HEAT-SENSITIVE RECORDING MATERIAL CONTAINING NON-PHENOLIC COLOUR DEVELOPERS Russian patent published in 2024 - IPC G03C5/30 B41M5/333 

FIELD: physics.

SUBSTANCE: proposed group of inventions relates to a heat-sensitive recording material, to a recording sheet made from a heat-sensitive recording material, and to a method of obtaining images using a heat-sensitive recording material. Heat-sensitive recording material contains a) a colour-forming compound selected from fluorans, b) a first non-phenol colour developer of formula (I) and c) a second non-phenol colour developer. In formula I

R and R₁ are all independently denote hydrogen; C₁-C₁₈-alkyl; C₁-C₈-alkoxy-C₁-C₈-alkyl; (R₉)₂N-C₁-C₈-alkyl, where R₉ denotes C₁-C₈-alkyl or C₅-C₆-cycloalkyl; or a radical of formula (II)

in which R₂, R₃, R₄, R₅, R₆ are all independently denote hydrogen; C₁-C₈-alkyl; -NH-C(=O)-R₇ or -C(=O)-NH-R₇, where R₇ denotes C₁-C₈-alkyl; -C(=O)OR₈, where R₈ denotes C₁-C₈-alkyl; halogen; or in which R₂ and R₃ or R₄ and R₅, or both, or in which R₃ and R₄ or R₅ and R₆, or both, or in which R₂ and R₃ or R₅ and R₆, or both, together denote a hydrocarbon diradical containing 3 or 4 carbon atoms, and in which Q denotes a single bond or C₁-C₈-alkylene, which can be branched or unbranched, and where C₁-C₈-alkylene includes a backbone chain containing one or more oxygen atoms located between two carbon atoms, if C₁-C₈-alkylene contains more than two carbon atoms.

EFFECT: development of a non-phenolic colour developer for use in heat-sensitive recording materials, which is a technically suitable and cost-effective alternative to existing phenol and non-phenol colour developers.

10 cl, 5 tbl, 9 ex