Long-chain branched polymers and their production

US6300451A · kind A · utility

Assignee

• Exxon Chemical Patents, Inc. · US

Inventors

• Aspy K. Mehta · Humble, US
• Charles S. Speed · Dayton, US
• Jo Ann M. Canich · Houston, US
• Norbert Baron · Cologne, DE
• Bernard J. Folie · Sint-Genesius-Rode, BE
• Makoto Sugawara · Tokyo, JP
• Akihira Watanabe · Somalomo, CM
• Howard C. Welborn, Jr. · Houston, US

Key dates

• Filing date: Oct 24, 1994
• Grant date: Oct 9, 2001
• Expiry date: Oct 24, 2014

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P20/582
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Copolymers, and processes to make them, are provided which are derived from monomers comprising: PA1 a) one mono-olefin having a single Ziegler-Natta polymerizable bond; PA1 b) a second monomer having at least one Ziegler-Natta polymerizable bond; PA1 c) a third monomer having at least two Ziegler-Natta polymerizable bonds such monomer being: PA2 i) straight-chained and of less than six or at least seven carbon atoms; PA2 ii) other than straight chained; or PA2 iii) combinations thereof, such copolymer having: PA1 c) at least about one carbon-carbon unsaturated bond per number average molecule; PA1 d) viscous energy of activation (Ea) at least 1 kcal/mol greater than a copolymer having a linear backbone derived from same monomers, but excluding species having at least two Ziegler-Natta polymerizable bonds; PA1 e) crystallinity level of about 10% to about 50%; and PA1 f) M.sub.z /M.sub.w at least about 1.7. Such copolymers show enhanced melt processability and other attributes during end-product fabrication.