Patents by Inventor Kenkichi Yagi
Kenkichi Yagi 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: 4756947Abstract: Artificial leather and a dyeing method therefor; the leather includes ultrafine polyamide fibers and is particularly a grained artificial leather having bright, deep color, good color fastness to dry cleaning with charged soap, a delicate touch free from any undesirable rubber-like feeling, as well as high durability.A super-entangled fiber base is provided comprising ultrafine polyamide fibers and/or bundles thereof; polyurethane including polyoxyethylene of molecular weight of 500-5,000 is applied. The polyamide ultrafine fibers are dyed with a metal-dye complex and a fixing agent.Type: GrantFiled: July 9, 1986Date of Patent: July 12, 1988Assignee: Toray Industries, Inc.Inventors: Toshio Nishikawa, Shiro Imai, Kenkichi Yagi, Yuriko Yoshida, Masato Shimada, Junnosuke Nagashima, Teruo Nakamura
-
Patent number: 4620852Abstract: Artificial leather and a dyeing method therefor; the leather includes ultrafine polyamide fibers and is particularly a grained artificial leather having bright, deep color, good color fastness to dry cleaning with charged soap, a delicate touch free from any undesirable rubber-like feeling, as well as high durability.A super-entangled fiber base is provided comprising ultrafine polyamide fibers and/or bundles thereof; polyurethane including polyoxyethylene of molecular weight of 500-5,000 is applied. The polyamide ultrafine fibers are dyed with a metal-dye complex and a fixing agent.Type: GrantFiled: June 19, 1984Date of Patent: November 4, 1986Assignee: Toray Industries, Inc.Inventors: Toshio Nishikawa, Shiro Imai, Kenkichi Yagi, Yuriko Yoshida, Masato Shimada, Junnosuke Nagashima, Teruo Nakamura
-
Patent number: 4612228Abstract: An artificial grain leather sheet free of rubber-like elasticity and characterized by excellent softness and strength composed of ultrafine super-entangled synthetic fibers having a denier of less than about 0.5 and a resin. The sheet has a body portion and a grain surface portion wherein the ultrafine fibers are supertangled at a multiplicity of entangling points, with the average distance between entangling points being less than about 200 microns and the fiber density coefficient near the surface being greater than about 30.Type: GrantFiled: April 23, 1984Date of Patent: September 16, 1986Assignee: Toray Industries, Inc.Inventors: Hiroyasu Kato, Kenkichi Yagi
-
Patent number: 4519804Abstract: Melange-colored sheet and method. The sheet has an inner portion having ultrafine fiber bundles and/or multi-core fibers. The surface of the sheet is composed of super-entangled ultrafine fibers and/or fine bundles of ultrafine fibers of different colors, branched from the fibers of the inner portion, so that the surface presents a melange-colored effect of at least two colors.Type: GrantFiled: July 5, 1983Date of Patent: May 28, 1985Assignee: Toray Industries, Inc.Inventors: Hiroyasu Kato, Kenkichi Yagi, Miyoshi Okamoto
-
Patent number: 4476186Abstract: An entangled non-woven fabric having a fiber structure which comprises a portion (A) in which ultrafine fiber bundles consisting of ultrafine fibers of a size of not greater than about 0.5 denier are entangled with one another and a portion (B) in which ultrafine fibers to fine bundles of ultrafine fibers branch from the ultrafine fiber bundles and are entangled with one another, and in which portions (A) and (B) are nonuniformly distributed in the direction of fabric thickness. The product of this invention has high flexibility as well as good shape retention.The invention also relates to a grained sheet having on at least one of its surfaces a grain formed by a fiber structure composed of ultrafine fibers to fine bundles of ultrafine fibers and having a distance between the fiber entangling points of not greater than about 200 microns, and a resin in the gap portions of the fiber structure.Type: GrantFiled: March 29, 1983Date of Patent: October 9, 1984Assignee: Toray Industries, Inc.Inventors: Hiroyasu Kato, Kenkichi Yagi
-
