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公开(公告)号：US10301402B2
公开(公告)日：2019-05-28
申请号：US15313766
申请日：2015-05-26
发明人： Yoshiaki Kozuka , Takehiro Omori
IPC分类号： C08F8/28 , C08F16/06 , C08F2/20 , C08F14/06 , C08F214/08
摘要： Provided is a dispersion stabilizer which exhibits an excellent polymerization stability when used in suspension polymerization for a vinyl chloride-based resin, and gives a vinyl chloride-based resin having few coarse particles, few fish eyes after resin molding, an excellent plasticizer absorption, and an excellent hue. Also provided is a high-quality vinyl chloride-based resin produced using the dispersion stabilizer. The present invention is a dispersion stabilizer for suspension polymerization containing a polyvinyl alcohol-based polymer (B) which has a double bond in a side chain and which is obtainable by acetalization of a polyvinyl alcohol-based polymer (A) with a monoaldehyde having an olefinic unsaturated double bond.
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2.发明申请公开(公告)号：US20190248931A1
公开(公告)日：2019-08-15
申请号：US16343377
申请日：2017-10-17
发明人： Takehiro Omori , Yoshiaki Kozuka
CPC分类号： C08F16/06 , C08F2/20 , C08F8/12 , C08F8/28 , C08F14/06 , C08F18/08 , C08F2500/02 , C08L29/04
摘要： Provided is a dispersion assistant useful for suspension polymerization of vinyl-based compounds. The dispersion assistant comprises a polyvinyl alcohol-based polymer (A) comprising a constituent unit represented by the general formula (1) shown below at 0.1 to 10 mol % per polyvinyl alcohol monomer unit and having a saponification degree of 15 to 70 mol %. (In the formula, R denotes an alkyl group.)
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公开(公告)号：US11339232B2
公开(公告)日：2022-05-24
申请号：US16343377
申请日：2017-10-17
发明人： Takehiro Omori , Yoshiaki Kozuka
摘要： Provided is a dispersion assistant useful for suspension polymerization of vinyl-based compounds. The dispersion assistant comprises a polyvinyl alcohol-based polymer (A) comprising a constituent unit represented by the general formula (1) shown below at 0.1 to 10 mol % per polyvinyl alcohol monomer unit and having a saponification degree of 15 to 70 mol %. (In the formula, R denotes an alkyl group.)
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4.发明申请公开(公告)号：US20170198068A1
公开(公告)日：2017-07-13
申请号：US15313766
申请日：2015-05-26
发明人： Yoshiaki Kozuka , Takehiro Omori
CPC分类号： C08F8/28 , C08F2/20 , C08F14/06 , C08F16/06 , C08F214/08 , C08F2/18 , C08F216/06
摘要： Provided is a dispersion stabilizer which exhibits an excellent polymerization stability when used in suspension polymerization for a vinyl chloride-based resin, and gives a vinyl chloride-based resin having few coarse particles, few fish eyes after resin molding, an excellent plasticizer absorption, and an excellent hue. Also provided is a high-quality vinyl chloride-based resin produced using the dispersion stabilizer. The present invention is a dispersion stabilizer for suspension polymerization containing a polyvinyl alcohol-based polymer (B) which has a double bond in a side chain and which is obtainable by acetalization of a polyvinyl alcohol-based polymer (A) with a monoaldehyde having an olefinic unsaturated double bond.
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公开(公告)号：US10731032B2
公开(公告)日：2020-08-04
申请号：US15778189
申请日：2016-11-29
发明人： Yoshiaki Kozuka , Takehiro Omori
摘要： An object of the present invention is to provide a dispersion assistant that, when used for suspension polymerization of a vinyl-based compound, achieves stable production of a good polymer (vinyl-based resin) without much scale adhesion on the polymerization tank even in the cases where used in a large amount. Provided is a dispersion assistant for suspension polymerization, which comprises a polyvinyl alcohol-based polymer (A) having an acetal group (a) having an olefinic unsaturated double bond, the polymer having a saponification degree of 60 mol% or less.
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公开(公告)号：US20190031872A1
公开(公告)日：2019-01-31
申请号：US15778189
申请日：2016-11-29
发明人： Yoshiaki Kozuka , Takehiro Omori
摘要： The purpose of the present invention is to provide a dispersion assistant with which it is possible to stably obtain an excellent polymeric substance (vinyl resin) with minimal adhering of scale to a polymerization vessel even when the dispersion assistant is used in a large amount in the suspension polymerization of a vinyl compound. The additive for suspension polymerization contains a polyvinyl alcohol polymer (A) that has a gelling degree of 60 mol % or less and has acetal groups (a) having olefinically unsaturated double bonds.
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