US4168989A
Expired / Lapsed
US
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Stripping composition for thermoset resins and method of repairing electrical apparatus
Assignee: Westinghouse Electric Corp
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Filing: 1977-04-25
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Granted: 1979-09-25
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Expires: 1997-04-25
Abstract
Abstract A stripper composition for thermoset resins is disclosed which comprises about 1 to about 99% of an aromatic compound which has a boiling point over 180 DEG C. and is a phenol or a primary or secondary amine, and about 1 to about 99% of a carboxylic acid compound which has a boiling point over 180 DEG C. and is a rosin acid or a mono- or di-carboxylic fatty acid or an ester thereof. The composition also preferably includes sufficient hydrogen bonding compound to react with any acid present in the composition plus about 20 to about 50% in excess of that amount. A swelling agent is also preferably included.
Inventors
- 👤 Leonard E. Edelman
- 👤 Gerhard R. Sprengling
- 👤 Louis A. Cargnel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:46
CPC Classifications
C; C11; C11D; C11D7/00; C11D7/22; C11D7/26; C11D7/261; C11D7/262; C11D7/265; C11D7/266; C11D7/32; C11D7/3209; C11D7/3272; C11D7/50; C11D7/5004; C11D7/5013; C23; C23G; C23G5/00; C23G5/02; C11D7/24
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
154 words
A composition consisting essentially of: (A) about 1 to about 99% of an aromatic compound which has a boiling point over 180° C. selected from the group consisting of aromatic phenols, aromatic primary amines, aromatic secondary amines, and mixtures thereof; (B) about 1 to about 99% of a carboxylic acid compound selected from the group consisting of carboxylic acids, esters of carboxylic acids, and mixtures thereof, which has a boiling point over 180° C.; and (C) sufficient hydrogen bonding compound to react with any acid present in said composition plus about 20 to about 50 phr (parts by weight per 100 parts of said aromatic compound plus said carboxylic acid compound) in excess of that amount, said hydrogen bonding compound having a boiling point over 180° C. and having at least one pair of unshared electrons capable of forming a hydrogen bond with said aromatic compound, said composition being a liquid at 150° C.
Claim 2
Dependent Claim
154 words
A composition consisting essentially of: (A) about 1 to about 99% of an aromatic compound which has a boiling point over 180° C. selected from the group consisting of aromatic phenols, aromatic primary amines, aromatic secondary amines, and mixtures thereof; (B) about 1 to about 99% of a carboxylic acid compound selected from the group consisting of carboxylic acids, esters of carboxylic acids, and mixtures thereof, which has a boiling point over 180° C.; and (C) sufficient hydrogen bonding compound to react with any acid present in said composition plus about 20 to about 50 phr (parts by weight per 100 parts of said aromatic compound plus said carboxylic acid compound) in excess of that amount, said hydrogen bonding compound having a boiling point over 180° C. and having at least one pair of unshared electrons capable of forming a hydrogen bond with said aromatic compound, said composition being a liquid at 150° C.
Claim 3
Dependent Claim
27 words
A composition according to claim 1 wherein said carboxylic acid compound is selected from the group consisting of rosin acids, fatty acids, esters thereof, and mixtures thereof.
Claim 4
Dependent Claim
25 words
A composition according to claim 1 wherein said aromatic compound, said carboxylic acid compound, and said composition each have a boiling point over 250° C.
Claim 5
Dependent Claim
14 words
A composition according to claim 1 wherein said carboxylic acid compound is tall pitch.
Claim 6
Dependent Claim
13 words
A composition according to claim 1 wherein said aromatic compound is a phenol.
Claim 7
Dependent Claim
21 words
A composition according to claim 5 wherein said phenol is selected from the group consisting of resorcinol, β-naphthol, and mixtures thereof.
Claim 8
Dependent Claim
33 words
A composition according to claim 1 wherein the concentration of said aromatic compound is about 10 to about 50% and the concentration of said carboxylic acid compound is about 50 to about 90%.
Claim 9
Dependent Claim
23 words
A composition according to claim 1 wherein said hydrogen bonding compound has a boiling point over 250° C. and has non-vicinal hydroxyl groups.
Claim 10
Dependent Claim
14 words
A composition according to claim 8 wherein said hydrogen bonding compound is triethylene glycol.
Claim 11
Dependent Claim
25 words
A composition according to claim 1 which includes up to about 50 phr of a swelling agent which has a boiling point over 180° C.
Claim 12
Dependent Claim
20 words
A composition according to claim 10 wherein the concentration of said swelling agent is about 5 to about 30 phr.
Claim 13
Independent Claim
176 words
A method of removing thermoset resins from an article comprising immersing the article in a composition heated between about 150° and about 250° C. which consists essentially of: (A) about 1 to about 99% of an aromatic compound which has a boiling point over 180° selected from the group consisting of aromatic phenols, aromatic primary amines, aromatic secondary amines, and mixtures thereof; (B) about 1 to about 99% of a carboxylic acid compound selected from the group consisting of carboxylic acids, esters of carboxylic acids, and mixtures thereof, which has a boiling point over 180° C.; and (C) sufficient hydrogen bonding compound to react with any acid present in said composition plus about 20 to about 50 phr (parts by weight per 100 parts of said aromatic compound plus said carboxylic acid compound) in excess of that amount, said hydrogen bonding compound having a boiling point over 180° C. and having at least one pair of unshared electrons capable of forming a hydrogen bond with said aromatic compound, said composition being a liquid at 150° C.
