Claims
- 1. A method of coating paper to improve the surface strength and printability of the paper, comprising applying an effective amount of a silicon-containing modified polyvinyl alcohol to said paper in the form of an alkaline aqueous solution, wherein the silicon-containing modified polyvinyl alcohol is a water soluble product obtained by an alcoholysis of a copolymer of a vinyl ester and an olefinic unsaturated monomer containing silicon in the molecule.
- 2. The method of claim 1, wherein the olefinic unsaturated monomer containing silicon in the molecule is represented by the formula (I): ##STR19## wherein n is 0 to 4,
- m is 0 to 2,
- R.sup.1 is a non-hydrolyzable group, and
- R.sup.2 is a hydrolyzable group.
- 3. The method of claim 2, wherein
- R.sup.1 is aryl or lower alkyl which may be substituted by aryl; and
- R.sup.2 is alkoxyl or acyloxyl which may have a substituent group containing oxygen or nitrogen.
- 4. The method of claim 2, wherein
- R.sup.1 is C.sub.6 -C.sub.18 aryl or C.sub.1 -C.sub.5 lower alkyl, which may be substituted by C.sub.6 -C.sub.18 aryl; and
- R.sup.2 is alkoxyl or acyloxyl of 1 to 40 carbon atoms which may have a substituent containing oxygen or nitrogen.
- 5. The method of claim 2, wherein
- m and n are 0 and 0 to 4, respectively; and
- R.sup.2 is C.sub.1 -C.sub.40 alkoxyl.
- 6. The method of claim 2, wherein
- both m and n are 0; and
- R.sup.2 is C.sub.1 -C.sub.18 alkoxyl.
- 7. The method of claim 2, wherein
- m and n are 0 and 0 to 4, respectively, and
- R.sup.2 is C.sub.2 -C.sub.18 acyloxyl.
- 8. The method of claim 1, wherein the olefinic unsaturated monomer has the formula (II): ##STR20## wherein m is 0 to 2;
- R.sup.1 is a non-hydroylzable group;
- R.sup.2 is a hydrolyzable group;
- R.sup.3 is hydrogen or methyl;
- R.sup.4 is hydrogen or C.sub.1 -C.sub.5 alkyl; and
- R.sup.5 is C.sub.1 -C.sub.5 alkylene or an organic divalent residue wherein the carbon chain is interrupted by an oxygen atom or nitrogen atom.
- 9. The method of claim 8, wherein
- R.sup.1 is an aryl group or lower alkyl which may be substituted by aryl; and
- R.sup.2 is alkoxyl or acyloxyl which may have a substituent containing oxygen or nitrogen.
- 10. The method of claim 8, wherein
- R.sup.1 is C.sub.6 -C.sub.18 aryl or C.sub.1 -C.sub.5 alkyl which may be substituted by C.sub.6 -C.sub.18 aryl; and
- R.sup.2 is alkoxyl or acyloxyl of 1 to 40 carbon atoms which may have a substituent containing oxygen or nitrogen.
- 11. The method of claim 8, wherein
- m is 0;
- R.sup.1 is C.sub.1 -C.sub.5 alkyl;
- R.sup.2 is C.sub.1 -C.sub.40 alkoxyl;
- R.sup.3 is hydrogen or methyl;
- R.sup.4 is hydrogen or methyl; and
- R.sup.5 is C.sub.1 -C.sub.5 branched or unbranched alkylene.
- 12. The method of claim 1, wherein the modified polyvinyl alcohol contains the silicon-containing monomer unit in an amount of 0.01 to 10 mol%.
- 13. The method of claim 1, wherein the modified polyvinyl alcohol contains the silicon-containing monomer unit in an amount of 0.1 to 3 mol%.
- 14. The method of claim 1, wherein the modified polyvinyl alcohol has
- a degree of polymerization of 100 to 3000, and
- a degree of saponification of 70 to 100 mol%.
Priority Claims (3)
Number |
Date |
Country |
Kind |
56-158974 |
Oct 1981 |
JPX |
|
56-160658 |
Oct 1981 |
JPX |
|
57-46676 |
Mar 1982 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 429,231, filed Sept. 30, 1982, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3408420 |
Wiggill |
Oct 1968 |
|
4219591 |
Buning et al. |
Aug 1980 |
|
4276389 |
Wieder et al. |
Jun 1981 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
429231 |
Sep 1982 |
|