Surviving the elements with Capa™ 4101

Capa, Coatings
8 February 2018

Capa™ 4101 is a unique polyol that has been developed for industrial coatings in applications that are exposed to high demands and extreme weather, such as wind turnbines, trains and airplanes. Pär Jörgensen, Technical Market Development Manager at Perstorp, explains how Capa™ 4101 can help improve a coating’s impact resistance and chemical resistance, and provide outstanding durability that can withstand the toughest conditions.

aeroplane in tough conditions

What distinguishes Capa™ 4101 from the rest of the Capa™ range?


Like all Capa™ polyols, Capa™ 4101 is made through highly controlled ring-opening polymerisation and in this case, it is initiated by a tetrol which results in a very well-defined functionality of 4. This high, precise functionality, in combination with the well-defined molecular structure, makes it unique on the market. Since it is liquid and solvent free, it combines low VOC and high crosslink density in a coating formulation.

What does this mean for coatings?


This specific functionality makes Capa™ 4101 a very accurate tool for modifying the properties of the coating and, by adding Capa™ 4101, you can improve several mechanical properties such as impact resistance, scratch resistance, abrasion resistance and chemical resistance. Capa™ 4101 also has a low Tg, which means it stays flexible at very low temperatures. Overall, it offers good mechanical properties over a wide temperature range.

How should Capa™ 4101 be used in coating formulations?


By using just a small amount of Capa™ 4101, significant improvements in coating properties can be obtained. It can be used as a resin modifier in a conventional formulation, when partly replacing the conventional acrylic or polyester. Just by replacing a small amount of the conventional polyol with Capa™ 4101 – around 2 to 12 percent – will be enough to dramatically improve the properties of your formulation.

For which applications is Capa™ 4101 best suited?


Capa™ 4101 is ideal for 2K polyurethane applications and coatings. A typical application area in which it is well suited is aerospace coatings, as they are exposed

to a wide range of temperatures and extreme impacts. From being 10,000 feet in the air, where it is -45°C, to then landing in a desert, where it could be over 50°C.

In general, however, Capa™ 4101 is a unique and versatile product that can be used in many different types of industrial coating application area, such as windmill blades, automobiles and trains.

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