公开(公告)号：US20190169797A1

公开(公告)日：2019-06-06

申请号：US16316758

申请日：2017-06-20

申请人： RISE INNVENTIA AB

发明人： Ali NADERI

IPC分类号： D21H11/18 ,  C08B11/12 ,  C08L1/28 ,  D21C9/00 ,  D21H21/06

摘要： The present invention relates to a method of producing a nanofibrillated cellulose (NFC), the nanofibrillated cellulose product obtained and the use of the nanofibrillated cellulose product. The method comprises the steps of: Providing cellulosic fibres dispersed in water; Solvent-exchanging water in the fibres to an organic solvent, such as alcohol, suitably ethanol or isopropanol; Impregnating the fibres with a solution comprising a halogenated aliphatic acid having more than 2 carbon atoms; Heat-treating the impregnated fibres at a temperature of more than 50° C. in an alkaline solution comprising an organic solvent, which solution is optionally aqueous, to carboxyalkylatethe fibres; Washing the fibres; Converting the carboxyl groups their alkali metal counter-ion form; Optionally filtering the fibres; Dispersing the fibres in water; Mechanically disintegrating the fibres to provide the NFC product.