| 摘要 |
A composition suitable for use as a dielectric comprises a base polymer consisting of from 70 to 95% by weight of an amorphous saturated copolymer of ethylene with propylene or butene, the said copolymer containing from 10 to 80% mol. of ethylene and having a Mooney viscosity (ML 212 DEG F.) of 20 to 80, the remaining 30 to 5% by weight of base polymer consisting of polyethylene, up to 120 parts by weight per 100 parts of the base polymer of an anhydrous oxide of zinc, iron, aluminium, silicon or titanium; an oxyhydrate of aluminium or silicon; a carbonate of calcium, zinc, barium, strontium or magnesium; or a silicate with zinc, calcium, magnesium or aluminium base as a filler, and an organic peroxide and sulphur as vulcanizing agents.ALSO:A band of textile material (e.g. cotton, flax, hemp, glass, regenerated cellulose, polyester) is coated on one or both sides with a composition comprising a base polymer consisting of from 70-95% by weight of an amorphous, unsaturated copolymer of ethylene with propylene or butene, the said copolymer containing from 10-80% mol of ethylene and having a Mooney viscosity (ML 212 DEG F.) of from 20-80, the remaining 30-5% by weight of base polymer consisting of polyethylene, up to 120 parts by weight per 100 parts by weight of the base polymer of an anhydrous oxide of zinc, iron, aluminium, silicon or titanium; an oxy-hydrate of aluminium or silicon; a carbonate of calcium, zinc, barium, strontium or magnesium; or a silicate with zinc, calcium, magnesium or aluminium base as a filler, and an organic peroxide and sulphur as vulcanizing agents. |
