Claims
- 1. A process for extending the life of an anti-fouling paint film which comprises applying onto an anti-fouling paint film a composition to form a protective coating consisting essentially of a graft polymer having a graft efficiency of more than 30% by weight prepared by polymerizing at least one vinyl monomer slected from the group consisting of methacrylic acid esters, acrylic acid esters, acrylonitrile, styrene, .alpha.-methyl styrene and vinyl acetate in the presence of a hydrophilic polymer selected from the group consisting of polyvinyl alcohol, polyethylene glycol, polypropylene glycol, polyvinyl pyrrolidone and their derivatives, said protective coating having a moisture permeability of 45 to 480 g.0.1 mm/m.sup.2.24 hr.cmHg.
- 2. The process of claim 1, wherein said protective coating has a water absorption of more than about 5% by weight.
- 3. The process of claim 1, wherein said vinyl monomer is employed with a minor amount of a hydrophilic vinyl monomer selected from the group consisting of acrylic acid, acrylamide, methacrylic acid, 2-hydroxyethyl methacrylate and vinyl ethers.
- 4. The process of claim 1, wherein said composition is a polymerization reaction mixture of the vinyl monomer in the presence of the hydrophilic polymer in an organic solvent selected from the group consisting of toluene, xylene, butyl acetate, methyl isobutyl ketone and mixture thereof.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of applicants' copending application Ser. No. 780,426 filed on Mar. 23, 1977 and now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3990381 |
Shepherd et al. |
Nov 1976 |
|
4021392 |
Milne et al. |
May 1977 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
780426 |
Mar 1977 |
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