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US 6,638,617 B2Granted
Dual layer insulation system
AssigneeJudd Wire, Inc.
InventorsYoung Joon Kim, Anthony E. Listro, Akshay H. Trivedi
Life of this patent
Estimating the term…
Abstract
A low-smoke, highly flame-retardant and flexible dual layer insulation system, which demonstrates improved cut-through resistance, is provided. The inventive insulation system, which is suitable for use as an outer covering for wires or conductors, comprises a cross-linked, highly flame-retardant and halogen-free first insulating layer and a tough, flexible second insulating layer.
Claims33
A dual layer insulation system, which comprises:
- a) a first insulating layer having a thickness of at least about 0.6 millimeters and comprising a cross-linked, highly flame-retardant and halogen-free resin composition, wherein said resin composition comprises:
- 100 parts by weight of a thermoplastic resin;
- from about 100 to about 250 parts by weight of at least one flame-retarding agent;
- and from about 1 to about 10 parts by weight of an organosilicon compound represented by the formula:
- wherein R represents an alkyl group containing an acrylic or methacrylic group and wherein Y1, Y2, and Y3 each represents a group selected from an alkyl group, an alkoxyl group, and mixtures thereof;
- and
- b) a second insulating layer having a thickness and comprising a thermoplastic material selected from alloys of polyolefins and polyamides, polyamides, polyamide/polyether block copolymers, polyesters, polyethylenes, polyurethanes and mixtures thereof,
- wherein the thickness of said second insulating layer is at least 4 percent of said thickness of the first insulating layer.
5 more elements
A dual layer insulation system, which comprises:
- a) a first insulating layer having a thickness of at least about 0.6 millimeters and comprising a cross-linked, highly flame-retardant and halogen-free resin composition,
- wherein said resin composition comprises:
- 100 parts by weight of a thermoplastic resin;
- from about 150 to about 200 parts by weight of magnesium hydroxide;
- and from about 2 to about 5 parts by weight of an organosilicon compound represented by the formula:
- wherein R represents an alkyl group containing an acrylic or methacrylic group and wherein Y1, Y2, and Y3 each represents a group selected from an alkyl group, an alkoxyl group, and mixtures thereof;
- and
- b) a second insulating layer having a thickness and comprising flame retarded polyamide 11,
- wherein the thickness of said second insulating layer is at least 4 percent of the thickness of said first insulating layer.
6 more elements
An insulated conductor, comprising:
- a) a conductor having an outer surface;
- b) a first insulating layer provided directly on said outer surface of said conductor, wherein said first insulating layer has a thickness of at least about 0.6 millimeters and comprises a cross-linked, highly flame-retardant and halogen-free resin composition, wherein said resin composition comprises:
- 100 parts by weight of a thermoplastic resin;
- from about 100 to about 250 parts by weight of at least one flame-retarding agent;
- and from about 1 to about 10 parts by weight of an organosilicon compound represented by the formula:
- wherein R represents an alkyl group containing an acrylic or methacrylic group and wherein Y1, Y2, and Y3 each represents a group selected from an alkyl group, an alkoxyl group, and mixtures thereof;
- and
- c) a second insulating layer having a thickness and comprising a thermoplastic material selected from alloys of polyolefins and polyamides, polyamides, polyamide/polyether block copolymers, polyesters, polyethylenes, polyurethanes and mixtures thereof,
- wherein the thickness of said second insulating layer is at least 4 percent of the thickness of said first insulating layer.
6 more elements
An insulated conductor comprising a plurality of bunched, twisted or bundled wires, wherein said wires are coated with a dual layer insulation system, which comprises:
- a) a first insulating layer having a thickness of at least about 0.6 millimeters and comprising a cross-linked, highly flame-retardant and halogen-free resin composition, wherein said resin composition comprises:
- 100 parts by weight of a thermoplastic resin;
- from about 100 to about 250 parts by weight of at least one flame-retarding agent;
- and from about 1 to about 10 parts by weight of an organosilicon compound represented by the formula:
- wherein R represents an alkyl group containing an acrylic or methacrylic group and wherein Y1, Y2, and Y3 each represents a group selected from an alkyl group, an alkoxyl group, and mixtures thereof and
- b) a second insulating layer having a thickness and comprising a thermoplastic material selected from alloys of polyolefins and polyamides, polyamides, polyamide/polyether block copolymers, polyesters, polyethylenes, polyurethanes and mixtures thereof,
- wherein the thickness of said second insulating layer is at least 4 percent of the thickness of said first insulating layer.
4 more elements
A dual layer insulation system, which comprises:
- a) a first insulating layer having a thickness of at least about 0.6 millimeters and comprising a cross-linked, highly flame-retardant and halogen-free resin composition, wherein said resin composition comprises:
- 100 parts by weight of a thermoplastic resin;
- from about 100 to about 250 parts by weight of at least one flame-retarding agent;
- and from about 1 to about 10 parts by weight of an organosilicon compound represented by the formula:
- wherein R represents an alkyl group containing an acrylic or methacrylic group and wherein Y1, Y2, and Y3 each represents a group selected from an alkyl group, an alkoxyl group, and mixtures thereof;
- and
- b) a second insulating layer having a thickness and comprising a thermoplastic material selected from alloys of polyolefins and polyamides, polyamides, polyamide/polyether block copolymers, polyesters, polyethylenes, polyurethanes and mixtures thereof,
- wherein the thickness of said second insulating layer is at least 4 percent of the thickness of said first insulating layer, and
- wherein said first and second insulating layers are solidified by cooling said layers.
6 more elements
A process for preparing an insulated conductor comprising a conductor and at least two tightly-adhered, extruded, insulating layers provided thereon, wherein said process comprises:
- increasing the force under which molten material used to prepare an outer insulating layer is applied to an inner insulating layer provided on said conductor by constricting the flow of said molten material.
A process for preparing an insulated conductor comprising a conductor and at least two tightly-adhered, extruded, insulating layers provided thereon, wherein said process comprises:
- increasing the period of time in which said extruded, insulating layers are in contact prior to solidification by cooling said layers via ambient air cooling.
Dependencies are inferred from the claim text.