Functionalized propylene based elastomer composition and method of making

A method comprising:

• contacting a first propylene-based elastomer with an oxygen containing gas at a temperature greater than or equal to about 200° C. for a period of time sufficient to form a functionalized propylene-based elastomer comprising from about 4 to about 25 wt % units derived from one or more C2 or C4-C12 alpha-olefins;
• a triad tacticity greater than about 90%;
• a heat of fusion less than about 75 J/g;
• and
• greater than about 0.1 wt % of oxygen containing functional groups selected from carboxylic acids, anhydrides, ketones, carbonates, esters, ethers, lactones, and combinations thereof;
• and
• melt mixing the functionalized propylene-based elastomer with one or more C2-C12 polyalphaolefins to form a blended composition.

An article comprising:

• i) a C2-C12 polyalphaolefin;
• and
• ii) a functionalized propylene-based elastomer comprising from about 4 to about 25 wt % units derived from one or more C2 or C4-C12 alpha-olefins;
• a triad tacticity greater than about 90%;
• a heat of fusion less than about 75 J/g;
• and
• a plurality of oxygen containing functional groups selected from carboxylic acids, anhydrides, ketones, carbonates, esters, ethers, lactones, and combinations thereof,
• wherein the functionalized propylene-based elastomer is a reaction product of:
• i) an oxygen containing gas;
• and
• ii) a first propylene-based elastomer comprising from about 4 to about 25 wt % of units derived from one or more C2 or C4-C12 alpha-olefins and having a triad tacticity greater than about 90% and a heat of fusion less than about 75 J/g.