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Bayer's MaterialScience's new nomenclature for waterborne polymer dispersions

By Tim Wright

Published April 1, 2009
Bayer MaterialScience AG has introduced a new nomenclature system for the Bayhydrol product line and is presenting this system and numerous new products for the first time at the European Coatings Show (ECS). At the core of the development concept for the Bayhydrol line of products is the greatest possible substitution of solvents and cosolvents by water. This objective is reflected in Bayer MaterialScience's motto for this year's ECS: "Water is green." This pertains not only to the products themselves, but also to their raw materials and the production and application processes. One example of this is the universal acetone process for the production of cosolvent-free polyurethane dispersions to minimize the impact on resources and the environment. The organic solvent used in this process is recovered via distillation.

The new nomenclature classifies the Bayhydrol range according to the chemical-physical base properties to maximize transparency and clarity. In this system:

• U stands for hydroxyfunctional polyurethane dispersions (PUD);
• UH stands for high-molecular-weight polyurethane dispersions (PUD);
• UV stands for radiation-curing polyurethane dispersions;
• A stands for hydroxyfunctional polyacrylate dispersions (PAC);
• AH stands for high-molecular-weight polyacrylate dispersions (PAC);
• UA stands for polyurethane/polyacrylate hybrid dispersions (PUR/PAC);
• E stands for polyester dispersions (PES); and
• B stands for polybutadiene-based copolymer dispersions.

UH-grade polyurethane dispersions can be used nearly universally for the formulation of all common coating systems. OH-functional PUR (grade U) and PAC dispersions (grade A) are also commonly used in combination with hydrophilic or hydrophobic polyisocyanates for the production of waterborne, two-component coating systems. Corresponding one-component systems can be formulated using the AH range of new high-molecular-weight primary dispersions and the innovative PUR/PAC hybrid systems bearing the UA labeling. Finally, the E-grade polyester dispersions join the polyurethane dispersions in playing an important role in one-component stoving coatings.

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