| 摘要 |
<p>Recording material contains two or more recording elements which can form a clear, distinct colour on contact with one another, and at least one of elements is an encapsulated liquid, where capsule wall can be torn open by heat as well as by pressure. Capsule wall material is pref. formed by reacting a polyisocyanate with an acid anhydride, glycol, epoxy cpd. or polyamine, or a polyacid chloride with a polyamine. Ethylene/vinyl acetate or viny chloride/vinyl acetate copolymer, polyvinyl chloride, polyamide from HO2C(CH2)O(CH2)2CO2H and NH2(CH2)5NH2 or from HO2CCH2O-C6H4-OCH2COOH with NH2(CH2)3-O-C6H4-O-(CH2)3NH2, and polyesters can also be used.</p> |
