Laser markable white pigment composition
AssigneeBritish Aerospace Public Limited Company
InventorStewart W. Williams
Life of this patent
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Abstract
A laser markable white pigment composition includes a first pigment which is markable by ultraviolet laser, a second pigment, which is nonabsorbing in the ultraviolet region of the optical spectrum and which has a white appearance in the visible region of the optical spectrum, with the ratio of the amount of first pigment to amount of second pigment being in the range of from 4:1 to 1:10, so that the second pigment is present in an amount sufficient to increase the optical density, that is the whitening effect, of the composition, without adversely affecting the laser markability of the composition, and a carrier which is at least one fluoropolymer transparent in the ultraviolet region of the optical spectrum.
Claims8
A laser markable white pigment composition, which composition consists essentially of
- a first pigment which is markable by ultraviolet laser,
- a second pigment, which is nonabsorbing in the ultraviolet region of the optical spectrum and which has a white appearance in the visible region of the optical spectrum, with the ratio of the amount of first pigment to amount of second pigment being in the range of from 4:1 to 1:10, so that the second pigment is present in an amount sufficient to increase the optical density, that is the whitening effect, of the composition, without adversely affecting the laser markability of the composition, and
- a balance of the composition being a carrier which is at least one fluoropolymer transparent in the ultraviolet region of the optical spectrum.
Dependencies are inferred from the claim text.