Self-stratifying automotive topcoat compositions and processes

• US 7,863,375 B2
• Filed: 10/08/2008
• Issued: 01/04/2011
• Est. Priority Date: 10/08/2008
• Status: Active Grant

• Current Assignee: Eastern Michigan University, Toyota Motor Corporation
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Templeman, Cynthia Gazepis, Hernandez, Heidi Rosalia Perez, Baghdachi, Jamil
• Primary Examiner(s): Cain; Edward J
• Application Number:
  US12/247,226
• Publication Number:
  US 20100087596A1
• Time in Patent Office: 818 Days
• Field of Search: 524/714, 524/588, 524/589, 524/590, 524/728
• US Class Current: 524/714
• CPC Class Codes: C08G 18/3893 containing silicon
• CPC Class Codes: C08G 18/6275 Polymers of halogen containing compounds having carbon-to-carbon double bonds; halogenated polymers of compounds having carbon-to-carbon double bonds C08G18/6212 takes precedence
• CPC Class Codes: C08G 18/792 formed by oligomerisation of aliphatic and/or cycloaliphatic isocyanates or isothiocyanates
• CPC Class Codes: C08G 77/14 containing silicon bound to oxygen-containing groups C08G77/045 takes precedence
• CPC Class Codes: C08K 5/1535 Five-membered rings
• CPC Class Codes: C09D 175/04 Polyurethanes
• CPC Class Codes: C09D 183/04 Polysiloxanes
• CPC Class Codes: C09D 183/06 containing silicon bound to oxygen-containing groups C09D183/12 takes precedence

Abstract

A process for preparing a coating composition includes contacting a polyol, a silsesquioxane, a polyurethane dendrimer, and a crosslinker, wherein the polyol, the silsesquioxane, the polyurethane dendrimer, and the crosslinker are dispersed within a solvent and forming a self-stratifying coating. Further, a coating composition includes a polyol, a silsesquioxane, a polyurethane dendrimer and a crosslinker forming a mixture dispersed within a solvent.

Claims

1. A process for preparing a coating composition, the process comprising:

contacting a polyol, a silsesquioxane, a polyurethane dendrimer, and a crosslinker, wherein the polyol, the silsesquioxane, the polyurethane dendrimer, and the crosslinker are dispersed within a solvent; and

forming a self-stratifying coating.

2. The process of claim 1, wherein the polyol is selected from the group consisting of a fluorinated polyether polyol, a hydroxyl functional fluoroethylene-alkyl vinyl ether and a combination thereof.

3. The process of claim 1, wherein the silsesquioxane is an epoxy functional silsesquioxane having a formula (R)₆(C₆H₁₁O₂)₂(SiO_1.5)₈, wherein R is selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopentyl, cyclohexyl, benzyl, and phenyl.

4. The process of claim 3, wherein the epoxy functional silsesquioxane is a diepoxy silsesquioxane.

5. The process of claim 1, wherein the polyurethane dendrimer is derived from the group consisting of isophorone diisocyanate (IPDI), isophorone triisocyanate (IPTI), and a combination thereof.

6. The process of claim 1, wherein the crosslinker is an isocyanate-functional compound selected from the group consisting of hexamethylene diisocyanate (HDI), hexamethylene triisocyanate (HTI), methylene bis-(4-cyclohexyl isocyanate) (HMDI) and a combination thereof.

7. The process of claim 1 further comprising removing the solvent.

8. The process of claim 7, wherein the solvent is selected from the group consisting of tetrahydrofuran (THF), dimethylacetamide (DMA) and a combination thereof.

9. The process of claim 7, wherein removing the solvent comprises evaporating the solvent.

10. A coating composition comprising:

a polyol, a silsesquioxane, a polyurethane dendrimer and a crosslinker forming a mixture dispersed within a solvent.

11. The composition of claim 10, wherein the polyol is selected from the group consisting of a fluorinated polyether polyol, a hydroxyl functional fluoroethylene-alkyl vinyl ether and a combination thereof.

12. The composition of claim 10, wherein the silsesquioxane is an epoxy functional silsesquioxane having a formula (R)₆(C₆H₁₁O₂)₂(SiO_1.5)₈, wherein R is selected from the group consisting of hydrogen, methyl, ethyl, propyl, butyl, pentyl, hexyl, cyclopentyl, cyclohexyl, benzyl, and phenyl.

13. The composition of claim 12, wherein the epoxy functional silsesquioxane is a diepoxy silsesquioxane.

14. The composition of claim 10, wherein the polyurethane dendrimer is derived from the group consisting of isophorone diisocyanate (IPDI), isophorone triisocyanate (IPTI) and a combination thereof.

15. The composition of claim 10, wherein the crosslinker is an isocyanate-functional compound selected from the group consisting of hexamethylene diisocyanate (HDI), hexamethylene triisocyanate (HTI), methylene bis-(4-cyclohexyl isocyanate) (HMDI) and a combination thereof.

16. The composition of claim 10, wherein the solvent is selected from the group consisting of tetrahydrofuran (THF), dimethylacetamide (DMA) and a combination thereof.

17. The composition of claim 10, wherein the solvent is removed to form a self-stratifying coating composition.