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DELO Introduces Light-curable Black Adhesives

Published on 2016-05-11. Author : SpecialChem

DELO Industrial Adhesives has introduced black adhesives that are light-curable. These products are in demand for visual or safety reasons in many applications, but are very difficult to develop.

DELO Brings Light to the Dark Side
Fig. 1: DELO Brings Light to the Dark Side

For light-curing processes, adhesive needs to be translucent so that photoinitiators in the entire adhesive layer can decompose and start the crosslinking reaction. Because black absorbs the majority of light, the amount that is transmitted becomes naturally lower as the layer gets thicker.

However, the black dyed DELO DUALBOND GE4949 acrylate can be used for thicknesses of up to 500 µm. In addition to its light-curing component, it also contains a small humidity-curing portion, which triggers crosslinking even in small shadowed areas.

The acrylate is medium-viscous, has very good tension-equalizing characteristics thanks to a high elongation at tear, and achieves high strength on various plastics. It is particularly suitable for sealing and bonding for black components. This includes sealing wires, covering lettering, bonding clips or emblems, as well as sealing connecting terminals.

Also available for other adhesive chemicals

For the first time, DELO has also dyed light-activated epoxy resins black that even can be light-cured at thicknesses of up to 1 mm. Unexposed areas can be cured in a subsequent heat curing step. Possible applications for this include covering components for copy protection reasons or shielding against scattered light.

“Many customers request black adhesives that can be cured by light within seconds”, said Robert Saller, Director Sales International and Management Board Member at DELO. “That wasn't very easy, but we can now demonstrate some good results here. In the future, we will continue expanding our product range, particularly in the field of black, light-curing epoxy resins.”

About DELO

DELO is a leading manufacturer of industrial adhesives with its headquarters in Windach near Munich, Germany, and subsidiaries in the USA, China and Singapore. In the fiscal year 2016, 500 employees generated sales revenues of EUR 80 million – EUR 92 million are anticipated for 2017. The company supplies customized special adhesives and associated technology for high-tech industries such as automotive, aviation, optoelectronics, and electronics. DELO’s customers include Bosch, Daimler, Infineon, Osram, Siemens and Sony.

Source: DELO

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