Propylene/α-olefins block interpolymers

US8273838B2 · kind B2 · utility

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Colin Li Pi Shan · Pearland, US
• Lonnie G. Hazlitt · Lake Jackson, US
• Yunwa W. Cheung · Fryeburg, US
• Benjamin C. Poon · Pearland, US
• Phillip D. Hustad · Manvel, US
• Roger L. Kuhlman · Lake Jackson, US
• Edmund M. Carnahan · Fresno, US
• XiaoHua Qiu · Midland, US
• Angela N. Taha · Missouri City, US

Key dates

• Filing date: Mar 15, 2007
• Grant date: Sep 25, 2012
• Expiry date: Mar 15, 2027

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F297/083
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Embodiments of the invention provide a class of propylene/α-olefin block interpolymers. The propylene/α-olefin interpolymers are characterized by an average block index, ABI, which is greater than zero and up to about 1.0 and a molecular weight distribution, Mw/Mn, greater than about 1.3. Preferably, the block index is from about 0.2 to about 1. In addition or alternatively, the block propylene/α-olefin interpolymer is characterized by having at least one fraction obtained by Temperature Rising Elution Fractionation (“TREF”), wherein the fraction has a block index greater than about 0.3 and up to about 1.0 and the propylene/α-olefin interpolymer has a molecular weight distribution, Mw/Mn, greater than about 1.3.