Tempered glass for preventing generation of rainbow pattern and manufacturing method thereof

A manufacturing method of a tempered glass for preventing generation of a rainbow pattern, comprising the following steps:

• a) casting:
• subjecting a tempered glass layer A and an ultra-low phase-difference substrate layer B to double-layer co-extrusion to obtain a precursor film, wherein an extrusion thickness ratio of the tempered glass layer A to the ultra-low phase-difference substrate layer B is 80:10 to 60:20, and wherein the tempered glass layer A is made of hardened polyethylene terephthalate (PET) or hardened polycarbonate (PC) or hardened polymethyl methacrylate (PMMA) material, and the ultra-low phase-difference substrate layer B is made of super retardation film (SRF) or PC or PMMA or cyclo-olefin polymer (COP) material;
• b) heat treatment:
• subjecting the precursor film obtained in the step a to the heat treatment at 130° C. to 170° C. for 5 h to 8 h to obtain a heat-treated film;
• c) layer compounding:
• subjecting the heat-treated film obtained in the step b to the layer compounding at a layer compounding temperature of 60° C. to 100° C. to obtain a composite heat-treated film;
• and d) stretching:
• stretching the composite heat-treated film obtained in the step c at a stretching temperature of 120° C. to 155° C. and a stretching ratio of 1 to 3 to obtain a double-layer composite film.