Latex Composition for Dip Molding, Molded Article Molded from Latex Composition for Dip Molding, and Method of Producing Molded Article

Patent metadata

Field	Value
Publication number	US-2022055256-A1
Application number	US-202017416203-A
Country	US
Kind code	A1
Filing date	Sep 1, 2020
Priority date	Oct 7, 2019
Publication date	Feb 24, 2022
Grant date	—

Abstract

A dip-molded article includes an external molded layer and internal molded layer. The external molded layer includes a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 35 wt % to 60 wt %, and the internal molded layer in which a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 10 wt % to 28 wt %.

First claim

1 . A dip-molded article comprising:
an external molded layer in which a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 35 wt % to 60 wt %; and an internal molded layer in which a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 10 wt % to 28 wt %.

2 . The dip-molded article of claim 1 , wherein each of the external molded layer and the internal molded layer further includes a conjugated diene-based monomer-derived repeating unit and an ethylenically unsaturated acid monomer-derived repeating unit.

3 . The dip-molded article of claim 2 , wherein a content of the conjugated diene-based monomer-derived repeating unit included in the external molded layer is 30 wt % to 65 wt %, and a content of the ethylenically unsaturated acid monomer-derived repeating unit included in the external molded layer is 0.1 wt % to 10 wt %.

4 . The dip-molded article of claim 2 , wherein a content of the conjugated diene-based monomer-derived repeating unit included in the internal molded layer is 60 wt % to 90 wt %, and a content of the ethylenically unsaturated acid monomer-derived repeating unit included in the internal molded layer is 0.1 wt % to 10 wt %.

5 . The dip-molded article of claim 1 , wherein a ratio of a thickness of the external molded layer and a thickness of the internal molded layer is 1:9 to 9:1.

6 . The dip-molded article of claim 1 , wherein a ratio of a thickness of the external molded layer and a thickness of the internal molded layer is 1.5:1 to 2.5:1.

7 . A method of producing a dip-molded article, comprising:
attaching a coagulant to a dip molding mold; dipping the dip molding mold to which the coagulant is attached into a first latex composition for dip molding to form a layer derived from the first latex composition for dip molding; dipping the dip molding mold into a second latex composition for dip molding to form a layer derived from the second latex composition for dip molding; and heating the layer derived from the first latex composition for dip molding and the layer derived from the second latex composition for dip molding to cross-link the first latex composition for dip molding and the second latex composition for dip molding, wherein the first latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex in which a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 35 wt % to 60 wt %, and wherein the second latex composition for dip molding includes a carboxylic acid-modified nitrile-based copolymer latex in which a content of an ethylenically unsaturated nitrile-based monomer-derived repeating unit is 10 wt % to 28 wt %.

8 . The method of claim 7 , wherein in the dipping the dip molding mold into the first latex composition and the dipping the dip molding mold into the second latex composition, a dipping time is 5 seconds to 20 seconds.

9 . The method of claim 7 , wherein a solid content concentration of the first latex composition for dip molding is 10 wt % to 20 wt %, and a solid content concentration of the second latex composition for dip molding is 21 wt % to 35 wt %.

10 . The method of claim 7 , wherein the carboxylic acid-modified nitrile-based copolymer latex included in each of the first latex composition for dip molding and the second latex composition for dip molding further includes a conjugated diene-based monomer-derived repeating unit and an ethylenically unsaturated acid monomer-derived repeating unit.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Tae Shik
• Kwon Won Sang
• Yeu Seung Uk
• Oh Seung Whan

Classifications

• C08L13/02

  Latex · CPC title

• B29K2019/00

  Use of rubber not provided for in a single one of main groups {B29K2007/00 - B29K2011/00,} as moulding material · CPC title

• B29C41/52

  Measuring, controlling or regulating · CPC title

• B29C41/22

  Making multilayered or multicoloured articles · CPC title

• B29C41/003

  characterised by the choice of material · CPC title