Patent US724264A successfully refreshed from Google Patents.
Patent US5496491A successfully refreshed from Google Patents.
US5496491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic stripping composition
Assignee: Ashland LLC
•
Filing: 1995-05-22
•
Granted: 1996-03-05
•
Expires: 2015-05-22
Abstract
Abstract Organic stripping composition for photoresists comprising organic polar solvents and basic amines which includes an inhibitor which forms a coordination complex with a metal.
Inventors
- 👤 Irl E. Ward
- 👤 Francis W. Michelotti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:33
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: 13
Claim 1
Independent Claim
122 words
In a stripping composition for photoresists wherein said stripping composition comprises an organic polar solvent and a basic amine, the improvement which comprises that said composition contains about 0.5 to 10% by weight of an inhibitor which is the dissolved salt reaction product of an alkanolamine and a reactant selected from the formula consisting of: ##STR6## wherein X represents C, O, N, or S, Y represents C, O, N, or S, R represents --OH, --NR"R", --SR", --NO, NO 2 or ##STR7## z is 0 or 1; R' represents --OH, --NR"R", --SR", --NO, NO 2 or ##STR8## G represents H, --OH and CO 2 R", lower alkyl or halo, R" represents H or lower alkyl, and R'" represents lower alkyl or lower alkoxy.
Claim 2
Dependent Claim
122 words
In a stripping composition for photoresists wherein said stripping composition comprises an organic polar solvent and a basic amine, the improvement which comprises that said composition contains about 0.5 to 10% by weight of an inhibitor which is the dissolved salt reaction product of an alkanolamine and a reactant selected from the formula consisting of: ##STR6## wherein X represents C, O, N, or S, Y represents C, O, N, or S, R represents --OH, --NR"R", --SR", --NO, NO 2 or ##STR7## z is 0 or 1; R' represents --OH, --NR"R", --SR", --NO, NO 2 or ##STR8## G represents H, --OH and CO 2 R", lower alkyl or halo, R" represents H or lower alkyl, and R'" represents lower alkyl or lower alkoxy.
Claim 3
Dependent Claim
22 words
The composition of claim 1 wherein said reactant is selected from the group consisting of: 8-amino-4H-chromene, 8-amino-4H-1-benzofuran, 1-hydroxy-8-dialkylaminonaphthalene anthranilic acid and, 1-hydroxy-8-dimethylaminonaphthalene.
Claim 4
Dependent Claim
25 words
The composition of claim 1 wherein said reactant is selected from the group consisting of: 8-hydroxy-4H-1-benzothiopyran, 8-hydroxy-4H-1-benzothiofuran, 8-methylthiochroman, 8-ditertbutylamino chromene, 1-tertbutoxy-8-nitronaphthalene, 8-alkylketoquinoline, 8-sulfhydrylquinoline, and 8-nitrosoquinoline.
Claim 5
Dependent Claim
7 words
The composition of claim 1 including water.
Claim 6
Dependent Claim
8 words
The composition of claim 1 which is non-aqueous.
Claim 7
Dependent Claim
16 words
The composition of claim 1 comprising about 50 to 98% by weight of said polar solvent.
Claim 8
Dependent Claim
15 words
The composition of claim 1 comprising about 1 to 49% by weight of said amine.
Claim 9
Dependent Claim
75 words
The composition of claim 1 wherein said organic polar solvent comprises an amide compound of the formula: ##STR9## and mixture thereof, wherein R is selected from the group consisting of hydrogen, lower alkyl and phenyl; R 1 and R 2 are selected from the group consisting of hydrogen and lower alkyl; and R and R 1 together with the keto and nitrogen group to which they are attached form a five or six membered ring.
Claim 10
Dependent Claim
27 words
The composition of claim 8 wherein said amide is selected from the group consisting of N, N-dimethyl acetamide, N-methyl acetamide, N, N-diethylacetamide, N, N-dimethylpropronamide, Nmethylpyrrolidinone, and N-ethyl-2-pyrrolidinone.
Claim 11
Dependent Claim
75 words
The composition of claim 1 wherein said amine comprises a compound of the formula: ##STR10## wherein R 3 is selected from the group consisting of --OH, --C 2 H 5 , --C 2 H 4 OH and --CH 2 CH(OH)CH 3 , R 4 is selected from the group consisting of hydrogen, alkanol and phenyl, and R 5 is selected from the group consisting of hydrogen, lower alkyl, alkanol and --C 2 H 4 OH.
Claim 12
Dependent Claim
27 words
The composition of claim 10 wherein said amine is selected from the group consisting of monoethanolamine, N-methyl aminoethanol, methylethylamine, morpholine, 1-amino-2-propanol, 2-(2-aminoethoxyethanol), 3-methoxypropylamine, 2-amino-picoline and bis (2-ethylhexyl)amine.
Claim 13
Dependent Claim
42 words
A process for removing a coating from a coated substrate comprising applying to said coated substrate a stripping effective amount of a stripping composition of claim 1, for a stripping effective period of time, and then removing the coating from the substrate.
References Cited (Backward Citations)
US3996147A
Cited
US4210552A
Cited
US4539230A
Cited
US4737195A
Cited
US4617251A
Cited
US4859418A
Cited
US5190723A
Cited
US5334332A
Cited
US5417877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-03-05 | 1999-09-04 | 2000-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-03-05 | 2003-09-04 | 2004-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-03-05 | 2007-09-04 | 2008-03-05 | $7700.00 | Window Closed / Lapsed |