COMPOSITION FOR MANUFACTURING HEAT-SENSITIVE PAPER Russian patent published in 2018 - IPC D21H11/10 

FIELD: chemistry.

SUBSTANCE: composition for manufacturing heat-sensitive paper contains a fibrous mixture of 60-80 wt % of cellulose and 20-40 wt % of a chemical-thermomechanical mass obtained by grinding the hardwood chips in two stages. Chemical processing of wood chips before the first stage of grinding is carried out in the presence of deresinator containing anionic, nonionic, cationic, and amphoteric surfactants and isopropyl alcohol with 0.10-0.15 wt % of the absolutely dry wood chips. Before the second stage of grinding, a chemical treatment is carried out in the presence of a deresinator containing anionic, nonionic, and amphoteric surfactants, as well as salts from the group consisting of phosphates, carbonates, silicates, and chelates at a rate of 0.05-0.09% of the absolutely dry wood chips.

EFFECT: replacement of a part of expensive cellulose with a modified bleached chemico-thermomechanical mass from hardwood is provided without loss of mechanical strength of paper.

2 cl, 1 tbl, 5 ex