Claims
- 1. A mixture of (a) a ring-opened aziridinyl homopolymer of an aziridinyl monomer corresponding to the formula ##EQU6## and (b) cationic starch, wherein: X is oxygen or amido nitrogen, R.sub.1 and R.sub.2 are hydrogen or lower alkyl of from 1 to 4 carbon atoms, R.sub.3 is hydrogen or methyl and R.sub.4 is an organic hydrophobic group.
- 2. The mixture defined in claim 1 wherein R.sub.1 is hydrogen and R.sub.2 is hydrogen, methyl or ethyl.
- 3. The mixture defined in claim 2 wherein R.sub.2 is hydrogen.
- 4. The mixture defined in claim 1 wherein X is oxygen.
- 5. The mixture defined in claim 1 wherein R.sub.4 is hydrocarbyl of from about 8 to about 24 carbon atoms.
- 6. The mixture defined in claim 5 wherein R.sub.4 is alkyl of from 16 to 20 carbon atoms.
- 7. The mixture defined in claim 6 wherein R.sub.3 is hydrogen.
- 8. The mixture defined in claim 6 wherein R.sub.4 is a straight chain alkyl of 18 carbon atoms; X is oxygen and R.sub.1 and R.sub.2 are each hydrogen and (a) is a polymer of (I).
- 9. The mixture defined in claim 6 wherein R.sub.4 is a straight chain alkyl of 17 carbon atoms; X is oxygen; R.sub.1 and R.sub.2 are each hydrogen and (a) is a polymer of (IV).
- 10. The mixture defined in claim 1 wherein the weight ratio of (b) to (a) is from about 0.5 to about 4.
- 11. The mixture defined in claim 10 wherein said ratio is from about 1 to about 2.
- 12. An aqueous emulsion of the mixture defined in claim 1.
- 13. The mixture defined in claim 1 wherein the homopolymer (a) has from 2 to about 30 ring-opened aziridine units in the backbone.
- 14. The mixture defined in claim 1 wherein the homopolymer (a) is predominantly a mixture of cyclic oligomers.
- 15. In the process of sizing cellulosics, the improvement consisting of applying to a cellulosic, in an amount sufficient to size same, a sizing agent comprising a ring-opened aziridinyl homopolymer of an aziridinyl monomer corresponding to the formula ##EQU7## wherein: X is oxygen or amido nitrogen, R.sub.1 and R.sub.2 are hydrogen or lower alkyl of from 1 to 4 carbon atoms, R.sub.3 is hydrogen or methyl and R.sub.4 is an organic hydrophobic group.
- 16. The process of claim 15 wherein the sizing agent further comprises cationic starch.
- 17. A cellulosic sizing composition comprising the mixture defined in claim 1.
- 18. A cellulosic sized by the process described in claim 16.
- 19. Paper or paperboard sized by the process described in claim 16.
- 20. The improvement defined in claim 19 wherein said cellulosic is paper or paper pulp.
- 21. The improvement defined in claim 20 wherein said cellulosic is paper pulp; and wherein a mixture of said homopolymer and said cationic starch is admixed with said pulp in amounts of up to about 25 pounds per ton of dry pulp.
- 22. The improvement defined in claim 21 wherein said mixture is present in amounts of from about 2 to about 10 pounds per ton of dry pulp.
- 23. The process of claim 18 wherein said cellulosic is paper or paper pulp.
- 24. The process of claim 23 wherein said cellulosic is paper pulp and wherein said homopolymer is admixed with said pulp in amounts of from about 5 to about 25 pounds per ton of dry pulp.
- 25. The process of claim 18 wherein said homopolymer is a cyclic oligomer having from 2 to about 6 ring-opened units of (IV).
- 26. The process of claim 25 wherein R.sub.1, R.sub.2 and R.sub.3 are hydrogen, R.sub.4 is alkyl of from about 8 to about 24 carbon atoms, and X is oxygen.
- 27. The process of claim 18 wherein R.sub.1 and R.sub.2 are hydrogen, R.sub.4 is alkyl of from about 8 to about 24 carbon atoms and X is oxygen.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of applicants' copending applications Ser. No. 180,234, filed Sept. 13, 1971; Ser. No. 323,373, filed Jan. 15, 1973; and Ser. No. 323,374, filed Jan. 15, 1973 all now abandoned.
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
Dermer & Ham, "Ethylenimine and Other Aziridines" Academic Press, (1969), pp. 133, 160, 161. |
Related Publications (2)
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Number |
Date |
Country |
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323373 |
Jan 1973 |
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323374 |
Jan 1973 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
180234 |
Sep 1971 |
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