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CN-122029461-A - Material for laser welding

CN122029461ACN 122029461 ACN122029461 ACN 122029461ACN-122029461-A

Abstract

The present invention provides a material for laser welding, comprising a resin and a cyanine compound represented by the following formula (1), wherein the cyanine compound has an average transmittance of 81% or more in the range of 380nm to 780nm when the transmittance of the maximum absorption wavelength is 10% in the range of 300nm to 1300 nm. [ in formula (1), L represents a methine chain having 3 or more and 9 or less carbon atoms, methine groups contained in the methine chain may each independently have a substituent, the substituents may be linked to each other, A + and A represent a group bonded to the methine chain L, and X ‑ represents a monovalent anion having a conjugated acid pKa of-8.0 or less ]

Inventors

  • Hisano Miyuki
  • AOKI MASANORI
  • OHNISHI TAKASHI

Assignees

  • 株式会社日本触媒

Dates

Publication Date
20260512
Application Date
20241107
Priority Date
20231121

Claims (9)

  1. 1.A material for laser welding comprising a resin and a cyanine compound represented by the following formula (1), [ Chemical formula 1] In the formula (1) of the formula (I), L represents a methine chain having 3 to 9 carbon atoms, each methine group contained in the methine chain may independently have a substituent, the substituents may be linked to each other, A + and A represent groups bonded to the methine chain L, X - represents a monovalent anion having a conjugate acid pKa of-8.0 or less ] The average transmittance of the cyanine compound in the wavelength range of 300nm to 460 nm is 81% or more in the wavelength range of 380nm to 780nm when the transmittance at the maximum absorption wavelength is 10%.
  2. 2. The material for laser welding according to claim 1, wherein the cyanine compound has a maximum absorption wavelength in a range of wavelengths 750nm to 1300 nm.
  3. 3. The material for laser welding according to claim 1, wherein the material for laser welding further comprises a solvent.
  4. 4. The material for laser welding according to claim 1, wherein the resin is a thermoplastic resin.
  5. 5. The material for laser welding according to claim 1, wherein the resin is a (meth) acrylic resin having a structural unit having a main chain with a ring structure, and the ring structure includes at least one selected from the group consisting of a lactone ring structure, a glutarimide structure, and a maleimide structure.
  6. 6. The material for laser welding according to claim 1, wherein in the formula (1), A + and A represent any one group represented by the following formulas (2) to (7), [ Chemical formula 2] In the formula (2) of the present invention, R 11 represents an organic group, and the organic group, R 12 ～R 17 each independently represents a hydrogen atom, a halogen atom or an organic group, * Represents the bonding site to the methine chain L of formula (1) [ Chemical formula 3] In the formula (3) of the present invention, R 21 represents an organic group, and the organic group, Ring S represents a hydrocarbon ring having a condensed ring structure which may have a substituent or a heterocyclic ring having a condensed ring structure which may have a substituent and is spiro-bonded to an adjacent pyrrole ring, Ring T represents an optionally substituted aromatic hydrocarbon ring, an optionally substituted aromatic heterocyclic ring, or a condensed ring containing these optionally substituted ring structures, * Represents the bonding site to the methine chain L of formula (1) [ Chemical formula 4] In the formula (4) of the present invention, R 31 represents an organic group, and the organic group, R 32 ～R 35 each independently represents a hydrogen atom, a halogen atom or an organic group, or R 32 and R 33 、R 33 and R 34 、R 34 and R 35 may be linked to each other to form a ring, Y 1 represents an oxygen atom, a sulfur atom, ch=ch or CR 36 R 37 ,R 36 , R 37 each represents an organic group, * Represents the bonding site to the methine chain L of formula (1) [ Chemical formula 5] In the formula (5) of the above, R 41 ～R 44 each independently represents a hydrogen atom, a halogen atom or an organic group, or R 41 and R 42 、R 43 and R 44 may be connected to each other to form a ring, Y 2 represents an oxygen atom, a sulfur atom or NR 45 ,R 45 represents an organic group, * Represents the bonding site to the methine chain L of formula (1) [ Chemical formula 6] In the formula (6) of the present invention, R 51 ～R 54 each independently represents a hydrogen atom, a halogen atom or an organic group, Y 3 represents an oxygen atom, a sulfur atom or NR 55 ,R 55 represents an organic group, * Represents the bonding site to the methine chain L of formula (1) [ Chemical formula 7] In the formula (7), R 61 ～R 63 、R 65 ～R 67 each independently represents a hydrogen atom, a halogen atom or an organic group, R 64 represents an organic group, and the organic group, * Represents a bonding site to the methine chain L of formula (1).
  7. 7. A laminate is provided with: A substrate, and A light absorbing layer provided on the base material and made of the material for laser welding according to any one of claims 1 to 6.
  8. 8. The laminate according to claim 7, wherein the average transmittance of the light absorbing layer in the wavelength range of 380nm to 780nm is 80% or more.
  9. 9. An absorbing material formed of the material for laser welding according to any one of claims 1 to 6.