Patent number: 4386127Abstract: A composite sheet material comprising a fibrous sheet which is impregnated and/or coated with a polyurethane elastomer, wherein said polyurethane elastomer comprises the reaction product of(A) a polymeric diol having a molecular weight of about 800-5000.(B) an organic polyisocyanate, and(C) a chain extender comprising a low molecular weight organic diol, and if desired,(D) a chain terminator; wherein more than 2 mol % of (C) and/or (D) comprise a hindered amine compound having the formula I ##STR1## wherein R.sup.1 is a substituent selected from the group consisting of hydrogen, oxygen, alkenyl, alkynyl, alkyl, aralkyl, acyl, --(R.sup.5 O).sub.n H and --(COR.sup.6 CO.sub.2 R.sup.7 O).sub.m --H, wherein R.sup.5 is an alkylene group, R.sup.6 is a residue of an organic dicarboxylic acid and R.sup.7 is a residue of an organic diol, n is an integer from 1 to 50 and m is an integer from 1 to 15;R.sup.Type: GrantFiled: May 1, 1981Date of Patent: May 31, 1983Assignee: Toray Industries, Inc.Inventors: Minoru Tanaka, Kenkichi Yagi
-
Patent number: 4302493Abstract: A composite sheet material comprising a fibrous sheet which is impregnated and/or coated with a polyurethane elastomer, wherein said polyurethane elastomer comprises the reaction product of(A) a polymeric diol having a molecular weight of about 800-5000,(B) an organic polyisocyanate, and(C) a chain extender comprising a low molecular weight organic diol, and if desired,(D) a chain terminator; wherein more than 2 mol % of (C) and/or (D) comprise a hindered amine compound having the formula I ##STR1## wherein R.sup.1 is a substituent selected from the group consisting of hydrogen, oxygen, an alkyl group containing 1-12 carbon atoms, an aralkyl group containing 7-18 carbon atoms, an acyl group containing 1-12 carbon atoms, --(R.sup.5 O).sub.n H and --(COR.sup.6 CO.sub.2 R.sup.7 O).sub.m --H, wherein R.sup.5 is an alkylene group containing 1-12 carbon atoms, R.sup.6 is a residue of an alkenyl group containing 2-12 carbon atoms, an organic dicarboxylic acid containing 2-12 carbon atoms, R.sup.Type: GrantFiled: February 20, 1980Date of Patent: November 24, 1981Assignee: Toray Industries, IncorporatedInventors: Minoru Tanaka, Kenkichi Yagi
-
Patent number: 4286014Abstract: A polyurethane elastomer which comprises a reaction product of (A) a polymeric diol having a molecular weight of about 800-5000, (B) a mixture of organic diisocyanates wherein about 2-70 mol % is composed of aliphatic diisocyanate (said aliphatic diisocyanate having no direct bond between an aromatic ring and an isocyanate group) and wherein the balance 98-30 mol % is composed of aromatic diisocyanate which includes a direct bond between an aromatic ring and an isocyanate group, and (C) a chain extender comprising hydrazine and/or a derivative having the formula NH.sub.2 NHR and another chain extender having two functional groups constituting amino and/or hydroxyl groups,and wherein about 30-80% of the carbon atoms which are bonded to nitrogen atoms constituting the ureylene and/or urethane bonds of said polyurethane elastomer constitute benzene and/or naphthalene ring skeletons.Type: GrantFiled: January 26, 1979Date of Patent: August 25, 1981Assignee: Toray Industries, IncorporatedInventors: Minoro Tanaka, Kenkichi Yagi, Kitao Shimizu
-
Patent number: 4212916Abstract: A composite material comprising a fibrous sheet which is impregnated with a polyurethane elastomer. The polyurethane elastomer comprises the reaction product of(A) a polymeric diol having a molecular weight of about 800-4000;(B) an organic diisocyanate having the formula (I) ##STR1## wherein R' and R.sup.2 are hydrogen or an alkyl group having 1-5 carbon atoms, respectively, and(C) a chain extender comprising an organic diamine having the formula (II) ##STR2## wherein R' and R.sup.2 are hydrogen or 40-95 mole % alkyl group having 1-5 carbon atoms, respectively, and a phthalic acid dihydrazide having the formula (III) ##STR3## This composite sheet material is useful as a synthetic leather, especially as a suede-like leather sheet material, and has high density, good flexiblity and crease resistance, a supple touch and 60-5 mole % pertinent rubber-like repulsive elasticity.Type: GrantFiled: January 19, 1979Date of Patent: July 15, 1980Assignee: Toray Industries, Inc.Inventors: Minoru Tanaka, Kenkichi Yagi, Shunji Mizuguchi