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Process for producing a crosslinked cellulose ether

A technology of cellulose ether and cellulose, which is applied in the field of production of cross-linked cellulose ether, can solve problems such as excessive cross-linking affecting the process, achieve uniform distribution, and enhance the effect of the process window

Pending Publication Date: 2021-12-03
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because alkalization and etherification reactions are exothermic, there are many factors that can affect whether excessive crosslinking occurs in the process

Method used

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  • Process for producing a crosslinked cellulose ether
  • Process for producing a crosslinked cellulose ether
  • Process for producing a crosslinked cellulose ether

Examples

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[0099] The following examples are provided to illustrate the invention in additional detail, but should not be construed as limiting the scope of the claims. All parts and percentages are by weight unless otherwise indicated.

[0100] Various terms and designations used in the following Inventive Examples (Inv. Ex.) and Comparative Examples (Comp. Ex.) are explained below and in Tables II to VI.

[0101] "HEMC" stands for hydroxyethylmethylcellulose.

[0102] "AGU" stands for anhydroglucose unit of cellulose ether.

[0103] "LVN" stands for the Intrinsic Viscosity Number of pulp as measured according to the procedure described in ISO 5351 (2010).

[0104] The various raw materials or ingredients used in the examples are explained below:

[0105] Epilox M 985 and Epilox P13-42 are poly(propylene glycol) diglycidyl ethers available from Leuna Harze AG.

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Abstract

A process for producing a crosslinked cellulose ether including the steps of: (a) contacting at least one cellulose material with at least one alkalization reagent to form an activated cellulose material; (b) contacting the activated cellulose material of step (a) with at least one etherification reagent to form an uncrosslinked cellulose ether; (c) subjecting the cellulose ether of step (b) to a simultaneous or stepwise washing and / or granulating step; (d) adding at least one crosslinking agent to the uncrosslinked cellulose ether during the washing and / or granulating of step (c) to form a crosslinked cellulose ether; and (e) any other optional components desired; and a crosslinked cellulose ether produced by the above process.

Description

technical field [0001] The present invention relates to a process for producing crosslinked cellulose ethers and to crosslinked cellulose ethers prepared by such a process. Background technique [0002] Cellulose derivatives, such as cellulose ethers, are widely used as thickeners, adhesives, binders and dispersants, water retaining agents, protective colloids, stabilizers and suspending agents due to their excellent properties and physiological safety. agents, emulsifiers and film formers. Furthermore, cellulose ethers are known to be used in dry-mix mortars in various construction applications to improve the rheology of the mortar. Additionally, cellulose ethers are used in mortars to impart water-retaining properties, thereby limiting the loss of water from the mortar to the absorbent substrate. This ensures that sufficient water is available to the hydraulic binder (cement or gypsum) during the setting reaction, resulting in a high mechanical strength of the final prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B28/02C04B28/14C08B11/02C08B11/08C08B15/00C08L1/08C08B11/20
CPCC04B24/383C04B28/02C04B28/14C08B11/02C08B11/08C08B15/005C08L1/08C08B11/20C04B2103/0062C04B40/0608C04B20/023
Inventor A·希尔德J·纽鲍尔S·门茨
Owner DOW GLOBAL TECH LLC
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