US4011185A
Expired / Lapsed
US
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Aqueous insulating varnishes
Assignee: SWCC Corp
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Filing: 1976-01-20
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Granted: 1977-03-08
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Expires: 1996-01-20
Abstract
Abstract Insulating varnishes capable of forming a film possessing excellent electrical and mechanical properties can be obtained by reacting a reaction product of (1) a reactant of a dicarboxylic acid or a tricarboxylic acid or a derivative thereof comprising an aromatic dicarboxylic acid or a derivative thereof in an amount of at least 95 equivalent % [the term "equivalent" as used herein means (number of moles) x (number of reactive functional groups in one molecule)] of the total of the (1), (2) a primary diol and (3) an aliphatic polyhydric alcohol having at least 3 hydroxyl groups with (4) an aromatic teracarboxylic acid or derivative thereof, and subsequently dispersing the reaction product into an aqueous solution containing ammonia or an organic amine.
Inventors
- 👤 Etsuo Hosokawa
- 👤 Misao Waki
- 👤 Katsumi Asada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:21
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; C; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/20; C08G63/68; C08G63/685; C08G63/6854; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31681
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
108 words
An aqueous insulating varnish prepared by Stage 1: reacting to a substantially complete degree (1) a compound selected from the group consisting of an aromatic dicarboxylic acid and a lower alkyl ester thereof, (2) an aliphatic primary diol and (3) an aliphatic alcohol having at least three hydroxyl groups in quantities satisfying the requirements: ##EQU3## wherein a, b and c each represent equivalent quantities greater than zero of the compounds of (1), (2) and (3), respectively; Stage 2: reacting the thus produced reaction product with (4) a compound selected from the group consisting of an aromatic tetracarboxylic acid and an anhydride thereof in a quantity satisfying the requirement:
Claim 2
Dependent Claim
108 words
An aqueous insulating varnish prepared by Stage 1: reacting to a substantially complete degree (1) a compound selected from the group consisting of an aromatic dicarboxylic acid and a lower alkyl ester thereof, (2) an aliphatic primary diol and (3) an aliphatic alcohol having at least three hydroxyl groups in quantities satisfying the requirements: ##EQU3## wherein a, b and c each represent equivalent quantities greater than zero of the compounds of (1), (2) and (3), respectively; Stage 2: reacting the thus produced reaction product with (4) a compound selected from the group consisting of an aromatic tetracarboxylic acid and an anhydride thereof in a quantity satisfying the requirement:
Claim 3
Dependent Claim
81 words
5 ( (b+c) - a) ≦d ≦2 ( (b+c) - a), wherein d represents an equivalent quantity greater than zero of the compound of (4), at a temperature at which no gellation occurs and which is above the melting point of said reaction product but below the sublimation temperature of the compound of (4), and for a time during which no gellation occurs; and Stage 3: subsequently dispersing the resulting product in an aqueous solution containing ammonia or an organic amine.
Claim 4
Dependent Claim
81 words
5 ( (b+c) - a) ≦d ≦2 ( (b+c) - a), wherein d represents an equivalent quantity greater than zero of the compound of (4), at a temperature at which no gellation occurs and which is above the melting point of said reaction product but below the sublimation temperature of the compound of (4), and for a time during which no gellation occurs; and Stage 3: subsequently dispersing the resulting product in an aqueous solution containing ammonia or an organic amine.
Claim 5
Dependent Claim
58 words
The aqueous insulating varnish according to claim 1, wherein the equivalent quantities of the compounds in (1), (2), (3) and (4) are in the ranges of from 10 to 45%, from 20 to 52%, from 3 to 25% and from 10 to 45%, respectively, of the total equivalent quantities of the compounds in (1), (2), (3) and (4).
