US 12,297,643 B2
Reinforcing material and reinforcing structure
Yuto Suzuki, Osaka (JP); and Takayuki Iwase, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 17/788,643
Filed by NITTO DENKO CORPORATION, Osaka (JP)
PCT Filed Oct. 15, 2020, PCT No. PCT/JP2020/038961
§ 371(c)(1), (2) Date Jun. 23, 2022,
PCT Pub. No. WO2021/131259, PCT Pub. Date Jul. 1, 2021.
Claims priority of application No. 2019-239145 (JP), filed on Dec. 27, 2019.
Prior Publication US 2023/0035852 A1, Feb. 2, 2023
Int. Cl. E04C 5/07 (2006.01); C08J 7/04 (2020.01)
CPC E04C 5/07 (2013.01) [C08J 7/042 (2013.01); C08J 2363/00 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A reinforcing material comprising:
a resin layer containing a thermosetting resin, a diene rubber, a tackifier resin, and a vulcanizing agent; and
a constraining layer disposed on the resin layer, wherein
a ratio of the diene rubber is less than 100 parts by mass with respect to 100 parts by mass of the thermosetting resin,
the thermosetting resin contains a first epoxy resin having an epoxy equivalent of more than 500 g/eq and a second epoxy resin other than the first epoxy resin,
60 parts by mass or more of the first epoxy resin is contained in 100 parts by mass of the thermosetting resin,
the tackifier resin has a softening temperature of 75° C. or more and 100° C. or less,
the tackifier resin has a bromine value of 30 gBr2/100 g or more, and
wherein a main chain of the first epoxy resin comprises acyclic aliphatic hydrocarbon components, and has a smaller number of ring structures than a main chain of the second epoxy resin.