Raymond M Germonprez

41660447, Aug 28, 1979

May 30, 1978

5/910900

Raymond L. Germonprez - Neenah WI
Paul Zimmerman - Neenah WI

American Can Company - Greenwich CT

G01N 3122

252408

Binderless ink compositions suitable for use in jet printing operations on polymeric resin surfaces to form images which are highly resistant to abrasion and to steam pasteurization or sterilization conditions by penetration of the colorant into the sub-surface structure of the resin, are provided. The ink compositions are thermotropic, i. e. they change color in the presence of water or steam at elevated temperature and are useful as sterilization or pasteurization indicators. The preferred inks comprise either (1) a colorant which reacts under the sterilization conditions or (2) a combination of colorants one of which is extractible under sterilization conditions; a water and alcohol solvent system; a surfactant; an aliphatic or cyclic ketone, aldehyde, acetal, ether or ester and, optionally, an aliphatic hydrocarbon of 8-12 carbons.

41653998, Aug 21, 1979

Oct 10, 1978

5/950079

Raymond L. Germonprez - Neenah WI

American Can Company - Greenwich CT

C09D 1100

427264

Binderless ink compositions suitable for use in jet printing operations on polymeric resin surfaces to form images which are highly resistant to abrasion and to steam pasteurization conditions by virtue of penetration of the colorant into the sub-surface structure of the resin, in contrast to conventional ink images secured on the surface of a substrate by binders incorporated in the ink composition. The preferred inks contain a basic or neutral dye, a water and alcohol solvent system, a surfactant, an aliphatic ketone or ester and, as a preferred optional agreement, an aliphatic hydrocarbon of 8-12 carbons.