公开(公告)号：US20200317821A1

公开(公告)日：2020-10-08

申请号：US16303165

申请日：2017-05-23

Applicant: SAPPI Netherlands Services B.V.

Inventor： Rhodri WILLIAMS ,  Robert ENGLISH ,  John HEATON

IPC: C08B11/12 ,  C08B15/08 ,  C08J3/05 ,  C08J3/12 ,  C08B11/14 ,  C08B11/15

Abstract: The present invention provides a method for the production of chemically derivatized nanocellulose, comprising the step of a. contacting a precursor cellulosic material with a chemically derivatizing composition to form a liquid reaction mixture, and b. chemically reacting the formed liquid reaction mixture, and c. subjecting the formed liquid reaction mixture to microfluidisation, wherein the steps b. and c. are carried out simultaneously.

公开(公告)号：US20190002591A1

公开(公告)日：2019-01-03

申请号：US16064830

申请日：2016-12-19

Applicant: SAPPI Netherlands Services B.V.

Inventor： Robert ENGLISH ,  Ian GRAVESON ,  Saschi MOMIN ,  Nadege FERLIN

IPC: C08B3/10 ,  C08B3/08

Abstract: A process for the preparation of particulate acylated biopolymer comprising anhydroglucose units that comprises several steps. First, dispersing an amount of particulate non-surface modified biopolymer comprising anhydroglucose units in an amount of a liquid alkenyl carboxylatein order to form a first dispersion. Then, adding a catalytic composition to the first dispersion such a to form a second dispersion, heating the second dispersion to a temperature above ambient temperature, and cooling the second dispersion to ambient temperature. Thereafter, the obtained particulate acylated biopolymer is isolated. The amount of a liquid alkenyl carboxylate corresponds to a molar excess of alkenyl carboxylate, the molar excess being defined with respect to the moles of anhydroglucose units comprised in the amount of the particulate non-surface modified biopolymer. The catalytic composition comprises an amount of one, or two or more, non-nucleophilic bases.