US4737195A
Expired / Lapsed
US
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Activator-accelerator mixtures for alkaline paint stripper compositions
Assignee: Henkel Corp
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Filing: 1986-04-01
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Granted: 1988-04-12
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Expires: 2006-04-01
Abstract
Abstract An activator composition having increased effectiveness and life when used in an aqueous alkaline stripper solution at elevated temperatures to remove siccative coatings from substrates containing two essential components A and B. Component A consists essentially of at least one of an ethoxylated tetrahydrofurfuryl, a mixture of an ethoxylated tetrahydrofurfuryl and an ethoxylated furfuryl, N-methyl-2-pyrrolidone and N-(2-hydroxyethyl)-2-pyrrolidine. Component B consists essentially of at least one of N-phenyl-diethanolamine, furfurylamine, tetrahydrofurfurylamine, octadecylamine, butoxypropanolamine and N-amino-morpholine.
Inventors
- 👤 Carmen M. Carandang
- 👤 Robert W. Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:54
CPC Classifications
C; C09; C09D; C09D9/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
195 words
An aqueous activating composition to be added to an aqueous alkaline solution for the removal of coatings or finishes at elevated temperatures consisting essentially of: A. At least one of the following activator constituents (i) An ethoxylated compound of the formula R'O(CH 2 CH 2 O) n H wherein R' is tetrahydrofurfuryl and n is about 0.5 to 10; (ii) A mixture of the ethoxylated compound of the formula R'O(CH.sub.2 CH.sub.2 O).sub.n H wherein R' is tetrahydrofurfuryl and n is about 0.5 to about 10 and an ethoxylated compound of the formula R"O(CH.sub.2 CH.sub.2 O).sub.n H wherein R" is furfuryl and n is about 0.5 to about 10; wherein each of the activators is present in an amount of from about 0.1 to 20% by weight of the composition; and B. At least one of the following accelerator constituents (i) Furfurylamine, optionally in combination with N-phenyl-diethanolamine; (ii) Tetrahydrofurfurylamine, optionally in combination with N-phenyl-diethanolamine; wherein each of the accelerators is present in an amount from about 0.1 to 20% by weight of the composition; said constituents A and B being present in an amount sufficient to activate the aqueous alkaline solution when added to the solution.
Claim 2
Dependent Claim
195 words
An aqueous activating composition to be added to an aqueous alkaline solution for the removal of coatings or finishes at elevated temperatures consisting essentially of: A. At least one of the following activator constituents (i) An ethoxylated compound of the formula R'O(CH 2 CH 2 O) n H wherein R' is tetrahydrofurfuryl and n is about 0.5 to 10; (ii) A mixture of the ethoxylated compound of the formula R'O(CH.sub.2 CH.sub.2 O).sub.n H wherein R' is tetrahydrofurfuryl and n is about 0.5 to about 10 and an ethoxylated compound of the formula R"O(CH.sub.2 CH.sub.2 O).sub.n H wherein R" is furfuryl and n is about 0.5 to about 10; wherein each of the activators is present in an amount of from about 0.1 to 20% by weight of the composition; and B. At least one of the following accelerator constituents (i) Furfurylamine, optionally in combination with N-phenyl-diethanolamine; (ii) Tetrahydrofurfurylamine, optionally in combination with N-phenyl-diethanolamine; wherein each of the accelerators is present in an amount from about 0.1 to 20% by weight of the composition; said constituents A and B being present in an amount sufficient to activate the aqueous alkaline solution when added to the solution.
Claim 3
Dependent Claim
69 words
An activating composition according to claim 1 comprising at least one of a sequestering agent, a surfactant, a stabilizing agent and a coupling agent, wherein said sequestering agent is present in an amount of from about 0.1 to 20% by weight of the composition and said surfactant, stabilizing agents, and coupling agent are each present in an amount of from about 0.1 to 10% by weight of the composition.
Claim 4
Dependent Claim
28 words
An activating composition according to claim 1 wherein component A comprises 3 to 15% by weight, and component B comprises 2 to 15% by weight of the composition.
Claim 5
Dependent Claim
22 words
An activating composition according to claim 1 wherein in the component A R'O(CH.sub.2 CH.sub.2).sub.n H compound n is about 3 to 8.
Claim 6
Dependent Claim
23 words
An activating composition according to claim 1 wherein in the component A R'O(CH.sub.2 CH.sub.2 O).sub.n H compound n is about 0.5 to 1.5.
Claim 7
Dependent Claim
47 words
An activating composition according to claim 1 wherein Component A consists essentially of a mixture of R'O(CH.sub.2 CH.sub.2 O).sub.n H wherein R' is tetrahydrofurfuryl and n is about 3 to 8, and R"O(CH.sub.2 CH.sub.2 O).sub.n H wherein R" is furfuryl and n is about 0.5 to 1.5.
