Claims
- 1. A water insoluble, hydrophilic, water swellable hydroxy C.sub.2 -C.sub.4 alkylated cross-linked regenerated cellulose prepared from the reaction of up to 20% (V/W based on cellulose) cross-linking agent comprising a bifunctional compound of formula XRY wherein X and Y which may be the same or different is each halo or epoxy and R is an aliphatic residue, up to 100% (V/W based on cellulose) hydroxy C.sub.2 -C.sub.4 alkylating agent and regenerated cellulose.
- 2. The product of claim 1 wherein said cross-linking agent is epichlorohydrin.
- 3. The product of claim 2 wherein said hydroxy C.sub.2 -C.sub.4 alkylating agent is selected from the group consisting of ethylene oxide and propylene oxide.
- 4. The product of claim 2 wherein said hydroxy C.sub.2 -C.sub.4 alkylating agent is propylene oxide.
- 5. The product of claim 4 wherein the particle size of the regenerated cellulose starting material is between 50-75.mu..
- 6. The product of claim 1 prepared using 2-8% (V/W based on cellulose) epichlorohydrin and 50% (V/W based on cellulose) propylene oxide.
- 7. A process for preparing a water insoluble, hydrophilic water swellable hydroxy C.sub.2 -C.sub.4 alkylated cross-linked regenerated cellulose which comprises mixing regenerated cellulose in an aqueous alkaline medium with up to 20% (V/W based on cellulose) of a cross-linking agent comprising a bifunctional compound of formula XRY wherein X and Y which may be the same or different is each halo or epoxy and R is an aliphatic residue, up to 100% (V/W based on cellulose) of an hydroxy C.sub.2 -C.sub.4 alkylating agent with agitation or stirring until substantially all swelling is completed and substantially all liquid absorbed, sealing the swollen mixture in a closed vessel and heating the mixture to an elevated temperature in excess of the boiling temperature of said hydroxy C.sub.2 -C.sub.4 alkylating agent and maintaining the mixture in excess of said boiling temperature until said reaction is substantially complete, and recovering the product from said vessel.
- 8. The process according to claim 7 wherein said aqueous alkaline solution is a dilute sodium hydroxide solution, said cross-linking agent is epichlorohydrin, said hydroxy C.sub.2 -C.sub.4 propylating agent is propylene oxide and said elevated temperature is about 60.degree. C.
- 9. The process of claim 8 wherein from 2-8% epichlorohydrin and 40-50% propylene oxide are employed.
- 10. The process of claim 8 wherein the regenerated cellulose used has a particle size between 50-75.mu..
- 11. A process for preparing a water insoluble, hydrophilic water swellable hydroxy C.sub.2 -C.sub.4 alkylated cross-linked regenerated cellulose which comprises mixing cross-linked regenerated cellulose in an aqueous alkaline medium with up to 100% (V/W based on cellulose) of an hydroxy C.sub.2 -C.sub.4 alkylating agent with agitation or stirring until substantially all swelling is completed and substantially all liquid absorbed, sealing the swollen mixture in a closed vessel and heating the mixture to an elevated temperature in excess of the boiling temperature of said hydroxy C.sub.2 -C.sub.4 alkylating agent and maintaining the mixture in excess of said boiling temperature until said reaction is substantially complete, and recovering the product from said vessel.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of U.S. application Ser. No. 773,269 filed on Mar. 1, 1977.
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Name |
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2173471 |
Broderick |
Sep 1939 |
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3573277 |
Grant |
Mar 1971 |
|
3652540 |
Determann et al. |
Mar 1972 |
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973952 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
773269 |
Mar 1977 |
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