Some content of this application is unavailable at the moment.
If this situation persist, please contact us atFeedback&Contact
1. (WO2007108905) LIQUID COMPOSITION TO GENERATE A REMOVABLE TEMPORARY PROTECTION FILM, BASED ON AQUEOUS DISPERSIONS OF POLYURETHANE
Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

What is claimed is:

1. A liquid composition that provides a removable film for temporary protection, which comprises an aqueous dispersion of functionalized polyurethane resin, a release agent and a cross-linking agent.

2. The liquid composition, according to claim 1, characterized in that its polyurethane resin is aliphatic and it is derived from polyester or polyether or it has polycarbonate material in its structure.

3. The liquid composition, according to claim 1, characterized in that its polyurethane is an aqueous dispersion with a solids content of from 25 to 55 % by weight.

4. The liquid composition, according to claim 1, characterized in that the polyurethane dispersion content in the liquid composition varies in a range of from 50 to 100 % by weight, based on the total weight of the liquid composition.

5. The liquid composition, according to claim 1, characterized in that its polyurethane resin is functionalized with carboxyl groups along its polymeric chain.

6. A removable temporary coating obtained from a liquid composition according to claim 1, characterized in that it resists chemical substances such as isopropanol, turpentine oil, gasoline and greases.

7. A removable temporary coating obtained from a liquid composition according to claim 1, characterized in that it is resistant to water and salt water.

8. A removable temporary coating obtained from a liquid composition according to claim 1 , characterized in that it does not show fractures or cracking when it is exposed to water or a corrosive environment.

9. The liquid composition according to claim 1, characterized in that it can be applied by spraying, atomization, brush, roller or immersion methods, and other traditional coating methods.

10. The liquid composition according to claim 1, characterized in that its release agents are selected from the group consisting of: pentaerythritol, glycerin, an emulsion of oxidized polyethylene wax, poly(tetrafluoroethylene) emulsions, mixtures of polyethylene and poly(tetrafiuorόethylene), diglycerol, triglycerol, polyethylene glycol, ethers and esters of ethylene glycol, beaver oil, polydimethylsiloxanes, and ethoxylated polydimethylsiloxanes.

11. The liquid composition according to claim 1, characterized in that its release agent is present in an amount between 0.2 and 50 % by weight based on the total weight of the liquid composition.

12. The liquid composition according to claim 1, characterized in that its cross-linking agent is selected from the group consisting of: melamines, aziridines, epoxysilanes, carbodiimides, or polyurethanes, preferably the polyaziridine and/or the methyl glycidoxypropyl diethoxy silane.

13. The liquid composition according to claim 1, characterized in that its cross-linking agent is present in an amount between 1 and 10 % by weight based on the total content of solids of the polyurethane dispersion.

14. The liquid composition according to claim 1, characterized in that its additive is a stabilizer agent against ultraviolet light, and it is present in an amount from 0.1 to 7 % by weight based on the content of solids of polyurethane dispersions.

15. The liquid composition according to claim 1, characterized in that its content of thickening agent is between 0.01 % to 1 % by weight based on the total weight of the of the liquid composition.

16. The liquid composition according to claim 1, characterized in that its filler agent is selected from the group consisting of: talc and polymeric microspheres.

17. The use of the liquid composition according to claim 1, to provide a temporary protective film for polymeric materials against light scratching, some chemical products, dust, and water.

18. The liquid composition according to claim 1, characterized in that it is capable to providing a flexible film for the temporary protection of a substrate, wherein film exhibits easy removal from the substrate, and a service temperature of -30 °C to 90 0C.

19. The use of the liquid composition according to claim 1, to provide a temporary protective film for metallic pieces against light scratches, some chemical products, dust, and water.

20. The use of the liquid composition according to claim 1, to provide a temporary protective film for wooden items, wherein said wooden items may further comprise a coating of paint or varnish.

21. The use of the liquid composition according to claim 1, to provide a temporary protective film for metallic materials, for protection against corroding environments.

22. The use of the liquid composition according to claim 1, characterized in that it can be applied to either polymeric, metallic, ceramic or glass pieces or items, with either curved or non flat shapes, by the use of methods such as spraying, atomization, brush or roller.

23. A removable temporary coating obtained from a liquid composition according to claim 1, characterized in that it can be removed easily, and without leaving any material on a substrate having a flat or curved shape.

24. The liquid composition according to claim 1, characterized in that the proportions of its components can be modified in order to provide a film whose peel strength is in the range of from 6 to 800 grams per inch, with 2.54 width samples.