Patents by Inventor Yoshifumi Fukui
Yoshifumi Fukui has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8541103Abstract: The present invention provides silicone polymer particles having excellent tensile properties and excellent transparency and also provides a silicone composition. The present invention relates to silicone polymer particles having a silicone core-alkoxysilane condensate shell structure in which silicone particles with a volume-average particle diameter of 0.001 ?m to 1.0 ?m are coated with an alkoxysilane condensate, and also relates to a silicone composition containing (A) the silicone polymer particles, (B) a polyorganosiloxane having at least one alkenyl group in its molecule, and (C) a curing agent. The present invention further relates to respective manufacturing methods of the silicone polymer particles and the silicone composition.Type: GrantFiled: December 2, 2005Date of Patent: September 24, 2013Assignee: Kaneka CorporationInventors: Yoshifumi Fukui, Satoshi Sugiyama, Akira Takaki
-
Publication number: 20080234436Abstract: The present invention provides a polyolefin graft copolymer which is produced by graft copolymerization of an olefin monomer and a macromonomer, which has good handleability and excellent dispersibility in a thermoplastic resin. In a composition including the polyolefin graft copolymer, excellent surface wettability is exhibited and the increase in elastic modulus is suppressed. The invention also provides a method for producing the polyolefin graft copolymer. Furthermore, the invention provides a composition containing the copolymer and a production method therefor. The polyolefin graft copolymer can be produced, in the presence of a coordination polymerization catalyst, by graft-copolymerizing an olefin monomer and a macromonomer having a multilayer structure in an aqueous system.Type: ApplicationFiled: October 20, 2004Publication date: September 25, 2008Inventors: Harumi Sakamoto, Yoshifumi Fukui
-
Patent number: 7378474Abstract: The present invention provides an olefin polymerization catalyst composed of a late transition metal complex exhibiting high olefin polymerization activity and also provides a method for producing the same. Furthermore, the present invention provides an olefin polymer prepared using the catalyst and a method for producing the olefin polymer. The olefin polymerization catalyst is composed of a fluorine-containing late transition metal complex having a structure represented by a specified general formula. The polymerization catalyst can be prepared in the reaction system.Type: GrantFiled: February 14, 2005Date of Patent: May 27, 2008Assignee: Kaneka CorporationInventor: Yoshifumi Fukui
-
Patent number: 7335703Abstract: A novel polyolefin graft copolymer prepared by graft-copolymerizing an olefin monomer with a (meth)acryl macromonomer or an isobutylene macromonomer in the presence of a coordination polymerization catalyst based on a late transition metal complex and a method for making the novel polyolefin graft copolymer are provided.Type: GrantFiled: August 7, 2002Date of Patent: February 26, 2008Assignee: Kaneka CorporationInventor: Yoshifumi Fukui
-
Publication number: 20080009593Abstract: A polyolefin graft copolymer formed by graft copolymerization of an olefinic monomer and a macromonomer and the production process therefor are provided. The polyolefin graft copolymer is produced from a macromonomer obtained by radical emulsion polymerization of a vinyl monomer, by using a redox initiator containing a polymerization initiator, an activator, a reductant, and an oxygen coordination type-chelating age.Type: ApplicationFiled: April 12, 2005Publication date: January 10, 2008Applicant: KANEKA CORPORATIONInventors: Harumi Sakamoto, Yoshifumi Fukui
-
Publication number: 20070298256Abstract: The present invention provides silicone polymer particles having excellent tensile properties and excellent transparency and also provides a silicone composition. The present invention relates to silicone polymer particles having a silicone core-alkoxysilane condensate shell structure in which silicone particles with a volume-average particle diameter of 0.001 ?m to 1.0 ?m are coated with an alkoxysilane condensate, and also relates to a silicone composition containing (A) the silicone polymer particles, (B) a polyorganosiloxane having at least one alkenyl group in its molecule, and (C) a curing agent. The present invention further relates to respective manufacturing methods of the silicone polymer particles and the silicone composition.Type: ApplicationFiled: December 2, 2005Publication date: December 27, 2007Applicant: KANEKA CORPORATIONInventors: Yoshifumi Fukui, Satoshi Sugiyama, Akira Takaki
