US4836950A
Expired / Lapsed
US
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Liquid for removing printing and screen printing inks: butyrolactone and/or N-methyl-2-pyrrolidone and propylene glycol derivative
Assignee: CPS KEMI APS A CORP OF DENMARK
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Filing: 1985-12-13
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Granted: 1989-06-06
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Expires: 2005-12-13
Abstract
Abstract PCT No. PCT/DK85/00119 Sec. 371 Date Sep. 18, 1986 Sec. 102(e) Date Sep. 18, 1986 PCT Filed Dec. 13, 1985 PCT Pub. No. WO86/03766 PCT Pub. Date Jul. 3, 1986.A liquid for removing printing and screen printing inks comprising an essentially anhydrous mixture containing: (a) q-butyrolactone and/or N-methyl-2-pyrrolidone in an amount of 1-25% (v/v); (b) one or more propylene glycol derivatives selected from substituted propyl acetates and/or propylene glycol ethers; and optionally (c) a diluent selected from aliphatic compounds having a flash point above 22 DEG C. and a content of aromatic compounds below 1%; and/or (d) a surfactant, the amount of components (b), (c) and (d) constituting 99-75% (v/v) of the liquid.
Inventors
- 👤 Claus H. Madsen
- 👤 Charles M. Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:32
CPC Classifications
C; C09; C09D; C09D9/00; B; B41; B41N; B41N3/00; B41N3/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
129 words
A liquid for removing printing and screen printing inks, characterized by consisting of an essentially anhydrous mixture comprising (a) γ-butyrolactone and/or N-methyl-2-pyrrolidone in an amount of 1-25% v/v) as well as (b) one or more propylene glycol derivatives selected from substituted propyl acetates of the formula ##STR5## wherein R is hydrogen or alkyl having from 1 to 6 carbon atoms, and/or propylene glycol ethers of the formula ##STR6## wherein R 1 is alkyl having from 1 to 6 carbon atoms, and n is 1, 2 or 3, and optionally (c) a diluent selected from aliphatic compounds having a flash point above 22° C. and a content of aromatic compounds below 1% and/or (d) a surfactant, the amount of components (b), (c) and (d) constituting 99-75% (v/v) of the liquid.
Claim 2
Dependent Claim
129 words
A liquid for removing printing and screen printing inks, characterized by consisting of an essentially anhydrous mixture comprising (a) γ-butyrolactone and/or N-methyl-2-pyrrolidone in an amount of 1-25% v/v) as well as (b) one or more propylene glycol derivatives selected from substituted propyl acetates of the formula ##STR5## wherein R is hydrogen or alkyl having from 1 to 6 carbon atoms, and/or propylene glycol ethers of the formula ##STR6## wherein R 1 is alkyl having from 1 to 6 carbon atoms, and n is 1, 2 or 3, and optionally (c) a diluent selected from aliphatic compounds having a flash point above 22° C. and a content of aromatic compounds below 1% and/or (d) a surfactant, the amount of components (b), (c) and (d) constituting 99-75% (v/v) of the liquid.
Claim 3
Dependent Claim
14 words
A liquid according to claim 1, characterized in that R is methyl or ethyl.
Claim 4
Dependent Claim
41 words
A liquid according to claim 1 or 2, characterized in that it contains as component (b) one or more propylene glycol ethers selected from propylene glycol monomethyl ether, propylene glycol monoethyl ether, dipropylene glycol monomethyl ether and tripropylene glycol monomethyl ether.
Claim 5
Dependent Claim
33 words
A liquid according to claim 3, characterized in that it contains as diluent one or more aliphatic hydrocarbons and/or an ether selected from butyl diglycol ether, ethyl diglycol ether and methyl diglycol ether.
Claim 6
Dependent Claim
13 words
A liquid according to, claim 4, characterized in that it contains a surfactant.
Claim 7
Dependent Claim
31 words
A liquid according to claim 1, characterized in that it consists of 1-25% of component (a) up to 99% of component (b) and 0-91% of component (c), optionally containing component (d).
Claim 8
Dependent Claim
24 words
A liquid according to claim 1, characterized in that the amount of components (c) and (d) together constitutes up to 50% of the mixture.
Claim 9
Dependent Claim
35 words
A liquid according to claim 1 or 2, characterized in that it contains as diluent one or more aliphatic hydrocarbons and/or an ether selected from butyl diglycol ether, ethyl diglycol ether and methyl diglycol ether.
Claim 10
Dependent Claim
13 words
A liquid according to claim 3 characterized in that it contains a surfactant.
Claim 11
Dependent Claim
19 words
A liquid according to claim 9, characterized in that the surfactant is in the form of a nonyphenol ethoxylate.
Claim 12
Dependent Claim
15 words
A liquid according to claim 1 or 2 characterized in that it contains a surfactant.
Claim 13
Dependent Claim
17 words
A liquid according to claim 1, characterized in that it contains about 10% (v/v) of component (a).
Claim 14
Dependent Claim
20 words
A liquid according to claim 1, characterized in that it contains a surfactant in the form of a nonylphenol ethoxylate.
References Cited (Backward Citations)
US2438038A
Cited
US3673099A
Cited
GB1586471A
Cited
GB1586472A
Cited
US4276186A
Cited
EP0081355A1
Cited
US4664721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-06-05 | 1992-12-05 | 1993-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-05 | 1996-12-05 | 1997-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-05 | 2000-12-05 | 2001-06-06 | $7700.00 | Window Closed / Lapsed |