| abstract |
The laser beam penetrates the said laser beam transmitting material in the state which the laser beam transmissive colored polyolefin resin composition containing the following anthraquinone salt forming dye and the laser beam transmission material which consist of this resin composition and the laser beam absorbing material abut. A laser welding method characterized by welding the contact portion of the laser light transmitting material and the laser light absorbing material by irradiating the laser light so as to be absorbed by the laser light absorbing material:n n n n n n n n [A, B: -NH- or -O-; R 1 -R 3 : hydrogen, amino group, hydroxyl group, halogen; R 4 -R 13 : hydrogen, an alkyl group, a nitro group, a sulfone group; Ki n + : organic ammonium ion; m: 1 or 2; n: 1 or 2; Sulfone group is -SO 3 or SO 3 M, the number of -SO 3 is m, M is hydrogen or an alkali metal]. |