Claims
- 1. A method for synthesizing water-soluble derivatives of cellulose ethers comprising reacting
- (A) 100 parts by weight of at least one water-soluble cellulose ether selected from the group comprising methylcellulose, methoxycellulose, hydroxyethylcellulose, hydroxypropylcellulose and methylhydroxypropylcellulose, with
- (B) 3 to 30 parts by weight of at least one C8-18 alkyl or alkenyl succinic anhydride, under conditions in which the reaction is:
- (1) essentially free of water;
- (2) acid or neutral;
- (3) at a temperature of 40.degree. to 150.degree. C.; and
- (4) for a period of 0.5 to 12 hours,
- wherein a high viscosity derivative is produced by reaction of about 1-8% by weight (based on the weight of the cellulose ether) of at least one succinic acid anhydride.
- 2. The method of claim 1 wherein said reaction is continued until about 3 to 6% by weight of said anhydride has reacted with said ether.
- 3. The method of claim 1 wherein said reaction temperature is in the range of about 40.degree. to 150.degree. C. and said reaction is conducted for about 0.5 to 12 hours.
- 4. The method of claim 1 wherein said reaction temperature is in the range of about 60.degree. to 110.degree. C. and said reaction is conducted for about 2 to 6 hours.
- 5. The method of claim 1 wherein said acid anhydride is present in about 5 to 25 parts by weight.
- 6. The method of claim 1 wherein at least one water-free organic solvent is present as a reaction medium.
- 7. The method of claim 1 wherein said reaction temperature is about 40.degree. to 150.degree. C. and said reaction is conducted for about 0.5 to 12 hours.
- 8. The method of claim 1 wherein said reaction temperature is about 60.degree. to 110.degree. C., said reaction is conducted for about 2 to 6 hours, said acid anhydride is present in about 5 to 25 parts by weight, and at least one water-free organic solvent is present as a reaction medium.
- 9. The method of claim 1 wherein said ether is methylcellulose and/or methylhydroxypropyl cellulose, and said acid anhydride is dodecenyl succinic acid anhydride and/or a C.sub.16-18 alkenyl succinic acid anhydride.
- 10. The method of claim 8 wherein said ether is methylcellulose and/or methylhydroxypropyl cellulose, and said acid anhydride is dodecenyl succinic acid anhydride and/or a C.sub.16-18 alkenyl succinic acid anhydride.
- 11. An acid substituted ether produced by the method of claim 1.
- 12. An acid substituted ether produced by the method of claim 1.
- 13. An acid substituted ether produced by the method of claim 2.
- 14. An acid substituted ether produced by the method of claim 7.
- 15. An acid substituted ether produced by the method of claim 8.
- 16. An acid substituted ether produced by the method of claim 9.
- 17. An acid substituted ether produced by the method of claim 10.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3620991 |
Jun 1986 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/066,374, filed 6/23/87, now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
2661349 |
Caldwell et al. |
Dec 1953 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
2063880 |
Oct 1981 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
66374 |
Jun 1987 |
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