EP0153501A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Novel synthetic homo- and heteropolysaccharides and a method for the preparation thereof
Assignee: National Starch and Chemical Investment Holding Corp
•
Filing: 1984-12-29
•
Granted: —
•
Expires: 2004-12-29
Abstract
Abstract Mono- and polysaccharides comprising one to about 20 saccharide units which also contain a reducing carbon atom are reacted with 3-halo-1,2-propandiol in the presence of a cationic exchange resin to form 3-halo-2-hydroxypropyl glycosides or glycidyl glycosides. These glycosides react with natural polysaccharides such as starch and plant gums to form novel synthetic homo- and heteropolysaccharides with pendant saccharide side chains.
Inventors
- 👤 John Ji-Hsiung Tsai
- 👤 Martin M. Tessler
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 12:35
CPC Classifications
C; C08; C08B; C08B11/00; C08B11/02; C08B11/04; C08B31/00; C08B31/08; C08B37/00; C08B37/006; C08B37/0087; C08B37/0093; C08B37/0096
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
58 words
A homo- or heteropolysaccharide ether derivative having the general structure wherein P-0 represents a polysaccharide molecule selected from the group consisting of starch, gum and cellulose, (saccharide) n -0- represents a mono- or polysaccharide where 0 is attached to a glycosidic carbon atom in the terminal saccharide ring of (saccharide) n , and n is 1 to 20.
Claim 2
Dependent Claim
58 words
A homo- or heteropolysaccharide ether derivative having the general structure wherein P-0 represents a polysaccharide molecule selected from the group consisting of starch, gum and cellulose, (saccharide) n -0- represents a mono- or polysaccharide where 0 is attached to a glycosidic carbon atom in the terminal saccharide ring of (saccharide) n , and n is 1 to 20.
Claim 3
Dependent Claim
24 words
The derivative of Claim 1, wherein the saccharide unit of (saccharide) n is selected from the group consisting of glucose, xylose, maltose, and fructose.
Claim 4
Dependent Claim
17 words
The derivative of Claim 2, wherein the saccharide unit is glucose and n is 1 to 10.
Claim 5
Dependent Claim
15 words
The derivative of Claim 3, wherein P-0 represents a starch molecule or a gum molecule.
Claim 6
Dependent Claim
15 words
The derivative of Claim 4, wherein the gum is guar gum or locust bean gum.
Claim 7
Dependent Claim
73 words
A process for preparing the homo- or heteropolysaccharide ether derivative of Claim 1, which comprises the steps of: (a) reacting a polysaccharide base selected from the group consisting of starch, gum and cellulose with 0.1 to 100% by weight, based on the dry polysaccharide base, of a glycoside reagent having the general formula (sacharide) n -0-R, wherein R is and/or and X is chlorine or bromine, and (b) isolating the resulting ether derivative.
Claim 8
Dependent Claim
39 words
The process of Claim 6, wherein the polysaccharide base is a starch base and wherein the reaction is carried out in an aqueous medium at a pH of 11-13 for 0.5 to 20 hours at a temperature of 20-95°C.
Claim 9
Dependent Claim
47 words
The process of Claim 6, wherein the polysaccharide base is a gum base and wherein the reaction is carried out in an aqueous medium containing a water-miscible solvent and 0.05-20% excess alkali, based on the dry gum, at a temperature of 15-100°C., for 0.5 to 20 hours.
Claim 10
Dependent Claim
44 words
The process of Claim 6, wherein the glycoside reagent is prepared by reacting a monosaccharide or polysaccharide containing a reducing carbon atom and having up to about 20 saccharide units with an excess of a 3-halo-1,2-propandiol in the presence of a cationic exchange resin.
Claim 11
Dependent Claim
21 words
The process of Claim 9, wherein the 3-halo-1,2-propandiol is 3-chloro- or 3-bromo-1,2-propandiol and the exchange resin is a sulfonated crosslinked polystyrene.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.