-
Publication number: 20070244261Abstract: The present invention provides a polyolefin graft copolymer produced by copolymerizing a macromonomer latex which is obtained by radical emulsion polymerization of a vinyl monomer, with an olefin monomer, and also provides a method for producing the same, and a composition. A polyolefin graft copolymer can be produced by copolymerizing a macromonomer latex which is obtained by radical emulsion polymerization of a vinyl monomer, with an olefin monomer in the presence of an olefin polymerization catalyst composed of a certain ligand and nickel as the central metal.Type: ApplicationFiled: June 14, 2005Publication date: October 18, 2007Applicant: KANEKA CORPORATIONInventors: Yoshifumi Fukui, Harumi Sakamoto
-
Publication number: 20070167316Abstract: The present invention provides an olefin polymerization catalyst composed of a late transition metal complex exhibiting high olefin polymerization activity and also provides a method for producing the same. Furthermore, the present invention provides an olefin polymer prepared using the catalyst and a method for producing the olefin polymer. The olefin polymerization catalyst is composed of a fluorine-containing late transition metal complex having a structure represented by a specified general formula. The polymerization catalyst can be prepared in the reaction system.Type: ApplicationFiled: February 14, 2005Publication date: July 19, 2007Inventor: Yoshifumi Fukui
-
Publication number: 20070123656Abstract: The present invention provides a polyolefin copolymer in which an olefin monomer is graft-copolymerized to modified particles of a metallic compound. The polyolefin graft copolymer can be obtained by graft-copolymerizing the olefin monomer to modified particles of a metallic compound in the presence of a coordination polymerization catalyst in the presence of, particularly, a coordination polymerization catalyst of a late transition metal complex. Further, the property of a polyolefin resin can be improved by blending the polyolefin graft copolymer to a polyolefin resin.Type: ApplicationFiled: September 17, 2004Publication date: May 31, 2007Inventors: Yoshifumi Fukui, Harumi Sakamoto
-
Publication number: 20060223943Abstract: With respect to graft copolymerization of an olefin monomer with a silicone macromonomer produced by emulsion polymerization, a novel polyolefin graft copolymer and a process for producing the copolymer are provided. A composition containing the copolymer and a process for producing the composition are also provided. In the presence of a late transition metal complex coordination polymerization catalyst, an olefin monomer and a silicone macromonomer prepared by emulsion polymerization are graft copolymerized.Type: ApplicationFiled: April 7, 2004Publication date: October 5, 2006Inventors: Harumi Sakamoto, Yoshifumi Fukui
-
Publication number: 20060211824Abstract: The present invention provides a polyolefin graft copolymer which is produced by graft copolymerization of an olefin monomer and a (meth)acrylic macromonomer and which has good powder characteristics, a polyolefin graft copolymer composition, and a method for producing such a polyolefin graft copolymer. The invention also provides a composition containing the copolymer and a method for producing such a composition. In the presence of a late transition metal complex coordination polymerization catalyst, an olefin monomer and a (meth)acrylic macromonomer having a glass transition temperature of 30° C. or higher are graft-copolymerized.Type: ApplicationFiled: August 10, 2004Publication date: September 21, 2006Inventors: Harumi Sakamoto, Yoshifumi Fukui
-
