High melt strength polymers and method of making same

USRE42276E1 · kind E1 · reissue

Assignee

• DOW GLOBAL TECHNOLOGIES LLC · US

Inventors

• Alexander W. Degroot · Lake Jackson, US
• James C. Stevens · Richmond, US
• Sylvie Desjardins · Lake Jackson, US
• Jeffrey D. Weinhold · Lake Jackson, US
• Edmund M. Carnahan · Fresno, US
• David T. Gillespie · Pearland, US
• Daniel D. VanderLende · Sugar Land, US

Key dates

• Filing date: Oct 23, 2009
• Grant date: Apr 5, 2011
• Expiry date: Oct 23, 2029

Classification

• Technology area (CPC —): General

Abstract

A polymer composition comprises: (a) a high molecular weight, branched component; and (b) a low molecular weight, branched component. Some polymer compositions are characterized by a substantial absent of amyl or methyl branches and a melt strength (MS) that satisfies the following relationship: where x is greater than or equal to about 12.5 and y is greater than or equal to about 3.Some polymers are characterized by a melt strength (MS) that satisfies the following relationship: where x is greater than or equal to about 3 and y is greater than or equal to about 4.5 and a molecular weight distribution of greater than 3. A process for making polymers is also disclosed.