Polyolefin-based elastic film structures, laminates and methods thereof

A process for manufacturing a stretch-modified elastomeric multilayer film, the process comprising:

• providing a multilayer film comprising:
• a core layer comprising a first propylene/alpha-olefin copolymer, wherein the first propylene/alpha-olefin copolymer comprises at least 50 wt. % propylene, has a melt flow rate (230° C./2.16 Kg) from 0.1 g/10 min to 35 g/10 min, and has a crystallinity in the range of from at least 1 percent by weight to 30 percent by weight;
• and
• at least one outer layer independently comprising a second propylene/alpha-olefin copolymer and from 2.5 to 30 wt. % of an antiblock agent, wherein the second propylene/alpha-olefin copolymer comprises at least 50 wt. % propylene, has a melt flow rate (230° C./2.16 Kg) from 0.1 g/10 min to 35 g/10 min, and has a crystallinity in the range of from at least 1 percent by weight to 30 percent by weight;
• wherein the crystallinity of the first propylene/alpha-olefin copolymer is equal to or greater than the crystallinity of the second propylene/alpha-olefin copolymer;
• performing a first stretch of the film in at least one direction to an elongation of 100% or greater of its original length to form a stretch-modified multilayer film;
• and
• substantially relaxing the stretch-modified multilayer film in the at least one direction.