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1. (WO2001034714) SOLVENT-FREE FILM-FORMING COMPOSITIONS FOR CLEAR COATS

Pub. No.:    WO/2001/034714    International Application No.:    PCT/US2000/029388
Publication Date: Fri May 18 01:59:59 CEST 2001 International Filing Date: Thu Oct 26 01:59:59 CEST 2000
IPC: C08J 3/03
C08J 3/24
C09D 201/02
Applicants: PPG INDUSTRIES OHIO, INC.
Inventors: DAS, Suryya K.
HOGGE, Matthew F.
KILIC, Soner
NAKAJIMA, Masayuki
Title: SOLVENT-FREE FILM-FORMING COMPOSITIONS FOR CLEAR COATS
Abstract:
Film-forming compositions which are substantially free of organic solvent and capable of forming a generally continuous film at ambient temperature are provided. The film-forming composition includes at least one thermosettable aqueous dispersion of polymeric microparticles having functionality adapted to react with a crosslinking agent. The polymeric microparticles are prepared by mixing under high shear conditions (1) at least one hydrophobic polymer having reactive functional groups; and (2) at least one hydrophobic crosslinking agent containing functional groups which are reactive with the functional groups of the polymer. Further provided is a multi-component composite coating composition which includes a pigmented base coat and a transparent topcoat of the substantially organic solvent-free film-forming composition described above. Substrates coated with the same are also provided. Additionally, a method for preparing the aqueous dispersion of polymeric microparticles is provided. The substantially organic solvent-free film-forming compositions of the invention are storage stable at room temperature and provide coatings with excellent appearance and performance properties such as adhesion and scratch resistance. The film-forming compositions are suitable for wet-on-wet application over a base coat with little or no mud-cracking.