A kind of water-based coating liquid of polyester film base coat and polyester film

Abstract

The invention relates to a water-based coating liquid for a priming coat for polyester film use and the polyester film, and is particularly suitable for manufacturing various optical films. The water-based coating liquid comprises 3-20% of resin by weight percent, and 0.01-5% of nanoscale filling particle by weight percent, wherein the particle distribution range is between 60-150 nm; the resin comprises the following components: a) 20-90% of polyacrylic resin by weight percent, b) 5-50% of polyester resin by weight percent, and c) 5-30% of isocyanate resin by weight percent; and the total of the three components of a, b, and c is 100%. The polyester film has excellent optics performance, anti-adhesion ability, smoothness, and adhesive force, and satisfies the requirements for manufacturing various optical films.

Description

technical field [0001] The invention belongs to the field of polyester film manufacture, and in particular relates to an aqueous coating solution for a polyester film primer layer and a polyester film, and is especially suitable for manufacturing various optical films. Background technique [0002] Biaxially oriented polyester film (also called biaxially stretched polyester film) is not only widely used in packaging, printing, Window film, solar backplane and other products are also used to manufacture optical films such as anti-reflection film, prism film, diffusion film, and hardening film. Optical films not only require the above-mentioned excellent properties of the polyester film, but also require the polyester film to have excellent optical properties (including high transparency, low haze, etc.), anti-blocking, smoothness and optical grade Adhesion of acrylic resin coatings (generally mainly optical grade acrylic resins). In order to improve the above-mentioned char...

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Problems solved by technology

For example, the Chinese patent application number 200610111587.9 discloses a water-based coating solution for optical polyester film, the main components of which include polyester resin, acrylic resin, melamine resin, nano-scale filler particles, and silicone-based wetting agents. Polyester film has good optical properties, but the addition of silicone-based wetting agents may cause catalyst poisoning in the pores of the platinum catalyst plate

Another example is the U.S. Patent No. US6482501, which discloses a coating solution formulation for optical polyester film, whose components include water-based polyurethane, polyester resin and nano / submicron fine particles, and the coating solution formed by the formulation Although the adhesion and smoothness of the polyester film are effectively improved after being coated on the surface of the polyester film, since the fine particles contain a small amount of particles with a size of 20 microns, it is very easy to aggregate after coating and drying, which seriously affects The optical properties of the polyester film

Another example is that the Chinese patent application number 200410045143.0 also discloses a polyester film for optics, which includes particles with a diameter of 0.03-0.5 microns and 1-10 microns in the base layer of the film, but the particles of the base layer are also very prone to Aggregation, which makes the polyester film have a higher haze value, poor optical properties, and at the same time cause low coating flatness

[0004] Through the above, it can be found that the existing disclosed polyester film base coat water-based coating solution may have one or both of the excellent optical properties, anti-blocking properties, slipperiness and adhesion required for optical films. Improvements have been made, but new technical problems have arisen due to the formulation of the coating solution selected by itself, which has weakened other excellent characteristics required by optical films, so there is still a lack of suitable for the manufacture of various optical films. Polyester film

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