Dispersion stabilizer for suspension polymerization

A technology of dispersion stabilizer and suspension polymerization, used in transportation and packaging, dissolution, chemical instruments and methods, etc., can solve the problems of low solubility and insufficient handling, and achieve uniform particle size, plasticizer absorption and desorption. Excellent monomer properties and high polymerization stability

Active Publication Date: 2014-09-24
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, partially saponified PVA has low solubility in water and insufficient handling properties. Therefore, in order to improve handling properties, attempts have been made to improve the water solubility of PVA by introducing hydrophilic polyoxyethylene groups into the side chains of PVA.

Method used

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  • Dispersion stabilizer for suspension polymerization
  • Dispersion stabilizer for suspension polymerization
  • Dispersion stabilizer for suspension polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0075] Hereinafter, the present invention will be described in further detail using examples. In the following examples and comparative examples, unless otherwise specified, "parts" and "%" represent parts by mass and % by mass, respectively.

[0076] The POA-modified PVA (A) obtained by the following production example was evaluated by the following method.

[0077] [Viscosity-average degree of polymerization and degree of saponification of PVA]

[0078] The viscosity average polymerization degree and saponification degree of PVA were calculated|required by the method described in JISK6726.

[0079] [POA-based modification rate of PVA]

[0080] The POA group modification rate of PVA was calculated|required by the method using the above-mentioned proton NMR. In addition, JEOL GX-500 of 500 MHz was used for proton NMR.

manufacture example 1

[0081] [Manufacturing example 1: Manufacture of PVA (A1)]

[0082] In the 3L reactor that has agitator, reflux condenser, nitrogen introduction pipe, comonomer drop-in port and the addition port of initiator, the structure shown in 690g vinyl acetate, 2310g methyl alcohol, 7.1g table 2 is charged Nitrogen substitution was performed in the system for 30 minutes while nitrogen gas bubbling was performed for the monomer (monomer A) containing a POA group for block copolymerization. Also, as a delay solution, a comonomer solution having a concentration of 20% by dissolving a POA group-containing monomer (monomer A) in methanol was prepared, and nitrogen replacement was performed by bubbling nitrogen gas. The temperature of the reactor was started to rise, and when the internal temperature reached 60°C, 1.6 g of 2,2'-azobisisobutyronitrile (AIBN) was added to start polymerization. Polymerization was carried out at 60° C. for 6 hours while the delay solution was added dropwise so t...

manufacture example 2～16

[0083] [Manufacturing Examples 2-16: Manufacture of PVA (A2-16)]

[0084] Change the loading amount of vinyl acetate and methanol, the type and amount of unsaturated monomer with POA group used in polymerization, the polymerization rate and other polymerization conditions, the concentration of POA-modified PVAc in saponification, sodium hydroxide Except for the saponification conditions such as the molar ratio of vinyl acetate units, POA-modified PVA (A2-16) was produced in the same manner as in Example 1. The production conditions are shown in Table 1, and the structure of the unsaturated monomer having a POA group used is shown in Table 2.

[0085]

[0086] [Table 2]

[0087]

[0088] 1) * indicates the basal side of POA

[0089] 2) m and n are block-like respectively.

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Abstract

The purpose of the present invention is to provide a dispersion stabilizer for suspension polymerization, whereby polymer particles of uniform diameter can be manufactured with minimal formation of coarse particles, and whereby polymer particles can be obtained having reduced blocking and scaling, as well as extremely superior plasticizer absorption properties and monomer removal properties. [Solution] A dispersion stabilizer for suspension polymerization, containing a polyoxyalkylene-modified vinyl alcohol-based polymer (A) having a polyoxyalkylene group with 2 to 100 repeating units and 2-4 carbon atoms in an alkylene group in a side chain, the polyoxyalkylene-modified vinyl alcohol-based polymer (A) having a viscosity average degree of polymerization of less than 500 and a degree of saponification greater than 70 mol%, and the denaturation rate of the polyoxyalkylene group being 0.1 mol% to 10 mol%.

Description

technical field [0001] The present invention relates to a dispersion stabilizer for suspension polymerization of a vinyl compound containing a polyoxyalkylene-modified vinyl alcohol polymer. Background technique [0002] Conventionally, it is known to use a partially saponified vinyl alcohol polymer (hereinafter, the vinyl alcohol polymer may be abbreviated as PVA) as a dispersion stabilizer for suspension polymerization of a vinyl compound (for example, vinyl chloride). However, partially saponified PVA has low solubility in water and insufficient handling properties. Therefore, in order to improve handling properties, attempts have been made to introduce hydrophilic polyoxyethylene groups into the side chains of PVA to improve the water solubility of PVA. [0003] For example, a method of using PVA having a low degree of polymerization and a low degree of saponification and having an oxyalkylene group in a side chain as a dispersion stabilizer for suspension polymerization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/20C08F216/06C09K23/38C09K23/42C09K23/52
CPCC08F2/20C08F216/06
Inventor 福原忠仁熊木洋介仲前昌人
Owner KURARAY CO LTD
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