Polyester film and its preparation method
A technology of polyester film and polyester base film, which is applied in the direction of chemical instruments and methods, synthetic resin layered products, coatings, etc., and can solve the problems of product quality reduction, wrinkling, curling, etc.
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Embodiment 1
[0267] 1) Preparation of water dispersion resin composition (1)
[0268] (A) / ( B) = 40 / 60 adhesive as adhesive.
[0269] (A) The acrylic resin is a resin formed by copolymerizing 60 mol % of glycidyl acrylate and 40 mol % of vinyl propionate, and has a weight average molecular weight of 35,000.
[0270] (B) Water-dispersed polyester resins use 50 mol% of acid components (15 mol% of sulfonic acid terephthalate) relative to 50 mol% of diol components (50 mol% of diethylene glycol and 50 mol% of ethylene glycol). Formic acid and 85mol% terephthalic acid) copolymerized resin, the weight average molecular weight is 14000.
[0271] A binder with a solid content of 0.5 wt% and a silicone-based wetting agent (BYK348 of BYK CHEMIE) with a solid content of 0.3 wt% were added to water and stirred for 2 hours to prepare a water-dispersed resin composition with a total solid content of 0.8 wt%. (1).
[0272] The swelling ratio, gel fraction and Tg as described above were measured using...
Embodiment 2
[0277] 1) Preparation of water dispersion resin composition (2)
[0278] Using (A) a solid content weight ratio between an acrylic resin formed by copolymerizing a radically polymerizable unsaturated monomer containing a glycidyl group and (B) a water-dispersible polyester resin is (A) / ( B) = 70 / 30 adhesive as adhesive.
[0279] (A) The acrylic resin is a resin formed by copolymerization of 60 mol% glycidyl acrylate and 40 mol% vinyl propionate, and has a weight average molecular weight of 30,000.
[0280](B) Water-dispersed polyester resins use 50 mol% of acid components (15 mol% of sulfonic acid terephthalate) relative to 50 mol% of diol components (50 mol% of diethylene glycol and 50 mol% of ethylene glycol). The resin formed by copolymerization of formic acid and 85mol% terephthalic acid) has a weight average molecular weight of 12,000.
[0281] Solid content is 5wt% binder and 0.3wt% organosilicon wetting agent (BYK348 of BYK CHEMIE) is added in water, stirs 2 hours, th...
Embodiment 3
[0284] As the base layer (B), polyethylene terephthalate with an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2 wt%, and an oligomer content of 1.4 wt% was added to an extruder to melt extrude, as Surface layer (A) using a polyethylene terephthalate sheet prepared by solid-state polymerization with an intrinsic viscosity of 0.67, a diethylene glycol content of 0.7 wt% and an oligomer content of 0.5 wt%, and compared to A sheet extrudate cast as A / B / A 3 layers was prepared with 50 ppm of silica particles with a diameter of 0.7 μm based on the total polyethylene terephthalate weight. Thereafter, the water-dispersed resin composition (1) thus prepared was coated on both surfaces by a bar coating method, and then the temperature was raised to 110-150°C at 1°C per second, after preheating and drying , stretched on TD by a factor of 3.5. Thereafter, heat treatment was performed at 230° C. in a 5-pillar tenter, relaxation was performed by 10% in MD and TD at 200° C....
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