Patent ID: 11866520
Assignee: PHOSPHONICS LIMITED
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  Y | IPC B  C

Claim 0:
1. A compound comprising a substantially insoluble polysaccharide compound selected from cellulose and starch having a backbone comprising more than 20 sugar moieties wherein at least one of the sugar moieties is derivatised at one or more of its hydroxyl groups with a ligand (L) bound to the sugar moiety by a sulphur atom wherein the ligand L is of formula:

—S(0)a(C R1R2)nX, wherein:
independently in each occurrence, R1 and R2 are selected from hydrogen, an optionally substituted, linear or branched C1-40-alkyl, C2-40-alkenyl or C2-40-alkynyl group, an aryl and a C1-40-alkylaryl group;
a is, independently in each occurrence from 0 to 2;
n is independently an integer from 1 to 22:
X is selected from:
—CR1R2R3;
a divalent group linking two sugar moieties;
—CR1R2 (CR1R2)nC(═W)R;
—CR1R2 (CR1Z)i QhCHR1Z;
—CR1R2(CR1Z)i Qh[(CHR1)nW]tR1;
—(CR1Z)i Qh C(═W)R1 
—CR1R2(CR1Z)i Qh R3 
—OC(═W)R;
wherein
R is independently selected from H, R1, —OR1, —NR1R2, —NHNR1R2 and —SR1;
R3 is an optionally substituted, linear or branched C1-40-alkyl, C2-40-alkenyl or
C2-40-alkynyl group, an aryl and a C1-40-alkylaryl group;
Q is independently selected from —C(═W1)W2—and —W2C(═VV1)—;
W, W1 and W2 are independently selected from oxygen, sulfur, —N(R1)—and —
N(NR1 R2);
Z is independently selected from —OR1, —NR1R2 and —SR1;
h is independently 0 or 1;
i is independently from 0 to 6;
t is independently an integer from 1 to 20; and

[C(═W)]h(W(C R1R2)m)nZ.