Claim 14
Independent Claim
176 words
A method of removing thermoset resins from an article comprising immersing the article in a composition heated between about 150° and about 250° C. which consists essentially of: (A) about 1 to about 99% of an aromatic compound which has a boiling point over 180° selected from the group consisting of aromatic phenols, aromatic primary amines, aromatic secondary amines, and mixtures thereof; (B) about 1 to about 99% of a carboxylic acid compound selected from the group consisting of carboxylic acids, esters of carboxylic acids, and mixtures thereof, which has a boiling point over 180° C.; and (C) sufficient hydrogen bonding compound to react with any acid present in said composition plus about 20 to about 50 phr (parts by weight per 100 parts of said aromatic compound plus said carboxylic acid compound) in excess of that amount, said hydrogen bonding compound having a boiling point over 180° C. and having at least one pair of unshared electrons capable of forming a hydrogen bond with said aromatic compound, said composition being a liquid at 150° C.
Claim 15
Dependent Claim
13 words
A method according to claim 12 wherein said article is an electric motor.
Claim 16
Independent Claim
237 words
A method of removing the coils from an electrical apparatus having coils of insulated wire embedded in a laminated core comprising: (1) first, severing at least one end of said coils; (2) second, immersing said apparatus in a composition heated between about 150° and about 250° C. which consists essentially of: (A) about 1 to about 99% of an aromatic compound which has a boiling point over 180° C. selected from the group consisting of aromatic phenols, aromatic primary amines, aromatic secondary amines, and mixtures thereof; (B) about 1 to about 99% of a carboxylic acid compound selected from the group consisting of carboxylic acids, esters of carboxylic acids, and mixtures thereof, which has a boiling point over 180° C.; and (C) sufficient hydrogen bonding compound to react with any acid present in said composition plus about 20 to about 50 phr (parts by weight per 100 parts of said aromatic compound plus said carboxylic acid compound) in excess of that amount, said hydrogen bonding compound having a boiling point over 180° C. and having at least one pair of unshared electrons capable of forming a hydrogen bond with said aromatic compound, said composition being a liquid at 150° C.; (3) removing said laminated core from said composition after the insulation of said coils has been destroyed and removing the wire of said coils from said laminated core in either order; and (4) cleaning said laminated core.
Claim 17
Independent Claim
237 words
A method of removing the coils from an electrical apparatus having coils of insulated wire embedded in a laminated core comprising: (1) first, severing at least one end of said coils; (2) second, immersing said apparatus in a composition heated between about 150° and about 250° C. which consists essentially of: (A) about 1 to about 99% of an aromatic compound which has a boiling point over 180° C. selected from the group consisting of aromatic phenols, aromatic primary amines, aromatic secondary amines, and mixtures thereof; (B) about 1 to about 99% of a carboxylic acid compound selected from the group consisting of carboxylic acids, esters of carboxylic acids, and mixtures thereof, which has a boiling point over 180° C.; and (C) sufficient hydrogen bonding compound to react with any acid present in said composition plus about 20 to about 50 phr (parts by weight per 100 parts of said aromatic compound plus said carboxylic acid compound) in excess of that amount, said hydrogen bonding compound having a boiling point over 180° C. and having at least one pair of unshared electrons capable of forming a hydrogen bond with said aromatic compound, said composition being a liquid at 150° C.; (3) removing said laminated core from said composition after the insulation of said coils has been destroyed and removing the wire of said coils from said laminated core in either order; and (4) cleaning said laminated core.
Claim 18
Dependent Claim
17 words
A method according to claim 14 wherein said cleaning step comprises vapor degreasing followed by solvent leaching.
Claim 19
Dependent Claim
27 words
A method according to claim 14 wherein said carboxylic acid compound is selected from the group consisting of rosin acids, fatty acids, esters thereof, and mixtures thereof.
Claim 20
Dependent Claim
25 words
A method according to claim 14 wherein said aromatic compound, said carboxylic acid compound, and said composition each have a boiling point over 250° C.
Claim 21
Dependent Claim
14 words
A method according to claim 14 wherein said carboxylic acid compound is tall pitch.
Claim 22
Dependent Claim
13 words
A method according to claim 14 wherein said aromatic compound is a phenol.
Claim 23
Dependent Claim
21 words
A method according to claim 19 wherein said phenol is selected from the group consisting of resorcinol, β-naphthol, and mixtures thereof.
Claim 24
Dependent Claim
33 words
A method according to claim 14 wherein the concentration of said aromatic compound is about 10 to about 50% and the concentration of said carboxylic acid compound is about 50 to about 90%.
Claim 25
Dependent Claim
23 words
A method according to claim 14 wherein said hydrogen bonding compound has a boiling point over 250° C. and has nonvicinal hydroxyl groups.
Claim 26
Dependent Claim
14 words
A method according to claim 22 wherein said hydrogen bonding compound is triethylene glycol.
Claim 27
Dependent Claim
27 words
A method according to claim 14 wherein said composition includes up to about 50 phr of a swelling agent which has a boiling point over 180° C.
Claim 28
Dependent Claim
20 words
A method according to claim 24 wherein the concentration of said swelling agent is about 5 to about 30 phr.
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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) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |