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US 4,857,673 AGranted
Polyolefin compounds having improved thermal stability and electrical conductors coated therewith
AssigneeVulkor, Incorporated
InventorsEdward V. Wilkus, Ida Fridland, Joseph E. Betts
Life of this patent
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Abstract
A composition suitable as an electrical conductor insulation is provided which is composed of an ethylene-containing polymer, a halogenated flame retardant, an antimony compound, a lead compound, a peroxide curing agent and optionally a phenolic antioxidant and a zinc salt.
Claims19
A curable, flame retardant insulating composition which consists essentially of:
- (a) an ethylene containing polymer;
- (b) ethylene-bis (tetrahalophthalimide;
- (c) an antimony compound
- (d) from 0.25 parts by weight to 2.5 parts by weight of lead compound per 100 parts by weight of ethylene containing polymer;
- (e) a combination of a sterically hindered phenol with at least one zinc salt of a mercaptoimidazole selected from the group consisting of a zinc salt of 2-mercapto-benzimidazole and a zinc salt of 2-mercaptotolyl-imidazole;
- and
- (f) a peroxide curing agent.
4 more elements
A curable, flame retardant insulating composition which consists essentially of
- ______________________________________ PHR ______________________________________ (a) low density polyethylene and 100 low molecular weight polyethylene 90:10;
- (b) ethylene bis(tetrabro- 30 mophthalimide;
- (c) antimony oxide;
- 15 (d) di-basic lead phthalate;
- 1.5 (e) fumed colloidal silica;
- 5 (f) tetrakis (methylene-3(3',5'-di- tert-butyl-4'-hydroxyphenyl) propionate) 4 (g) zinc salt of 2-mercaptotolylimi- dazole;
- 8 (h) dimethylpolysiloxane gum;
- 5 (i) trimethylol propane trimethacrylate;
- 1 and (j) -p and .sub.--m-isomers of bis-tert- butyl peroxy) diisopropyl benzene 3. ______________________________________
6 more elements
Dependencies are inferred from the claim text.