White film and a method of manufacturing opaque white film

A technology of white, polyester resin, applied in the field of white film of oligomer extract

Active Publication Date: 2011-04-27
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, there is a problem that oligomers in the film are extracted due to a migration phenomenon when the temperature of the film is raised

Method used

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  • White film and a method of manufacturing opaque white film
  • White film and a method of manufacturing opaque white film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1) Preparation of polyester chips

[0077] Based on 100 parts by weight of terephthalic acid, 50 parts by weight of ethylene glycol was added to the esterification reactor, and then water was flowed out of the reactor by applying a pressure of 912 torr at 250° C. for 4 hours to carry out the esterification reaction , to prepare bis(2-hydroxyethyl) terephthalate. 300 ppm of antimony trioxide was added thereto as a polymerization catalyst, and condensation polymerization was performed by raising the temperature from 250°C to 285°C at 60°C / hr and lowering the pressure to 0.5 Torr. During the condensation polymerization reaction, 30 minutes before the stirring was carried out to the reaching point, the end-blocking agent 2,2-bisoxazoline (2,2-bisoxazolin) was added with 0.05wt%, and then when the desired stirring torque was reached When the reaction system was filled with nitrogen to return to normal pressure, the condensation polymerization reaction was completed, dischar...

Embodiment 2～5

[0086] A white film was prepared in the same manner as in Example 1, except that a masterbatch having the same physical properties prepared according to Table 1 below was used. The physical properties of the prepared white films were determined and are shown in Table 1 below.

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Abstract

Disclosed is a white film having low content of oligomer within the film and a method of manufacturing the opaque white film. The method comprises: solid-phase polymerizing a polyester resin to prepare the polyester resin having the intrinsic viscosity of 0.65-0.90 and the oligomer content of less than 0.5%; preparing masterbatch including 5-25 parts by weight of amorphous polyester resin and 50-150 parts by weight of barium sulfate, based on 100 parts by weight of polyester resin, and then solid-phase polymerizing the masterbatch to prepare the masterbatch having less than of 0.5% of oligomer content within polyester resin, 500-3,000 Poise of melt viscosity in the full range of Shear rate 100-5,000 l / s after melting at 280[deg.] C. for 5 minutes; mixing the polyester resin in the solid-phase polymerizing of the polyester resin with the masterbatch in the preparing and solid-phase polymerizing of the masterbatch, and then extruding it after melt-mixing to prepare a sheet; uniaxially drawing or biaxially drawing the prepared sheet; heat-treating the drawn film; and heat-setting the heat-treated film. The white film has excellent blare and whiteness and opaqueness and low content of extracted oligomer and not breakdown.

Description

technical field [0001] The present invention relates to a method for preparing an opaque white film, and more particularly, to a white film having excellent opacity and low content of oligomer extraction, which can be widely used in billboards, signs , labels, food packaging, beverage packaging and piping, as well as industrial laminates, insulation materials, backsheets for solar cells. Background technique [0002] Currently, paper, white plastic film, etc. are commonly used as substrates for labels, leaflets, cards, calendars, etc., and polyvinyl chloride, polyolefin, polystyrene, etc. are used as plastics. [0003] In general, polyolefin films containing inorganic fine particles have been frequently used as substrates as paper substitutes, however, polyolefin films have poor mechanical strength, poor heat resistance, poor weather resistance and poor dimensional stability, Therefore, its application is limited. Polyester films are now increasingly used as paper substitu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08L67/02C08K3/30C08G63/80C08J3/22B29C47/00B29C55/02B29C48/00B29C48/08B29C48/90
CPCB29C55/06C08J2367/02B29K2995/0072C08J5/18B29C47/00B29L2007/008C08J2467/00B29K2067/00B29C55/143C08J3/226C08G63/80B29C47/0057B29C47/0021B29C48/00B29C48/08B29C48/0018B29C48/914B29C48/90B29C48/906B29D7/01
Inventor 金度县宋起相赵诚浚
Owner KOLON IND INC
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