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N-vinyl amide polymer and production method thereof

A kind of vinyl amide, the technology of the manufacturing method, is applied in the N-vinyl amide polymer and its manufacture field, can solve the problem such as the record that there is no N-vinyl amide polymer manufacture

Inactive Publication Date: 2005-09-28
NIPPON SHOKUBAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] In these methods, there is no record about the manufacture of N-vinylamide polymers used in cosmetics or pharmaceuticals. There is still room for research in order to be suitable for the manufacture of such polymers.

Method used

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  • N-vinyl amide polymer and production method thereof
  • N-vinyl amide polymer and production method thereof
  • N-vinyl amide polymer and production method thereof

Examples

Experimental program
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specific Embodiment approach

[0132] The present invention will be described in more detail with reference to examples below, but the present invention is not limited to these examples. In addition, "part" means "weight part", and "%" means "mass %" unless otherwise specified.

[0133] [K value determination method]

[0134] The relative viscosity of the 1 mass % N-vinylamide polymer aqueous solution was measured with a capillary viscometer at 25° C., and the result was substituted into the following formula for calculation.

[0135] Logη rel / C=[(75K 0 2 ) / (1+1.5K 0 C)]+K 0

[0136] K=1000K 0

[0137] C: grams of N-vinylamide polymer in 100ml solution

[0138] n re1 : relative viscosity

[0139] [Methods for Measuring the Amount of N-Vinylpyrrolidone and the Amount of 2-Pyrrolidone]

[0140] Quantification was performed by liquid chromatography.

[0141] [Ash content determination method]

[0142] Based on the measurement method of the strong heat residue in the Japanese Pharmacopoeia.

[014...

Embodiment 1

[0146] use as figure 1 The polymerization apparatus shown was operated. An aqueous monomer solution containing 60 parts of N-vinylpyrrolidone and 40 parts of ion-exchanged water was prepared, and oxygen dissolved in the aqueous solution was sufficiently removed by bubbling nitrogen bubbles. Nitrogen exchange is performed on the inside of the reaction vessel in advance and the surface is heated to 100°C. The monomer aqueous solution is put into the reaction vessel from the feed port 1, and then the initiator solution is put into the feed port 2. The initiator solution is 0.06 One part of azo initiator V-59 (trade name, produced by Wako Pure Chemical Industries, Ltd., 2,2'-azobis (2-methylbutyronitrile)) was dissolved in 1 part of isopropanol (IPA) to form . The liquid depth of the reaction liquid in the reaction container was 10 mm. The polymerization was carried out under nitrogen flow, and the temperature of the reaction liquid reached 100° C. after about 5 minutes. There...

Embodiment 2

[0149] The reaction was carried out in exactly the same manner as in Example 1 except that the amount of the azo-based initiator was 0.12 parts. After about 5 minutes, the temperature of the reaction liquid reached 100°C. Thereafter, the temperature was maintained at not lower than 100° C. for 12 minutes to obtain a colorless, transparent, slightly soft solid block. As a result of analysis, the K value was 95.3, N-vinylpyrrolidone was 2400 ppm with respect to the resin component, and 0.1 ppm of 2-pyrrolidone was contained. In addition, the APHA of the 10% aqueous solution was 5, and the ash content was 200 ppm. The results are shown in Table 1.

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Abstract

The present invention provides an innovative N-vinylamide polymer with decreased contents of impurities and suppressed coloration, a higher K-value, and preferably usable in a variety of fields such as cosmetic and pharmaceutical products, and to provide a production method of the polymer. An N-vinylamide polymer comprising an N-vinylamide monomer unit, wherein the N-vinylamide polymer has K-value of 60 or higher, a content of hydrolysis products of N-vinylamide monomer of 0.02% by weight or less, a content of ashes of 0.1% by weight or less, and hue of 10% aqueous solution of 10 or less measured according to JIS K0071.

Description

technical field [0001] The present invention relates to N-vinylamide polymers and methods for their manufacture. More specifically, it relates to N-vinylamide polymers used in various applications such as raw materials for adhesives, paints, dispersants, inks, electronic parts, etc., in addition to additives for pharmaceuticals, cosmetics, and foods, and the like. Manufacturing method. Background technique [0002] N-vinylamide polymers are effectively used as additives for pharmaceuticals, cosmetics, foods, etc., as well as adhesives, Raw materials for the manufacture of paints, dispersants, inks, electronic components, etc. In order to use this N-vinylamide polymer well for the above-mentioned various applications, it is important to improve its quality, performance, safety and the like. [0003] Conventionally, for example, in the production of polyvinylpyrrolidone, it is known to hydrolyze N-vinylpyrrolidone (NVP) after polymerization to reduce remaining NVP. In this...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/12C08F26/02C08F26/10
CPCC08F26/10C08F26/02
Inventor 中田善知若尾典弘
Owner NIPPON SHOKUBAI CO LTD
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