Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Dispersion stabilizer for suspension polymerization and method for producing vinyl polymer using same

A technology of dispersion stabilizer and vinyl compound, which is applied in the field of manufacture of dispersion stabilizer for suspension polymerization and vinyl-based polymers using the same, can solve the problems of insufficient demand, many insoluble components in aqueous solution, and many fish eyes, etc. , to achieve the effect of coarse-grained inhibition, fish-eye reduction, and good dispersibility

Active Publication Date: 2020-03-17
KURARAY CO LTD
View PDF6 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the method described in the above-mentioned patent document, although an improvement is observed in the polymerization stability at the time of polymerization of the vinyl compound, it is not sufficient for the demand demanded in recent years.
Furthermore, there are still problems such as pockmarks when molding vinyl polymers into sheets, many fish eyes due to defects, and many insoluble components in aqueous solutions due to the presence of reactive double bonds.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Dispersion stabilizer for suspension polymerization and method for producing vinyl polymer using same
  • Dispersion stabilizer for suspension polymerization and method for producing vinyl polymer using same
  • Dispersion stabilizer for suspension polymerization and method for producing vinyl polymer using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0098] Hereinafter, the present invention will be explained in further detail through examples. In the following examples and comparative examples, unless otherwise specified, "parts" and "%" respectively represent parts by mass and% by mass, and ppm represents ppm by mass.

[0099] [Viscosity average degree of polymerization of PVA(A)]

[0100] The viscosity average degree of polymerization of PVA (A) is measured in accordance with JIS K 6726:1994. Specifically, when the degree of saponification of PVA (A) is less than 99.5 mol%, for PVA saponified until the degree of saponification reaches 99.5 mol% or more, the intrinsic viscosity measured in water at 30°C [η](L / g) The viscosity average degree of polymerization (P) is obtained by the following formula.

[0101] P=([η]×10 4 / 8.29) (1 / 0.62)

[0102] [Saponification degree of PVA(A)]

[0103] The saponification degree of PVA(A) is measured in accordance with JIS K 6726:1994.

[0104] [The content of the terminal propyl group of PVA(A...

manufacture example 1-1

[0115] [Production Example 1-1 Production of PVA (A1-1)]

[0116] After charging 1500 parts of vinyl acetate (hereinafter sometimes referred to as "VAc"), 30 parts of methanol, and 6.7 parts of trimethylolpropane diallyl ether into the polymerization tank, 25.5 parts of acetaldehyde was additionally charged after nitrogen replacement, The temperature was raised to 60°C by heating, and polymerization was performed in the presence of 2,2'-azobis(isobutyronitrile) as an initiator until the polymerization rate reached 50%. While adding methanol, an operation of discharging the remaining VAc and methanol to the outside of the system under reduced pressure was performed to obtain a methanol solution (concentration 50% by mass) of a vinyl ester copolymer (hereinafter sometimes referred to as “PVAc”). Next, in a mixed solvent of methanol and methyl acetate (the concentration of methyl acetate is 10% by mass relative to the total saponification system), the concentration of the vinyl este...

manufacture example 1-2~1-16

[0117] [Manufacturing example 1-2~1-16 PVA (A1-2)~(A1-16) manufacturing]

[0118] Change the usage amount of vinyl acetate and methanol, the type and usage amount of monomers with two or more olefinic double bonds, the type and usage amount of single-terminal modifier, and the polymerization rate as described in Tables 1 to 3, Except for the saponification conditions, PVA (A1-2) to PVA (A1-16) were produced in the same manner as in Production Example 1. The production conditions and production results are shown in Table 1, the types of monomers used are shown in Table 2, and the types of single-end modifiers used are shown in Table 3.

[0119]

[0120] 【Table 2】

[0121] species Comonomer A Trimethylolpropane diallyl ether B 1,4-butanediol divinyl ether

[0122] 【table 3】

[0123] species Single terminal modifier A Acetaldehyde B Butyraldehyde C Octanal

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
saponificationaaaaaaaaaa
saponificationaaaaaaaaaa
saponificationaaaaaaaaaa
Login to View More

Abstract

The present invention provides: a dispersion stabilizer for suspension polymerization that is excellent in polymerization stability when subjecting a vinyl compound to suspension polymerization, can provide a vinyl polymer with a smaller number of coarse particles and can reduce fish eyes on a sheet formed from the obtained vinyl polymer; and a method for producing the same. The present inventionpertains to a dispersion stabilizer for suspension polymerization of a vinyl compound, the dispersion stabilizer comprising a vinyl alcohol polymer (A) that has a viscosity average polymerization degree of more than 400 and less than 1000, and a saponification degree of more than 67 mol% and less than 78 mol%, that includes 0.02-1.0 mol% of a group having an ethylenic double bond in a side chain,and that shows an absorbance (x) of more than 0.17 and less than 0.65 at 280 nm in a UV ray absorbing spectrum of a 0.1-mass% aqueous solution.

Description

Technical field [0001] The present invention relates to a dispersion stabilizer for suspension polymerization and a method for producing a vinyl polymer using the dispersion stabilizer. The dispersion stabilizer for suspension polymerization contains a saponification degree and a viscosity average degree of polymerization in a specific range, and a side chain in a specific ratio A vinyl alcohol-based polymer having a group having an olefinic double bond and having a specific absorbance. Background technique [0002] As one of the uses of polyvinyl alcohol (hereinafter abbreviated as "PVA"), there is a dispersion stabilizer for suspension polymerization of vinyl compounds, and various PVAs are used. [0003] For example, in Patent Documents 1 and 2, heat-treated PVA is used for dispersion stabilization for suspension polymerization of vinyl compounds in order to improve the polymerization stability during the polymerization of vinyl compounds and suppress the coarsening of the obtai...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/12C08F2/38C08F2/44
CPCC08F2/38C08F2/44C08F8/12C08F218/08C08F118/08C08F18/08C08F8/14C08F114/06C08F14/06C08K5/12C08F116/06C08F216/06C08F2810/30C08F216/125C08F2/20C08L27/06C08L29/04C08F2/18C08F214/06
Inventor 福原忠仁天野雄介
Owner KURARAY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com