Process for the preparation of cellulose derivatives containing amino groups
A process is described for the preparation of cellulose derivatives containing amino groups that involves reacting, in the presents of water as a reaction medium, alkali cellulose or alkali cellulose derivatives with reagents represented by the following formula, X—(CH 2 ) n —NR 1 R 2 in which: X is selected from the group consisting of chlorine, bromine, iodine and a sulfonic acid radical R′SO 3 , in which R′ is an aromatic radical or an aliphatic radical; n is at least 2; and R 1 and R 2 independently of each other are selected from the group consisting of aliphatic substituents, branched alkyl substituents, cyclic alkyl substituents, aryl substituents, aryl substituents substituted by heteroatoms, H, and R 1 and R 2 together form a ring with the nitrogen. In the process, the mole ratio of cellulose to water, of said reaction medium, is 1:5 to 1:40 mol water per mol of anhydroglucose unit (AGU). Amino functional cellulose derivatives prepared in accordance with the method of the present invention are useful in cosmetic formulations and aqueous paper treatment compositions.
1 . A process for the preparation of cellulose derivatives containing amino groups comprising reacting, in the presence of water as a reaction medium, a cellulose selected from the group consisting of alkali cellulose and alkali cellulose derivative with a reagent represented by the following general formula,
X—(CH 2 ) n —NR 1 R 2
wherein,
X is selected from the group consisting of chlorine, bromine, iodine and a sulfonic acid radical R′SO 3 , in which R′ is an aromatic radical or an aliphatic radical,
n is at least 2, and
R 1 and R 2 independently of each other are selected from the group consisting of aliphatic substituents, branched alkyl substituents, cyclic alkyl substituents, aryl substituents, aryl substituents substituted by heteroatoms, H, and R 1 and R 2 together form a ring with the nitrogen, R 1 and R 2 independently comprising 1-24 C-Atoms,
wherein the mole ratio of cellulose to water, of said reaction medium, is 1:5 to 1:40 mol water per mol of anhydroglucose unit (AGU).
2 . The process of claim 1 furthering comprising reacting said cellulose with an etherifying agent, wherein the mole ratio of etherifying reagent to AGU is 0.1:1 mol to 3:1 mol.
3 . The process of claim 1 of claim 1 wherein said cellulose derivative of said alkali cellulose derivative is a cellulose ether.
4 . The process of claim 3 wherein said cellulose ether has an overall degree of substitution of between 0.01 and 4,
a mean degree of substitution of alkyl substituents (DS alkyl ) of between 0 and 2.5, and
a molar degree of substitution of hydroxyalkyl substituents (MS hydroxyalkyl ) of between 0 and 3.5.
5 . The process of claim 2 wherein the mole ratio of etherifying reagent to AGU is 0.01:1 to 1.5:1.
6 . The process of claim 1 wherein the ratio of cellulose to water is 1:10 to 1:30 mol per mol of anhydroglucose unit.
7 . A cellulose derivative containing amino groups comprising:
a) substituents represented by the following formula,
—(CH 2 ) n —NR 1 R 2 ,
wherein R 1 and R 2 independently of each other are selected from the group consisting of aliphatic substituents, branched alkyl substituents, cyclic alkyl substituents, aryl substituents, aryl substituents substituted by heteroatoms, H, and R 1 and R 2 together form a ring with the nitrogen, R 1 and R 2 independently comprising 1-24 C-Atoms,
b) at least one alkyl substituent —R 3 represented by the formula
—(CH 2 ) m —CH 3 ,
wherein,
m is 0 to 3, and
said cellulose derivative containing amino groups having a DS alkyl >0.1, relative to said alkyl substituents —R 3 ,
wherein said cellulose derivative containing amino groups has an overall degree of substitution (sum of the individual degrees of substitution) of the substituents —(CH 2 ) n —NR 1 R 2 and —R 3 of between 0.8 and 2 per anhydroglucose unit, said overall degree of substitution being determined,
by measuring the nitrogen content (for substituents —(CH 2 ) n —NR 1 R 2 ), and by means of Zeisel cleavage (for substituents —R 3 ).
8 . A cellulose derivative containing amino groups comprising:
a) substituents bonded directly to the cellulose or a cellulose side chain, the substituents being represented by the following formula,
—(CH 2 ) n —NR 1 R 2 ,
wherein,
n is at least 2, and
R 1 and R 2 independently of each other are selected from the group consisting of aliphatic substituents, branched alkyl substituents, cyclic alkyl substituents, aryl substituents, aryl substituents substituted by heteroatoms, H, and R 1 and R 2 together form a ring with the nitrogen,
b) at least one alkyl substituent —R 3 represented by the following formula,
—(CH 2 ) m —CH 3 ,
wherein,
m is 0 to 3, and
said cellulose derivative containing amino groups having a DS alkyl >0.1, relative to said alkyl substituents —R 3 , and
c) at least one hydroxyalkyl substituent —R 4 represented by the following formula,
—CH 2 —CH(C p H 2p+1 )O—{CH 2 —CH(C p H 2p−1 )O} q —C r H 2r+1 ,
wherein,
p is 0 or 1,
q is 0 to 30,
r is 0 or 1, and
said cellulose derivative containing amino groups having a MS hydroxyalkyl >0.1, relative to said hydroxyalkyl substituents —R 4 ,
wherein said cellulose derivative containing amino groups has an overall degree of substitution (sum of the individual degrees of substitution) of the substituents —(CH 2 ) n —NR 1 R 2 , —R 3 and —R 4 of between 0.8 and 2.5 per anhydroglucose unit, said overall degree of substitution being determined,
by measuring the nitrogen content (for substituents —(CH 2 ) n —NR 1 R 2 ), and by means of Zeisel cleavage (for substituents —R 3 and —R 4 ).
9 . A cosmetic formulation comprising the cellulose derivative containing amino groups prepared by the method of claim 1 .
10 . An aqueous paper treatment composition comprising the cellulose derivative containing amino groups prepared by the method of claim 1.