Process for the production of a chip resistant coating and/or a filler layer

An ecologically improved essentially solvent free process for providing chip resistant finishes on a substrate surface which comprises applying to an optionally primed substrate surface an aqueous based chip resistant coating composition over-coated with an aqueous based filler composition in a wet-on-wet application, stoving the wet-on-wet applied coatings to cure the same;

• applying a finish paint to the aforesaid coatings cured and drying the same, wherein the aqueous based chip resistant coating composition comprises:
• (A) from about 30 to 60% by weight of one or more carboxyl-containing polyesters or (meth)acrylates and copolymers thereof with vinyl compounds which, or of which the mixtures, have an average acid value of from about 30 to 100 mg KOH/g and an average OH value of from about 50 to 250 mg KOH/g and have been made soluble in water by neutralization with nitrogen bases,
• (B) from about 5 to 25% by weight of a water-soluble or water-dispersible, blocked isocyanate prepolymer of which from about 1 to 80% by weight may be replaced by a water-soluble amine resin,
• (C) from about 15 to 30% by weight water, and
• (D) from about 10 to 50% by weight pigments and/or fillers and/or standard paint auxiliaries and additives.

An ecologically improved essentially solvent free process for providing chip resistant finishes on a substrate surface by applying to an optionally primed substrate surface an intermediate aqueous based chip resistant coating in conjunction with conventional water based filler and finishing paint coatings, wherein said aqueous based chip resistant coating composition comprises:

• (A) from about 30 to 60% by weight of one or more carboxyl-containing polyesters or (meth)acrylates and copolymers thereof with vinyl compounds which, or of which the mixtures, have an average acid value of from about 30 to 100 mg KOH/g and an average OH value of from about 50 to 250 mg KOH/g and have been made soluble in water by neutralization with nitrogen bases,
• (B) from about 5 to 25% by weight of a water-soluble or water-dispersible, blocked isocyanate prepolymer of which from about 1 to 80% by weight may be replaced by a water-soluble amine resin,
• (C) from about 15 to 30% by weight water, and
• (D) from about 10 to 50% by weight pigments and/or fillers and/or standard paint auxiliaries and additives,
• said process comprising the steps of:
• i. applying said aqueous based chip resistant coating to a substrate surface;
• ii. overcoating said wet chip resistant coating with an aqueous based filler in a wet-on-wet application;
• iii. stoving the wet-on-wet chip resistant and filler coatings together to cure the same;
• iv. overcoating the cured coatings with a finishing paint and drying the same.