Benzene → Tetralin

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The solutions useful in the method of the present invention include those obtained by a combination of a polyolefin and a petroleum hydrocarbon such as benzene, toluene, xylene, solvent naphtha or the like or a chlorinated hydrocarbon such as trichloroethylene, tetrachloroethylene, dichloroethane, dichloroethylene or the like. Low density polyethylene, medium density polyethylene, high density polyethylene, atactic (amorphous) polypropylene, isotactic (crystalline) polypropylene, ethylene-propylene copolymer, propylene-butylene copolymer can be mentioned as useful polyolefins. It is preferable to use a solution having a gelation point of 40°-60° C at a concentration in the range of 1-5% by weight. However, among the above-mentioned, a combination of benzene (b.p. 80.1° C), cyclohexane (b.p. 80.7° C), dichloroethylene (b.p. 83.5° C) with a resin other than atactic polypropylene is not of practical value because of poor solubility. Though tetraline (b.p. 210.5° C) or kerosene (b.p. 150°-320° C) provides nice gel-forming property, they are the examples which are not useful on account of too high boiling point. For the foregoing reason, toluene, xylene and tetrachloroethylene are preferable as a solvent for polyolefins and inflammable tetrachloroethylene is most suitable if safety is also taken into consideration.

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