Claim 6
Dependent Claim
58 words
The aqueous insulating varnish according to claim 1, wherein the equivalent quantities of the compounds of (1), (2), (3) and (4) are in the ranges of from 15 to 40%, from 30 to 50%, from 4 to 20% and from 13 to 40%, respectively, of the total equivalent quantities of the compounds of (1), (2), (3) and (4).
Claim 7
Dependent Claim
33 words
The aqueous insulating varnish according to claim 1, wherein after the compound in (4) is reacted in said stage 2, ethylene glycol is added to the reaction system thereby to stop the reaction.
Claim 8
Dependent Claim
23 words
The aqueous insulating varnish according to claim 1 wherein the aromatic dicarboxylic acid in (1) is selected from terephthalic acid and isophthalic acid.
Claim 9
Dependent Claim
16 words
The aqueous insulating varnish according to claim 1 wherein the compound of (2) is ethylene glycol.
Claim 10
Dependent Claim
16 words
The aqueous insulating varnish according to claim 1 wherein the compound of (3) is tris-2-hydroxyethyl isocyanurate.
Claim 11
Dependent Claim
16 words
The aqueous insulating varnish according to claim 1 wherein the compound of (3) is trimethylol propane.
Claim 12
Dependent Claim
16 words
The aqueous insulating varnish according to claim 1 wherein the compound of (4) is pyromellitic dianhydride.
Claim 13
Dependent Claim
17 words
The aqueous insulating varnish according to claim 1 wherein the compound of (4) is benzophenone tetracarboxylic dianhydride.
Claim 14
Dependent Claim
36 words
The aqueous insulating varnish according to claim 1 wherein the dispersion of the reaction product dispersed in an aqueous solution containing ammonia or a volatile organic amine has a pH value ranging from 5.0 to 8.0.
Claim 15
Dependent Claim
15 words
The aqueous insulating varnish according to claim 1 wherein the organic amine is monoethanol amine.
Claim 16
Dependent Claim
32 words
The aqueous insulating varnish according to claim 1 wherein the reaction in said stage 1 is continued till the acid value of the reaction product reaches the range between 170 and 310.
Claim 17
Dependent Claim
33 words
The aqueous insulating varnish according to claim claim 1 wherein the reaction in said stage 2 is continued till the acid value of the reaction product reaches the range between 70 and 140.
Claim 18
Dependent Claim
32 words
The aqueous insulating varnish according to claim 1 wherein the reaction in said stage 2 is continued till the acid value of the reaction product reaches the range between 70 and 100.
Claim 19
Dependent Claim
23 words
The aqueous insulating varnish according to claim wherein a titanium chelate is added to the aqueous solution which is the final reaction product.
Claim 20
Dependent Claim
31 words
The aqueous insulating varnish according to claim 16, wherein the titanium chelate is a member selected from the group consisting of triethanolamine titanate, titanium acetylacetate and ammonium salt of titanium lactate.
Claim 21
Dependent Claim
26 words
The aqueous insulating varnish according to claim 1 wherein a titanium chelate and 2,4,7,9-tetramethyl-5-decyne-4,7-diol are added to the aqueous solution which is the final reaction product.
Claim 22
Dependent Claim
27 words
The aqueous insulating varnish according to claim 1 wherein a titanium chelate and polyethylene oxide are added to the aqueous solution which is the final reaction product.
Claim 23
Dependent Claim
27 words
The aqueous insulating varnish according to claim 1, wherein the reaction in said stage 2 is carried out at a temperature of from 160 to 250° C.
Claim 24
Dependent Claim
23 words
The aqueous insulating varnish according to claim 1, wherein the varnish has a resin content in the range between 20to 60% by weight.
Claim 25
Dependent Claim
23 words
The aqueous insulating varnish according to claim 21, wherein the solvent portion of the varnish contains at least 50% by weight of water.
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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) | 1980-03-07 | 1980-09-06 | 1981-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-07 | 1984-09-06 | 1985-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-07 | 1988-09-06 | 1989-03-08 | $7700.00 | Window Closed / Lapsed |