Description

Material for laser welding Technical Field The present invention relates to a material for laser welding, and more particularly to a material for laser welding containing a resin and a cyanine compound. The present invention also provides a laminate having a light-absorbing layer formed of the laser welding material of the present invention, and an absorbing material formed of the laser welding material of the present invention. Background Laser welding is a joining method in which laser light is irradiated to weld members to each other. In laser welding, a transmitting material transmitting laser light and an absorbing material absorbing laser light are overlapped, and laser light is irradiated from the transmitting material side, whereby the transmitting material and the absorbing material are bonded. As the absorbing material, for example, a resin containing a coloring pigment such as carbon black or black dye is used, and by using such an absorbing material, energy of laser light can be efficiently absorbed by the absorbing material, and laser welding can be suitably performed. However, in this case, the colors of the transmissive material and the absorptive material are different, so that the joint between the transmissive material and the absorptive material becomes obvious, and the use of the welded body obtained by welding the transmissive material and the absorptive material may be limited. In contrast, patent document 1 discloses a laser welding material containing a specific squarylium (squarylium) compound as a laser-absorbing dye. According to the material for laser welding of patent document 1, transparent resins can be laser welded to each other, the invisibility is high, and the joint portion of the laser welding can be made inconspicuous. Prior art literature Patent literature Patent document 1 Japanese patent application laid-open No. 2019-11455 Disclosure of Invention Problems to be solved by the invention The material for laser welding is preferably a dye that absorbs laser light and has high visible light transparency, so that the material for laser welding can be easily aligned with the color of the member to be joined or can be formed in an arbitrary color, and the application range is wide. The present invention has been made in view of the above circumstances, and an object thereof is to provide a material for laser welding which is applicable to laser welding and which has high visible light transmittance of a dye absorbing laser light. The present invention also provides a laminate having a light-absorbing layer formed of the laser welding material of the present invention, and an absorbing material formed of the laser welding material of the present invention. Solution for solving the problem The material for laser welding, the laminate and the absorbent material according to the present invention, which can solve the above-described problems, are as follows. [1] A material for laser welding comprising a resin and a cyanine compound represented by the following formula (1), [ Chemical formula 1] In the formula (1) of the formula (I), L represents a methine chain having 3 to 9 carbon atoms, each methine group contained in the methine chain may independently have a substituent, the substituents may be linked to each other, A + and A represent groups bonded to the methine chain L, X - represents a monovalent anion having a conjugate acid pKa of-8.0 or less ] The average transmittance of the cyanine compound in the wavelength range of 300nm to 460 nm is 81% or more in the wavelength range of 380nm to 780nm when the transmittance at the maximum absorption wavelength is 10%. [2] The material for laser welding according to [1], wherein the cyanine compound has a maximum absorption wavelength in a range of wavelengths 750nm to 1300 nm. [3] The material for laser welding according to [1] or [2], which further contains a solvent. [4] The material for laser welding according to any one of [1] to [3], wherein the resin is a thermoplastic resin. [5] The material for laser welding according to any one of [1] to [4], wherein the resin is a (meth) acrylic resin comprising a structural unit having a main chain with a ring structure, and the ring structure comprises at least one selected from the group consisting of a lactone ring structure, a glutarimide structure and a maleimide structure. [6] The material for laser welding according to any one of [1] to [5], wherein A + and A in the formula (1) represent any one group represented by the following formulas (2) to (7). [ Chemical formula 2] [ In formula (2), R 11 represents an organic group, R 12～R17 each independently represents a hydrogen atom, a halogen atom or an organic group, [ represents a bonding site to the methine chain L of formula (1) ] [ Chemical formula 3] [ In formula (3), R 21 represents an organic group, ring S represents a hydrocarbon ring having a condensed ring structure which may have a substituent or a heterocyclic ring havi