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Polychloroprene latex composition and process for producing the same

A technology of polychloroprene and chloroprene, which is applied in the direction of chloroprene adhesives, chloroprene homopolymer coatings, adhesives, etc., and can solve the problems of coating method limitations and concentration improvement

Inactive Publication Date: 2006-06-14
DENKA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of these latexes, since the viscosity of the latex itself becomes high, there are problems such as restrictions on the coating method, difficulty in increasing the solid content by concentration (refer to Japanese Patent Laid-Open No. 2000-303043 (page 2, claim 1~2; pages 3~5, embodiments 1~6) and Japanese Patent Application Laid-Open No. 2002-53703 (page 2, claims 1~2; pages 4~7, embodiments 1~6))

Method used

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  • Polychloroprene latex composition and process for producing the same
  • Polychloroprene latex composition and process for producing the same
  • Polychloroprene latex composition and process for producing the same

Examples

Experimental program
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Effect test

Embodiment 1

[0072] In a reactor with an internal volume of 3 liters, 0.6 parts of polyvinyl alcohol (PVA203: made by Kuraray Co., Ltd.) and 3.0 parts of polyoxyethylene alkyl ether (EMALGEN 1118S -70: manufactured by Kao Corporation, HLB value 16.4) was dissolved in 95 parts of water. After cooling this polyvinyl alcohol / nonionic emulsifier aqueous solution to near room temperature, 97 parts of chloroprene monomers, 3 parts of methacrylic acid, and 0.3 parts of octyl mercaptan were added. Keep it warm at 45°C, and use sodium sulfite and potassium persulfate as initiators to carry out polymerization. After the polymerization heat was not generated during the polymerization, it was allowed to stand for 1 hour, and this was regarded as the end point of the polymerization. A 20% aqueous diethanolamine solution was added to the obtained polychloroprene latex composition to adjust the pH to 7, and concentrated by heating under reduced pressure to prepare samples with a solid content of 50% and...

Embodiment 2、3

[0097] Except that the ratio of polyvinyl alcohol / nonionic emulsifier in embodiment 1 becomes 1.2 / 2.4 (embodiment 2) and 1.8 / 1.8 (embodiment 3) respectively, same as embodiment 1, prepare latex sample, Test and evaluate.

Embodiment 4

[0099] In Example 1, except that the nonionic emulsifier was changed to polyoxyethylene alkyl ether (Emalgen 1135S-70: manufactured by Kao Corporation, HLB value 17.9), a latex sample was prepared and tested and evaluated in the same manner as in Example 1. .

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PUM

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Abstract

The nonionic polychloroprene latex composition using polyvinyl alcohol as an emulsifying / dispersing agent has good chemical and mechanical stability, but due to high viscosity, there are problems such as restrictions on coating methods and difficulty in achieving high solid content . By emulsion polymerization of chloroprene alone or chloroprene and monomers that can be copolymerized with chloroprene in the presence of polyvinyl alcohol and non-ionic emulsifiers, low viscosity and high solid content can be obtained. Polychloroprene latex compositions.

Description

technical field [0001] The present invention relates to nonionic polychloroprene latex compositions having low viscosity. The polychloroprene latex composition is non-ionic and has low viscosity, so it has the advantages of being available for spraying, easy to achieve high solid content, etc., and is suitable as a raw material for water-based adhesives. Background technique [0002] As a polychloroprene latex composition, an anionic latex using roseic acid as an emulsifier is well known. However, when anionic latex using roseic acid as an emulsifier is used as a raw material of a water-based adhesive, there are difficulties in chemical and mechanical stability. As a means of improving this point, known anionic latex using special sulfonate as emulsifier, but because the latex is acidic, there are still problems such as low pH value and possible corrosion of metals (refer to for example, the following technology Vol .21, No.4 (2002) Volume 65 (page 17: item 2.2.2.2)). [...

Claims

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Application Information

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IPC IPC(8): C08L11/02C08F2/30C09D111/02C09J111/02
Inventor 渡边浩佑大势元博
Owner DENKA CO LTD
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