Functionalized olefin interpolymers, compositions and articles prepared therefrom and methods for making the same

A composition comprising at least one functionalized functionalized ethylene/α-olefin interpolymer, and wherein the at least one functionalized ethylene interpolymer is formed from a reactive composition comprising an ethylene/α-olefin interpolymer, at least one unsaturated compound containing at least one heteroatom, and at least one initiator, and

• wherein the ethylene/α-olefin interpolymer contains greater than 50 mole percent polymerized ethylene monomers, based on total moles polymerizable monomers, and an α-olefin, and
• wherein the ethylene/α-olefin interpolymer has a melt viscosity less than 50,000 cP at 350° F. (177° C.), a molecular weight distribution (Mw/Mn) from 1 to 5, a melt index (I2) from greater than 300 to 3,500 g/10 min, and a density from 0.865 to 0.895 g/cm3, and
• wherein the α-olefin is selected from propylene, 1-butene, 1-hexene and 1-octene, and
• wherein the at least one functionalized ethylene/α-olefin interpolymer is present in an amount from 15 to 50 weight percent, based on the total weight of the composition, and wherein the composition further comprises from 5 to 35 weight percent of at least one tackifier, based on the total weight of the composition, and from 5 to 35 weight percent of at least one oil or at least one wax, based on the total weight of the composition;
• and
• wherein the at least one functionalized ethylene/α-olefin interpolymer has a number average molecular weight (Mn) from 4,000 to 30,000 g/mole, and
• wherein the at least one unsaturated compound is a carbonyl-containing compound, and wherein the weight ratio of the carbonyl-containing compound to the at least one initiator is from 10:1 to 500:1, and wherein the carbonyl-containing compound is present in an amount of at least 1.0 weight percent, based on the total weight of the reactive composition, and the at least one initiator is present in an amount from 500 ppm to 2200 ppm, based on the total weight of the reactive composition.