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1. (WO2018019686) A LOW TEMPERATURE CURE COATING FORMED VIA A DOUBLE LAYER CURING MECHANISM OF A PIGMENTED WATERBORNE BASELAYER AND A SOLVENTBORNE TOP LAYER

Pub. No.:    WO/2018/019686    International Application No.:    PCT/EP2017/068289
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Fri Jul 21 01:59:59 CEST 2017
IPC: C09D 5/00
B05D 7/00
Applicants: BASF COATINGS GMBH
Inventors: DECEMBER, Timothy S.
CLARK, Timothy
OZVALD, Adam M.
Title: A LOW TEMPERATURE CURE COATING FORMED VIA A DOUBLE LAYER CURING MECHANISM OF A PIGMENTED WATERBORNE BASELAYER AND A SOLVENTBORNE TOP LAYER
Abstract:
Shelf-stable low temperature cure coating compositions that include a hydroxy-functional resin, a crosslinking agent, and a catalyst that does not catalyze the crosslinking reaction between hydroxy-functional resin and the crosslinking agent contained therein, but instead between a hydroxy-functional resin and a crosslinking agent contained in a different low temperature cure coating composition. In addition, low temperature cure composite coatings that include: a waterborne basecoat containing a first hydroxy-functional resin, a first crosslinking agent, a first catalyst, and an organic solvent; and a solventborne topcoat containing a second hydroxy-functional resin, a second crosslinking agent, a second catalyst, and water, where the first catalyst migrates into the topcoat from the basecoat and catalyzes the reaction between the second hydroxy-functional resin and crosslinking agent, and the second catalyst migrates into the basecoat from the topcoat and catalyzes the reaction between the first hydroxy-functional resin and crosslinking agent.