Importance

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Abstract

A thermal recording media has a base sheet, a thermal recording layer arranged on one side of the base sheet, and a back layer arranged on an opposite side of the base sheet. The back layer comprises a polyurethane having side chains derived from a fluorine-containing diol represented by the following formula (I): ##STR1## wherein R.sub.f represents a perfluoroalkyl or perfluoroalkenyl group having 1 to 20 carbon atoms; X represents a substituted or unsubstituted alkylene group having 1 to 10 carbon atoms, a substituted or unsubstituted alkenylene group represented by --CH.dbd.CH--(CH.sub.2).sub.n -- in which n stands for an integer of from 1 to 10, or ##STR2## in which n stands for an integer of from 0 to 6; Y represents a direct bond, --O--, --NH--, or --R.sub.0 --NH-- in which R.sub.0 is an alkylene group having 1 to 6 carbon atoms; Z represents a direct bond or --N(R')R--in which R is an alkylene group having 1 to 20 carbon atoms and R' is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms; R.sub.1 and R.sub.2 each independently represent a divalent organic group; and R.sub.3 represents a residual group of an aliphatic, alicyclic or aromatic diisocyanate.

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First Claim