LASER-SENSITIVE POLYMER COATINGS Russian patent published in 2014 - IPC C09D177/00 C09D7/12 B41M5/26 

FIELD: chemistry.

SUBSTANCE: invention relates to laser-sensitive polymer coatings for recording information with high resolution on hydrophilic and hydrophobic surfaces of substrates of a various chemical nature. A coating is made of a composition, which includes the following components: poly(o-hydroxyamide) as a polymer binding agent, sensitive to laser radiation, nigrosin dye as a laser-sensitive substance, an amide solvent. Poly(o-hydroxyamide) represents the product of polycondensation of isophthalic acid dichloride with 3,3'-dihydroxy-4,4'-diaminodiphenylmethane or isophthalic acid dichloride with mixture of 3,3'-dihydroxy-4,4'-diaminodiphenylmethane with bis-(3-aminopropyl)dimethylsiloxane, taken in a molar ratio from 10.0:1.0 to 1.0:10.0. The coating is obtained by application of the composition directly on a substrate surface without its preliminary dressing. After that, it is subjected to drying at 100-120°C for 15-30 min.

EFFECT: invention makes it possible to obtain coatings, stable in time, resistant to impact of vapours of HCl, H₂SO₄, HNO₃, petrol, alcohol, ammonia, water and withstanding thermocyclic loading from -50 to +200°C.