Optical laminate
An optical laminate, polyamide-based technology, used in optics, optical components, nonlinear optics, etc., can solve the problems of easy-to-break and difficult-to-use front panel materials of flexible displays, and achieve the effect of excellent surface hardness
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[0182] The solvent used in the preparation of the polyamide-based resin varnish is not particularly limited as long as it can dissolve the polyamide-based resin. Examples of the solvent include amide-based solvents such as N,N-dimethylacetamide and N,N-dimethylformamide; lactone-based solvents such as γ-butyrolactone and γ-valerolactone; Sulfur-containing solvents such as dimethyl sulfone, dimethyl sulfoxide, and sulfolane; carbonate-based solvents such as ethylene carbonate and 1,2-propylene carbonate; and combinations thereof (mixed solvents). Among these solvents, an amide-based solvent or a lactone-based solvent is preferable. In addition, water, an alcohol-based solvent, a ketone-based solvent, an acyclic ester-based solvent, an ether-based solvent, and the like may be contained in the polyamide-based resin varnish.
[0183] Next, a polyamide-based resin varnish is applied to a base material such as a resin base material, a SUS tape, or a glass base material by a known c...
Embodiment 1
[0289] Polyamideimide A was diluted with DMAc to prepare a polyamideimide varnish having a concentration of 22% by mass. The DMAc solution of the ultraviolet absorber [2-(2-hydroxy-5-tert-octylphenyl)benzotriazole, "Sumisorb 340", manufactured by Sumika Chemical Co., Ltd.] was mixed therewith, followed by stirring for 30 minutes. The content of the ultraviolet absorber was made 5.5 parts by mass with respect to 100 parts by mass of polyamideimide A. Using an applicator, the obtained polyamide-imide varnish containing an ultraviolet absorber was applied to a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") so that the film thickness of the self-supporting film would be 55 μm. The smooth surface was dried at 50°C for 30 minutes, followed by drying at 140°C for 15 minutes, and then the obtained coating film was peeled off from the polyester substrate to obtain a self-supporting film. The self-supporting film was fixed to a metal frame, and was further d...
Embodiment 2
[0292] Polyamideimide B was diluted in a solution obtained by dissolving an ultraviolet absorber [Sumisorb 340, manufactured by Sumika Chemical Co., Ltd.] in a GBL solution to prepare a polyamideimide varnish having a concentration of 9.5% by mass. The content of the ultraviolet absorber was made 5.5 parts by mass with respect to 100 parts by mass of the polyamideimide B. Using an applicator, the obtained polyamide-imide varnish containing an ultraviolet absorber was applied to a polyester substrate (manufactured by Toyobo Co., Ltd., trade name "A4100") so that the film thickness of the self-supporting film would be 55 μm. The smooth surface was dried at 50°C for 30 minutes, followed by drying at 140°C for 15 minutes, and then the obtained coating film was peeled off from the polyester substrate to obtain a self-supporting film. The self-supporting film was fixed to the metal frame, and was further dried at 200° C. for 40 minutes in the atmosphere to obtain a polyamideimide fi...
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