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Nuts & Bolts - Getting the Most Out of Chlorinated Polyolefin (CPO) Adhesion Promoters

SpecialChem / Jan 26, 2005

Chlorinated polyolefin (CPO) adhesion promoters are widely used as adhesion-promoting resins for coatings applied to plastic substrates, such as polypropylene (PP) and thermoplastic olefin (TPO). PP and TPO parts are used in automotive interior and exterior applications and are notoriously difficult to coat due to their low surface energy. This issue can be resolved by applying a CPO-based adhesion promoter to the plastic part before application of a coating. There are several factors that can affect the performance of a CPO-based adhesion promoter. Application parameters play a significant role in designing a system that will provide optimum adhesion performance. Of particular importance is the temperature at which a coating applied to a PP or TPO part is cured or baked. In addition, substrate and CPO composition can influence overall adhesion performance. This article will highlight the effects of coating bake temperature and adhesion promoter composition on the performance properties of coated TPO. It will also detail test results, such as gasoline resistance and peel strength, demonstrating how the two factors can affect the performance of a CPO under real-life applications.

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