AMORPHOUS PROPYLENE-ETHYLENE COPOLYMERS

摘要

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.

主权项

1. A process for producing a copolymer, said process comprising:
reacting propylene and ethylene in the presence of a catalyst system comprising an electron donor to form said copolymer, wherein said copolymer has a softening point in the range of 90 to 140° C., wherein said copolymer has a needle penetration that is equal to y, wherein y is defined by the following formula:
y≦−0.000000262249x6+0.000172031278x5−0.046669720165x4+6.701746779438x3−537.286013331959x2+22,802.983472587x−400,204.018086126 wherein x in the above formula is the softening point of said copolymer.