METHOD FOR PREPARING PAPER HAVING TRANSPARENT PORTIONS, AND PAPER HAVING TRANSPARENT PORTIONS PREPARED USING SAID METHOD

摘要

The invention relates to the pulp and paper industry, and specifically to the manufacture of paper for producing banknotes, checks, passports, identification documents, and other documents requiring counterfeit protection. The method includes locally impregnating portions of paper, said portions having certain shapes, using a solution of compounds with epoxy groups, and in the presence of a curing agent. According to the invention, the compounds with epoxy groups may be glycidyl ethers of monoatomic and polyatomic alcohols having a dynamic viscosity at a temperature of 25C of no more than 150 mPa·s. The technical result consists in producing transparent portions on paper without forming, on the surface of the paper, hard films which would hinder a subsequent printing process.