Raychem Limited

Lawrence D Schwartz

Randolph W Chan

Richard E Rodkey

Philip Wallis

David Ryan

Kenneth M Winterstein

Permanent white indicia are applied to a polymeric surface, preferably of a black, heat-recoverable marker sleeve for wire or cable, using an ink composition comprising a pigment that is thermally stable at a temperature of at least about 350.degree. C., preferably titanium dioxide and a binder, such as nitrocellulose, and then heating the surface to permatize the mark. The marked article passes MIL-STD-202 in mark permanence.

Article having permanent indicia thereon

An article having a surface comprising an olefin polymer is marked with indicia using an ink comprising a binder capable of substantially complete cure at a temperature of about 100.degree. to 300.degree. C. for less than about 10 minutes and then heated to cure the binder. The indicia are permanent, e.g. are resistant to being rubbed off and are solvent resistant. Heat-recoverable marker sleeves having such permanent indicia are particularly useful for marking wires, e.g. in aircraft harnessing.

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Menlo Park, CA, United States of America

Lawrence D Schwartz