Dedicated products
Perstorp has developed a number of intermediates for use in waterborne coatings. These include a number of raw materials for producers of waterborne polyesters and polyurethane dispersions, as well as niche resins and additives for coating formulators.

Some of the Perstorp products for waterborne are:
Bis-MPA - dispersing monomer for polyurethane dispersions (PUDs) and waterborne polyesters.
Oxymer™ range- polycarbonate diols for PUD.
BEPD and Neo- glycols for waterborne polyesters.
Boltorn® W3000- an emulsifying resin for making waterborne paints.
NX 795 and NX 800- coalescing agents for aqueous latex dispersions.

Bis-MPA
Perstorp is the leading supplier of Bis-MPA (2,2,-dimethylolpropionic acid) which is the anionic monomer of choice when preparing polyurethane dispersions for wood and other industrial coatings, as well as for leather and textile surface finishes. Bis-MPA is a critical raw material in this application area because of its ability to enable polyurethane oligomers to be dispersed in water.

It is a crystalline, high-melting point solid containing two primary hydroxyl groups and one tertiary carboxyl group as shown below.

Waterborne polyesters
The tertiary carboxylic acid group of Bis-MPA is not only suitable for PUD production, but also for preparing waterborne polyesters. Linear or branched polyesters can easily be prepared by direct esterification, where Bis-MPA is incorporated as a diol with pendant carboxy groups into the polyester backbone. As continuous product improvement is a major goal at Perstorp, we are also currently developing novel dispersion monomers that could complement Bis-MPA in some applications to enhance end-product performance.

Oxymer™
Polycarbonate diols for PUD Perstorp’s new Oxymer™ range of OH-functional raw materials for waterborne coatings applications has recently been introduced to the market. They consist of polycarbonate diols based on captive glycol technology.

These macrodiols will be offered with different molecular weights and compositions to ensure that different customer needs, such as the right balance between different film hardness, flexibility, adhesion and general mechanical performance, are met.

BEPD and Neo
Glycols for waterborne polyesters BEPD (2-butyl, 2-ethyl propanediol) is an asymmetric, hydrophobic glycol giving outstanding hydrolytic resistance to polyester resins and coatings. It is a solid amorphous (semi-crystalline) diol that melts easily. The pendant hydrophobic groups coupled with the glycol structure further give a unique balance between flexibility and film hardness as well as low viscosity of the polyester resin. This polyalcohol is FDA-approved as a diol for waterborne polyesters used for internal can coating applications. Neo is a chain extender used together with BEPD, and it is the main diol in saturated polyesters for powder coatings where it gives good crystallinity as well as the desired coating properties. Neo is also used in liquid saturated polyesters for coatings and polyurethanes. In unsaturated polyesters, mainly gel coats, Neo improves water and chemical resistance. The product is a white crystalline polyhydric alcohol containing two primary hydroxyl groups.

Boltorn®
Dendritic polymers for waterborne coatings Since the early 1990’s, Perstorp has taken the lead in bringing cost-effective dendritic polymers to the market for a number of applications. Our dendritic polymers are collectively sold under the Boltorn® trademark.

Now we have modified the structure of our dendritic polymers to meet the needs of waterborne coatings technology, thereby offering new opportunities to producers of waterborne paints.

Boltorn® W3000
An emulsifying air-drying resin for converting solventborne alkyds into alkyd emulsions Dendritic polymers offer extensive design possibilities. With Boltorn® W3000 we have been able to develop an amphiphilic dendritic structure that contains both non-ionic water-dispersible groups as well as hydrophobic air-drying groups. The result is a powerful emulsifying resin that enables traditional high molecular weight solventborne alkyds to be easily converted to their waterborne equivalents.

The combination of high dispersing efficiency and high reactivity of Boltorn® W3000 allows the production of alkyd emulsion-based paints with exceptionally fast drying rates. 

Coalescing agents
Perstorp offers two high-performance coalescing agents, NX 795 and our latest product, NX 800. Both products are non-VOC compliant according to European legislation. NX 795 and NX 800 effectively reduce the minimum film-formation temperature (MFFT), and they provide other benefits regarding the properties of the end product like higher coating gloss and film integrity, as well as reduced film porosity and less cracking.

NX 795
Coalescing agent for aqueous latex dispersions NX 795 is an ester alcohol that acts as an effective coalescing agent for a number of different latex paint formulations such as acrylic dispersions, styrene acrylics and vinylacetete co-polymer dispersions. By adding NX 795, the minimum film-formation temperature of the dispersion paint is reduced. NX 795 has a boiling point of 254 °C and is not classified as a HAP substance.

NX 800
Coalescing agent for aqueous latex dispersions NX 800 satisfies customer demands for a low-odor coalescing agent without compromising performance and while still complying with the EU VOC directive for decorative paints. It has a boiling point of 282 °C.

For more details – take a look at our new Waterborne coatings brochure >>