The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 09, 2021
Filed:
Nov. 14, 2017
3m Innovative Properties Company, St. Paul, MN (US);
Michelle M. Mok, St. Paul, MN (US);
Carl A. Laskowski, Minneapolis, MN (US);
Lucas D. McIntosh, Minneapolis, MN (US);
Hyacinth L. Lechuga, St. Paul, MN (US);
Timothy M. Gillard, St. Paul, MN (US);
Clinton P. Waller, Jr., White Bear Lake, MN (US);
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
The present disclosure provides a porous membrane made of pentablock copolymer. The porous membrane includes an ABCBA block copolymer and has a number of pores. The A block is immiscible with each of the B block and the C block, the B block has a glass transition temperature (T) of 90 degrees Celsius or greater, and the C block has a Tof 25 degrees Celsius or less. The A block comprises a poly(alkylene oxide), a substituted epoxide, a polylactam, or a substituted carbonate; B block comprises a vinyl aromatic monomer or a polyalkylmethacrylate and C block comprises a polyacrylate, a polysiloxane or a polyisoprene. A method of making a porous membrane is also provided. The method includes forming a film or a hollow fiber from a solution including a solvent and solids containing an ABCBA block copolymer. The method further includes removing at least a portion of the solvent from the film or the hollow fiber and contacting the film or the hollow fiber with a nonsolvent.