Amorphous propylene-ethylene copolymers are described herein that can include high amounts of ethylene and exhibit desirable softening points and needle penetrations. The desirable combinations of softening points and needle penetrations in these propylene-ethylene copolymers allow them to have a broad operating window. Due their broad operating window, the propylene-ethylene copolymers can be utilized in a wide array of applications and products, including hot melt adhesives.

Amorphous propylene-ethylene copolymers are described herein that can include high amounts of ethylene and exhibit desirable softening points and needle penetrations. The desirable combinations of softening points and needle penetrations in these propylene-ethylene copolymers allow them to have a broad operating window. Due their broad operating window, the propylene-ethylene copolymers can be utilized in a wide array of applications and products, including hot melt adhesives.

According to an embodiment, a method for preparing an amorphous polypropylene copolymer comprises injecting a volume of hexane into a nitrogen-purged reactor, the volume of the hexane corresponding to 20% to 80% of a volume of the reactor, injecting, into the reactor, and mixing an amount of alkyl cocatalyst, the amount of the alkyl cocatalyst corresponding to 1 to 50 times a weight of a primary catalyst, injecting the primary catalyst into the reactor, stirring, and then injecting a molecular weight regulator; and injecting propylene and a monomer for copolymerization into the reactor at a temperature ranging from 40° C. to 90° C.

According to an embodiment, a method for preparing an amorphous polypropylene copolymer comprises injecting a volume of hexane into a nitrogen-purged reactor, the volume of the hexane corresponding to 20% to 80% of a volume of the reactor, injecting, into the reactor, and mixing an amount of alkyl cocatalyst, the amount of the alkyl cocatalyst corresponding to 1 to 50 times a weight of a primary catalyst, injecting the primary catalyst into the reactor, stirring, and then injecting a molecular weight regulator; and injecting propylene and a monomer for copolymerization into the reactor at a temperature ranging from 40° C. to 90° C.

A composition comprising vinyl-terminated polyethylene having an Mn from about 200 g/mol to about 10,000 g/mol; and a comb polyolefin having polyethylene arms attached to a random copolymer backbone, said backbone including units derived from an alpha-olefin having 3 or more carbon atoms, where the polyethylene arms have an Mn from about 200 g/mol to about 10,000 g/mol, and where the comb polyolefin has an Mp from about 7,500 to about 400,000 g/mol.

A composition comprising vinyl-terminated polyethylene having an Mn from about 200 g/mol to about 10,000 g/mol; and a comb polyolefin having polyethylene arms attached to a random copolymer backbone, said backbone including units derived from an alpha-olefin having 3 or more carbon atoms, where the polyethylene arms have an Mn from about 200 g/mol to about 10,000 g/mol, and where the comb polyolefin has an Mp from about 7,500 to about 400,000 g/mol.

A composition comprising the following components: A) propylene/ethylene copolymer that has a density ≤0.880 g/cc, and a MWD(conv) from 2.00 to 3.00 and a melt viscosity (177 C)≤80,000 mPa*s; B) olefin multi-block copolymer that has a density ≤0.890 g/cc and a melt index (I2)≥0.5 g/10 min.

Amorphous propylene-ethylene copolymers are described herein that can include high amounts of ethylene and exhibit desirable softening points and needle penetrations. The desirable combinations of softening points and needle penetrations in these propylene-ethylene copolymers allow them to have a broad operating window. Due their broad operating window, the propylene-ethylene copolymers can be utilized in a wide array of applications and products, including hot melt adhesives.

Amorphous propylene-ethylene copolymers are described herein that can include high amounts of ethylene and exhibit desirable softening points and needle penetrations. The desirable combinations of softening points and needle penetrations in these propylene-ethylene copolymers allow them to have a broad operating window. Due their broad operating window, the propylene-ethylene copolymers can be utilized in a wide array of applications and products, including hot melt adhesives.

Amorphous propylene-ethylene copolymers are described herein that can include high amounts of ethylene and exhibit desirable softening points and needle penetrations. The desirable combinations of softening points and needle penetrations in these propylene-ethylene copolymers allow them to have a broad operating window. Due their broad operating window, the propylene-ethylene copolymers can be utilized in a wide array of applications and products, including hot melt adhesives.