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This paper describes fundamental developments in two-component (two-pack, 2K) waterborne polyurethanes for autmotive OEM clearcoats. The focus is on work in progress concerning: raw materials relevant chemistry application considerations

Flying stones and other debris are causing more and more damage to the aerodynamically styled automobiles. Many solutions have been explored for minimizing this damage. Coatings based on polyurethane technology have been shown to be a viable approach for providing chip resistance.

This new process for recycling of RIM process scrap consists of granulating scrap parts, pre-heating, then compression molding. Painted or unpainted parts, either reinforced or non-reinforced, can be recycled by this process. The degree of recovery of mechanical properties, relative to the original RIM part, depends on the key processing parameters, which include compression time, temperature, pressure and granulate size.

This article focuses on new findings related to the scratch resistance of two-component polyurethane clear coats under a variety of conditions (methods) and with differing media (dry abrasives, wet abrasives, etc.). The results are discussed in connection with polymer structure data and other important film properties, such as acid etch resistance.

To meet the future acceptance and economic justification for expanded uses of RRIM and other thermoplastics, a new innovation for painting components on-line in automobile assembly plants is essential. A new coating technology, referred to as UNICOAT, based on two-component aliphatic urethane chemistry, shows promise as a way of achieving the flexibility, hardness and weathering properties for coatings over plastic and metal substrates. This can be accomplished when the components are painted simultaneously and followed by oven baking just below the heat distortion temperature of the plastics. The unique chemistry of urethane coatings provides latitude in curing conditions that avoids problems associated with the heat distortion characteristics of many plastics.

In the European automotive industry waterborne paint materials have gained an important market share. Among the new developed waterborne systems the polyurethane technology offers the opportunity to achieve the same high quality level that has been obtained in the past by the use of solventborne 1- and 2-component PUR-materials. In the primer surfacer area, waterborne PUR-based systems that exhibit the same or even better stone chip resistance than the corresponding solventborne ones have already been developed and introduced into the market. For the top coat area exist as well many efforts to introduce waterborne systems. Among the various approaches being considered, the waterborne 2-component PUR system provides not only excellent film properties but shows also interesting and promising application characteristics.