公开(公告)号：US06777083B1

公开(公告)日：2004-08-17

申请号：US09622057

申请日：2000-10-12

申请人： Hirotoshi Mizota ,  Tomonari Murakami ,  Yoshihiro Uozu ,  Shigeaki Sasaki ,  Koji Ishizaka ,  Takeshi Kitayama ,  Tatsuyuki Takayanagi ,  Jun-ichiro Atarashi ,  Yasukazu Yoshida ,  Masaharu Yanai ,  Motomu Oh-Kita

发明人： Hirotoshi Mizota ,  Tomonari Murakami ,  Yoshihiro Uozu ,  Shigeaki Sasaki ,  Koji Ishizaka ,  Takeshi Kitayama ,  Tatsuyuki Takayanagi ,  Jun-ichiro Atarashi ,  Yasukazu Yoshida ,  Masaharu Yanai ,  Motomu Oh-Kita

IPC分类号： D02G300

CPC分类号： C08F20/14 ,  C08F2/02 ,  C08F4/04 ,  G02B6/02033 ,  Y10T428/2929 ,  Y10T428/2938 ,  Y10T428/2967

摘要： This invention provides a process for manufacturing a methyl methacrylate polymer comprising the steps of feeding a monomer containing at least 80 wt % of methyl methacrylate and a radical polymerization initiator represented formula (III) to a reactor; polymerizing the material at a polymerization temperature of 110 to 160° C. under the conditions satisfying particular equations between an initiator concentration and a polymerization temperature; feeding a reaction mixture taken out from the reactor to a devolatilization step (feeding step); and separating and removing volatiles from the reaction mixture (devolatilization step). A methyl methacrylate polymer having adequately good optical properties and a plastic optical fiber having improved transmission performance can be prepared according to this invention.

公开(公告)号：US07098281B2

公开(公告)日：2006-08-29

申请号：US10824524

申请日：2004-04-15

申请人： Hirotoshi Mizota ,  Tomonari Murakami ,  Yoshihiro Uozu ,  Shigeaki Sasaki ,  Koji Ishizaka ,  Takeshi Kitayama ,  Tatsuyuki Takayanagi ,  Jun-ichiro Atarashi ,  Yasukazu Yoshida ,  Masaharu Yanai ,  Motomu Oh-Kita

发明人： Hirotoshi Mizota ,  Tomonari Murakami ,  Yoshihiro Uozu ,  Shigeaki Sasaki ,  Koji Ishizaka ,  Takeshi Kitayama ,  Tatsuyuki Takayanagi ,  Jun-ichiro Atarashi ,  Yasukazu Yoshida ,  Masaharu Yanai ,  Motomu Oh-Kita

IPC分类号： C08F4/04

CPC分类号： C08F20/14 ,  C08F2/02 ,  C08F4/04 ,  G02B6/02033 ,  Y10T428/2929 ,  Y10T428/2938 ,  Y10T428/2967

摘要： This invention provides a process for manufacturing a methyl methacrylate polymer comprising the steps of feeding a monomer containing at least 80 wt % of methyl methacrylate and a radical polymerization initiator represented formula (III) to a reactor; polymerizing the material at a polymerization temperature of 110 to 160° C. under the conditions satisfying particular equations between an initiator concentration and a polymerization temperature; feeding a reaction mixture taken out from the reactor to a devolatilization step (feeding step); and separating and removing volatiles from the reaction mixture (devolatilization step). A methyl methacrylate polymer having adequately good optical properties and a plastic optical fiber having improved transmission performance can be prepared according to this invention

摘要翻译： 本发明提供一种制备甲基丙烯酸甲酯聚合物的方法，包括以下步骤：将含有至少80重量％的甲基丙烯酸甲酯和式（III）的自由基聚合引发剂的单体进料到反应器中; 在聚合温度为110〜160℃，在引发剂浓度和聚合温度之间满足特定方程的条件下聚合材料; 将从反应器中取出的反应混合物进料到脱挥发分步骤（进料步骤）; 并从反应混合物中分离和除去挥发物（脱挥发分步骤）。 可以根据本发明制备具有良好光学性能的甲基丙烯酸甲酯聚合物和具有改进的透射性能的塑料光纤

