Patent ID: 6825265
Filing Date: 2004-11-30
Classification: B41M,C01P,C08K,C09C,H01B,Y10T

Abstract:
A composition suitable for laser marking when exposed to radiation from an excimer laser, said composition comprising(1) a fluoropolymer having a processing temperature Tp, (2) 0.1 to 50% by weight of the composition of a colorless UV-absorbing pigment, and (3) a synergist having the formula [Rm(SiOn)]pRâ€²q, whereinâ€ƒ(a) m is 1 to 3, n is 1 to 3, p is at least 1, and q is 0 to 3, and â€ƒ(b) at least one R or Râ€² is a substituent that upon pyrolysis generates a black material suitable for providing a mark, â€ƒsaid synergist being (i) present at at least 10% by weight of the pigment present in the polymer composition, (ii) heat stable at a temperature of at least Tp, and (iii) in physical proximity with the pigment.