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1.发明授权Hollow particles of crosslinked melamine resin having a uniform particles diameter and a process for producing the same 失效具有均匀颗粒直径的交联甲醛树脂的中空颗粒及其生产方法
公开(公告)号：US5190983A
公开(公告)日：1993-03-02
申请号：US651936
申请日：1991-02-07
申请人： Masami Bito , Satoshi Konishi , Fumimasa Fukazawa
发明人： Masami Bito , Satoshi Konishi , Fumimasa Fukazawa
CPC分类号： C08J3/14 , C08J9/32 , C08J2361/28
摘要： A process for producing hollow particles of crosslinked melamine resin having a uniform particles diameter, said process comprising subjecting a water-soluble methyl-etherified-melamine resin precondensate to condensation reaction in the presence of a curing catalyst in an aqueous solution containing a water-soluble polymer with carboxyl groups or water-soluble copolymer of ethylenically unsaturated carboxylic acid monomer, when the reaction liquid becomes turbid, adding to the reaction mixture a substance which dissolves or swells the melamine resin, and continuing the condensation reaction, if necessary.
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2.发明授权Hollow particles of crosslinked melamine resin having a uniform particle diameter and a process for producing the same 失效具有均匀粒径的交联三聚氰胺树脂的中空颗粒及其制造方法
公开(公告)号：US5360832A
公开(公告)日：1994-11-01
申请号：US218692
申请日：1994-03-28
申请人： Masami Bito , Satoshi Konishi , Fumimasa Fukazawa
发明人： Masami Bito , Satoshi Konishi , Fumimasa Fukazawa
CPC分类号： C08J3/14 , C08J9/32 , C08J2361/28
摘要： A process for producing hollow particles of crosslinked melamine resin having a uniform particles diameter, said process comprising subjecting a water-soluble methyl-etherified-melamine resin precondensate to condensation reaction in the presence of a curing catalyst in an aqueous solution containing a water-soluble polymer with carboxyl groups or water-soluble copolymer of ethylenically unsaturated carboxylic acid monomer, when the reaction liquid becomes turbid, adding to the reaction mixture a substance which dissolves or swells the melamine resin, and continuing the condensation reaction, if necessary.
摘要翻译： 一种生产具有均匀粒径的交联三聚氰胺树脂的中空颗粒的方法，所述方法包括使水溶性甲基醚化三聚氰胺树脂预缩合物在固化催化剂存在下在含有水溶性的水溶液中进行缩合反应 具有羧基的聚合物或烯键式不饱和羧酸单体的水溶性共聚物，当反应液变得浑浊时，如果需要，向反应混合物中加入溶解或溶胀三聚氰胺树脂的物质，并继续进行缩合反应。
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3.发明授权Process for producing particles of crosslinked melamine resin having a uniform particle diameter 失效生产具有均匀颗粒直径的交联甲醛树脂颗粒的方法
公开(公告)号：US5246616A
公开(公告)日：1993-09-21
申请号：US651934
申请日：1991-02-07
申请人： Masami Bito , Satoshi Konishi , Fumimasa Fukazawa
发明人： Masami Bito , Satoshi Konishi , Fumimasa Fukazawa
摘要： A process for producing the particles of crosslinked melamine resin having a uniform diameter in the following manner that water soluble precondensate of methyl-etherified melamine resin undergoes condensation reaction to give particles of crosslinked melamine resin having a uniform diameter, the condensation reaction is performed in an aqueous solution adjusted to a certain pH at 20.degree. to 70.degree. C., the aqueous solution contains a copolymer of acrylamide or methacrylamide with acrylic acid or methacrylic acid, a partial hydrolyzate of acrylamide or methacrylamide, or a saponified product of acrylonitrile, the pH adjustment is accomplished by an organic acid such as acetic acid, oxalic acid, formic acid, and p-toluenesulfonic acid, or an inorganic acid such as sulfuric acid and hydrochloric acid, which functions as a curing agent, and the preferred pH is in the range of 5 to 8.
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