Marked composite material and method for producing the same

Patent metadata

Field	Value
Publication number	US-10507612-B2
Application number	US-201615260459-A
Country	US
Kind code	B2
Filing date	Sep 9, 2016
Priority date	Mar 11, 2014
Publication date	Dec 17, 2019
Grant date	Dec 17, 2019

Abstract

Disclosed is a composite material including a black pigment, carbon fibers, and a resin, wherein marking is applied with a laser having a wavelength of 100 to 2,000 nm on the composite material having 1) an area proportion of the carbon fibers in its topmost surface layer of 10 to 90%, 2) a proportion of the black pigment contained in the composite material of 0.2 to 20% by mass, and 3) an average fiber length of the carbon fibers of 1 mm or more.

First claim

The invention claimed is:

1. A method of applying laser marking on a composite material comprising a black pigment, carbon fibers, and a resin, and having the following 1) to 3):
1) an area proportion of the carbon fibers in a topmost surface layer of the material from 10 to 90%,
2) a proportion of the black pigment contained in the composite material from 0.2 to 20% by mass, and
3) an average fiber length of the carbon fibers from 1 to 100 mm,
wherein the laser marking is applied using a YVO 4 laser having a wavelength from 100 to 2,000 nm, an output density from 1.0 (mW/μm 2 ) to 30 (mW/μm 2 ), and an irradiation energy per pulse from 1000×10 −5 (mWs) to 50,000×10 −5 (mWs).

2. The method of applying laser marking according to claim 1 , wherein the wavelength is 300 to 600 nm.

3. The method of applying laser marking according to claim 1 , wherein the area proportion of the carbon fibers in the topmost surface layer is 20 to 60%.

4. The method of applying laser marking according to claim 1 , wherein the resin contained in the composite material is a thermoplastic resin.

5. The method of applying laser marking according to claim 1 , wherein a volume fraction (Vf) of the carbon fibers contained in the composite material is 10 to 65%.

6. The method of applying laser marking according to claim 1 , wherein the black pigment is carbon black.

7. The method of applying laser marking according to claim 1 , wherein the laser marking is applied using a laser having an output density from 3.0 (mW/μm 2 ) to 20 (mW/μm 2 ).

8. The method of applying laser marking according to claim 1 , wherein the wavelength is 1,000 to 1,200 nm.

9. The method of applying laser marking according to claim 1 , wherein the irradiation energy per pulse is from 1500×10 −5 (mWs) to 10,000×10 −5 (mWs).

10. The method of applying laser marking according to claim 1 , wherein the laser marking is applied using a laser beam having a beam diameter from 10 to 40 μm.

11. A method of producing a composite material having laser marking applied thereon by using the method of applying laser marking set forth in claim 1 .

12. The method of producing a composite material according to claim 11 , wherein the wavelength is 300 to 600 nm.

13. The method of producing a composite material according to claim 11 , wherein the area proportion of the carbon fibers in the topmost surface layer is 20 to 60%.

14. The method of producing a composite material according to claim 11 , wherein the resin contained in the composite material is a thermoplastic resin.

15. The method of producing a composite material according to claim 11 , wherein a volume fraction (Vf) of the carbon fibers contained in the composite material is 10 to 65%.

16. The method of producing a composite material according to claim 11 , wherein the black pigment is carbon black.

17. The method of producing a composite material according to claim 11 , wherein the wavelength is 1,000 to 1,200 nm.

Assignees

• Teijin Ltd

Inventors

• Koike Shuji
• Goto Takashi

Classifications

• B29K2105/0032

  Pigments, colouring agents or opacifiyng agents · CPC title

• C08J2377/02

  Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08J2377/10 takes precedence) · CPC title

• C08J5/042

  with carbon fibres · CPC title

• B29C59/16 Primary

  by wave energy or particle radiation {, e.g. infrared heating (B29C59/007 takes precedence)} · CPC title

• C08K2201/013

  Additives applied to the surface of polymers or polymer particles · CPC title