Marked thermoplastic compositions, methods of making and articles comprising the same, and uses thereof

A method for generating a mark on an article, comprising:

• bonding a first component to a second component with a laser beam having a wavelength of greater than or equal to 800 nanometers, wherein the first component comprises a non-reflective thermoplastic material that can absorb light having a wavelength of less than or equal to 500 nanometers, and wherein the thermoplastic material has an initial L*,
• wherein the second component comprises a thermoplastic material that can absorb light having a wavelength of greater than or equal to 800 nanometers,
• contacting the first component with a second laser beam having a wavelength less than or equal to 500 nanometers to generate a mark, and
• wherein the mark results from increasing the reflectivity of the non-reflective thermoplastic material;
• wherein the mark has an increase in L* of greater than or equal to 20 compared to the initial L*;
• and
• wherein the thermoplastic material, in the form a plaque having a thickness of 1 millimeter, has a visible transmission of greater than 70% as measured according to ASTM D1003-00 using D65 illumination and 10 degrees observer.

A method of inscribing a substrate, comprising:

• contacting the substrate with a laser beam to generate a mark,
• wherein the laser beam has a wavelength less than or equal to 500 nanometers,
• wherein the mark results from increasing the reflectivity of a thermoplastic material, wherein the thermoplastic material, in the form a plaque having a thickness of 1 millimeter, has a percent transmission of less than or equal to 9% at the laser wavelength as measured according to ASTM D 1003-00 using D65 illumination and 10 degrees observer;
• wherein the substrate comprises a composition comprising the thermoplastic material capable of absorbing light having a wavelength of less than or equal to 500 nanometers;
• and
• wherein the thermoplastic material, at in the form a plaque having a thickness of 1 millimeter, has a visible transmission of greater than 70% as measured according to ASTM D 1003-00 using D65 illumination and 10 degrees observer.

A method of inscribing a substrate, comprising:

• contacting a front side of the substrate with a laser beam to generate a mark,
• wherein the laser beam has a wavelength less than or equal to 500 nanometers,
• wherein the mark results from increasing the reflectivity of a thermoplastic material, wherein the mark has a mark L* value measured from a back side of the substrate of greater than or equal to 46, and a delta L* value of less than or equal to 10, wherein the delta L* value is the difference in the mark L* value measured from the front side and the mark L* value measured from the back side;
• wherein the substrate comprises a composition comprising the thermoplastic material capable of absorbing light having a wavelength of less than or equal to 500 nanometers;
• and
• wherein the substrate thermoplastic material, at in the form a plaque having a thickness of 1 millimeter, has a visible transmission of greater than 70% as measured according to ASTM D 1003-00 using D65 illumination and 10 degrees observer.