Claims
- 1. A method for treating paper which comprises applying to the surface of the paper an aqueous 1-15 wt % polyvinyl alcohol sizing composition consisting essentially of 75-99.9 wt % polyvinyl alcohol which is at least 95 mole % hydrolyzed and 0.1-25 wt % ketene dimer.
- 2. The method of claim 1 in which the sizing composition is applied at 1-10 g/m.sup.2.
- 3. The method of claim 1 in which the ketene dimer is represented by the formula: ##STR3## wherein R and R.sup.1 are the same or different hydrocarbyl groups having 8-30 carbon atoms.
- 4. The method of claim 2 in which R and R.sup.1 are the same or different C.sub.8 -C.sub.30 alkyl groups.
- 5. The method of claim 1 in which the polyvinyl alcohol is at least 98 mole % hydrolyzed.
- 6. The method of claim 1 in which the polyvinyl alcohol has a degree of polymerization of 100-3000.
- 7. The method of claim 1 in which the polyvinyl alcohol sizing composition consists essentially of 97-99 wt % polyvinyl alcohol and 1-3 wt % ketene dimer.
- 8. The method of claim 1 in which the aqueous polyvinyl alcohol sizing composition is prepared by blending an aqueous polyvinyl alcohol mixture and an aqueous ketene dimer composition.
- 9. A method for treating paper which comprises applying an aqueous 1-15 wt % polyvinyl alcohol sizing composition to the surface of the paper to provide 1-10 g/m.sup.2 of the sizing composition which consists essentially of 75-99.9 wt % polyvinyl alcohol which is at least 98 mole % hydrolyzed and has a degree of polymerization of 100-3000 and 0.1-25 wt % ketene dimer which is represented by the formula: ##STR4## wherein R and R.sup.1 are the same or different hydrocarbyl groups having 8-30 carbon atoms.
- 10. The method of claim 9 in which the sizing composition is applied at 2-5 g/m.sup.2 and consists essentially of 97-99 wt % polyvinyl alcohol which is at least 98 mole % hydrolyzed and has a degree of polymerization of 300-2500 and 1-3 wt % ketene dimer in which R and R.sup.1 are the same or different C.sub.8 -C.sub.30 alkyl groups.
- 11. The method of claim 10 in which the polyvinyl alcohol is about 99.3 mole % hydrolyzed.
- 12. The method of claim 9 in which the sizing composition is applied as an aqueous solution containing 3 to 8 wt % of the sizing composition.
- 13. The method of claim 10 in which the sizing composition is applied as an aqueous solution containing 3 to 8 wt % of the sizing composition.
- 14. The method of claim 9 in which the aqueous polyvinyl alcohol sizing composition is prepared by blending an aqueous polyvinyl alcohol mixture and an aqueous ketene dimer composition.
- 15. An aqueous 1-15 wt % polyvinyl alcohol surface sizing composition consisting essentially of 75 to 99.9 wt % polyvinyl alcohol which is at least 95 mole % hydrolyzed and 0.1 to 25 wt % ketene dimer represented by the formula: ##STR5## wherein R and R.sup.1 are the same or different hydrocarbyl groups having 8-30 carbon atoms.
- 16. The composition of claim 15 in which R and R.sup.1 are the same or different C.sub.8 -C.sub.30 alkyl groups.
- 17. The composition of claim 16 in which the polyvinyl alcohol is at least 98 mole % hydrolyzed.
- 18. The composition of claim 17 in which the polyvinyl alcohol has a degree of polymerization of 100-3000.
- 19. The composition of claim 15 in which the sizing composition consists essentially of 97-99 wt % polyvinyl alcohol and 1-3 wt % ketene dimer.
- 20. The composition of claim 15, in which the sizing composition consists essentially of 97-99 wt % polyvinyl alcohol which is at least 98 mole % hydrolyzed and has a degree of polymerization of 300-2500 and 1-3 wt % ketene dimer in which R and R.sup.1 are the same or different C.sub.8 -C.sub.30 alkyl groups.
- 21. The composition of claim 20 in which the polyvinyl alcohol is about 99.3 mole % hydrolyzed.
- 22. The aqueous polyvinyl alcohol sizing composition of claim 15 which is prepared by blending an aqueous polyvinyl alcohol mixture and an aqueous ketene dimer composition.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation of application Ser. No. 08/054,659 filed 23 Apr. 1993 which is a continuation-in-part of application Ser. No. 08/017,050 filed 12 Feb. 1993 both now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (4)
Number |
Date |
Country |
45-33189 |
Oct 1970 |
JPX |
60-17198 |
Jan 1985 |
JPX |
60-246896 |
Dec 1985 |
JPX |
1457428 |
Dec 1976 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
54659 |
Apr 1993 |
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Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
17050 |
Feb 1993 |
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