Flame retardant molding compositions containing group IVA metal oxides
AssigneeHenkel Loctite Corporation
InventorsAnthony A. Gallo, Tom Raught
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Abstract
A molding composition that is particularly useful for coating and encapsulating electronic or electrical devices is disclosed. The molding composition exhibits improved flame retardancy and includes an epoxy resin, a hardener for the epoxy resin, and flame retardant compounds of melamine cyanurate and an oxyanion of a Group VIA element, such as tungsten trioxide.
Claims24
A flame retardant molding composition substantially free of halogen, phosphorus, and antimony, comprising:
- an epoxy resin;
- melamine cyanurate;
- and
- a transition metal oxide containing an oxyanion of a Group VIA element.
A flame-retardant molding composition substantially free of elemental halogen, phosphorous, and antimony, comprising:
- about 4 weight % to about 12 weight %, based on the total weight of the composition of an epoxy resin;
- about 0.1 weight % to about 3.5 weight %, based on the total weight of the composition of melamine cyanurate;
- about 0.1 weight % to about 2 weight %, based on the total weight of the composition of tungsten trioxide;
- about 0.001 weight % to about 10 weight %, based on the total weight of the composition of a phenolic hardener;
- and
- about 10 weight % to about 85 weight %, based on the total weight of the composition of a filler material.
A method of coating an electrical or electronic device, comprising providing a molding composition comprising an epoxy resin, a melamine cyanurate, and a transition metal oxide containing an oxyanion of a Group VIA element contacting a surface of the device with the molding composition and heating the molding composition to a temperature sufficient to cure the molding composition and form a polymer on a surface of the device.
A method of imparting flame retardance to an epoxy molding composition comprising combining the epoxy molding composition with melamine cyanurate and a transition metal oxide containing an oxyanion of a Group VIA element.
Dependencies are inferred from the claim text.