Sulfonylazide derivative for tie layer

A multilayer film comprising:

• a layer (A) comprising an olefin-based polymer;
• a layer (B) that is a tie layer comprising a sulfonamide derivative grafted olefin-based polymer (SD-g-PO);
• a layer (C) comprising a polar component;
• a layer (D) that is a tie layer, the layer (D) comprising the SD-g-PO;
• a layer (E) comprising an olefin-based polymer;
• the multilayer film has the structure A/B/C/D/E;
• and
• the SD-g-PO in layer (B) and the SD-g-PO in layer (D) each form at least one linkage with the polar component of the layer (C), the linkages having the Structure (5)
• wherein the nitrogen, N, is bound to a carbon, C, of the polyolefin;
• X is selected from group consisting of O, S, P, and N;
• Y is selected from O, S, PH, and NH;
• R is a C1-C8 alkyl group;
• and
• m and n each independently is 0 or 1 with the proviso when m=1, n=0 and when n=1, m=0.

A process comprising:

• melt blending (i) polyolefin that is an ethylene/1-octene copolymer (PE) having a first melt flow (MF1) and (ii) a sulfonyl azide derivative at a temperature greater than or equal to the decomposition temperature of the sulfonyl azide derivative;
• grafting the sulfonyl azide derivative to the polyolefin substrate with at least 50% grafting efficiency;
• and
• producing a sulfonamide derivative grafted polyolefin (SD-g-PO) comprising from 0.15 wt % to 0.61 wt % maleic anhydride (MAH), the SD-g-PE having a second melt flow (MF2), wherein MF1-MF2 is from 0.06 g/10 min to 0.50 g/10 min as measured in accordance with ASTM D 1238 (190° C./2.16 kg).