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Leveling agent for color photoresist

A leveling agent and monomer technology, applied in the field of liquid crystal displays, can solve the problems of poor wetting of the molten photoresist material on the substrate, washing out of the leveling agent, etc., and achieve the effect of reducing roughness and improving fluidity

Active Publication Date: 2019-06-18
BEIJING ETERNAL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problem that Taper is out of specification because the leveling agent is easily washed away by the developer and the molten photoresist material does not wet the substrate well when the color filter is manufactured.

Method used

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  • Leveling agent for color photoresist
  • Leveling agent for color photoresist
  • Leveling agent for color photoresist

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0034] The present invention also relates to the preparation method of said leveling agent, comprising a polymerization reaction step and a post-treatment step,

[0035] Polymerization reaction step: use a four-necked flask as a reaction vessel, and connect a thermometer, a condenser (condensing reflux), a nitrogen inlet for protection, and a stirring paddle respectively. When synthesizing this leveling agent, benzoyl peroxide (BPO) or azobisisobutyronitrile (AIBN) is used as the initiator, and the stirring speed is 120-180rpm, and the solution of monomer, initiator, and chain transfer agent gradually turns to xylene Add dropwise for 1 to 2 hours. After the dropwise addition, continue to carry out solution polymerization in xylene at 60-80°C for 2-4 hours. The target molecular weight of the leveling agent in this technical proposal is preferably within 8000-10000, and the migration effect of the leveling agent will be deteriorated if the molecular weight is too large; dodecan...

Synthetic example 1

[0037] Synthesis example 1. Preparation of leveling agent A

[0038] Weigh 30 parts by weight of hexafluorobutyl acrylate, 30 parts by weight of styrene, 20 parts by weight of maleimide, 20 parts by weight of myrcene; and 6 parts by weight of initiator AIBN, 0.5 parts by weight of chain transfer agent dodecyl mercaptan, Dissolve in 100 parts by weight of xylene, mix well and place in a constant pressure funnel. In addition, 50 parts by weight of xylene was weighed and added into a four-neck flask, protected by nitrogen gas, heated to 65° C., and started to stir to 150 revolutions per minute (rpm).

[0039] Synthesis: Add the premixed monomer and initiator solution dropwise to xylene, and control the drop rate. The whole drop process takes 2 hours. After the drop is completed, keep stirring for 3 hours and add MEHQ 0.5 parts by weight to terminate the reaction.

[0040] Post-processing: use dropwise addition, after cooling the xylene solution obtained from the reaction to roo...

Synthetic example 2

[0042] Synthesis example 2. Preparation of leveling agent B

[0043] Use 40 parts by weight of hexafluorobutyl acrylate, 30 parts by weight of acrylonitrile, 15 parts by weight of maleimide, 15 parts by weight of undecene; and 7 parts by weight of initiator AIBN, 0.5 parts by weight of chain transfer agent dodecanethiol , dissolved in 100 parts by weight of xylene, mixed evenly and placed in a constant pressure funnel. In addition, 50 parts by weight of xylene was weighed and added into a four-neck flask, protected by nitrogen gas, the temperature was raised to 60° C., and the stirring was started to 150 rpm.

[0044]Synthesis: Add the premixed monomer and initiator solution dropwise to xylene, and control the drop rate. The whole drop process takes 1.5 hours. After the drop is completed, keep the temperature and continue to stir for 4 hours. Add 0.5 parts by weight of MEHQ terminated the reaction.

[0045] Post-processing: use dropwise addition, after cooling the xylene sol...

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Abstract

The invention provides a novel leveling agent, which is mainly prepared from the following monomers through polymerization: 20 to 40 weight parts of hexafluorobutyl acrylate, 20 to 40 weight parts ofmonomers with the glass transition temperature being higher than 100 DEG C, 10 to 20 weight parts of maleimide and 10 to 20 weight parts of long fat side chain monomers. After the photoresistance addition, the leveling agent is in a tiny particle suspension state, and is insoluble in common solvents of propylene glycol methyl ether acetate for the color photoresist; meanwhile, the solid state canbe maintained at a temperature not higher than 100 DEG C; the advanced migration to the photoresist surface in the front stage process is avoided. During post baking, the leveling agent is converted into a molten state to be slowly and outwards migrated to the surface of the photoresist the flowability of the photoresist is further improved; meanwhile, the leveling agent can obviously reduce the roughness of the surface of the photoresist material.

Description

technical field [0001] The invention belongs to the field of liquid crystal displays, and in particular relates to a novel leveling agent for color photoresists. Background technique [0002] The color filter is a key device for liquid crystal display to achieve colorization, and the performance of the color photoresist (also called photoresist) used to prepare the color filter directly affects the display effect of the liquid crystal display. The general preparation process of color filters includes glue coating-pre-baking-exposure-development-post-baking. Since the photoresist surface is cured better during the exposure process, it is easy to have a phenomenon that the upper part has a high degree of polymerization and the lower part has a low degree of polymerization. . In this way, an inverted trapezoidal structure tends to appear under the flushing action of developing. This inverted trapezoidal structure will collapse into a positive trapezoidal shape as the photores...

Claims

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Application Information

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IPC IPC(8): C08F220/24C08F212/08C08F222/40C08F220/18C08F220/44G03F7/004G03F7/00G03F7/40
Inventor 孙涛刘永祥桑伟
Owner BEIJING ETERNAL MATERIAL TECH