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Concentrated fluoroploymer dispersions

A dispersion, polymer technology, applied in polyether coatings, layered products, synthetic resin layered products, etc., can solve the problem of not realizing the important role of surfactant shear stability, and achieve high shear The effect of stability

Inactive Publication Date: 2005-05-04
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, prior art teachings fail to recognize the important role that surfactants may have on the shear stability of dispersion compositions

Method used

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  • Concentrated fluoroploymer dispersions
  • Concentrated fluoroploymer dispersions
  • Concentrated fluoroploymer dispersions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0087] Unless otherwise stated, solution concentrations are expressed in % by weight based on the total weight of solute and solvent water.

[0088] Preparation of polymer resin (core / shell)

[0089] A polymerization tank having a horizontal stirrer and a water capacity of 240 parts by weight was charged with 123.5 parts of demineralized water and 5.82 parts of paraffin wax supplied by Exxon. The contents of the polymerization kettle were heated to 65°C, and the polymerization kettle was evacuated and purged with tetrafluoroethylene (TFE). Into the evacuated polymerization kettle was charged 3.24 parts of a solution containing 0.0616 parts of ammonium perfluorooctanoate. The contents of the polymerization kettle were stirred at 50 rpm. The temperature was raised to 90°C. TFE was then added until the pressure was 2.72 MPa. Then 1.29 parts of fresh initiator solution of 0.01 parts of disuccinyl peroxide and 0.00005 parts of ammonium persulfate (APS) per part of water was add...

Embodiment 1

[0097] The base dispersion was concentrated hot using Leocol SC-90 available from Lion Corporation, Japan. The surfactant is a branched chain ethoxylate, represented by the general formula C 12 h 25 O(C 2 h 4 O) 9 H and C 14 h 29 O(C 2 h 4 O) 9 H indicates that it is formed from secondary alcohols. The surfactant is liquid at room temperature with a viscosity of 65 cps. After adjusting the solids to 60% and the surfactant to 6% on PTFE solids, the gel time was determined to be 850 seconds.

Embodiment 2

[0099] The base dispersion was thermally concentrated using Leocol TD-90 available from Lion Corporation, Japan. The surfactant is a branched chain ethoxylate, represented by the general formula C 13 h 27 O(C 2 h 4 O) 9 H indicates that it is formed from branched secondary alcohols. Pure surfactants are solids at room temperature. After adjusting the solids to 60% and the surfactant to 6% on PTFE solids, the gel time was determined to be 1241 seconds.

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Abstract

An aqueous dispersion composition of about 30 to about 70 weight % non-melt-processible fluoropolymer particles having a standard specific gravity (SSG) of less than 2.225 and about 2 to about 11 weight % surfactant based on the weight of said fluoropolymer comprising a compound or mixture of compounds of the formula: R(OCH2CH2)nOH wherein R is a branched alkyl, branched alkenyl, cycloalkyl, or cycloalkenyl hydrocarbon group having 8-18 carbon atoms and n is an average value of 5 to 18. The fluoropolymer particles of the dispersion comprise a core of high molecular weight polytetrafluoroethylene and a shell of lower molecular weight polytetrafluoroethylene or modified polytetrafluoroethylene. Preferably, the aqueous dispersion composition comprises about 45 to about 65 weight % non-melt-processible fluoropolymer particles.

Description

technical field [0001] This invention relates to dispersions of non-melt processible fluoropolymers and coatings formed from the dispersions. Background technique [0002] Fluoropolymers are used in a wide variety of substrates to provide properties such as release, chemical and heat resistance, corrosion protection, ease of decontamination, non-flammability and weatherability. Coatings of polytetrafluoroethylene (PTFE) homopolymers and modified PTFEs offer the highest thermal stability among fluoropolymers, but unlike tetrafluoroethylene (TFE) copolymers, they cannot be melt processed to form thin films and coating. Accordingly, other methods for coating PTFE homopolymers and modified PTFEs have been developed. One such method is dispersion coating, which applies the fluoropolymer in dispersion form. Dispersion coating methods typically use dispersions of such fluoropolymers, which are in a more concentrated form compared to dispersions obtained by polymerization. These...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B15/082B32B27/30C08F259/08C08K5/06C08L27/18C08L51/00C08L51/06C08L71/02C09D7/12C09D127/18C09D151/00C09D171/02C23C26/00D06M15/256
CPCC08F259/08C09D151/003C08K5/06C09D127/18C08L27/18C08L71/02C08L51/003C08L2205/02Y10T428/3154Y10T428/31544C08L2666/02
Inventor R·J·卡瓦诺C·W·琼斯K·科纳贝D·N·莱维P·A·F·托马斯T·A·特里特
Owner THE CHEMOURS CO FC LLC
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