Antiblocking parent stock for optical base film, and preparation method thereof

An anti-blocking masterbatch and anti-blocking agent technology, applied in the field of optical polyester film, can solve the problems of large difference in refractive index, no affinity, voids, etc., and achieve high light transmittance, easy realization, and simple process Effect

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
The aggregated large-sized particles and the voids formed by stretching will seriously affect the optical properties of the film and destroy the light transmission of the film
In addition, due to the large difference in refractive index between polyester and inorganic particles, the light transmittance of the film will decrease and the haze will increase.

Method used

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  • Antiblocking parent stock for optical base film, and preparation method thereof
  • Antiblocking parent stock for optical base film, and preparation method thereof
  • Antiblocking parent stock for optical base film, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] An anti-blocking masterbatch for an optical base film, comprising the following components by weight percentage:

[0025] 90% powdered PET resin (intrinsic viscosity is 0.68dL / g, chromaticity b value is 1);

[0026] 10% polystyrene cross-linked microspheres (average particle size 8μm, refractive index 1.59);

[0027] 1) At room temperature, add powdered PET resin and anti-blocking agent into a high-speed dispersion mixer at a speed of 800-1500 rpm and mix for 15-20 minutes to form a mixture;

[0028] 2) Dry the mixture at 170°C for 4 hours. After drying, the water content is ≤50ppm (determination of trace moisture by differential pressure method).

[0029] 3) Raise the twin-screw extruder to the temperature shown in Table 2, add the dried compound through the feeder of the twin-screw extruder, carry out melt extrusion, and cool and granulate.

[0030] Table 2 Extruder temperature settings

[0031]

[0032] 4) The masterbatch particles obtained in step 3) were drie...

Embodiment 2

[0034] An anti-blocking masterbatch for an optical base film, comprising the following components by weight percentage:

[0035] 90% powdered PET resin (intrinsic viscosity is 0.68dL / g, chromaticity b value is 1);

[0036] 10% polymethyl methacrylate cross-linked microspheres (average particle size 5 μm, refractive index 1.49);

[0037] Preparation method is the same as example 1.

Embodiment 3

[0039] An anti-blocking masterbatch for an optical base film, comprising the following components by weight percentage:

[0040] 90% powdered PET resin (intrinsic viscosity is 0.68dL / g, chromaticity b value is 1);

[0041] 6% polystyrene cross-linked microspheres (average particle size 6μm, refractive index 1.59);

[0042] 4% polymethyl methacrylate cross-linked microspheres (average particle size 5 μm, refractive index 1.49);

[0043] Preparation method is the same as example 1.

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Abstract

The invention belongs to the field of optical polyester films, and particularly relates to an antiblocking parent stock for optical base film, and a preparation method thereof, which can not influence on the optical performance of the film while improving the antiblocking property of the film. The antiblocking parent stock for optical base film comprises the following ingredients in percentage by weight: 90-99% of powder PET resin, and 1-10% of antiblocking agent. The antiblocking agent can not influence on the optical performance of the film while achieving the antiblocking property of the film. The closer the antiblocking agent and the refractive index of base body polyester are, the lower the refraction and diffuse reflection degree on a phase interface is, the light transmittance is high and the haze is low.

Description

technical field [0001] The invention belongs to the field of optical polyester films, and in particular relates to an anti-blocking masterbatch for optical base films and a preparation method thereof. Background technique [0002] In the production of BOPET optical base 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 fine pits, longitudinal stripes and other defects on the surface of the film, thus affecting The apparent quality of the film. [0003] In order to improve the anti-blocking property of the optical base film, a certain amount of anti-blocking agent needs to be added into the film. These anti-blocking agents form microspheres on the surface of the film and protrude on the surface of the film, so that an air layer is formed between the films. The existence of the air layer reduces the friction coefficient between the film and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L25/04C08L33/12C08J3/22B29C47/92B29C48/92
CPCB29C48/04B29C48/40B29C48/911
Inventor 茹正伟周涵俊
Owner CHANGZHOU BAIJIA NIANDAI FILM TECH CO LTD
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