Method of marking an article

摘要

PCT No. PCT/GB96/01175 Sec. 371 Date Apr. 1, 1998 Sec. 102(e) Date Apr. 1, 1998 PCT Filed May 17, 1996 PCT Pub. No. WO96/37369 PCT Pub. Date Nov. 28, 1996Laser marking compositions, articles of manufacture using same and methods of preparing said articles and compositions are disclosed which comprise a polymer including a cyclopentanone compound which is thermally stable at temperatures required to melt process polymers, but which will eliminate water when subjected to an excimer laser to form a visible mark comprising a cyclopentadienone.