Patent US4115342A successfully refreshed from Google Patents.
US4115342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wire enamel with low soldering temperature
Assignee: Rea Magnet Wire Co Inc
•
Filing: 1976-09-13
•
Granted: 1978-09-19
•
Expires: 1996-09-13
Abstract
Abstract A wire enamel coating composition capable of forming an insulative coating on a wire to provide a solderability of less than 1 second at temperatures as low as 285-315° C and a thermoplastic flow temperature of at least 230° C comprising a predetermined ratio of an imidized polyester resin having a free hydroxyl content of 4-10% by weight and a blocked isocyanate; at least one aromatic solvent, and a catalyst.
Inventors
- 👤 Thomas A. Shelby
- 👤 Shelby W. Gallien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:07
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/303; H01B3/306; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/64; C08G18/6415; C08G18/6438; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/294
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
158 words
A wire enamel coating composition capable of forming an insulative coating on a wire characterized by a solderability of less than 1 second at a temperature of about 285°-315° C and a thermoplastic flow temperature of at least 230° C and comprising: (a) 1 part by weight of a coating composition of a resin mixture containing: (i) 1 part by weight of an imidized polyester resin containing 4-10% by weight free hydroxyl content, and (ii) 1.7-2.5 parts by weight of a blocked isocyanate; (b) about 3 parts by weight of the coating composition of an aromatic solvent capable of dissolving said resin and said blocked isocyanate and containing at least 45% by weight of cresylic acid, with the balance of the solvent having a boiling point of less than 200° C; and (c) about 0.1 to 10.0% by weight of said resin mixture of a catalyst to promote the reaction of the imidized polyester with the blocked isocyanate.
Claim 2
Dependent Claim
158 words
A wire enamel coating composition capable of forming an insulative coating on a wire characterized by a solderability of less than 1 second at a temperature of about 285°-315° C and a thermoplastic flow temperature of at least 230° C and comprising: (a) 1 part by weight of a coating composition of a resin mixture containing: (i) 1 part by weight of an imidized polyester resin containing 4-10% by weight free hydroxyl content, and (ii) 1.7-2.5 parts by weight of a blocked isocyanate; (b) about 3 parts by weight of the coating composition of an aromatic solvent capable of dissolving said resin and said blocked isocyanate and containing at least 45% by weight of cresylic acid, with the balance of the solvent having a boiling point of less than 200° C; and (c) about 0.1 to 10.0% by weight of said resin mixture of a catalyst to promote the reaction of the imidized polyester with the blocked isocyanate.
Claim 3
Dependent Claim
30 words
The wire enamel coating composition of claim 1 wherein said imidized polyester resin comprises a diol condensed with the reaction product of trimellitic acid or its anhydride with a diamine.
Claim 4
Dependent Claim
38 words
The composition of claim 2 wherein said diol is selected from the group consisting of ethylene glycol; 1, 2 propane diol; 1, 3 propane diol; 1, 2 butane diol; 1, 3 butane diol; and 1, 4 butane diol.
Claim 5
Dependent Claim
11 words
The composition of claim 2 wherein said diamine is methylene dianiline.
Claim 6
Dependent Claim
21 words
The coating composition of claim 1 wherein said blocked isocyanate comprises the reaction product of trimethylol propane, toluene diisocyanate, and phenol.
Claim 7
Dependent Claim
54 words
The coating composition of claim 1 wherein the balance of said solvent is selected from the group consisting of: (a) a semi-refined coal tar distillate characterized by distillation of 10% to not below 165° C, 70% to not above 190° C and 95% to not above 235° C; (b) xylene; and (c) mixtures thereof.
Claim 8
Dependent Claim
82 words
The coating composition of claim 6 wherein said solvent comprises: (a) 50 to 70% by weight of cresylic acid; (b) 0-50% by weight of a semirefined coal tar distillate characterized by distillation of (i) 10% to not below 165° C, (ii) 70% to not above 190° C, and (iii) 95% to not above 235° C; and (c) 0 to 30% by weight of xylene, wherein the sum total amount of said coal tar distillate and xylene equals 30 to 50% by weight.
Claim 9
Dependent Claim
24 words
The coating composition of claim 6 wherein said solvent comprises approximately 70% by weight of cresylic acid and approximately 30% by weight of xylene.
References Cited (Backward Citations)
US3697471A
Cited
US3852246A
Cited
US3514500A
Cited
US3793250A
Cited
US3652471A
Cited
US3896089A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-18 | 1982-03-20 | 1982-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-18 | 1986-03-20 | 1986-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-18 | 1990-03-20 | 1990-09-19 | $7700.00 | Window Closed / Lapsed |