Patent number: 7026406Abstract: A syndiotactic styrenic polymer having a narrow molecular weight distribution which is a (co)polymer comprising at least one structural unit represented by the following Formula (1): wherein C1 of a phenyl group thereof has a tacticity of 30% or more in terms of a racemic pentad determined by 13C-NMR, and Ra and m are as defined in the specification. The disclosure is also directed to a block copolymer comprising the above polymer as one segment, to a block graft polymer prepared by modifying one block of the above polymer with a nitrogen-containing aromatic polymer, and to a process for preparing a syndiotactic styrenic polymer in which a styrenic monomer is polymerized in the presence of a catalyst comprising a reaction product of a transition metal compound and at least one co-catalyst selected from organic aluminunoxy compounds.Type: GrantFiled: September 4, 2000Date of Patent: April 11, 2006Assignees: National Institute of Advanced Industrial Science and Technology, Japan Chemical Innovation InstituteInventors: Masanao Kawabe, Masahide Murata, Toshio Kase, Hiroyuki Ozaki, Yoshifumi Fukui, The Ban Hoang, Jizhu Jin, Akira Miyazawa, Hideaki Hagihara, Kenji Tsuchihara, Yasuzo Suzuki, Michihiko Asai, Hisae Soga, Kazuo Soga
-
Publication number: 20040242790Abstract: A novel polyolefin graft copolymer prepared by graft-copolymerizing an olefin monomer with a (meth)acryl macromonomer or an isobutylene macromonomer in the presence of a coordination polymerization catalyst based on a late transition metal complex and a method for making the novel polyolefin graft copolymer are provided.Type: ApplicationFiled: February 20, 2004Publication date: December 2, 2004Inventor: Yoshifumi Fukui
-
Patent number: 6787617Abstract: A process for preparing olefinic living polymers having a molecular weight distribution (Mw/Mn) of 1 to 1.3, comprising polymerizing an olefinic monomer having 2 to 20 carbon atoms at low temperatures in the presence of a catalyst comprising (A) a hafnium or zirconium-containing compound having one or two cyclopentadienyl backbones, (B) a triphenyl boron compound or a tetraphenyl borate compound and optionally (C) a specific mono-, di- or trialkylaluminum compound. When the catalyst comprising the zirconium-containing compound is prepared by further using a titanium-containing compound (D), the polymerization temperature can be raised.Type: GrantFiled: November 8, 2001Date of Patent: September 7, 2004Assignees: Japan as represented by Director General of the Agency of Industrial Science and Technology, Japan Chemical Innovation InstituteInventors: Kazuo Soga, Takeshi Shiono, Michihiko Asai, Yasuzo Suzuki, Akira Miyazawa, Kenji Tsuchihara, Masahide Murata, Hiroyuki Ozaki, Masanao Kawabe, Toshio Kase, Jizhu Jin, Hideaki Hagiwara, Yoshifumi Fukui
-
Patent number: 6653430Abstract: A butadiene polymer (i) having a cis bond unit content of at least 50% based on the total butadiene units, a number average molecular weight (Mn) of 1,000 to 10,000,000, and at least 80%, based on the total molecular chains, of living chains containing a transition metal of group IV of the Periodic table at a terminal thereof; a polymer (ii) obtained by modifying terminals of the polymer (i); and a polymer (iii) obtained by coupling the polymers (i). These polymers (i), (ii) and (iii) are obtained by polymerizing a conjugated diene monomer alone or with a copolymerizable monomer at a specific temperature in the presence of a catalyst comprising a compound (A) of a transition metal of group IV of the periodic table having a cyclopentadienyl structure and a co-catalyst (B) selected from organoaluminum-oxy compound (a) and others and optionally further by contacting the resultant polymer with a terminal modifier or a coupling agent.Type: GrantFiled: June 18, 2001Date of Patent: November 25, 2003Assignees: Japan as Represented by Director General of the Agency of Industrial Science and Technology, Japan Chemical Innovation InstituteInventors: Kazuo Soga, Michihiko Asai, Yasuzo Suzuki, Akira Miyazawa, Kenji Tsuchihara, Masahide Murata, Hiroyuki Ozaki, Masanao Kawabe, Yoshifumi Fukui, Jizhy Jin, Hideaki Hagihara, Toshio Kase
-
Patent number: 6077878Abstract: The present invention relates to a foamed article comprising a modified polypropylene resin which is a graft copolymer of a polypropylene resin and an aromatic vinyl monomer and has an average number of the grafted aromatic vinyl chains of not less than 1 in one molecule of the graft copolymer and a weight average molecular weight of the grafted aromatic vinyl chains of not less than 200, and relates to a process for preparation thereof. According to the present invention, the foamed article comprising the polypropylene resin and having a high closed cell content, a high expansion ratio and good external appearance can be provided.Type: GrantFiled: December 17, 1997Date of Patent: June 20, 2000Assignee: Kanegafuchi Kagaku Kogyo Kabushiki KaishaInventors: Tetsuo Okura, Mitsuharu Kourogi, Yoshifumi Fukui, Hesun Kim, Haruo Tomita, Osamu Miyama, Taizo Aoyama