Claim 8
Dependent Claim
24 words
An activating composition according to claim 6 wherein Component B consists essentially of N-phenyl-diethanolamine in an amount of about 4 to 8% by weight.
Claim 9
Dependent Claim
53 words
An activating composition according to claim 6 wherein component A consists essentially of a mixture of compound R'O(CH 2 CH 2 O) n H in an amount of about 3 to 10% by weight, and compound R"O(CH 2 CH 2 O) n H in an amount of about 3 to 12% by weight.
Claim 10
Dependent Claim
29 words
An activating composition according to claim 1 wherein component A consists essentially of compound R'O(CH 2 CH 2 O) n H in an amount of about 15% by weight.
Claim 11
Dependent Claim
15 words
An activating composition according to claim 2 wherein the sequestering agent comprises a hydroxycarboxylic acid.
Claim 12
Dependent Claim
14 words
An activating composition according to claim 2 wherein the stabilizing agent comprises tetraethylene glycol.
Claim 13
Dependent Claim
29 words
An activating composition according to claim 2 comprising a coupling agent which is the monobutyl ether of diethylene glycol in an amount of about 0.1 to 10% by weight.
Claim 14
Dependent Claim
55 words
An activating composition according to claim 1 wherein component A consists essentially of a mixture of R'O(CH.sub.2 CH.sub.2 O).sub.n H wherein R' is tetrahydrofurfuryl and n is about 3 to 8; and R"O(CH.sub.2 CH.sub.2 O).sub.n H wherein R" is furfuryl and n is about 0.5 to 1.5; and at least one of N-methyl-2-pyrrolidone and N-(2-hydroxyethyl)-2-pyrrolidone.
Claim 15
Dependent Claim
30 words
An activating composition according to claim 1 wherein component B consists essentially of at least one of Furfurylamine Tetrahydrofurfurylamine; each in an amount of about 2 to 15% by weight.
Claim 16
Dependent Claim
40 words
An activating composition according to claim 14 wherein component B consists essentially of at least one of Furfurylamine in an amount of about 4 to 8% by weight, and Tetrahydrofurfurylamine in an amount of about 4 to 8% by weight.
Claim 17
Dependent Claim
64 words
An activating composition according to claim 15 comprising at least one of a sequestering agent, a surfactant and a stabilizing agent wherein said sequestering agent is present in an amount of from about 0.1 to 20% by weight of the composition and said surfactant and stabilizing agents are each present in an amount of from about 0.1 to 10% by weight of the composition.
Claim 18
Dependent Claim
25 words
An activating composition according to claim 16 wherein the sequestering agent comprises a hydroxycarboxylic acid in an amount of about 2 to 10% by weight.
Claim 19
Dependent Claim
24 words
An activating composition according to claim 16 wherein the surfactant comprises sodium butoxyethoxy acetate in an amount of about 1 to 5% by weight.
Claim 20
Dependent Claim
41 words
An activating composition according to claim 16 wherein the stabilizing agent comprises at least one of thiodiethylene glycol in an amount of about 2 to 12% by weight and tetraethylene glycol in an amount of about 2 to 12% by weight.
Claim 21
Dependent Claim
56 words
An aqueous alkaline solution for removing a siccative coating from a substrate coated therewith at an elevated temperature comprising I about 2 to about 5 volumes of the composition of claim 1, and II about 10 volumes of an aqueous alkaline solution containing from about 10 to about 50% by weight of an alkali metal hydroxide.
Claim 22
Dependent Claim
35 words
An activating composition according to claim 20, wherein the alkali metal hydroxide is sodium hydroxide, potasium hydroxide or mixtures thereof and the concentration of the alkali metal hydroxide is about 45 to 50% by weight.
Claim 23
Dependent Claim
55 words
A method of removing a siccative coating from a substrate coated therewith comprising the steps of (1) contacting said coated substrate with an effective quantity of the composition of claim 6 at an elevated temperature until the siccative coating is removed from the coated substrate; and (2) removing the substrate from contact with the composition.
Claim 24
Dependent Claim
55 words
A method of removing a siccative coating from a substrate coated therewith comprising the steps of (1) contacting said coated substrate with an effective quantity of the composition of claim 13 at an elevated temperature until the siccative coating is removed from the coated substrate; and (2) removing the substrate from contact with the composition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-12 | 1991-10-12 | 1992-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-12 | 1995-10-12 | 1996-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-12 | 1999-10-12 | 2000-04-12 | $7700.00 | Window Closed / Lapsed |