# US 8,771,836 B2 · Resin composition and method for production thereof, and rolling bearing and sliding bearing > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,771,836 B2 - Document ID: US8771836B2 - Status: Granted - Kind: B2 - Application number: 13/388,048 - Filed: 2010-07-29 - Published: 2012-05-24 - Granted: 2014-07-08 - Earliest claimed: 2009-07-31 - Assignees: Ntn Corporation - Applicants: Yoshihide Himeno; Masaki Egami; Eiichirou Shimazu - Inventors: Yoshihide Himeno; Masaki Egami; Eiichirou Shimazu - Web page: https://patentgrep.com/patent/US8771836B2 ## CPC - C08L 67/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds (C08L67/06 takes precedence) - C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence) - C08L 77/06: Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) - F16C 33/201: {Composition of the plastic} - F16C 33/208: {Methods of manufacture, e.g. shaping, applying coatings} - F16C 33/416: {made from plastic, e.g. injection moulded comb cages} - F16C 33/7833: {Special methods of manufacture} - F16C 33/7853: {with one or more sealing lips to contact the inner race} - C08L 79/00: Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen or carbon only, not provided for in groups C08L61/00 - C08L77/00 - F16C 2208/02: comprising fillers, fibres - F16C 2208/60: Polyamides [PA] - F16C 2220/04: by injection-moulding - Y10T 428/31725: Of polyamide - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract It is an object of the present invention to provide a resin composition whose flowability is secured when the resin composition is injection-molded into injection-molded articles such as a resin-made crown-shaped cage and a resin-made seal both for a rolling bearing and a resin-made sliding bearing and which is capable of enhancing the mechanical strengths and toughnesses of these injection-molded articles to such an extent that these injection-molded articles can be used as bearing members. The resin composition is formed into a molded article and used as a bearing member. The resin composition is composed of polyamide resin or polyester resin to which polycarbodiimide is added. The polyamide resin is at least one resin selected from among polyamide 66 resin and polyamide 11 resin. The polyester resin is polytrimethylene terephthalate resin. 0.5 to 6 wt % of the polycarbodiimide is contained in an entirety of the resin composition. A resin-made crown-shaped cage (1) is obtained by injection-molding the resin composition. ## Claims ### Claim 1 A rolling bearing comprising an inner ring having a rolling surface on an outer surface thereof, an outer ring having a rolling surface on an inner surface thereof, a plurality of rolling elements interposed between said rolling surface of said inner ring and said rolling surface of said outer ring, and a crown-shaped resin cage holding a plurality of said rolling elements wherein said crown-shaped resin cage is an injection-molded article of a resin composition wherein said resin composition comprises either polyamide resin in combination with polycarbodiimide or polyester resin in combination with polycarbodiimide wherein said polyamide resin is at least one resin selected from the group consisting of polyamide 66 resin and polyamide 11 resin; said polyester resin is polytrimethylene terephthalate resin; and wherein said resin composition contains from 0.5 to 6 wt % of said polycarbodiimide based on the total weight of said resin composition. ### Claim 2 A rolling bearing comprising an inner ring having a rolling surface on an outer surface thereof, an outer ring having a rolling surface on an inner surface thereof, a plurality of rolling elements interposed between said rolling surface of said inner ring and said rolling surface of said outer ring, and a resin seal wherein said seal is a molded article of a resin composition wherein said resin composition comprises either polyamide resin in combination with polycarbodiimide or polyester resin in combination with polycarbodiimide wherein said polyamide resin is at least one resin selected from the group consisting of polyamide 66 resin and polyamide 11 resin; said polyester resin is polytrimethylene terephthalate resin; and wherein said resin composition contains form 0.5 to 6 wt % of said polycarbodiimide based on the total weight of said resin composition. ### Claim 3 A sliding bearing which is used for a machine part, said sliding bearing being a molded article of a resin composition wherein said resin composition comprises either polyamide resin in combination with polycarbodiimide or polyester resin in combination with polycarbodiimide wherein said polyamide resin is at least one resin selected from the group consisting of polyamide 66 resin and polyamide 11 resin; said polyester resin is polytrimethylene terephthalate resin; and wherein said resin composition contains from 0.5 to 6 wt % of said polycarbodiimide based on the total weight of said resin composition.