Patents by Inventor Kengo Imamura
Kengo Imamura 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).
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Patent number: 11407925Abstract: An adhesive sheet of an embodiment of the present disclosure is an adhesive sheet including: a rigid resin film having a thickness of 80 micrometers to 500 micrometers, and a first pressure sensitive adhesive layer being disposed on or above a surface of the rigid resin film, wherein the first pressure sensitive adhesive layer includes elastic resin microspheres having a volume average particle diameter of 110 micrometers or greater and a tacky binder, and the first pressure sensitive adhesive layer has an uneven surface due to the presence of the microspheres.Type: GrantFiled: April 4, 2018Date of Patent: August 9, 2022Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventors: Hidetoshi Abe, Kengo Imamura, Katsuya Ono, Yoshihiko Takeda, Takeo Yamamoto
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Patent number: 11008487Abstract: A thermoset adhesive for bonding two materials having different linear expansion coefficients with reduced warping and without spaces being formed therebetween. The thermoset adhesive of the present invention comprises an epoxy resin, a core-shell rubber, thermally expansive microparticles, and a curing agent. The thermally expansive microparticles can have at least one or any combination of an average particle size of from 9 to 19 ?m, an expansion initiation temperature of from 70 to 100° C., and a maximum expansion temperature of from 110 to 135° C.Type: GrantFiled: January 22, 2019Date of Patent: May 18, 2021Assignee: 3M INNOVATIVE PROPERTIES COMPANYInventor: Kengo Imamura
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Publication number: 20210009863Abstract: An adhesive sheet of an embodiment of the present disclosure is an adhesive sheet including: a rigid resin film having a thickness of 80 micrometers to 500 micrometers, and a first pressure sensitive adhesive layer being disposed on or above a surface of the rigid resin film, wherein the first pressure sensitive adhesive layer includes elastic resin microspheres having a volume average particle diameter of 110 micrometers or greater and a tacky binder, and the first pressure sensitive adhesive layer has an uneven surface due to the presence of the microspheres.Type: ApplicationFiled: April 4, 2018Publication date: January 14, 2021Inventors: Hidetoshi Abe, Kengo Imamura, Katsuya Ono, Yoshihiko Takeda, Takeo Yamamoto
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Patent number: 10316225Abstract: A thermoset adhesive for bonding two materials having different linear expansion coefficients with reduced warping and without spaces being formed therebetween. The thermoset adhesive of the present invention comprises an epoxy resin, a core-shell rubber, thermally expansive microparticles, and a curing agent. The thermally expansive microparticles can have at least one or any combination of an average particle size of from 9 to 19 ?m, an expansion initiation temperature of from 70 to 100° C., and a maximum expansion temperature of from 110 to 135° C.Type: GrantFiled: November 5, 2013Date of Patent: June 11, 2019Assignee: 3M Innovative Properties CompanyInventor: Kengo Imamura
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Publication number: 20190153275Abstract: A thermoset adhesive for bonding two materials having different linear expansion coefficients with reduced warping and without spaces being formed therebetween. The thermoset adhesive of the present invention comprises an epoxy resin, a core-shell rubber, thermally expansive microparticles, and a curing agent. The thermally expansive microparticles can have at least one or any combination of an average particle size of from 9 to 19 ?m, an expansion initiation temperature of from 70 to 100° C., and a maximum expansion temperature of from 110 to 135° C.Type: ApplicationFiled: January 22, 2019Publication date: May 23, 2019Inventor: Kengo Imamura
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Publication number: 20150284607Abstract: A thermoset adhesive for bonding two materials having different linear expansion coefficients with reduced warping and without spaces being formed therebetween. The thermoset adhesive of the present invention comprises an epoxy resin, a core-shell rubber, thermally expansive microparticles, and a curing agent. The thermally expansive microparticles can have at least one or any combination of an average particle size of from 9 to 19 ?m, an expansion initiation temperature of from 70 to 100° C., and a maximum expansion temperature of from 110 to 135° C.Type: ApplicationFiled: November 5, 2013Publication date: October 8, 2015Applicant: 3M INNOVATIVE PROPERTIES COMPANYInventor: Kengo Imamura
