Title:
可逆的に架橋されたセルロースエーテルおよび隣接するＯＨ基の選択的酸化によるその製造方法
Document Type and Number:
Japanese Patent JP6736297
Kind Code:
B2
Abstract:
Reversibly crosslinked, water-soluble cellulose ethers having at least two different ether components is disclosed. At least one ether component is an alkyl, hydroxyalkyl or carboxymethyl group and at least one is an alkyl group having an aldehyde function which forms hydrolyzable hemiacetals with free OH groups of the cellulose ether. The cellulose ethers are obtainable by selective oxidation of cellulose ethers containing alkyl groups having vicinal OH groups (glycol cleavage). Preferably, water-soluble cellulose ethers are co-etherified simultaneously or subsequently with 2,3-epoxypropanol (glycidol) or 3-chloro-1,2-propanediol and the 2,3-dihydroxypropyl ether groups converted entirely or partly into 2-oxoethyl ether groups by oxidation. Suitable oxidants include periodate, periodic acid or lead tetraacetate. After washing and drying, cellulose ethers reversibly crosslinked via hemiacetals can be dispersed in water or aqueous solutions, going into solution homogeneously with a time delay. No low molecular weight dialdehydes or other problematical crosslinking reagents are liberated on dissolution.
Inventors:
Laurent, Stern
Mike, Kleinert
Rudolf, Ehrler
Mike, Kleinert
Rudolf, Ehrler
Application Number:
JP2016010939A
Publication Date:
August 05, 2020
Filing Date:
January 22, 2016
Export Citation:
Assignee:
SE TYLOSE GMBH & CO.KG
International Classes:
C08B11/193
Domestic Patent References:
| JP63035603A |
Foreign References:
| EP0232851A1 | ||||
| US8580951 |
Attorney, Agent or Firm:
Hiroyuki Nagai
Yukitaka Nakamura
Yasukazu Sato
Satoru Asakura
Mari Asano
Hiroshi Sorimachi
Suzuki Keiyasu
Yukitaka Nakamura
Yasukazu Sato
Satoru Asakura
Mari Asano
Hiroshi Sorimachi
Suzuki Keiyasu