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Sumitomo introduces three new PES grades to paint, coatings formulators
Source:Adsale Plastics Network    Editor:(SC)    Date:16.Jan.2020

To support the paint and coatings industry, Sumitomo Chemical Advanced Technologies LLC has introduced three new Polyethersulfone (PES) grades to meet the needs of formulators.


SumikaExcel 4100P is the standard coating grade and 4100MP is the same material but is offered ground to a micron-powder, which enhances solubility and dispersion.


A third grade, SumikaExcel 5003PS has been chemically modified to possess a large number of hydroxyl (-OH) end groups — on average 0.6-1.4 per 100 repeating polymer units — which, in turn, can be used to create cross-linked structures that further increase the material’s already-good chemical resistance, surface hardness, and adhesion to metals. 

That makes it ideal for use for paint and coatings requiring higher performance in more aggressive environments.


PES is an amber-transparent, amorphous engineering thermoplastic known for its high mechanical properties, including high strength and impact resistance, low creep even at elevated temperatures and loads. 


It also offers excellent thermal stability. Additionally, the material meets all U.S. Food & Drug Administration (FDA) requirements for food-contact applications and does not support microbial growth.


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PES has long been used — alone and in combination with other polymers, such as PTFE — as the base for non-stick cooking surfaces for housewares. 


Since PES also has an ability to modify the surface properties of substrates, it not only adheres well to the substrate material itself, but it functions as a binder to ensure that other components in the paint/coating also bond to the substrate.


That makes PES highly desirable as a corrosion-protection coating for metals in the oil & gas industry and for non-stick surfaces (in combination with fluoropolymers like polytetrafluoroethylene (PTFE)) for cookware.


In the non-stick cookware segment, which is growing in popularity with new appliances such as air fryers, PES often competes with polyamideimide (PAI), polyphenylene sulfide (PPS), and polyetherimide (PEI). Versus thermoset PAI, PES is more affordable and far easier to process.


Sumitomo offers PES in pelletized form for injection molding, extrusion, and film processes, and in powder form for cast films, filtration membranes, adhesives, and as an impact-modifier for carbon fiber-reinforced epoxy composites.

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