Quaternary ammonium hydroxides

A quaternary ammonium hydroxide, substance technology, applied in the direction of cationic surface active compounds, organic chemistry, detergent compositions, etc., can solve problems such as unsatisfactory compositions

Inactive Publication Date: 2016-03-16
SACHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the prior art compositions are unsatisfactory for various reasons

Method used

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  • Quaternary ammonium hydroxides
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preparation example Construction

[0142] Preparation of Exemplary Quaternary Ammonium Hydroxides

[0143] Synthetic routes to these compounds should be straightforward and obvious to anyone skilled in the art of organic synthesis. These methods include, but are not limited to (1) the reaction between tertiary amines and ethylene oxide, as exemplified by the industrial synthesis of choline hydroxide disclosed in U.S. Patent No. 2,774,759:

[0144]

[0145] or (2) by metathesis by quaternary ammonium halides:

[0146]

[0147] Or (3) by electrodialysis from quaternary ammonium halides.

[0148] These quaternary ammonium hydroxides are available in essentially dry form, but they are readily soluble in DA solvents without the use of protic co-solvents. Furthermore, as described herein, they are effective as a source of hydroxide in place of TMAH in formulations intended for use as strippers and cleaners.

Embodiment 1

[0150]

[0151] 59.06 grams of a 25% by weight solution of trimethylamine (0.250 moles of trimethylamine) in methanol were weighed into a polypropylene reaction vessel. To this solution was added 14.50 g of isopropyl glycidyl ether (0.125 mol) via syringe under a nitrogen atmosphere with vigorous stirring (Teflon-coated magnetic stir bar). A strong exotherm was noticed immediately after starting the addition of the glycidyl ether to the amine solution. With the aid of a syringe pump, the rate of addition was adjusted to keep the internal temperature below about 10 degrees Celsius above ambient. When the glycidyl ether addition was complete, the temperature began to decrease slowly. The solution was stirred for an additional 30 minutes, during which time the internal temperature dropped by approximately 4°C.

[0152] At this point, the internal temperature is still higher than the ambient temperature. Add the solution containing 6.76 g of H via a syringe at a rate such th...

Embodiment 2

[0155] The methanol solution obtained in a part of Example 1 (about 7.5 grams, containing 8.8 × 10 -3 Molar quaternary ammonium hydroxide) was evaporated to a viscous oil in a 50 mL polypropylene centrifuge tube under a stream of dry nitrogen. The test tube containing the viscous oil is placed in a vacuum chamber and heated at -2 mmHg was maintained for 5 hours during which time the viscous oil solidified as the last traces of solvent were removed.

[0156] Neat DMSO (12.84 g) was added to the tubes immediately after removal from the vacuum chamber, the caps were secured tightly and the contents of the tubes were stirred gently. After less than 5 minutes, all solids dissolved, resulting in a clear, colorless solution. Analysis of the solution by titration indicated 0.54 mol / kg of OH - concentration (target 0.58 mol / kg). The water content by Karl-Fischer titration was zero. The dry, concentrated solution was effective for removing novolac photoresist residue from wafer coup...

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Abstract

A method of removing a residue from a surface, including applying to the surface a composition including (a) a quaternary ammonium hydroxide having a general formula (I): as defined herein, and (b) a dipolar aprotic solvent substantially free of water; and removing at least a substantial portion of the residue from the surface.

Description

[0001] This application is a divisional application of the invention patent application with the application date of March 11, 2013, the application number: 201380016725.3, and the name: "quaternary ammonium hydroxide". technical field [0002] The present invention relates to novel quaternary ammonium compounds, particularly novel quaternary ammonium hydroxides, for use in strippers and cleaners, particularly in the semiconductor processing industry, but can be used in any industry where thorough cleaning of difficult-to-remove organic-type contaminants is required . Background technique [0003] Highly specialized organic polymers are used as surface coatings in electronic device fabrication in a variety of capacities. These polymer coatings can be permanent features of finished products, but they are more usually temporary coatings intended to act as protective and / or sacrificial barriers. For example, in the fabrication of logic devices, suitable reactive polymers, typi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D3/28C11D3/30C11D3/43C11D7/32C11D7/50C07C217/28C07D295/088
CPCC07C217/28C07D295/088C11D3/28C11D3/30C11D3/43C11D7/3209C11D7/3218C11D7/3227C11D7/3281C11D7/5004C11D1/62C07C2601/04C07D295/08C11D1/60C07C215/40
Inventor 查尔斯·B·利特尔
Owner SACHEM INC
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