PREPREG AND FIBER-REINFORCED COMPOSITE MATERIAL

WIPO Patent Application WO/2021/006114

A1

The present invention provides a prepreg characterized by comprising the following constituent elements [A] to [E] and giving a cured object composed of a reinforcing-fiber layer lying from 8% to 92% in terms of thickness-direction depth from a surface and surface resin layers lying respectively from both surfaces to less than 8% in terms of thickness-direction depth, the reinforcing-fiber layer including both a first epoxy resin composition and 90 mass% or more of the constituent element [A] and the surface resin layers including both a second epoxy resin composition and 85 mass% or more of the constituent element [E]. [A] Carbon fibers [B] Epoxy resins comprising the following constituent elements [b1] and [b2]: [b1] a bi- or lower-functional epoxy resin having, in the molecule, at least one cyclic structure including four or more ring-forming members and having a glycidylamine group bonded to the cyclic structure; and [b2] a tri- or higher-functional epoxy resin [C] A thermoplastic resin having a weight-average molecular weight of 2,000-30,000 g/mol [D] Diaminodiphenyl sulfone [E] Particles having a volume-average particle diameter of 5-50 μm and insoluble in the constituent element [B]

JPH0729705	THERMOSENSITIVE POLYMER AND THERMOSENSITIVE ELEMENT
WO/2015/151515	MOLDED BODY AND METHOD FOR PRODUCING SAME

KOCHI SHINJI (JP)
KIDO DAISUKE (JP)
KOMORIYA AYA (JP)

PCT/JP2020/025662

January 14, 2021

June 30, 2020

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TORAY INDUSTRIES (JP)

C08K5/18; C08J5/24; C08K7/06; C08L63/00; C08L101/00

WO2019107457A1	2019-06-06
WO2019098243A1	2019-05-23
WO2016136052A1	2016-09-01

JP2010095557A	2010-04-30
JP2019077763A	2019-05-23
US5087657A	1992-02-11
JP2010229211A	2010-10-14
JPH09194611A	1997-07-29
JP2004506789W

See also references of EP 3995536A4

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