Laser light transmitting colored polyolefin resin compositions and process for laser welding

A method of laser welding comprising welding a portion of contact of a laser ray transmitting material comprising a laser ray transmitting colored polyolefin resin composition containing an anthraquinone salt forming dye represented by Formula (1) below and a red azo salt forming dye the anionic component of which corresponds to a red azo acid dye selected from the group consisting of the dyes as C.I. Acid Red 1, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 17, 18, 23, 24, 26, 27, 30, 33, 34, 35, 37, 40, 41, 54, 60, 66, 70, 73, 74, 88, 97, 102, 112, 115, 135, 137, 138, 141, 144, 148, 150, 151, 176, 231, and 266, the polyolefin resin composition containing 5 to 50% by weight of talc relative to said polyolefin resin, and a laser ray absorbing material by irradiating laser ray so that the laser ray transmitting material transmits the laser ray and the laser ray is absorbed in the laser ray absorbing material with the laser ray transmitting material and the laser ray absorbing material in contact with each other:

• in Formula (1),
• each of A and B independently represents —NH— or —O—,
• each of R1 to R3 independently represents hydrogen, an amino group, a hydroxy group or a halogen,
• each of R1 to R13 independently represents hydrogen, an alkyl group, a nitro group or a sulfonic group,
• Kin+ represents an organic ammonium ion,
• m represents 1 or 2, and
• n represents 1 or 2;
• the sulfonic group is —SO3 or SO3M, the number of —SO3 being m, M representing hydrogen or an alkali metal, and each of M may be identical or not provided that the number of SO3M is 2 or more.

A laser ray transmitting colored polyolefin resin composition containing an anthraquinone salt forming dye represented by Formula (1) below and a red azo salt forming dye the anionic component of which corresponds to a red azo acid dye selected from the group consisting of the dyes as C.I. Acid Red 1, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 17, 18, 23, 24, 26, 27, 30, 33, 34, 35, 37, 40, 41, 54, 60, 66, 70, 73, 74, 88, 97, 102, 112, 115, 135, 137, 138, 141, 144, 148, 150, 151, 176, 231, and 266, said polyolefin resin being a polyolefin elastomer:

• in Formula (1),
• each of A and B independently represents —NH— or —O—,
• each of R1 to R3 independently represents hydrogen, an amino group, a hydroxy group or a halogen,
• each of R1 to R13 independently represents hydrogen, an alkyl group, a nitro group or a sulfonic group,
• Kin+ represents an organic ammonium ion,
• m represents 1 or 2, and
• n represents 1 or 2;
• the sulfonic group is —SO3 or SO3M, the number of —SO3 being m, M representing hydrogen or an alkali metal, and each of M may be identical or not provided that the number of SO3M is 2 or more.

A method of laser welding comprising welding a portion of contact of a laser ray transmitting material comprising a laser ray transmitting colored polyolefin resin composition containing an anthraquinone salt forming dye represented by Formula (1) below and a red azo salt forming dye the anionic component of which corresponds to a red azo acid dye selected from the group consisting of the dyes as C.I. Acid Red 1, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 17, 18, 23, 24, 26, 27, 30, 33, 34, 35, 37, 40, 41, 54, 60, 66, 70, 73, 74, 88, 97, 102, 112, 115, 135, 137, 138, 141, 144, 148, 150, 151, 176, 231, and 266, said polyolefin resin being a polyolefin elastomer, and a laser ray absorbing material by irradiating laser ray so that the laser ray transmitting material transmits the laser ray and the laser ray is absorbed in the laser ray absorbing material with the laser ray transmitting material and the laser ray absorbing material in contact with each other:

• in Formula (1),
• each of A and B independently represents —NH— or —O—,
• each of R1 to R3 independently represents hydrogen, an amino group, a hydroxy group or a halogen,
• each of R4 to R13 independently represents hydrogen, an alkyl group, a nitro group or a sulfonic group,
• Kin+ represents an organic ammonium ion,
• m represents 1 or 2, and
• n represents 1 or 2;
• the sulfonic group is —SO3 or SO3M, the number of —SO3 being m, M representing hydrogen or an alkali metal, and each of M may be identical or not provided that the number of SO3M is 2 or more.

