Flame retardant insulation compositions having improved high temperature performance
AssigneeEquistar Chemicals, LP
InventorLESTER Y. LEE
Life of this patent
Estimating the term…
Abstract
Flame retardant compositions useful as insulation for 150° C.-rated wire and cable applications are provided. The compositions of the invention utilize an ethylene-alkyl acrylate copolymer base resin with a two-component stabilizer package consisting of a zinc salt of a mercaptobenzimidazole and an aromatic secondary amine compound. Also, included to achieve the requisite flame retardance, crosslinkability and physical properties are a brominated flame retardant, antimony trioxide, a hydrated inorganic filler and a chemical crosslinking agent.
Claims14
A crosslinkable, flame retardant composition useful for high temperature service wire and cable insulation comprising:
- (1) 30 to 65 weight percent of a base resin which is a copolymer of ethylene and 3 to 40 weight percent alkyl acrylate having the formula
- 7
- wherein R′ is C1-4 alkyl and R″ is hydrogen or methyl having a melt index of 0.1 to 15 g/10 mins;
- (2) 1 to 10 weight percent of a stabilizer consisting of a mixture of a zinc salt of a mercaptobenzimidazole of the formula
- 8
- where R is a C1-4 alkyl group and n is 0 to 4 with a secondary aromatic amine, the ratio of the zinc mercaptobenzimidazole compound to the secondary aromatic amine ranging from 0.2:1 to 20:1;
- (3) 5 to 40 weight percent brominated aromatic flame retardant compound;
- (4) 1.5 to 20 weight percent antimony trioxide;
- (5) 5 to 50 weight percent hydrated inorganic filler;
- and
- (6) 0.1 to 4 weight percent chemical crosslinking agent.
Dependencies are inferred from the claim text.