公开(公告)号：US20150203595A1

公开(公告)日：2015-07-23

申请号：US14420935

申请日：2013-08-15

Applicant: Dow Global Technologies LLC

Inventor： Oliver Petermann ,  Matthias Sprehe

IPC: C08B13/00

CPC classification number: C08B13/00 ,  C08B11/20

Abstract: Two or more esters of a cellulose ether, each having the same ether and ester substituents but different weight average molecular weights are prepared in a process which comprises the steps of esterifying a cellulose ether with (i) an aliphatic monocarboxylic acid anhydride or (ii) a dicarboxylic acid anhydride or (iii) a combination of an aliphatic monocarboxylic acid anhydride and a dicarboxylic acid anhydride in the presence of an alkali metal carboxylate in two or more separate reactions, wherein in each reaction a different molar ratio [alkali metal carboxylate/anhydroglucose units of cellulose ether] is used to produce esters of the cellulose ether of different weight average molecular weights.

Abstract translation: 在包括以下步骤的方法中制备两种或更多种纤维素醚的酯，它们各自具有相同的醚和酯取代基但不同的重均分子量，该方法包括以下步骤：（i）脂肪族单羧酸酐或（ii） 二羧酸酐或（iii）在碱金属羧酸盐存在下在两个或更多个单独的反应中脂族单羧酸酐和二羧酸酐的组合，其中在每个反应中不同的摩尔比[碱金属羧酸盐/脱水葡萄糖 纤维素醚单元]用于生产不同重均分子量的纤维素醚的酯。