Process of transfer printing
AssigneeNippon Gohsei Kagaku Kogyo Kabushiki Kaisha
InventorsToshio Marui, Masuo Masuda
Life of this patent
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Abstract
In a process of transferring a pattern printed on a thin film of a polyvinyl alcohol resin to a surface of an object by pressing the object to the thin film floated on the surface of the water with the printed surface faced up and submerging the object into the water, boric acid or salts thereof are included in the thin film or in the water. A clear and precise pattern can be transferred to the object even if it has uneven surface.
Claims7
In a process of transferring a pattern printed on a thin film of a polyvinyl alcohol resin to a surface of an object by pressing the object to the thin film floated on the surface of water with the printed surface faced up and submerging the object into the water, the improvement which comprises incorporating boric acid or its salts selected from the group consisting of borax, anhydrous borax and borates other than sodium borate into said thin film of polyvinyl alcohol resin or into said water;
- said resin having an average degree of polymerization of 300 to 3,000 and an average degree of hydrolysis of 65% to 97% by mole;
- said boric acid or its salt being incorporated in said film in an amount of 0.02% to 10% by weight based on the polyvinyl alcohol resin or in the water in a concentration of 0.002% to 0.5% by weight.
Dependencies are inferred from the claim text.