The relationship between clearcoat permeability and adhesion promoter penetration to the gasoline resistance of painted TPO substrates

Adhesion of topcoats to a variety of painted thermoplastic olefin (TPO) substrates, varying in the ratio of poly(propylene) to elastomer components, was determined in the presence of gasoline. Adhesion to TPO substrates was achieved through the use of chlorinated polyolefin (CPO) adhesion promoters....

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Bibliographic Details
Published in:Progress in organic coatings 1997-12, Vol.32 (1), p.167-172
Main Authors: Ryntz, Rose A, Buzdon, Branka
Format: Article
Language:English
Subjects:
Adhesion promoter
Applied sciences
Chlorinated polyolefin
Coatings. Paints, varnishes and inks
Exact sciences and technology
Film formation and curing, properties, testing
Gasoline
Polymer industry, paints, wood
Thermoplastic olefin
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Summary:Adhesion of topcoats to a variety of painted thermoplastic olefin (TPO) substrates, varying in the ratio of poly(propylene) to elastomer components, was determined in the presence of gasoline. Adhesion to TPO substrates was achieved through the use of chlorinated polyolefin (CPO) adhesion promoters. The adhesion promoter utilized in this study was a solventborne thermoplastic CPO, the penetration of which into the TPO substrate was monitored through the use of fluorescent tagging and subsequent optical microscopy. The topcoats utilized consisted of both one-component (1K) melamine crosslinked systems as well as two-component (2K) isocyanate crosslinked systems. Ultimate adhesion of the coatings in the presence of gasoline was found to be directly proportional to the depth of the CPO adhesion promoter diffusion into the substrate as well as the resistance of the clearcoat to gasoline permeation. Methods of analysis and supporting data are presented.
ISSN:0300-9440
1873-331X
DOI:10.1016/S0300-9440(97)00008-8