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US4744834A
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Photoresist stripper comprising a pyrrolidinone, a diethylene glycol ether, a polyglycol and a quaternary ammonium hydroxide
Assignee: EMT PURCHASE CORP A CORP OF
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Filing: 1986-04-30
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Granted: 1988-05-17
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Expires: 2006-04-30
Abstract
Abstract A composition of matter is set forth which is useful for removing a photoresist material from a substrate. The composition comprises 10 to 90% by weight of a 2-pyrrolidinone compound of the formula ##STR1## 10 to 30% by weight of a diethylene glycol monalkyl ether of the formula HOCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 OR.sub.2 1 to 10% by weight of a polyglycol having a molecular weight from about 200 to about 600, and 0.5 to 4% of a quaternary ammonium hydroxide of the formula N.sup.+ R.sub.3 R.sub.4 R.sub.5 R.sub.6 OH.sup.- wherein R 1 is hydrogen, alkyl of 1 to 3 carbon atoms or hydroxyalkyl of 1 to 3 carbon atoms, R 2 , R 3 and R 4 are the same or different alkyl groups of 1 to 4 carbon atoms, R 5 is an alkyl group of 1 to 18 carbon atoms, and R 6 is an alkyl group of 1 to 18 carbon atoms, phenyl, alkylphenyl wherein the alkyl is of 1 to 18 carbon atoms, benzyl, or alkylbenzyl wherein the alkyl is of 1 to 18 carbon atoms.
Inventors
- 👤 Noor Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:43
CPC Classifications
C; C09; C09D; C09D9/00; C09D9/005; G; G03; G03F; G03F7/00; G03F7/26; G03F7/42; G03F7/422; G03F7/425
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
A composition of matter useful for removing a photoresist material from a substrate, comprising: 50 to 80% by weight of a 2-pyrrolidinone compound of the formula ##STR4## 15to 30% by weight of a diethylene glycol monoalkyl ether of the formula HOCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 OR.sub.2 1 to 10% by weight of a polyglycol having a molecular weight from about 200 to about 600; and 0.5 to 4% by weight of a quaternary ammonium hydroxide of the formula N.sup.+ R.sub.3 R.sub.4 R.sub.5 R.sub.6 OH.sup.- wherein R 1 is hydrogen, alkyl 1 to 3 carbon atoms or hydroxyalkyl of 1 to 3 carbon atoms, R 2 is alkyl of 1 to 4 carbon atoms, R 3 and R 4 are the same or different alkyl groups of 1 to 4 carbon atoms, R 5 is an alkyl group of 1 to 18 carbon atoms, and R 6 is an alkyl group of 1 to 18 carbon atoms, phenyl, alkyl phenyl wherein the alkyl is of 1 to 18 carbon atoms, benzyl, or alkylbenzyl where the alkyl is of 1 to 18 carbon atoms.
Claim 2
Dependent Claim
181 words
A composition of matter useful for removing a photoresist material from a substrate, comprising: 50 to 80% by weight of a 2-pyrrolidinone compound of the formula ##STR4## 15to 30% by weight of a diethylene glycol monoalkyl ether of the formula HOCH.sub.2 CH.sub.2 OCH.sub.2 CH.sub.2 OR.sub.2 1 to 10% by weight of a polyglycol having a molecular weight from about 200 to about 600; and 0.5 to 4% by weight of a quaternary ammonium hydroxide of the formula N.sup.+ R.sub.3 R.sub.4 R.sub.5 R.sub.6 OH.sup.- wherein R 1 is hydrogen, alkyl 1 to 3 carbon atoms or hydroxyalkyl of 1 to 3 carbon atoms, R 2 is alkyl of 1 to 4 carbon atoms, R 3 and R 4 are the same or different alkyl groups of 1 to 4 carbon atoms, R 5 is an alkyl group of 1 to 18 carbon atoms, and R 6 is an alkyl group of 1 to 18 carbon atoms, phenyl, alkyl phenyl wherein the alkyl is of 1 to 18 carbon atoms, benzyl, or alkylbenzyl where the alkyl is of 1 to 18 carbon atoms.
Claim 3
Dependent Claim
23 words
A composition as set forth in claim 1, wherein said quaternary ammonium hydroxide is in an amount of 1 to 2% by weight.
Claim 4
Dependent Claim
118 words
A composition of matter as set forth in claim 1, wherein said 2-pyrrolidinone compound is 2-pyrrolidinone, 1-methyl-2-pyrrolidinone, 1-ethyl-2-pyrrolidinone, 1-propyl-2-pyrrolidinone, 1-hydroxymethyl-2-pyrrolidinone, 1-hydroxyethyl-2-pyrrolidinone, or 1-hydroxypropyl-2-pyrrolidinone, said diethylene glycol monoalkyl ether is a monomethyl-, monoethyl-, or monobutyl- ether of diethylene glycol, said polyglycol is polyethylene glycol and said quaternary ammonium hydroxide is tetramethyl ammonium hydroxide, tetraethyl ammonium hydroxide, tetrabutyl ammonium hydroxide, benzyl trimethyl ammonium hydroxide, phenyl trimethyl ammonium hydroxide, dodecyl trimethyl ammonium hydroxide, hexadecyl trimethyl ammonium hydroxide, octadecyl trimethyl ammonium hydroxide, dodecyl triethyl ammonium hydroxide, hexadecyl triethyl ammonium hydroxide, octadecyl triethyl ammonium hydroxide, dodecyl tri-n-propyl ammonium hydroxide, docecyl tri-isopropyl ammonium hydroxide, benzyl dimethyl hexadecyl ammonium hydroxide, dimethyl ethyl hexadecyl ammonium hydroxide, p-dodecylbenzyl trimethyl ammonium hydroxide or benzyl dimethyl octadecyl ammonium hydroxide.
Claim 5
Dependent Claim
25 words
A composition of matter as set forth in claim 3, wherein said quaternary ammonium hydroxide is in an amount of 1 to 2% by weight.
Claim 6
Dependent Claim
61 words
A composition of matter as set forth in claim 3, wherein said 2-pyrrolidinone is in an amount of about 74% by weight, said diethylene glycol monoalkyl ether is in an amount of about 20% by weight, said polyglycol is in an amount of about 5% by weight, and said quaternary ammonium hydroxide is in an amount of about 1% by weight.
Claim 7
Dependent Claim
20 words
A method of removing a photoresist material from a substrate comprising contacting said substrate with the composition of claim 5.
Claim 8
Dependent Claim
20 words
A method of removing a photoresist material from a substrate comprising contacting said substrate with the composition of claim 4.
Claim 9
Dependent Claim
20 words
A method of removing a photoresist material from a substrate comprising contacting said substrate with the composition of claim 3.
Claim 10
Dependent Claim
20 words
A method of removing a photoresist material from a substrate comprising contacting said substrate with the composition of claim 2.
Claim 11
Dependent Claim
20 words
A method of removing a photoresist material from a substrate comprising contacting said substrate with the composition of claim 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-17 | 1991-11-16 | 1992-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-17 | 1995-11-16 | 1996-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-17 | 1999-11-16 | 2000-05-17 | $7700.00 | Window Closed / Lapsed |