# US 5,347,249 A · Magnet wire and electromagnetic relay using the same

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- Number: US 5,347,249 A
- Document ID: US5347249A
- Status: Granted
- Kind: A
- Application number: 08/052,998
- Filed: 1993-04-27
- Granted: 1994-09-13
- Earliest claimed: 1986-11-11
- Assignees: Sumitomo Electric Industries, Ltd.
- Inventors: Akihisa Takeuchi; Waichiro Kozen; Hirohiko Nakabayashi
- Web page: https://patentgrep.com/patent/US5347249A

## CPC

- H01H 50/44: Magnetic coils or windings
- H01B 3/302: {Polyurethanes or polythiourethanes; Polyurea or polythiourea}
- Y10T 428/294: including metal or compound thereof [excluding glass, ceramic and asbestos]
- Y10T 428/2942: Plural coatings
- Y10T 428/2947: Synthetic resin or polymer in plural coatings, each of different type
- H01H: ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES (contact cables H01B7/10; electrolytic self-interrupters H01G9/18; emergency protective circuit arrangements H02H; switching by electronic means without contact-making H03K17/00)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A polyurethane magnet wire comprising a conductor having provided thereon a polyurethane insulation coating, wherein the total amount of the phenolic compounds contained in organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt% or less based on the weight of the coating and the total amount of the organic compounds is 2 wt% or less based on the weight of the coating; and an electric relay comprising such a wire.

## Claims

### Claim 1

An electromagnetic relay comprising a polyurethane magnet wire which comprises a conductor having provided thereon a polyurethane insulation coating which contains organic compounds, wherein the total amount of phenolic compounds contained in the organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt% or less based on the weight of said coating and the total amount of said organic compounds is 2 wt% or less based on the weight of said coating.

### Claim 2 (depends on 1)

An electromagnetic relay as claimed in claim 1, wherein said relay is a sealed type electromagnetic relay.

### Claim 3

An electromagnetic relay comprising a polyurethane magnet wire which comprises a conductor having provided thereon a polyurethane insulation coating which contains organic compounds, wherein the total amount of phenolic compounds contained in the organic compounds which evaporate from said coating by heating at 280.degree. C. for 2 minutes is 0.2 wt.% or less based on the weight of said coating and the total amount of said organic compounds is 2 wt.% or less based on the weight of said coating, and having provided on said polyurethane insulation coating a coating of an organic lubricant having a vapor pressure of 1.times.10.sup.-1 Torr or less at 200.degree. C.

### Claim 4 (depends on 3)

An electromagnetic relay as claimed in claim 3, wherein said relay is a sealed type electromagnetic relay.