Method for forming multilayer coating film
US10773276B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 29, 2018 |
| Grant date | Sep 15, 2020 |
| Priority date | — |
| Expiry date | May 10, 2038 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25D13/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The coating film formed on an automobile body has softness during a film formation even on a thermally expandable/shrinkable base, and the cured film has an excellent appearance.Provided is a method for forming a multilayer coating film, the method comprises: applying an aqueous intermediate coating composition and preheating the applied composition at 60 to 90° C. to form an uncured film;preheating to form an uncured base coating film and a clear coating film; andbaking and curing these uncured films to form a multilayer coating film,wherein the aqueous intermediate coating composition comprises (a) an acrylic resin emulsion having a specific properties, and (b) a film formation auxiliary agent that is a fatty acid diester compound having a boiling point of 280° C. to 350° C., anda cured film comprising (a) and (b) at a mass ratio of 3:1 has a rupture elongation of 1% or more.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.