Lg Chem, Ltd

Jung Eun Kim

Jung Su Han

Seung Uk Yeu

Seung Hun Yang

Won Sang Kwon

Ji Hyun Kim

Byoung Yun Kim

Sang Jin Shin

Seung Whan Oh

Ho Yeul Choi

Hyun Woo Kim

Myung Su Jang

Chang Sun Han

Hyunwoo Kim

Chang Hun Lee

Do Young Ha

Yong Seok Jung

Yu Jin Cha

Wonsang Kwon

Won Tae Joe

Ji Young Lee

Jiyoon Jeong

A carboxylic acid-modified nitrile-based copolymer latex includes a carboxylic acid-modified nitrile-based copolymer including: 65.5 wt % to 82.5 wt % of a conjugated diene-based monomer-derived unit, 15 wt % to 30 wt % of an ethylenic unsaturated nitrile-based monomer-derived unit, and 2.5 wt % to 4.5 wt % of an ethylenic unsaturated acid monomer-derived unit, wherein the carboxylic acid-modified nitrile-based copolymer latex satisfies General Formula 1:1.0 mm/s≤≤3.0 mm/s  [General Formula 1]

Carboxylic acid modified-nitrile based copolymer latex

The present technology provides a carboxylic acid-modified nitrile-based copolymer latex including a carboxylic acid-modified nitrile-based copolymer including a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit, wherein a pKa is 9.5 to 10.2, and the carboxylic acid-modified nitrile-based copolymer latex satisfies General Formulas 1 and 2.

The present technology provides a carboxylic acid-modified nitrile-based copolymer latex including a carboxylic acid-modified nitrile-based copolymer including a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit, wherein the carboxylic acid-modified nitrile-based copolymer latex satisfies General Formulas 1 and General Formula 2.

The present technology relates to a latex composition for dip molding comprising a carboxylic acid-modified nitrile-based copolymer latex satisfying General Formulas 1 and 2, wherein the carboxylic acid-modified nitrile-based copolymer includes a conjugated diene-based monomer-derived unit, an ethylenic unsaturated nitrile-based monomer-derived unit, and an ethylenic unsaturated acid monomer-derived unit, and a molded article.

Carboxylic acid modified-nitrile based copolymer latex and latex composition for dip-forming comprising the copolymer latex and article formed by the composition

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.

Method for preparing carboxylic acid modified-nitrile based copolymer latex

A method of preparing a carboxylic acid-modified nitrile-based copolymer latex is provided. The method of preparing a carboxylic acid-modified nitrile-based copolymer later includes emulsion-polymerizing a monomer mixture including a conjugated diene-based monomer, an ethylenically unsaturated nitrile-based monomer, and an ethylenically unsaturated acid monomer in the presence of a cross-linking agent including glyoxal.

Method of preparing carboxylic acid-modified nitrile-based copolymer latex

Disclosed is a latex composition for dip molding including a carboxylic acid-modified nitrile-based copolymer latex satisfying General Formula 1, wherein the carboxylic acid-modified nitrile-based copolymer includes: 15 wt % to 30 wt % of the ethylenic unsaturated nitrile-based monomer-derived unit and 2.5 wt % to 4.5 wt % of the ethylenic unsaturated acid monomer-derived unit, and a molded article:1.0 mm/s≤CV≤3.0 mm/s.  General Formula 1

A latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex having pKa of 9.5 to 10.2 and satisfying General Formulas 1 and 2.0.85&#x2264;1.0,&#x2003;&#x2003;[General Formula 1]5&#x2264;20,&#x2003;&#x2003;[General Formula 2]

Provided are a carboxylic acid-modified nitrile-based copolymer latex composition, a preparation method thereof, a latex composition for dip-molding including the same, and an article molded by the same, the carboxylic acid-modified nitrile-based copolymer latex composition including: a carboxylic acid-modified nitrile-based copolymer, wherein the carboxylic acid-modified nitrile-based copolymer includes a 2-hydroxyethyl methacrylate monomer-derived repeating unit in an amount of more than 0.1 wt % to less than 12 wt %, and a coagulum in the carboxylic acid-modified nitrile-based copolymer latex composition has an amount of less than 1 wt %.

Carboxylic acid-modified nitrile-based copolymer latex composition, production method therefor, latex composition containing same for dip molding, and molded product molded therefrom

Provided is a dip-molded article, and more particularly, provided are a dip-molded article including: a layer derived from a latex composition for dip-molding; and a layer derived from a polymer including a repeating unit derived from a diacetylene-based compound, a latex composition for dip-molding, and a preparation method thereof.

Dip-molded article, latex composition for dip-molding and preparation method thereof

Provided is a carboxylic acid-modified nitrile-based copolymer latex, and more particularly, provided are a carboxylic acid-modified nitrile-based copolymer latex which includes a carboxylic acid-modified nitrile-based copolymer including a monomer-derived repeating unit; and a repeating unit derived from a monomer represented by Chemical Formula 1 below, the monomer-derived repeating unit including a conjugated diene-based monomer-derived repeating unit, an ethylenically unsaturated nitrile-based monomer-derived repeating unit, and an ethylenically unsaturated acid monomer-derived repeating unit (see description of the present invention), a method for preparing a carboxylic acid-modified nitrile-based copolymer latex, a latex composition for dip-forming including the copolymer latex, and an article formed by the composition.

Carboxylic acid modified nitrile based copolymer latex, method for preparing the copolymer latex, latex composition for dip-forming comprising the copolymer latex and article formed by the composition

The present invention relates to a carboxylic acid-modified nitrile-based copolymer latex, a preparation method for producing the same, a latex composition for dip-molding comprising the same, and a molding product prepared therefrom, more particularly to a carboxylic acid-modified nitrile-based copolymer latex capable of ensuring physical properties equivalent to or better than those using sulfur and vulcanization accelerators or cross-linking agents such as zinc oxide without using them by preparing the latex so that a large amount of anionic compound is present on the surface of the latex particles, a preparation method for producing the same, a latex composition for dip-molding comprising the same, and a molding product prepared therefrom.

Carboxylic acid-modified nitrile-based copolymer latex and latex composition for dip molding comprising same

The present invention relates to a latex composition for dip-molding and a molded article produced therefrom. More specifically, the above composition can be used to prepare the dip-molded articles having gentle syneresis, no stickiness, and excellent chemical resistance by using monoglyceride.

Latex composition for dip-molding, and molded article prepared from same

Disclosed is a latex composition for dip-molding and a dip-molded article produced therefrom. More specifically, a dip-molded article having slow syneresis, less stickiness and superior tensile strength is produce by dip-molding of a carbonic acid-modified nitrile-based copolymer latex having increased molecular stability due to the combined use of alkenylsuccinate, which is an emulsifier crosslinkable with the latex and having a flexible molecular structure.

Latex composition for dip-forming and dip-formed article produced therefrom

The present invention relates to a carbonic acid-modified nitrile-based copolymer latex, a process for producing the same, a latex composition for dip-molding comprising the latex composition and a molded article produced therefrom. More specifically, modified nitrile-based copolymer latex, which can improve the stability of latex even with the use of inorganic pigments by making the inherently modified nitrile-based copolymer latex, enables the production of a dip-molded article having a smoothness of syneresis, less stickiness, and excellent tensile strength, a process for producing the same, a latex composition for dip-molding comprising the same, and a molded article made therefrom.

Carboxylic acid-modified nitrile-based copolymer latex, method for preparing same, latex composition for dip molding containing same, and dip-molded article

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Daejeon, South Korea

Jung Eun Kim