Arsonium latent catalysts for curing epoxy resins

Claim 2

A resinous composition suitable for insulating electrical members, comprising by weight: A. about 100 parts of an epoxy resin containing more than one 1,2 epoxy group per molecule, B. about 55 to 165 parts of an organic acid anhydride selected from the group consisting of monofunctional anhydrides and polyfunctional anhydrides effective as a curing agent for epoxy resins, and C. about 0.04 to 0.50 parts of a latent catalyst consisting essentially of a quaternary organic arsonium compound having the structural formula: ##EQU1## where R 1 , R 2 , R 3 and R 4 are selected from the group consisting of alkyl and aryl radicals having 1 to 21 carbon atoms and X is a halogen, radical.

Claim 3

The composition of claim 1, wherein the composition contains about 0.05 to 0.30 parts quaternary organic arsonium compound.

Claim 4

The composition of claim 1 wherein the epoxy resin comprises a resin selected from the group consisting of bisphenol A epoxy resins, novolac epoxy resins and mixtures thereof.

Claim 5

The composition of claim 3 also containing up to about 200 parts filler particles, of average particle sizes from about 10 to 300 microns, for 100 parts (A).

Claim 6

The composition of claim 3, wherein the epoxy resin contains up to about 70 parts epoxy reactive diluent and X is Cl, Br or I.

Claim 7

The composition of claim 5 being cured wherein the quaternary arsonium compounds are selected from the group consisting of triphenylarsonium iodide, tetraphenylarsonium chloride and mixtures thereof, the bisphenol A epoxy resin has an epoxy equivalent weight of from about 130 to 1200, the novolac epoxy resin has an epoxy equivalent weight of from about 100 to 500, the acid anhydride is selected from the group consisting of hexahydrophthalic anhydride, 1-methyl hexahydrophthalic anhydride, tetrahydrophthalic anhydride, 1-methyltetrahydrophthalic anhydride, phthalic anhydride, NADIC anhydride, NADIC methyl anhydride, pyromellitic dianhydride, polyazelaic polyanhydride, benzophenone tetracarboxylic acid dianhydride and mixtures thereof, and the epoxy resin contains about 20 to 50 parts neopentyl glycol diglycidylether reactive diluent.

Claim 8

The combination of an electrical member and a cured body of resinous insulation applied to the member, wherein the improvement comprises the insulation comprising the cured resinous composition of claim 3.

Claim 9

The combination of an insulated electrical transformer comprising a magnetic core, electrical windings disposed about the magnetic core and having a body of cured resinous insulation applied to the electrical windings, wherein the improvement comprises the insulation comprising the cured resinous composition of claim 3.

Claim 10

A cured resinous composition insulating electrical members, comprising by weight the reaction product of: A. about 100 parts of an epoxy resin containing more than one 1,2 epoxy group per molecule, B. about 55 to 165 parts of an anhydride selected from the group consisting of hexahydrophthalic anhydride, 1-methyl hexahydrophthalic anhydride, tetrahydrophthalic anhydride, 1-methyltetrahydrophthalic anhydride, phthalic anhydride, NADIC anhydride, NADIC methyl anhydride, pyromellitic dianhydride, polyazelaic polyanhydride, benzophenone tetracarboxylic acid dianhydride and mixtures thereof, and C. about 0.04 to 0.50 parts of a latent catalyst consisting essentially of a quaternary organic arsonium compound having the structural formula: ##STR4## where R 1 , R 2 , R 3 and R 4 are selected from the group consisting of alkyl and aryl radicals having 1 to 21 carbon atoms and X is a halogen radical.

Claim 11

A cured resinous composition insulating electrical members, comprising by weight the reaction product of: A. about 100 parts of an epoxy resin containing more than one 1,2 epoxy group per molecule, B. about 55 to 165 parts of an anhydride selected from the group consisting of hexahydrophthalic anhydride, 1-methyl hexahydrophthalic anhydride, tetrahydrophthalic anhydride, 1-methyltetrahydrophthalic anhydride, phthalic anhydride, NADIC anhydride, NADIC methyl anhydride, pyromellitic dianhydride, polyazelaic polyanhydride, benzophenone tetracarboxylic acid dianhydride and mixtures thereof, and C. about 0.04 to 0.50 parts of a latent catalyst consisting essentially of a quaternary organic arsonium compound having the structural formula: ##STR4## where R 1 , R 2 , R 3 and R 4 are selected from the group consisting of alkyl and aryl radicals having 1 to 21 carbon atoms and X is a halogen radical.

