Method for producing a population of particles of polyvinylidene difluoride or of particles of a copolymer comprising polyvinylidene difluoride

US11945919B2 · kind B2 · utility

Assignee

• Evonik Operations GmbH · DE

Inventors

• Maximilian Alexander Dechet · Zirndorf, DE
• Stephanie Kloos · Arenenberg, CH
• Jochen Schmidt · Trochtelfingen, DE
• Wolfgang Peukert · Borgo San Lazzaro, DE

Key dates

• Filing date: Mar 26, 2019
• Grant date: Apr 2, 2024
• Expiry date: Mar 11, 2041

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L27/16
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention concerns a method for producing a population of particles of a polymer, wherein the polymer is polyvinylidene difluoride (=PVDF) or a copolymer comprising polyvinylidene difluoride, wherein the polymer is dissolved in an organic solvent, wherein molecules of the solvent comprise or consist of 3 to 22 carbon atoms, one or more oxygen atom(s) as heteroatom(s) and at most one carbocyclic or heterocyclic residue comprising carbon atoms which carbocyclic or heterocyclic residue is an aromatic residue, wherein the carbon atoms in the carbocyclic or heterocyclic residue are carbon atoms taken from said 3 to 22 carbon atoms, wherein the one or more oxygen atom(s) is/are part of at least one carboxylic acid ester group or carbonyl group, wherein the carbon atom in the carboxylic acid ester group and the carbonyl group is one of said 3 to 22 carbon atoms or/and at least one ether group and at most three hydroxyl groups, wherein in case of presence of at least one hydroxyl group the number of ether groups always exceeds the number of hydroxyl groups, wherein in case of presence of only 3 carbon atoms the molecule comprises additionally at least one pseudohalogen or additionally …