Leverkusen, Germany - Hand-held devices such as mobile phones, MP3 players and laptop housings tend to stop looking pristine fairly rapidly, as sticky, wet or greasy hands stain the factory finish of these products.
To prevent this, experts at Bayer MaterialScience have developed new radiation-curing polyurethane dispersions to coat such products, so that they retain that new look for far longer.
These new coatings are solvent-free and are extremely efficient to apply, said the developer.
Radiation curing raw materials will allow BMS to replicate the success it has had with Bayhydrol UV in wood and furniture coating in the plastics coating market, said Dr Jan Weikard of BMS. Waterborne UV coatings have very high growth rates in the wood and furniture sector, mainly because they are both environmentally friendly and cost-effective.
BMS said it regards one of these new products, Bayhydrol UV XP 2689, as a breakthrough in terms of top performance waterborne products. "The extremely highly crosslinked molecular structures created through curing by UV radiation enable the outstanding resistance to hydrolysis and cosmetics," Weikard explained.
The dispersions can be formulated to give coatings which are hard and scratch- and abrasion-resistant. As clear coats on plastics they level out surface roughness in the basecoat, ensuring a very glossy finish, BMS said.
Another new binder, Bayhydrol UV XP 2736, gives coatings for plastic film, fabric and other flexible substrates, where BMS said they offer excellent adhesion and mechanical resistance. The binder can also be used with other UV-curing dispersions to increase the flexibility and elasticity of the final coating.