Claim 12

The resinous composition of claim 9 wherein the epoxy resin comprises a resin selected from the group consisting of bisphenol A epoxy resins, novolac epoxy resins and mixtures thereof, said resin containing about 20 to 50 parts of at least one epoxy reactive diluent selected from the group consisting of phenyl glycidyl ether, butyl glycidyl ether, alkyl glycidyl ethers, containing from 5 to 12 carbons, vinyl cyclohexene dioxide, endodlcyclopentadiene dioxide, octylene oxide and neopentyl glycol diglycidyl ether.

Claim 13

The composition of claim 9 wherein X is halogen and the electrical member is a metal selected from the group consisting of copper, iron and aluminum.

Claim 14

The combination of an electrical member and a cured body of resinous insulation applied to the member, wherein the improvement comprises the insulation comprising the cured resinous composition of claim 9.

Claim 15

The combination of an insulated electrical transformer comprising a magnetic core, electrical windings disposed about the magnetic core and having a body of cured resinous insulation applied to the electrical windings, wherein the improvement comprises the insulation comprising the cured resinous composition of claim 9.

Claim 16

The composition of claim 5, wherein X is Cl.

Claim 17

A resinous composition suitable for insulating electrical members, comprising by weight: A. about 100 parts of an epoxy resin containing more than one 1,2 epoxy group per molecule, B. about 55 to 165 parts of an acid anhydride selected from the group consisting of monofunctional anhydrides and polyfunctional anhydrides effective as a curing agent for epoxy resins, and C. about 0.04 to 0.50 parts of a latent catalyst consisting essentially of a quaternary organic arsonium compound selected from the group consisting of triphenylarsonium methyl iodide and tetraphenylarsonium chloride and mixtures thereof.

Claim 18

A resinous composition suitable for insulating electrical members, comprising by weight: A. about 100 parts of an epoxy resin containing more than one 1,2 epoxy group per molecule, B. about 55 to 165 parts of an acid anhydride selected from the group consisting of monofunctional anhydrides and polyfunctional anhydrides effective as a curing agent for epoxy resins, and C. about 0.04 to 0.50 parts of a latent catalyst consisting essentially of a quaternary organic arsonium compound selected from the group consisting of triphenylarsonium methyl iodide and tetraphenylarsonium chloride and mixtures thereof.

Claim 19

The resinous composition of claim 15, wherein the acid anhydride is selected from the group consisting of hexahydrophthalic anhydride, 1-methyl hexahydrophthalic anhydride, tetrahydrophthalic anhydride, 1-methyltetrahydrophthalic anhydride, phthalic anhydride, NADIC anhydride, NADIC methyl anhydride, pyromellitic dianhydride, polyazelaic polyanhydride, benzophenone tetracarboxylic acid dianhydride and mixtures thereof.

Claim 20

The resinous composition of claim 15, wherein the composition contains about 0.05 to 0.30 parts quaternary organic arsonium compound.

Claim 21

The resinous composition of claim 15, wherein the epoxy resin comprises a resin selected from the group consisting of bisphenol A epoxy resins, novolac epoxy resins and mixtures thereof.

Claim 22

The resinous composition of claim 15, also containing up to about 200 parts filler particles, of average particle sizes from about 10 to 300 microns, for 100 parts (A).

Claim 23

The resinous composition of claim 18, wherein the bisphenol A epoxy resin has an epoxy equivalent weight of from about 130 to 1200, the novolac epoxy resin has an epoxy equivalent weight of from about 100 to 500 and the composition is cured.

Claim 24

The resinous composition of claim 18, wherein the epoxy resin contains up to about 70 parts epoxy reactive diluent.

Claim 25

The combination of an electrical member and a cured body of resinous insulation applied to the member, wherein the improvement comprises the insulation comprising the cured composition of claim 15.

Claim 26

The combination of an insulated electrical transformer comprising a magnetic core, electrical windings disposed about the magnetic core and having a body of cured resinous insulation applied to the electrical windings, wherein the improvement comprises the insulation comprising the cured resinous composition of claim 15.