Temporary protective coatings and methods

Patent metadata

Field	Value
Publication number	US-10975248-B2
Application number	US-201916245147-A
Country	US
Kind code	B2
Filing date	Jan 10, 2019
Priority date	Jan 10, 2019
Publication date	Apr 13, 2021
Grant date	Apr 13, 2021

Abstract

A temporary protective coating composition for providing a temporary protection to a substrate surface in need thereof. The temporary protective coating composition comprises an aqueous-soluble or alkaline-soluble polymer matrix, one or more compressible fillers, and one or more non-compressible fillers. The disclosure also provides a method for providing a temporary protective coating onto a substrate surface in need thereof for providing indentation and scratch resistance thereto.

First claim

We claim:

1. A temporary protective coating composition for protecting metal surfaces from indentation and scratching, the temporary coating composition comprising:
an aqueous soluble polymer matrix;
one or more compressible fillers; and
one or more non-compressible fillers.

2. The temporary protective coating composition of claim 1 , wherein the aqueous soluble polymer matrix is soluble in an aqueous alkaline media and removable from the metal surfaces.

3. The temporary protective coating composition of claim 1 , wherein the aqueous soluble polymer matrix comprises an acrylic polymer or copolymer.

4. The temporary protective coating composition of claim 1 , wherein the one or more compressible fillers are polymer particles present as an emulsion therein.

5. The temporary protective coating composition of claim 1 , wherein the one or more compressible fillers comprise polyolefins, thermoplastic elastomers, thermoset rubbers, polyureas, polyamides, fluoropolymers, or combinations thereof.

6. The temporary protective coating composition of claim 1 , wherein the one or more compressible fillers are polymer particles and the one or more non-compressible fillers are inorganic minerals.

7. The temporary protective coating composition of claim 6 , wherein the one or more non-compressible fillers are selected from clays, magnesium aluminum silicates, and/or calcium silicates.

8. The temporary protective coating composition of claim 6 , wherein the polymer particles are microcrystalline polyethylene and the one or more non-compressible fillers are calcium silicates.

9. The temporary protective coating composition of claim 1 , further comprising one or more of a plasticizer, a leveling agent, an organic solvent, a surfactant, a rheology modifier, a biocide, or a defoamer.

10. A method of protecting against indentation and scratching of a substrate surface in need thereof, the method comprising:
contacting a substrate surface with a protective coating comprising layer being selected independently from an aqueous coating composition comprising:
an aqueous soluble polymer matrix;
one or more compressible fillers; and
one or more non-compressible fillers; and
providing protection of the substrate surface against indentation and scratching.

11. The method of claim 10 , further comprises contacting the substrate surface with a primer coating prior to the contacting of the substrate surface with the protective coating.

12. The method of claim 10 , wherein the substrate surface comprises one or more of aluminum, painted aluminum, aluminum alloy, anodized aluminum, titanium, titanium alloy, stainless steel, carbon fiber reinforced polymer (CFRP), or epoxy carbon fiber thermoplastic composites.

13. The method of claim 10 , wherein the aqueous soluble polymer matrix is soluble in an aqueous alkaline media and removable from the metal surfaces.

14. The method of claim 10 , wherein the aqueous soluble polymer matrix comprises an acrylic polymer or copolymer.

15. The method of claim 10 , wherein the one or more compressible filler is dispersed or distributed polymer particles present as an emulsion.

16. The method of claim 15 , wherein the polymer particles comprise polyolefins, thermoplastic elastomers, thermoset rubbers, polyureas, polyamides, fluoropolymers, or combinations thereof.

17. The method of claim 10 , wherein the one or more non-compressible fillers are selected from clays, magnesium aluminum silicates, and/or calcium silicates.

18. The method of claim 10 , wherein the one or more compressible fillers are polymer particles of microcrystalline polyethylene and the one or more non-compressible fillers are calcium silicates.

19. The method of claim 10 , further comprising, after the contacting step, removing the aqueous coating composition with aqueous alkaline media.

20. An aerospace vehicle contacted at least at a portion thereof with the temporary protective coating composition, as defined in claim 1 .

Assignees

• Boeing Co

Inventors

• Zweig Andrew M
• Bruton Eric A

Classifications

• C09D133/08

  Homopolymers or copolymers of acrylic acid esters · CPC title

• C09D5/20 Primary

  for coatings strippable as coherent films, e.g. temporary coatings strippable as coherent films · CPC title

• C09D5/008

  Temporary coatings (C09D5/20 takes precedence) · CPC title

• C08K3/34

  Silicon-containing compounds · CPC title

• C09D7/61

  inorganic · CPC title