Importance

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Abstract

The present invention relates to a biaxially stretched film whose main component is a linear low density polyethylene showing, in measurement of a melting point by a differential scanning calorimeter, a main peak temperature (Tma) within the range of 118.degree..+-.5.degree. C. in a melting curve obtained when after a temperature of the polyethylene is kept at 190.degree. C. for 30 minutes, the temperature is dropped down to 20.degree. C. at a cooling rate of 100.degree. C./minute and subsequently raised at a heating rate of 10.degree. C./minute (hereinafter referred to as 'melting curve after rapidly cooling') and showing a temperature difference between Tma and Tmb of at least 3.degree. C. wherein Tmb is a main peak temperature in a melting curve obtained when after the temperature of the polyethylene is kept at 190.degree. C. for 30 minutes, the temperature is dropped down to 20.degree. C. at a cooling rate of 10.degree. C./minute and subsequently raised at a heating rate of 10.degree. C./minute (hereinafter referred to as 'melting curve after gradually cooling') (hereinafter referred to as 'lowered melting point polyethylene in rapidly cooling'). Since this film is excellent in stability on stretching, the stretching can be stably conducted by a low tensile strength upon stretching, as a result a stretched film having excellent stretchability and shrinkability, and having excellent elastic restoration can be obtained.

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First Claim