Bidirectional-stretching online-coating optical base film and its making method

A biaxial stretching and coating technology, applied in the field of optical films, can solve the problems of uneven dispersion of inorganic particles, increased haze, lack of affinity, etc. The effect of the process

Inactive Publication Date: 2013-06-26
CHANGZHOU BAIJIA NIANDAI FILM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the inorganic particles are easy to agglomerate, and there is not enough affinity between the polyester and the inorganic particles, the inorganic particles will be unevenly dispersed in the film and easily aggregated to form large-sized particles. Voids form around the ester
Aggregated large-sized particles and voids formed by stretching will seriously affect the optical properties of the film, resulting in reduced light transmittance and increased haze of the film

Method used

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  • Bidirectional-stretching online-coating optical base film and its making method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] By mass percentage: polyurethane polymer 30%, nano-sized colloidal silica 0.8%, micron-sized silica 0.4%, ethylene glycol monobutyl ether 1%, surfactant 0.03%, curing agent 9.4%, a small amount of acid The balance of alkali conditioning agent is pure water. Prepared as a coating solution for use.

[0023] Film preparation:

[0024] 1. Dry the core layer and surface layer PET raw materials (intrinsic viscosity is 0.68, chromaticity b value +1) at 170°C for 3.5 hours. Since polyester is prone to hydrolysis reaction at high temperature, it must be dried before use. The water content should be ≤45ppm (determination of trace moisture by differential pressure method);

[0025] 2. Send the core layer PET raw material into the twin-screw extruder for melting, and at the same time, send the surface layer PET raw material into another twin-screw extruder for melting, and the core layer melt and the surface layer melt are melted in the two extruders Extrusion, through the melt ...

Embodiment 2

[0031] By mass percentage: polyurethane polymer 30%, nano-sized colloidal silica 0.80%, micron-sized silica 0.20%, ethylene glycol monobutyl ether 1%, surfactant 0.03%, curing agent 9.4%, a small amount of acid The balance of alkali conditioning agent is pure water. Prepared as a coating solution for use.

[0032] The film preparation process is the same as in Example 1.

Embodiment 3

[0034] By mass percentage: polyurethane polymer 30%, nano-sized colloidal silica 1.00%, micron-sized silica 0.10%, ethylene glycol monobutyl ether 1%, surfactant 0.03%, curing agent 9.4%, a small amount of acid The balance of alkali conditioning agent is pure water. Prepared as a coating solution for use.

[0035] The film preparation process is the same as in Example 1.

[0036] Performance comparison:

[0037] The above example is compared with a film with a common thickness of 188 μm

[0038]

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Abstract

The invention relates to a bidirectional-stretching online-coating optical base film and its making method. The optical base film comprises a three-layer co-extruded bidirectional-stretching polyester film, and a coat having a thickness of 1-10mum and coated on at least one surface of the polyester film. The three-layer co-extruded polyester base film has an A / B / A structure and is formed by two co-extruded surface layers (the A layers) and a core layer (the B layer) positioned between the two surface layers. The coat adopts an aqueous polyurethane coating liquid, and includes a silica colloid having a particle size of 40-50mum, and micron-sized silica having a particle size of 1-6mum. The optical base film having the above structure has the characteristics of high light transmittance, low haze, good adhesion resistance and the like, and is suitable for the use in optical films comprising diffusion films, whitening films and protection films for the optical use.

Description

technical field [0001] The invention belongs to the field of optical films, in particular to a biaxially stretched on-line coated optical base film and a preparation method thereof. Background technique [0002] Biaxially oriented polyester film has excellent optical properties, good mechanical properties and heat resistance, and has been widely used in recent years. Biaxially oriented optical polyester film is widely used as an optical base film for LCD, CRT, PDP, EL and other displays due to its good dimensional stability, chemical resistance, high transparency and good processability compared to other plastic films. device field. [0003] In the production of polyester film, the smooth surface makes it easy to stick together when the film is rolled, which will cause difficulties in the subsequent cutting, packaging and deep processing, and will form defects such as fine pits and longitudinal stripes on the surface of the film, thus affecting the film. apparent quality. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/36B32B27/40B29C69/02B29C47/06B29C55/14B29C47/92B29C48/08B29C48/92
CPCB29C48/08
Inventor 茹正伟周涵俊
Owner CHANGZHOU BAIJIA NIANDAI FILM TECH CO LTD
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