公开(公告)号：US06710204B2

公开(公告)日：2004-03-23

申请号：US10103867

申请日：2002-03-25

申请人： Masanori Tokuda ,  Yasukazu Yoshida ,  Junichi Doi ,  Motomu Oh-Kita

发明人： Masanori Tokuda ,  Yasukazu Yoshida ,  Junichi Doi ,  Motomu Oh-Kita

IPC分类号： C08C6748

CPC分类号： C07D235/02 ,  C07D211/94 ,  C07D471/10

摘要： There is provided a superior decreasing method of an N-oxyl compound contained in an easily polymerizable material, according to which the N-oxyl compound contained in an easily polymerizable material can be sufficiently decreased and loss of the easily polymerizable material is little. The easily polymerizable material containing an N-oxyl compound and an acid are contacted with each other. In addition, not only the N-oxyl compound but also an organic titanium group compound contained in the easily polymerizable material can be sufficiently decreased.

摘要翻译： 提供易于聚合的材料中所含的N-氧基化合物的降低方法，可以充分降低容易聚合的材料中含有的N-氧基化合物，容易聚合的材料的损失小。 含有N-氧基化合物和酸的易聚合性材料彼此接触。 此外，不仅可以充分降低容易聚合的材料中所含的N-氧基化合物和有机钛基化合物。

公开(公告)号：US06348619B1

公开(公告)日：2002-02-19

申请号：US09230355

申请日：1999-01-25

申请人： Yasukazu Yoshida ,  Yuji Mikami ,  Motomu Oh-Kita

发明人： Yasukazu Yoshida ,  Yuji Mikami ,  Motomu Oh-Kita

IPC分类号： C07C6700

CPC分类号： C07C67/39

摘要： A carboxylic acid ester is prepared by a process comprising: reacting an aldehyde and an alcohol in a liquid phase in the presence of molecular oxygen as indicated by the following reaction: RCHO+R′OH+O2→RCOOR′+H2O in the presence of a catalyst comprising at least palladium and an element X, wherein X is bismuth, lead or a combination thereof, supported on a carrier, wherein the catalyst has an acid strength, pKa, of more than 4.8 and shows an ammonia chemical adsorption amount at 0° C. of 0-150 &mgr;mol/g-catalyst.

摘要翻译： 羧酸酯的制备方法包括：在分子氧存在下，在液相中使醛和醇反应，如以下反应所示：在至少包含钯和元素X的催化剂存在下，其中 X是负载在载体上的铋，铅或其组合，其中催化剂的酸强度pKa大于4.8，在0℃下显示出0-150Mumol / g催化剂的氨化学吸附量 。

公开(公告)号：US06642394B2

公开(公告)日：2003-11-04

申请号：US10363912

申请日：2003-03-10

申请人： Naoshi Murata ,  Kimio Tamura ,  Yasukazu Yoshida ,  Motomu Ohkita

发明人： Naoshi Murata ,  Kimio Tamura ,  Yasukazu Yoshida ,  Motomu Ohkita

IPC分类号： C07D30930

CPC分类号： C07C67/08 ,  C07C51/56 ,  C07C2603/74 ,  C07C57/04 ,  C07C69/54

摘要： (Meth)acrylic acid is reacted with a fatty acid anhydride and the resultant reaction mixture is neutralized and washed with an aqueous alkaline solution having a pH of 7.5 to 13.5. Thus, high-purity (meth)acrylic anhydride can be industrially advantageously produced while avoiding polymerization. This (meth)acrylic anhydride is reacted with a secondary or tertiary alcohol in the presence of a basic compound which in 25° C. water has an acidity (pKa) of 11 or lower. Thus, a high-purity (meth)acrylic ester can be produced in high yield.

摘要翻译： （甲基）丙烯酸与脂肪酸酐反应，中和得到的反应混合物，并用pH为7.5〜13.5的碱性水溶液洗涤。 因此，高纯度（甲基）丙烯酸酐可以在工业上有利地生产，同时避免聚合。 该（甲基）丙烯酸酐在碱性化合物的存在下与仲醇或叔醇反应，其中25℃的水的酸度（pKa）为11或更低。 因此，可以高产率制备高纯度（甲基）丙烯酸酯。