulcanizates from these mixtures and the resultant vulcanizates having excellent processing properties.

Disclosed is a latex composition for dip molding comprising a carboxylic acid-modified nitrile copolymer latex and starch and an article produced therefrom. Advantageously, a dip-molded article having low syneresis, less stickiness and superior tensile strength can be obtained by using the carboxylic acid-modified nitrile latex in conjunction with starch.

Disclosed is a latex composition for dip molding comprising a carboxylic acid-modified nitrile copolymer latex and starch and an article produced therefrom. Advantageously, a dip-molded article having low syneresis, less stickiness and superior tensile strength can be obtained by using the carboxylic acid-modified nitrile latex in conjunction with starch.

A method for producing a rubber composition include a mixing step, a drying step, and a dispersion step. In the mixing step, an aqueous solution that includes at least one of oxycellulose fibers and cellulose nanofibers is mixed with rubber latex to obtain a first mixture. In the drying step, the first mixture is dried to obtain a second mixture. In the dispersion step, the second mixture is tight-milled using an open roll to obtain a rubber composition. The rubber composition does not include an aggregate that includes at least one of the oxycellulose fibers and the cellulose nanofibers, and has a diameter of 0.1 mm or more.