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Vinylpyrrolidone/vinyl acetate copolymer, process for producing the same, and use of the same

A technology of vinylpyrrolidone and vinyl acetate, which is applied in the field of vinylpyrrolidone-vinyl acetate copolymer, and can solve problems such as easy turbidity and coloring, and difficulty in adoption

Inactive Publication Date: 2007-10-03
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, as the production method of vinylpyrrolidone-vinyl acetate copolymer, in addition to the above-mentioned method, the method of polymerizing in an aqueous solvent can also be considered, but due to the existence of the polymer obtained by polymerization in an aqueous solvent Problems with clouding and coloring, making it difficult to use this method when it is desired to obtain a copolymer that dissolves in water as a clear solution

Method used

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  • Vinylpyrrolidone/vinyl acetate copolymer, process for producing the same, and use of the same
  • Vinylpyrrolidone/vinyl acetate copolymer, process for producing the same, and use of the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Add the mixed solvent of 40 parts of water / isopropanol (weight ratio)=5 / 5, 3 parts of N-vinylpyrrolidone and 3 parts of vinyl acetate in the reaction vessel that condensation pipe, nitrogen inlet pipe, thermometer are installed, stir Nitrogen gas is introduced at the same time to form a nitrogen atmosphere. Next, after heating with an oil bath so that the internal temperature of the reaction vessel reached 70° C., an initiator solution A was added, which was passed through a mixed solvent of 0.5 parts of water / isopropanol (weight ratio)=5 / 5. Formed by dissolving 0.03 parts of dimethyl-2,2'-azobisisobutyrate in Then, it took 4 hours to drop monomer solution A and initiator solution B respectively, wherein said monomer solution A contained 22.5 parts of N-vinylpyrrolidone and 17 parts of vinyl acetate, and said initiator solution B was passed through It is formed by dissolving 0.38 parts of dimethyl-2,2'-azobisisobutyrate in a mixed solvent of 7.2 parts of water / isopropa...

Embodiment 2

[0065] Except using the mixed solvent of water / isopropanol (weight ratio)=3 / 7 instead of the mixed solvent of water / isopropanol (weight ratio)=5 / 5 used in Example 1, operate in the same way as in Example 1 , carry out polymerization and distillation to obtain a colorless and transparent polymer solution with a concentration of 51.7% of vinylpyrrolidone / vinyl acetate copolymer. In addition, in distillation, residual N-vinylpyrrolidone / residual vinyl acetate (weight ratio) in the reaction liquid = 1.9 / 10 at the time when distilling off the solvent from the reaction liquid started. Moreover, at the moment of finishing the distillation (cooling moment), the concentration of N-vinylpyrrolidone in the reaction solution is reduced from 3720ppm before distillation to below 10ppm, and the concentration of vinyl acetate in the reaction solution is reduced from 19268ppm before distillation to below 50ppm. . And, the concentration of isopropanol is 0.1% or less.

[0066] The obtained po...

Embodiment 3

[0068] Add the mixed solvent of 40 parts of water / isopropanol (weight ratio)=5 / 5, 3.9 parts of N-vinylpyrrolidone and 2.6 parts of vinyl acetate to the polymerization vessel that condensation pipe, nitrogen gas introduction pipe, thermometer are installed, stir Nitrogen gas is introduced at the same time to form a nitrogen atmosphere. After heating with an oil bath to bring the internal temperature of the polymerization vessel to 70°C, add initiator solution A, which is obtained by dissolving 0.02 parts of dimethyl-2,2'-azobis in 0.5 parts of isopropanol formed from isobutyrate. Then, spend 4 hours to drop monomer solution A and initiator solution B respectively in this solution, wherein said monomer solution A contains 29.3 parts of N-vinylpyrrolidone and 23.5 parts of vinyl acetate, and said initiator solution B is formed by dissolving 0.25 parts of dimethyl-2,2'-azobisisobutyrate in 8 parts of isopropanol. After the dropwise addition, monomer solution B and initiator solu...

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Abstract

A vinylpyrrolidone / vinyl acetate copolymer which is extremely reduced in thermal yellowing and is usable even at high temperatures and which can dissolve in water to give a transparent solution. The vinylpyrrolidone / vinyl acetate copolymer has a residual vinylpyrrolidone content not higher than 100 ppm of the polymer on a solid basis. A 5 wt.% aqueous solution of the copolymer has an NTU value of 4.0 or smaller. When examined through the accelerated test in accordance with JIS-K3331, a 50 wt.% aqueous solution of the copolymer has a Hazen number (APHA) of 350 or smaller.

Description

technical field [0001] The present invention relates to a vinylpyrrolidone-vinyl acetate copolymer useful as a raw material of, for example, a gel hair dressing, its production method, and its use. Background technique [0002] It is known that vinylpyrrolidone-vinyl acetate copolymer is useful as a base polymer in various cosmetic applications, and it is considered to be one of the most suitable materials especially when used as a material for gel hair dressing. More specifically, as a vinylpyrrolidone-vinyl acetate copolymer used in various cosmetic applications represented by jelly hairdressing agents, a copolymer whose K value based on the Fikentscher method ( Hereinafter, sometimes simply referred to as "K value") is about a low value of 50 or less, and can be dissolved in water as a transparent solution. Such a vinylpyrrolidone-vinyl acetate copolymer is generally used. [0003] As a method of producing a vinylpyrrolidone-vinyl acetate copolymer having a low K value ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F226/10A61K8/00A61K8/72A61Q5/06C08F218/08
CPCA61K8/8182A61K8/042A61Q5/06C08F218/08C08F226/10
Inventor 今井大资泉启子中田善知
Owner NIPPON SHOKUBAI CO LTD
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