公开(公告)号：US4946953A

公开(公告)日：1990-08-07

申请号：US107973

申请日：1987-10-13

申请人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto ,  Hideo Yoshidome

发明人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto ,  Hideo Yoshidome

IPC分类号： C08B15/10 ,  C08J3/16

CPC分类号： C08J3/16 ,  C08B15/10 ,  C08J2301/02

摘要： Fine crosslinked cellulose particles, wherein (1) said cellulose particles are composed substantially of a II-type cellulose crystalline phase and a non-crystalline cellulose phase, (2) said cellulose particles have a crystallinity, determined by X-ray diffractometry, of 5 to 35%, (3) said cellulose particles consist substantially of spherical to elongated spherical particles having an average particle diameter of not more than 300 .mu.m, and (4) said cellulose particles having an exclusion limit molecular weight by polyethylene glycol of not more than 4,000. The particles may have crosslinkage among the cellulose molecular chains in the non-crystalline phase. The fine crosslinked cellulose particles are prepared by (1) preparing fine particles of a coagulated viscose of cellulose xanthate, (2) subjecting the fine particles of coagulated viscose to crosslinking reaction and then neutralizing them with an acid, or first neutralizing said fine particles with an acid and then subjecting the neutralized particles to crosslinking reaction, and (3) separating the resulting fine crosslinked cellulose particles from the mother liquor, and heat-treating them after optionally subjecting them to desulfurization or to washing with an acid, water or methanol.

公开(公告)号：US5064950A

公开(公告)日：1991-11-12

申请号：US528933

申请日：1990-05-25

申请人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto ,  Hideo Yoshidome

发明人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto ,  Hideo Yoshidome

IPC分类号： C08B15/10 ,  C08J3/16

CPC分类号： C08J3/16 ,  C08B15/10 ,  C08J2301/02

摘要： Fine crosslinked cellulose particles, wherein (1) said cellulose particles are composed substantially of a II-type cellulose crystalline phase and a non-crystalline cellulose phase, (2) said cellulose particles have a crystallinity, determined by X-ray diffractometry, of 5 to 35%, (3) said cellulose particles consist substantially of spherical to elongated spherical particles having an average particle diameter of not more than 300 .mu.m, and (4) said cellulose particles having an exclusion limit molecular weight by polyethylene glycol of not more than 4,000. The particles may have crosslinkage among the cellulose molecular chains in the non-crystalline phase. The fine crosslinked cellulose particles are prepared by (1) preparing fine particles of a coagulated viscose of cellulose xanthate, (2) subjecting the fine particles of coagulated viscose to crosslinking reaction and then neutralizing them with an acid, or first neutralizing said fine particles with an acid and then subjecting the neutralized particles to crosslinking reaction, and (3) separating the resulting fine crosslinked cellulose particles from the mother liquor, and heat-treating them after optionally subjecting them to desulfurization or to washing with an acid, water or methanol.

公开(公告)号：US5244734A

公开(公告)日：1993-09-14

申请号：US145727

申请日：1988-01-15

申请人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto

发明人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto

IPC分类号： C08B16/00 ,  C08J3/16 ,  C08L1/06

CPC分类号： C08J3/16 ,  C08B16/00 ,  C08L1/06 ,  C08J2301/06 ,  Y10T428/2982 ,  Y10T428/2998

摘要： A process for producing fine cellulose particles, which comprises(1) mixing viscose with a water-soluble anionic polymeric compound or polyethylene glycol or its derivative to form a dispersion of fine particles of viscose,(2) (i) heating the dispersion or mixing it with a coagulating agent to thereby coagulate the viscose in the dispersion, and thereafter neutralizing it with an acid to form fine particles of cellulose, or (ii) coagulating and neutralizing the dispersion with an acid to form fine particles of cellulose, and(3) thereafter, separating the fine particles of cellulose from the mother liquor. The fine cellulose particles(a) are composed substantially of II-type cellulose,(b) have a crystallinity, of 5 to 35% by weight,(c) are composed substantially of particles of not more than 20 micrometers, and(d) have a sharp particle size distribution.

摘要翻译： 一种生产精细纤维素颗粒的方法，其包括（1）将粘胶与水溶性阴离子聚合物或聚乙二醇或其衍生物混合以形成粘胶细颗粒的分散体，（2）（i）加热分散体或混合 用凝结剂凝结分散体中的粘胶，然后用酸中和，形成纤维素微粒，或者（ii）用酸凝固和中和分散体，形成纤维素的微粒;（3） ）之后，从母液中分离纤维素的微粒。 微细纤维素颗粒（a）基本上由II型纤维素组成，（b）具有5-35重量％的结晶度，（c）基本上由不大于20微米的颗粒组成，和（d） 具有尖锐的粒度分布。

公开(公告)号：US4902792A

公开(公告)日：1990-02-20

申请号：US139860

申请日：1987-12-30

申请人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto

发明人： Shigeru Okuma ,  Kanji Yamagishi ,  Masami Hara ,  Keizo Suzuki ,  Toshihiro Yamamoto

IPC分类号： C08J3/16

CPC分类号： C08J3/16 ,  C08J2301/06 ,  Y10T428/2982

摘要： A process for producing fine cellulose particles, which comprises(1) mixing viscose with a water-soluble anionic polymeric compound or polyethylene glycol or its derivative to form a dispersion of fine particles of viscose,(2) (i) heating the dispersion or mixing it with a coagulating agent to thereby coagulate the viscose in the dispersion, and thereafter neutralizing it with an acid to form fine particles of cellulose, or (ii) coagulating and neutralizing the dispersion with an acid to form fine particles of cellulose, and(3) thereafter, separating the fine particles of cellulose from the motor liquor. The fine cellulose particles(a) are composed substantially of II-type cellulose,(b) have a crystallinity, of 5 to 35% by weight,(c) are composed substantially of particles of not more than 20 micrometers, and(d) have a sharp particle size distribution.

摘要翻译： 一种生产精细纤维素颗粒的方法，其包括（1）将粘胶与水溶性阴离子聚合物或聚乙二醇或其衍生物混合以形成粘胶细颗粒的分散体，（2）（i）加热分散体或混合 用凝结剂凝结分散体中的粘胶，然后用酸中和，形成纤维素微粒，或者（ii）用酸凝固和中和分散体，形成纤维素的微粒;（3） ），然后从运动液中分离纤维素的细颗粒。 微细纤维素颗粒（a）基本上由II型纤维素组成，（b）具有5-35重量％的结晶度，（c）基本上由不大于20微米的颗粒组成，和（d） 具有尖锐的粒度分布。