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To provide a fiber reinforced thermoplastic resin molded article having excellent impact strength and flexural strength, provided is a fiber reinforced thermoplastic resin molded article, including: a carbon fiber (A), an organic fiber (B) having a strand strength of 1500 MPa or more and, a thermoplastic resin (C), wherein the fiber reinforced thermoplastic resin molded article contains 5 to 45 parts by weight of the carbon fiber (A), 1 to 45 parts by weight of the organic fiber (B), and 20 to 94 parts by weight of the thermoplastic resin (C) with respect to 100 parts by weight of the total of the carbon fiber (A), the organic fiber (B), and the thermoplastic resin (C), wherein a ratio (Lco/lno) of the critical fiber length Lco of the organic fiber (B) to the number average fiber length lno of the organic fiber (B) is 0.9 or more and 2.0 or less, and wherein an interfacial shear strength between the organic fiber (B) and the thermoplastic resin (C) is 3.0 MPa or more and 50 MPa or less.

Titel:	Moldings of fiber-reinforced thermoplastic resin
Autor/in / Beteiligte Person:	TORAY INDUSTRIES, INC.
Link:	View record in USPTO Patent Grants (Volltext)
Veröffentlichung:	2021
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Grants Sprachen: English Patent Number: 11015,047 Publication Date: May 25, 2021 Appl. No: 16/638573 Application Filed: September 03, 2018 Assignees: TORAY INDUSTRIES, INC. (Tokyo, JP) Claim: 1. A fiber reinforced thermoplastic resin molded article, comprising: a carbon fiber (A), an organic fiber (B) having a strand strength of 1500 MPa or more and, a thermoplastic resin (C), wherein said fiber reinforced thermoplastic resin molded article contains 5 to 45 parts by weight of said carbon fiber (A), 1 to 45 parts by weight of said organic fiber (B), and 20 to 94 parts by weight of said thermoplastic resin (C) with respect to 100 parts by weight of the total of said carbon fiber (A), said organic fiber (B), and said thermoplastic resin (C), wherein a ratio (L co /l no) of the critical fiber length L co of said organic fiber (B) to the number average fiber length l no of said organic fiber (B) is 0.9 or more and 2.0 or less, and wherein an interfacial shear strength between said organic fiber (B) and said thermoplastic resin (C) is 3.0 MPa or more and 50 MPa or less. Claim: 2. The fiber reinforced thermoplastic resin molded article according to claim 1 , wherein said organic fiber (B) has a single fiber tenacity of 50 cN or more. Claim: 3. The fiber reinforced thermoplastic resin molded article according to claim 1 , wherein a ratio (L cc /L co) of the critical fiber length L cc of said carbon fiber (A) to the critical fiber length L co of said organic fiber (B) is 0.1 or more and 0.4 or less. Claim: 4. The fiber reinforced thermoplastic resin molded article according to claim 1 , wherein said organic fiber (B) is at least one selected from the group consisting of liquid crystalline polyester fibers, aramid fibers, and poly(paraphenylenebenzoxazole) fibers. Claim: 5. The fiber reinforced thermoplastic resin molded article according to claim 1 , wherein said thermoplastic resin (C) is at least one selected from the group consisting of polypropylene resins, polyester resins, and polyarylene sulfide resins. Claim: 6. The fiber reinforced thermoplastic resin molded article according to claim 1 , wherein said organic fiber (B) has a number average fiber length l no of 2000 m or more and 15000 m or less. Claim: 7. The fiber reinforced thermoplastic resin molded article according to claim 2 , wherein a ratio (L cc /L co) of the critical fiber length L cc of said carbon fiber (A) to the critical fiber length L co of said organic fiber (B) is 0.1 or more and 0.4 or less. Claim: 8. The fiber reinforced thermoplastic resin molded article according to claim 2 , wherein said organic fiber (B) is at least one selected from the group consisting of liquid crystalline polyester fibers, aramid fibers, and poly(paraphenylenebenzoxazole) fibers. Claim: 9. The fiber reinforced thermoplastic resin molded article according to claim 2 , wherein said thermoplastic resin (C) is at least one selected from the group consisting of polypropylene resins, polyester resins, and polyarylene sulfide resins. Claim: 10. The fiber reinforced thermoplastic resin molded article according to claim 2 , wherein said organic fiber (B) has a number average fiber length l no of 2000 μm or more and 15000 μm or less. Patent References Cited: 2006/0068141 March 2006 Tsutsumi et al. ; 2015/0291789 October 2015 Hirata et al. ; 2018/0305507 October 2018 Mitsutsuji et al. ; 2018/0312648 November 2018 Mitsutsuji et al. ; 6-285855 October 1994 ; 2006-124647 May 2006 ; 2014-62143 May 2006 ; 2009-24057 February 2009 ; 2009-114332 May 2009 ; 2013-14687 January 2013 ; 2015-143339 August 2015 ; 2015-178610 October 2015 ; 2016-74779 May 2016 ; WO 2014/098103 June 2014 ; WO 2017/073482 May 2017 ; WO 2017/073483 May 2017 ; WO 2019/031288 February 2019 Other References: International Search Report, issued in PCT/JP2018/032554, PCT/ISA/210, dated Dec. 4, 2018. cited by applicant ; Written Opinion of the International Searching Authority, issued in PCT/JP2018/032554, PCT/ISA/237, dated Dec. 4, 2018. cited by applicant Primary Examiner: Reuther, Arrie L Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch, LLP

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Moldings of fiber-reinforced thermoplastic resin