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Patent number: 6792186Abstract: A light fiber comprising (a) a tubular clad having a predetermined length and (b) a solid core formed by reacting a filler material with which the clad is filled, the clad and the core being closely contacted with each other by shrinkage of the clad, characterized in that: the clad is expandable under pressure, shrinkage of the clad is initiated before the completion of the reaction of the filler material and is carried out in conformity with volume reduction of the core, which accompanies the reaction of the filler material, and the number of air gap between the clad and the core, which is measured per length of 10 m, is 3 or less.Type: GrantFiled: June 21, 2002Date of Patent: September 14, 2004Assignee: 3M Innovative Properties CompanyInventors: Kenji Matsumoto, Kengo Imamura, Shinichi Irie
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Patent number: 6776699Abstract: An abrasive pad for CMP has a substrate and an abrasive layer disposed on the substrate. An abrasive pad for CMP having a substrate and an abrasive layer disposed on the substrate, wherein said abrasive layer has a three-dimensional structure including a plurality of regularly arranged three-dimensional elements having a predetermined shape, and said abrasive layer comprises an abrasive composite containing advanced alumina abrasive grains produced by a CVD method and a binder as construction components.Type: GrantFiled: January 2, 2003Date of Patent: August 17, 2004Assignee: 3M Innovative Properties CompanyInventors: Takashi Amano, Toshihiko Watase, Kengo Imamura
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Publication number: 20040003895Abstract: An abrasive pad for CMP has a substrate and an abrasive layer disposed on the substrate. An abrasive pad for CMP having a substrate and an abrasive layer disposed on the substrate, wherein said abrasive layer has a three-dimensional structure including a plurality of regularly arranged three-dimensional elements having a predetermined shape, and said abrasive layer comprises an abrasive composite containing advanced alumina abrasive grains produced by a CVD method and a binder as construction components.Type: ApplicationFiled: January 2, 2003Publication date: January 8, 2004Inventors: Takashi Amano, Toshihiko Watase, Kengo Imamura
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Patent number: 6621977Abstract: An optical fiber comprising a core capable of transmitting light incident from one end in the lengthwise direction toward the other end, the core consisting of a polymer of a polymerizable stock material that contains a polymerizable hydroxy monomer with a hydroxyl group in the molecule, wherein the content of the polymerizable hydroxy monomer is 0.5 to 9 wt % with respect to the total of the polymerizable stock material, and the minimum dimension (R) in the direction orthogonal to the lengthwise direction of the core and the glass transition temperature (Tg) of the core have a relationship represented by the following Inequality 1:117/R+23<Tg<1050/R2+39 where the unit of R is mm, and the unit of Tg is ° C.Type: GrantFiled: July 9, 2002Date of Patent: September 16, 2003Assignee: 3M Innovative Properties CompanyInventors: Shinichi Irie, Kenji Matsumoto, Kengo Imamura
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Patent number: 6563993Abstract: A light fiber of directional side light extraction type capable of keeping the sectional shape as desired, reducing the undesirable light leakage to the outside through the light diffusive and reflective portion and extracting a highly directional and a highly bright light, and a process for manufacturing the same. Said object can be attained by co-extruding a resinous material only, and a material obtained by light scattering fine particles with a resinous material to disperse them therein so as to form a light diffusive and reflective film in a desired portion at least on the inner periphery of the clad.Type: GrantFiled: February 9, 2001Date of Patent: May 13, 2003Assignee: 3M Innovative Properties CompanyInventors: Kengo Imamura, Kenji Matsumoto, Shinichi Irie, Atsushi Udagawa
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Patent number: 6519401Abstract: To provide a side light extraction type light fiber capable of extracting light having high brightness at a viewing angle. Means for solving: a light fiber comprising: a core (1) in the center portion, and a cladding arranged around the core, characterized in that the cladding comprises: (i) a light diffusive layer (3) comprising a light diffusive portion made of a light diffusive material containing, as a binder, a polymer having a refractive index smaller than that of the core, which is provided in closely contact with the core in a wall thickness of 1 to 300 &mgr;m in a circumferential direction, and (ii) a protective layer (4) made of a light transmitting resin material, which is formed to integrate with the light diffusive layer and covers the light diffusive layer.Type: GrantFiled: April 27, 2001Date of Patent: February 11, 2003Assignee: 3M Innovative Properties CompanyInventors: Kengo Imamura, Kenji Matsumoto, Atsushi Udagawa, Shinichi Irie