A method of laser welding comprising welding a portion of contact of a laser ray transmitting material comprising a laser ray transmitting colored polypropylene resin composition containing an anthraquinone salt forming dye represented by Formula (1) below and a red azo salt forming dye the anionic component of which corresponds to a red azo acid dye selected from the group consisting of the dyes as C.I. Acid Red 1, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 17, 18, 23, 24, 26, 27, 30, 33, 34, 35, 37, 40, 41, 54, 60, 66, 70, 73, 74, 88, 97, 102, 112, 115, 135, 137, 138, 141, 144, 148, 150, 151, 176, 231, and 266, the polypropylene resin composition containing 5 to 120% by weight of reinforcing glass fiber relative to said polypropylene resin, and a laser ray absorbing material by irradiating laser ray so that the laser ray transmitting material transmits the laser ray and the laser ray is absorbed in the laser ray absorbing material with the laser ray transmitting material and the laser ray absorbing material in contact with each other:

• in Formula (1),
• each of A and B independently represents —NH— or —O—,
• each of R1 to R3 independently represents hydrogen, an amino group, a hydroxy group or a halogen,
• each of R4 to R13 independently represents hydrogen, an alkyl group, a nitro group or a sulfonic group,
• Kin+ represents an organic ammonium ion,
• m represents 1 or 2, and
• n represents 1 or 2;
• the sulfonic group is —SO3 or SO3M, the number of —SO3 being m, M representing hydrogen or an alkali metal, and each of M may be identical or not provided that the number of SO3M is 2 or more.

A method of laser welding comprising welding a portion of contact of a laser ray transmitting material comprising a polyolefin resin composition containing an anthraquinone salt forming dye represented by Formula (1) below and a red azo salt forming dye the anionic component of which corresponds to a red azo acid dye selected from the group consisting of the dyes as C.I. Acid Red 1, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 17, 18, 23, 24, 26, 27, 30, 33, 34, 35, 37, 40, 41, 54, 60, 66, 70, 73, 74, 88, 97, 102, 112, 115, 135, 137, 138, 141, 144, 148, 150, 151, 176, 231, and 266, and a laser ray absorbing material comprising a laser ray absorbing colored resin composition incorporating carbon black and/or another laser absorbing colorant in a state that satisfies Formula (A) below by irradiating laser ray so that the laser ray transmitting material transmits the laser ray and the laser ray is absorbed in the laser ray absorbing material with the laser ray transmitting material and the laser ray absorbing material in contact with each other:

• in Formula (1),
• each of A and B independently represents —NH— or —O—,
• each of R1 to R3 independently represents hydrogen, an amino group, a hydroxy group or a halogen,
• each of R1 to R13 independently represents hydrogen, an alkyl group, a nitro group or a sulfonic group,
• Kin+ represents an organic ammonium ion,
• m represents 1 or 2, and
• n represents 1 or 2;
• the sulfonic group is —SO3 or SO3M, the number of —SO3 being m, M representing hydrogen or an alkali metal, and each of M may be identical or not provided that the number of SO3M is 2 or more;
• Q=P/(S·φ)>0.4 (A)
• where
• Q:
• amount of heat on surface of laser ray absorbing material (J/mm2)
• P:
• output (W) of laser that laser ray transmitting material transmits
• S:
• laser scanning speed (mm/sec)
• φ:
• spot diameter of laser (mm).

A laser ray transmitting colored polyolefin resin composition containing an anthraquinone salt forming dye represented by Formula (1) below and a red azo salt forming dye the anionic component of which corresponds to a red azo acid dye selected from the group consisting of the dyes as C.I. Acid Red 1, 3, 4, 5, 7, 8, 9, 10, 12, 13, 14, 17, 18, 23, 24, 26, 27, 30, 33, 34, 35, 37, 40, 41, 54, 60, 66, 70, 73, 74, 88, 97, 102, 112, 115, 135, 137, 138, 141, 144, 148, 150, 151, 176, 231, and 266, the polyolefin resin composition containing 10 to 60% by weight of reinforcing glass fiber relative to said polyolefin resin, said polyolefin resin being polypropylene resin:

• in Formula (1),
• each of A and B independently represents —NH— or —O—,
• each of R1 to R3 independently represents hydrogen, an amino group, a hydroxy group or a halogen,
• each of R4 to R13 independently represents hydrogen, an alkyl group, a nitro group or a sulfonic group,
• Kin+ represents an organic ammonium ion,
• m represents 1 or 2, and
• n represents 1 or 2;
• the sulfonic group is —SO3 or SO3M, the number of —SO3 being m, M representing hydrogen or an alkali metal, and each of M may be identical or not provided that the number of SO3M is 2 or more.