Patent · US Expired

Process for the production of multi-layer coatings comprising a waterborne primer-surfacer layer and a topcoat applied thereto

US7166331B2 · kind B2 · utility

1Cited by

7References

7Claims

0Family size

Assignee

E.I. DU PONT DE NEMOURS AND COMPANY · US

Inventors

Michael Becker · East Lansing, US
Werner Bosch · Wuppertal, DE
Thimo Lothert · Wuppertal, DE

Key dates

Filing date	May 10, 2004
Grant date	Jan 23, 2007
Priority date	—
Expiry date	May 25, 2024

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G18/4288
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

A process for producing multi-layer coatings comprising a waterborne primer-surfacer layer and a topcoat applied thereto on substrates, in which a waterborne primer-surfacer layer is applied from a waterborne primer-surfacer to substrates and baked and then a topcoat is applied, wherein the waterborne primer-surfacer has a binder solids content with a hydroxyl number of 100 to 250 mg KOH/g and contains free or blocked polyisocyanate as a curing agent (crosslinking agent) for the hydroxy-functional binder(s) in a molar ratio of OH/NCO of more than 2:1 to 5:1, and wherein, after it has been applied and before baking, the waterborne primer-surfacer layer is allowed to evaporate for 30 to 300 seconds at 15 to 40° C.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.