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Publication number: 20030021576Abstract: An optical fiber comprising a core capable of transmitting light incident from one end in the lengthwise direction toward the other end, the core consisting of a polymer of a polymerizable stock material that contains a polymerizable hydroxy monomer with a hydroxyl group in the molecule, wherein the content of the polymerizable hydroxy monomer is 0.5 to 9 wt % with respect to the total of the polymerizable stock material, and the minimum dimension (R) in the direction orthogonal to the lengthwise direction of the core and the glass transition temperature (Tg) of the core have a relationship represented by the following Inequality 1:117/R+23<Tg<1050/R2+39 where the unit of R is mm, and the unit of Tg is ° C.Type: ApplicationFiled: July 9, 2002Publication date: January 30, 2003Inventors: Shinichi Irie, Kenji Matsumoto, Kengo Imamura
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Publication number: 20030002835Abstract: A light fiber comprising (a) a tubular clad having a predetermined length and (b) a solid core formed by reacting a filler material with which the clad is filled, the clad and the core being closely contacted with each other by shrinkage of the clad, characterized in that: the clad is expandable under pressure, shrinkage of the clad is initiated before the completion of the reaction of the filler material and is carried out in conformity with volume reduction of the core, which accompanies the reaction of the filler material, and the number of air gap between the clad and the core, which is measured per length of 10 m, is 3 or less.Type: ApplicationFiled: June 21, 2002Publication date: January 2, 2003Inventors: Kenji Matsumoto, Kengo Imamura, Shinichi Irie
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Patent number: 5783209Abstract: A medical pressure-sensitive adhesive is provided, having a high steam permeability (at least 1100 g/(m.sup.2 .multidot.24 Hr) at a temperature of 37.degree. C. and an RH of 40%), and exhibiting such an appropriate adhesive strength as the dressing material coated with the pressure-sensitive adhesive is not easily peeled off and a wound is not inflicted on the skin when the dressing material is peeled from the skin, and also exhibiting durability of such an appropriate adhesive strength as well as an appropriate cohesive force. A medical pressure-sensitive adhesive, comprising a polymer containing above 50 wt % of a unit derived from an alkoxyalkyl acrylate, the Tg value of the homopolymer thereof being -35.degree. C. or less is also provided.Type: GrantFiled: February 19, 1997Date of Patent: July 21, 1998Assignee: Minnesota Mining and Manufacturing CompanyInventors: Kengo Imamura, Hirofumi Sonoda, Yorinobu Takamatsu, Hiroyasu Nanakubo
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Patent number: 5663241Abstract: A removable pressure sensitive adhesive comprises pressure sensitive adhesive microparticles that are the polymerization product of a mono-olefinically unsaturated monomer having an aldehyde group or a ketone group, and a base monomer. By the addition of a polyhydrazide, other adhesives with improved properties can be provided.Type: GrantFiled: December 13, 1994Date of Patent: September 2, 1997Assignee: Minnesota Mining and Manufacturing CompanyInventors: Yorinobu Takamatsu, Kengo Imamura, Richard J. Goetz
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Patent number: 5578650Abstract: A one-step emulsification process for preparing aqueous suspensions of hollow, acrylate polymer microspheres conducted in the presence of at least one acid that is not free radically polymerizable. Surprisingly, the use of such an acid eliminates the previous requirement of using a polar copolymerizable monomer in the one-step emulsification process. The hollow acrylate polymer microspheres prepared from the process of the invention may be tacky or tack-free.Type: GrantFiled: December 1, 1995Date of Patent: November 26, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Joaquin Delgado, Kengo Imamura
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Patent number: 5562983Abstract: There is provided a disposable garment, such as a diaper, with a liquid additive, such as oil, containing microporous film and a pressure-sensitive adhesive fastening tab for releasably fastening to the microporous film. The pressure-sensitive adhesive comprises a copolymer of a) monoolefinically unsaturated monomer having an aldehyde group or ketone group and b) a base monomer.Type: GrantFiled: December 13, 1994Date of Patent: October 8, 1996Assignee: Minnesota Mining and Manufacturing CompanyInventors: Yasuhiro Kono, Yorinobu Takamatsu, Kengo Imamura
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Patent number: 5475070Abstract: To provide a water- and oil-repellent agent which, when it is used to treat natural fibers such as cotton and silk, does not damage the feeling of the fibers and does shown an excellent continuation property of water- and oil-repellency effect.A fluorine system water- and oil-repellent agent comprising, as a main component, units derived from a copolymer comprising polyfluoro-oxyalkyl-containing (meth)acrylate and units derived from a dicarboxylic acid anhydride-containing (meth)acrylate.Type: GrantFiled: October 27, 1994Date of Patent: December 12, 1995Assignee: Minnesota Mining and Manufacturing CompanyInventors: Masahiro Ashizawa, Kengo Imamura, Atsushi Udagawa, Makoto Nagase