US 12,305,023 B2Granted

Cellulosic superabsorbent polymer from post-consumer textile waste

AssigneeThe Hong Kong Research Institute of Textiles and Apparel Limited

InventorsEdwin Yee Man Keh, Lei Yao, Alex Chan, Mimi Hetti, Yang Liu, Hung Chan, Xin Chen, Wendy Yu, Hosanna Poon

Life of this patent

Estimating the term…

The present disclosure provides methods of preparing cellulosic superabsorbent polymer (SAP) using cellulose powder.

Dependent claims

A method for preparing a cellulosic superabsorbent polymer (SAP), the method comprising:

contacting a cellulose powder having a degree of substitution (DS) of 0-0.206, epichlorohydrin, and an aqueous crosslinking solution comprising an alkali metal hydroxide thereby forming the cellulosic SAP, wherein epichlorohydrin has an initial concentration of 5% to 10% v/v in the aqueous crosslinking solution and the cellulose powder has an initial concentration of 0.1% to 5% wt/wt in the aqueous crosslinking solution.

Dependencies are inferred from the claim text.

C08L 1/10
Cellulose derivatives: esters of organic acids , i.e. acylates
C08B 3/12
Preparation of cellulose esters of organic acids: of polybasic organic acids
C08B 11/08
With substituted hydrocarbon radicals: with hydroxylated hydrocarbon radicals; Esters, ethers, or acetals thereof
C08B 15/10
Preparation of other cellulose derivatives or modified cellulose , e.g. complexes: crosslinking of cellulose

From the US filing history. Foreign family members aren’t listed.

Loading patent…