Cast stretch film of interpolymer compositions

A cast stretch film comprising an interpolymer composition which has two or more distinct peaks in the ATREF curve;

• and wherein
• T2−T1<25° C.
• where T2 is the elution temperature of the highest crystallization peak and T1 is the elution temperature of the lowest crystallization peak;
• and wherein
• Mv1/Mv2≦1;
• where Mv2 is the viscosity average molecular weight at the peak having the highest elution temperature and Mv1 is the viscosity average molecular weight at the peak having the lowest elution temperature;
• and wherein
• Mw/Mn≦3.

An interpolymer composition comprising;

• (A) a substantially linear ethylene/α olefin interpolymer present in the composition in an amount of from about 10 to about 100% by weight based on the combined weight of Components A and B;
• and
• (B) a heterogeneous interpolymer having a broad molecular weight distribution and a broad composition distribution present in the composition in an amount of from about 0 to about 90% by weight based on the combined weight of Components A and B;
• and
• wherein said interpolymer composition is characterized as having a viscosity at 100 rad/s and a relaxation time (τ) which satisfies either of the following relationships;
• Log(viscosity at 100 rad/s)≦4.43−0.8log(I2) or log(τ)>−1.2−1.3*log(I2).

An interpolymer composition which has two or more distinct peaks in the ATREF curve;

• and wherein
• T2−T1≦25° C.
• where T2 is the elution temperature of the highest crystallization peak and T1 is the elution temperature of the lowest crystallization peak;
• and wherein
• Mv1/Mv2≦1;
• where Mv2 is the viscosity average molecular weight at the peak having the highest elution temperature and Mv1 is the viscosity average molecular weight at the peak having the lowest elution temperature;
• and wherein
• Mw/Mn≦3.