Polyethylene and polypropylene block copolymers

US11279780B2 · kind B2 · utility

Assignees

• Cornell University · IT
• Regents of the University of Minnesota · US

Inventors

• Geoffrey W. Coates · Lansing, US
• James Eagan · Austin, US
• Anne M. LaPointe · Sunnyvale, US
• Frank S. Bates · Minneapolis, US

Key dates

• Filing date: May 26, 2017
• Grant date: Mar 22, 2022
• Expiry date: May 26, 2037

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09J2453/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A semicrystalline multiblock copolymer includes alternating blocks of semicrystalline isotactic polypropylene (iPP) and semicrystalline polyethylene (PE), having a block arrangement according to formula (I): (iPPw)p(PEx)(iPPy)m(PEz)n   (I), wherein p is 0 or 1; m is 0 or 1; n is 0 or 1; the sum of p, m, and n is 1, 2, or 3; and the sum of w, x, y, and z is greater than or equal to 40 kg/mol, with the provisos that: when m and n are 0, the sum of w and x is greater than or equal to 140 kg/mol; and when p and n are 0, the sum of y and x is greater than or equal to 140 kg/mol. Related compositions and methods are also provided.