Patent ID: 11390037

Abstract:
Regarding a laser welded body in which a laser transmissive/absorptive molding member containing a PBT-based material and a laser absorptive molding member containing a PBT-based material are integrated with each other by laser welding, the following laser welded body is proposed as a laser welded body in which a bond strength can be further increased. A laser welded body having a structure in which a member I and a member II are integrally bonded to each other, the member I contains 0.0005 to 5.0 parts by mass, with respect to 100 parts by mass of a polyester-based resin A, of a laser transmissive/absorptive coloring material capable of transmitting and absorbing laser beam, and the polyester-based resin A contains at least a polybutylene terephthalate copolymer resin, the member II contains 0.15 to 10.00 parts by mass, with respect to 100 parts by mass of a polyester-based resin B, of a laser absorptive coloring material not transmitting but capable of absorbing laser beam, and the polyester-based resin B contains (B1) a homo PBT, (B2) a homo PBT-based mixed resin containing a homo PBT, or (B3) a copolymerized PBT-based mixed resin containing a copolymerized PBT.