Abstract: A method of making a polarizing sheet and a related method of lamination are disclosed. The method of making a polarizing sheet includes steps of forming a surface-modified polarizer having carboxylic groups from a polyvinyl alcohol (PVA) film, and then performing a thermocompression lamination to laminate the polarizer with at least one protective film having hydroxyl groups on a surface thereof to form a polarizing sheet.

Abstract: A method of making a polarizer and a polarizing sheet is disclosed. The method of making a polarizer comprises providing a polyvinyl alcohol (PVA) film; dipping the PVA film into a first solution to perform a pre-treatment, wherein the first solution contains a carboxylic acid having at least two carboxyl groups or a derivative thereof and a catalyst catalyzing the reaction between the carboxylic acid and the surface of the PVA film; dipping the pretreated PVA film into a dye solution to perform a dyeing; dipping the dyed PVA film into a second solution while stretching the PVA film, wherein the second solution contains boric acid; and drying the stretched PVA film to form a polarizer.

Abstract: A method of making a polarizer includes providing a polyvinyl alcohol (PVA) film; dipping the PVA film into a dye solution for dyeing; dipping the PVA film into a first solution for pre-treatment; and dipping the pretreated PVA film into a second solution while stretching the PVA film. The first solution contains dicarboxylic acid and a catalyst for catalyzing the reaction between the dicarboxylic acid and the surface of the PVA film, and does not contain boric acid. The second solution contains boric acid.

Abstract: PVA-free hydrous glue for adhering a PVA film to a TAC film of a polarizing film is disclosed. The ingredients of the PVA-free hydrous glue include water, dicarboxylic acid, protonic acid, Lewis acid, and masking agent. The resultant polarizing film formed by employing the PVA-free hydrous glue has improved resistance to heat and moisture. Besides, the present invention PVA-free hydrous glue is easier to prepare and is more stable.

Abstract: This invention relates to a method of making a polarizing sheet or film. The invention starts with swelling an un-stretched PVA film in pure water. The swelled PVA film is dipped into an iodine-containing solution to adsorb iodine. The dyed PVA film is then dipped into a dicarboxylic acid-containing solution while uniaxially stretching the dyed PVA film. The dicarboxylic acid-containing solution further contains boric acid. The stretched PVA film is then laminated with etched TAC films. Just before the lamination of the stretched PVA film and the TAC films, a catalytic aqueous solution containing a strong protonic acid and a Lewis acid such as ZnCl2 is applied to the stretched PVA film.