Method for producing polyvinyl acetal resin

A polyvinyl acetal resin and a technology for a manufacturing method, which are applied in the field of manufacturing polyvinyl acetal resin, can solve problems such as unfavorable energy, lowering the purity of polyvinyl acetal, side reactions, etc., and achieve rationalization and reduction of manufacturing processes. Effectiveness of drainage volume, simplified washing operation

Inactive Publication Date: 2008-08-13
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acetalization reaction carried out at a high temperature as used in the above examples is disadvantageous in terms of energy and requires a special reaction device, so it is difficult to call it an industrially practical method.
Also, the purity of polyvinyl acetal may be reduced due to its tendency to cause side reactions due to its reaction at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Into a 500mL stainless steel autoclave, put 10g of polyvinyl alcohol (Polymerization degree: 1700, Saponification degree: 99mol%, Alkali metal element (sodium) content: 1340ppm) and 100g of water, manufactured by Kuraray Co., Ltd., and heat to 90°C in nitrogen Let it dissolve. 10 g of this polyvinyl alcohol contains 0.225 mol of hydroxyl groups. 9.81 g (0.136 mol) of n-butyraldehyde having an acid value of 0.08 KOHmg / g was added thereto. At this time, the amount of aldehyde used was 1.2 times the theoretical amount for acetalizing all the hydroxyl groups of polyvinyl alcohol. Next, it heated to 160 degreeC, introduced carbon dioxide, and raised the pressure in the container to 1 MPa. When the solubility of carbon dioxide is represented by the mole fraction of carbon dioxide in the solution, it is 7.6×10 -4 . After 4 hours, cool to 90°C, release carbon dioxide to reduce pressure, and send 160 mL of isopropanol under pressure with nitrogen. Cool the resulting liquid,...

Embodiment 2

[0052] A polyvinyl butyral resin was produced in the same manner as in Example 1 except that the reaction temperature was 120°C. The solubility of carbon dioxide at this time is represented by the mole fraction of carbon dioxide in the solution, which is 16.3×10 -4 . In addition, the total chlorine content in polyvinyl acetal was below the detection limit, and the alkali metal content was 330 ppm. The results are shown in Table 1.

Embodiment 3

[0054] A polyvinyl butyral resin was produced in the same manner as in Example 1 except that the pressure in the reaction container was 2 MPa and the reaction temperature was 140°C. The solubility of carbon dioxide at this time is represented by the mole fraction of carbon dioxide in the solution, which is 29.8×10 -4 . In addition, the total chlorine content in polyvinyl acetal was below the detection limit, and the alkali metal content was 340 ppm. The results are shown in Table 1.

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Abstract

The present invention provides a method for producing polyvinyl acetal resin, which is characterized in that polyvinyl alcohol and carboxyl groups are mixed at 40 to 200°C in the presence of an acid catalyst containing carbon dioxide in a liquid using water and / or alcohol as a solvent. Compound reaction. According to this method, a polyvinyl acetal resin having a halogen content of 100 ppm or less and an alkali metal element content of 1000 ppm or less can be obtained without special washing operation. Therefore, the present invention provides a method for producing a polyvinyl acetal resin in which impurities such as metal salts and acids remain little.

Description

technical field [0001] The present invention relates to a method for producing polyvinyl acetal resin, and more particularly to a method for producing polyvinyl acetal resin characterized by reacting polyvinyl alcohol and aldehyde in the presence of an acid catalyst containing carbon dioxide. Background technique [0002] Polyvinyl acetal resin is a tough polymer with excellent chemical resistance, and exhibits strong adhesion to the surface of various materials. Since it has the above-mentioned characteristics, polyvinyl acetal resin is effective as a coating material, and can also be used as an interlayer film for safety glass. Polyvinyl acetal resins are widely used and can be used in various applications such as coatings, adhesives, adhesives, and moldings. [0003] The synthesis of polyvinyl acetals by the reaction of polyvinyl alcohol and aldehydes is well known. (For example, see Non-Patent Document 1). The production method of a representative polyvinyl acetal res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/28
CPCC08F8/28C08F216/38C08F8/48C08F16/06C08F16/38
Inventor 辻嘉久山中雅义楠藤健岩崎秀治杉冈尚
Owner KURARAY CO LTD
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