Patents by Inventor Yoshiaki Kurimoto
Yoshiaki Kurimoto 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: 6242533Abstract: The present invention relates to a novolak type phenol resin, in particular a novolak type phenol resin for resists suitable for forming resist patterns. The novolak type phenol resin of the present invention is obtained by reacting at least a vinylphenol having a vinyl group and a phenolic hydroxyl group, such as parahydroxystyrene, or a polyvinylphenol, which is a polymer of the vinylphenol, a compound (A) such as 4,4′-methylenebis(2-hydroxymethyl-3,6-dimethylphenol) and/or a compound (B) such as 2,6-dihydroxymethyl-4-phenol, in a ratio of 1 to 40 moles of the compound (A) and/or compound (B) to 100 moles of the vinylphenol or 100 moles of structural unit of the vinylphenol contained in the polyvinylphenol in the presence of an acid and having a weight average molecular weight of 2,000 to 20,000. Such a novolak type phenol resin provides good pattern shape, heat resistance, resolution, and sensitivity in resists for lithography.Type: GrantFiled: May 31, 2000Date of Patent: June 5, 2001Assignee: Gun Ei Chemical Industry Co., Ltd.Inventors: Yoshiaki Kurimoto, Katsuhiro Maruyama, Akira Yoshitomo, Satoru Yoshida, Satoru Kitano
-
Patent number: 6211328Abstract: The present invention relates to a phenol resin, in particular a phenol resin for resists suitable for forming resist patterns. The phenol resin of the present invention is obtained by reacting at least two components, i.e., a compound (A) such as 4-hydroxymethyl-2,6-dimethylphenol and a polymerizable phenol compound such as parahydroxystyrene or a polymer (B), which is a polymer of the polymerizable phenol compound, in a ratio of 1 to 50 moles of the compound (A) to 100 moles of the polymerizable phenol compound or 100 moles of structural unit of the polymerizable phenol compound contained in the polymer (B) in the presence of an acid and having a molecular weight of 2,000 to 20,000. Such a phenol resin provides good pattern shape, heat resistance, resolution, and sensitivity in resists for lithography.Type: GrantFiled: June 1, 2000Date of Patent: April 3, 2001Assignee: Gun Ei Chemical Industry Co., LTDInventors: Yoshiaki Kurimoto, Katsuhiro Maruyama, Akira Yoshitomo, Satoru Yoshida, Satoru Kitano
-
Patent number: 6124420Abstract: This invention provides a novolak type epoxy resin which has low melt viscosity but shows high heat resistance when hardened. Particularly, it relates to a novolak type epoxy resin in which the relationship between the total % by weight of 3 to 6 nucleus bodies and the melt viscosity measured by a cone plate method at 150.degree. C. satisfies specified conditions, an epoxy resin composition containing the same and hardened products thereof.Type: GrantFiled: December 5, 1997Date of Patent: September 26, 2000Assignees: Nippon Kayaku Kabushiki Kaisha, Gun Ei Chemical Industry Co., Ltd.Inventors: Kenichi Kuboki, Yoshio Shimamura, Ryoichi Hasegawa, Yoshiaki Kurimoto, Akiyuki Kojima, Yukio Abe
-
Patent number: 6001949Abstract: One of the objects of the present invention is to offer novolak type phenolic resins which use phenols and aldehydes as raw materials and give narrow molecular weight distributions.The novolak type phenolic resins of the present invention are those obtained by condensation reaction of phenols with aldehydes in the presence of an oxycarboxylic acid having carboxyl groups, --COOH, and alcoholic hydroxyl groups, --OH, in one molecule. Thus obtained novolak type phenolic resins show narrow molecular weight distributions, lower viscosity in molten state and, as a consequence, uniformity in curing time.Type: GrantFiled: December 13, 1995Date of Patent: December 14, 1999Assignee: Gun Ei Chemical Industry Co., Ltd.Inventors: Yoshiaki Kurimoto, Akiyuki Kojima, Yukio Abe, Tsuyoshi Fukuda, Kaori Hasegawa
-
Patent number: 5929191Abstract: One of the objects of the present invention is to offer novolak type phenolic resins which use phenols and aldehydes as raw materials and give narrow molecular weight distributions.The novolak type phenolic resins of the present invention are those obtained by condensation reaction of phenols with aldehydes in the presence of an oxycarboxylic acid having carboxyl groups, --COOH, and alcoholic hydroxyl groups, --OH, in one molecule. Thus, obtained novolak type phenolic resins show narrow molecular weight distributions, lower viscosity in molten state and, as a consequence, uniformity in curing time.Type: GrantFiled: May 27, 1997Date of Patent: July 27, 1999Assignee: Gun Ei Chemical Industry Co., Ltd.Inventors: Yoshiaki Kurimoto, Akiyuki Kojima, Yukio Abe, Tsuyoshi Fukuda, Kaori Hasegawa
-
Patent number: 5859168Abstract: One of the objects of the present invention is to offer novolak type phenolic resins which use phenols and aldehydes as raw materials and give narrow molecular weight distributions.The novolak type phenolic resins of the present invention are those obtained by condensation reaction of phenols with aldehydes in the presence of an oxycarboxylic acid having carboxyl groups, --COOH, and alcoholic hydroxyl groups, --OH, in one molecule. Thus obtained novolak type phenolic resins show narrow molecular weight distributions, lower viscosity in molten state and, as a consequence, uniformity in curing time.Type: GrantFiled: November 22, 1996Date of Patent: January 12, 1999Assignee: Gun Ei Chemical Industry Co., Ltd.Inventors: Yoshiaki Kurimoto, Akiyuki Kojima, Yukio Abe, Tsuyoshi Fukuda, Kaori Hasegawa
-
Patent number: 5248451Abstract: The present invention provides a conductive copper composition comprising metal powder, a binder, a dispersant, and a solvent, characterized by containing 100 parts by weight of copper powder in the form of spherical or granule particles coated with silver as the metal powder, 6 to 18 parts by weight of resol resin satisfying the following conditions (a) to (c) as the binder, 0.05 to 1 part by weight of the dispersant, and 2 to 15 parts of the solvent:(a) Dimethylene-ether bonds in the skeletal structure or alkyl-ether bonds are contained 5% more of the bonded formaldehyde;(b) The molar ratio of preparation between formaldehyde and phenol (formaldehyde/phenol) is within the range of 1.0 to 3.Type: GrantFiled: July 9, 1991Date of Patent: September 28, 1993Assignees: Mitsui Mining & Smelting Co., Ltd., Gunei Chemical Industry Co., Ltd.Inventors: Masayuki Tsunaga, Takao Suzuki, Kazuaki Yuba, Yoshiaki Kurimoto, Kyoichi Gokan, Masaki Hirosawa
-
Patent number: 5045236Abstract: A copper conductive composition comprising 100 parts by weight of spherical copper powder coated with silver as metal powder, 6 to 18 parts by weight of resol type phenolic resin containing a dimethylene ether bond in bonded formaldehyde by 5% or more, the molar ratio between the formaldehyde thereof and phenol thereof (formaldehyde/phenol) being 1.0 to 3.0, 0.05 to 1 parts by weight of dispersant, and 2 to 15 parts by weight of solvent. Therefore, an excellent conductivity and solderability of the cured film can be obtained.Type: GrantFiled: November 14, 1989Date of Patent: September 3, 1991Assignees: Mitsui Mining & Smelting Co., Gunei Chemical Industry Co., Ltd.Inventors: Masayuki Tsunaga, Kazuaki Yuba, Yoshiaki Kurimoto, Maraki Hirosawa