Block copolyolefins possessing a tapered structure

US7754832B2 · kind B2 · utility

Assignee

• The Regents of the University of California · US

Inventors

• Guillermo C. Bazan · Lompoc, US
• Steve Diamanti · Lompoc, US
• Edward J. Kramer · Lompoc, US
• Vikram Khanna · Goleta, US
• Glenn H. Frederickson · Lompoc, US
• Atsushi Hotta · Tokyo, JP

Key dates

• Filing date: Aug 19, 2005
• Grant date: Jul 13, 2010
• Expiry date: Jul 30, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F297/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A method of preparing a polymer having a tapered block copolymer structure. The method comprises polymerizing a first olefin monomer and a different second olefin monomer in the presence of a catalyst supporting living or quasi-living polymerization. In certain embodiments, the catalyst comprises two neutral metal complexes. In preferred embodiments, a tapered block copolymer structure is formed by adding one monomer in a single batch at the start of the polymerization reaction, and adding a second monomer throughout the course of the reaction. The present invention also provides polymers having one or more tapered block copolymer sections, and compositions based on these polymers.