# US 4,400,676 A · Electrically insulated coil

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 4,400,676 A
- Document ID: US4400676A
- Status: Granted
- Kind: A
- Application number: 06/212,157
- Filed: 1980-12-02
- Granted: 1983-08-23
- Earliest claimed: 1979-12-07
- Assignees: Tokyo Shibaura Denki Kabushiki Kaisha
- Inventors: Hisayasu Mitsui
- Web page: https://patentgrep.com/patent/US4400676A

## CPC

- H01B 13/065: {Insulating conductors with lacquers or enamels}
- C08G 59/68: characterised by the catalysts used
- C08G 59/70: Chelates
- H01B 3/04: mica
- H01B 3/40: epoxy resins
- H01F 27/327: {Encapsulating or impregnating (encapsulating coil and core H01F27/022)}
- H02K 3/30: Windings characterised by the insulating material
- Y10T 428/251: Mica
- Y10T 428/2911: Mica flake
- Y10T 428/31511: Of epoxy ether
- Y10T 428/31525: Next to glass or quartz
- Y10T 428/31529: Next to metal
- Y10T 428/31612: As silicone, silane or siloxane
- Y10T 428/31663: As siloxane, silicone or silane
- 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})
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H02K: DYNAMO-ELECTRIC MACHINES (dynamo-electric relays H01H53/00; conversion of DC or AC input power into surge output power {H03K3/53})
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

An electrically insulated coil comprising a coil; and a mica tape wound around said coil and containing a resin composition; said resin composition including an epoxy resin, a curing catalyst consisting of an aluminum compound, and a curing accelerator selected from the group consisting of a silane compound having a hydroxyl group and a polysiloxane compound having a hydroxyl group, said curing catalyst being added in an amount of 0.1 to 5% by weight based on said epoxy resin, said curing accelerator being added in an amount of 0.1 to 10% by weight based on said epoxy resin, and said resin composition being cured by heating after said mica tape is wound around said coil.

## Claims

### Claim 1

An electrically insulated coil comprising:
a coil; and
a mica tape containing a resin composition wound about said coil;
said resin composition comprising an epoxy resin, an aluminum complex curing catalyst having the formula: ##STR5## wherein R.sub.1 and R.sub.2 independently are each an alkyl group, e and f are 0, 1, 2 or 3 with the total of e+f not exceeding 3 and wherein B is a ligand selected from the group consisting of: ##STR6## wherein groups R.sub.3 -R.sub.8 independently of one another are alkyl, and a silane compound curing accelerator of the formula: ##STR7## wherein R and R' independently of one another are alkyl, phenyl, aralkyl, vinyl or allyl, q and r are 0, 1, 2 or 3 with the sum of q and r not exceeding 3 or a polysiloxane curing accelerator of the formula: ##STR8## wherein groups R.sub.1 -R.sub.7 independently of each other are a monovalent organosiloxane group optionally substituted by alkyl, phenyl, vinyl, aralkyl, allyl or hydroxyl; each of s, t, x and y, being 0, 1 or 2 with the sum of s+t and the sum of x+y each not exceeding 2, u and w each being 0, 1 or 2 and a and b each being 0 or an integer of 1 or more, said curing catalyst being present in said composition in an amount of 0.1 to 5% by weight based on the epoxy resin, and said curing accelerator being present in said composition in an amount of 0.1 to 10% by weight based on said epoxy resin; and
curing said composition by heating the same after said mica tape is wound around said coil.

### Claim 2 (depends on 1)

The insulated coil of claim 1, wherein said mica tape is a compound mica tape backed with a glass cloth.

### Claim 3 (depends on 1)

The insulated coil of claim 1, wherein said epoxy resin component is selected from the group consisting of bisphenol A epoxy resins, bisphenol F epoxy resins, phenol novolak epoxy resins, cresol novolak epoxy resins, alicyclic epoxy resins, heterocycle group containing epoxy resins, hydrogenated bisphenol A epoxy resins, aliphatic epoxy resins, epoxy resins obtained by reacting an aromatic, aliphatic or alicyclic carboxylic acid with epichlorohydrin, spirocycle group containing epoxy resins, glycidyl ether epoxy resins obtained by reacting an o-allylphenol novolak compound with epichlorohydrin and glycidyl ether epoxy resins obtained by reacting a diallyl bisphenol compound containing allyl groups in the ortho position relative to the hydroxyl groups of the bisphenol component.

### Claim 4 (depends on 1)

The insulated coil of claim 1, wherein said aluminum complex curing catalyst is aluminum trisalkylacetoacetate or aluminum trisacetylacetonate.