US 11,912,857 B2
Photocurable gasket resin composition for hard disk drive and hard disk drive
Taku Takeuchi, Kyoto (JP); Naoko Kashiwa, Kyoto (JP); and Arata Isai, Kyoto (JP)
Assigned to NIDEC CORPORATION, Kyoto (JP)
Filed by Nidec Corporation, Kyoto (JP)
Filed on Feb. 19, 2021, as Appl. No. 17/179,472.
Claims priority of application No. 2020-033783 (JP), filed on Feb. 28, 2020.
Prior Publication US 2021/0269632 A1, Sep. 2, 2021
Int. Cl. C08F 2/46 (2006.01); C08F 2/50 (2006.01); C08G 61/04 (2006.01); C08L 51/04 (2006.01)
CPC C08L 51/04 (2013.01) 7 Claims
 
1. A photocurable gasket resin composition for use in a hard disk drive, the photocurable gasket resin composition comprising:
an acryloyl-terminated polyisobutylene;
a monofunctional alkyl (meth)acrylate monomer;
a polyethylene powder;
a phosphate ester;
a polyfunctional secondary thiol;
a thixotropy-imparting agent; and
a photopolymerization initiator; wherein
the monofunctional alkyl (meth)acrylate monomer contains a chain skeleton alkyl (meth)acrylate of C8 to C18 and dicyclopentenyl acrylate; and
the thixotropy-imparting agent contains a compound derived from castor oil.