Method for forming multilayer coating films wherein the basecoat film comprises acrylic, polyester and melamine resins, carbodiimide and urethane thickeners
US9376574B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 21, 2009 |
| Grant date | Jun 28, 2016 |
| Priority date | — |
| Expiry date | May 13, 2032 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05D7/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention relates to a method for producing a multilayer coating film, which comprises steps of applying a waterborne intermediate coating composition on an electrodeposited coating film to form an intermediate coating film; applying a waterborne base coating composition on the intermediate coating film to form a base coating film; applying a clear coating composition on the base coating film to form a clear coating film; and simultaneously baking and curing the intermediate coating film, the base coating film applied thereon, and the clear coating film further applied thereon in order to form a multilayer coating film, wherein the waterborne intermediate coating composition comprises an emulsion of a hydroxyl group-containing acrylic resin comprising 27 to 65% by weight of a styrene monomer, wherein the emulsion has a water-tolerance within a range of from 0.2 to 5 and a hexane-tolerance within a range of from 5 to 25; a hydroxyl group-containing polyester resin; a melamine resin; a carbodiimide; and an associative thickener, wherein the associative thickener comprises an urethane compound (A) represented by the formula (1), and an urethane compound (B) represented by …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.