Flame retardant ethylene family resin composite and flame retardant electric wire or cable

• US 20040106709A1
• Filed: 11/17/2003
• Published: 06/03/2004
• Est. Priority Date: 11/19/2002
• Status: Active Grant

• Current Assignee: Fujikura Limited
• Original Assignee: Fujikura Limited
• Inventors: Suzuki, Jun, Toshimitsu, Jun
• Granted Patent: US 6,995,198 B2
• Time in Patent Office: Days
• US Class Current: 524/261
• CPC Class Codes: C08K 2003/2217 of magnesium
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08L 23/08 Copolymers of ethene C08L23/16 takes precedence
• CPC Class Codes: H01B 3/441 from alkenes
• CPC Class Codes: H01B 7/295 using material resistant to flame

Abstract

A dispersion medium (31) composed as a mixture of EVA and EEA has therein a dispersion system of flame retardant particles (R1) including magnesium hydroxide treated with polyorganosiloxane, so that polyorganosilane (41) is dispersed with an equal uniformity to a flame retardant agent (40) containing magnesium hydroxide, thereby allowing a resultant flame retardant resin composite (CR1) to have a high flame retardancy, enabling prevention of the emission of smoke in great quantities or that of detrimental gases, such as halogen gases, when burnt, while having a specific gravity of 1.14 or less, enabling the separation by specific gravity difference, and this (CR1) is used as a covering material (12) for an electric wire (10) or cable (20) to be high in flame retardancy.

Claims

1. A flame retardant ethylene family resin composite comprising flame retardant particles dispersed in an ethylene family copolymer, each respectively having a flame retardant agent including magnesium hydroxide and polyorganosilane.

2. A flame retardant ethylene family resin composite according to claim 1, wherein the resin composite has a specific gravity of 1.14 or less.

3. A flame retardant ethylene family resin composite according to claim 1, wherein each flame retardant particle comprises polyorganosiloxane-treated magnesium hydroxide.

4. A flame retardant ethylene family resin composite according to claim 1, wherein each flame retardant particle comprises polyorganosiloxane-treated magnesium hydroxide, and an assisting flame retardant agent.

5. A flame retardant ethylene family resin composite according to claim 4, wherein the resin composite comprises a blend of 40 to 50 parts in weight of polyorganosiloxane-treated magnesium hydroxide and 2 to 10 parts in weight of the assisting flame retardant agent, to 100 parts in weight of the ethylene family copolymer.

6. A flame retardant ethylene family resin composite according to claim 5, wherein the ethylene family copolymer comprises a mixture of 20 to 40 parts in weight of ethylene vinyl acetate copolymer and 80 to 60 parts in weight of ethylene ethyl acrylate copolymer.

7. A flame retardant ethylene family resin composite according to claim 4, wherein the assisting flame retardant agent comprises an aluminium hydroxide composite.

8. A flame retardant ethylene family resin composite according to claim 7, wherein the aluminium hydroxide composite comprises ammonium molybdate-treated aluminium hydroxide.

9. A flame retardant ethylene family resin composite according to claim 4, wherein the assisting flame retardant agent comprises silicon powder.

10. A flame retardant ethylene family resin composite according to claim 5, wherein the resin composite further comprises 0.5 to 5.0 parts in weight of a process assisting agent as an additive.

11. A flame retardant electric wire or cable comprising a conductor, and a covering material covering the conductor, the covering material comprising a flame retardant ethylene family resin composite according to claim 1.