As an Isocyanate Primer

It is best if substrates that are being directly treated with reactive isocyanates are relatively dry and free from surface moisture, otherwise porosity and gassing due to the degeneration of CO2 gas occurs at the adhesion interface. In textiles moisture levels should be 1 % for satisfactory adhesion. 

The following are examples of adhesion to various substrates. The first method is by the direct application of isocyanate as a primer. 

Unvulcanized rubber (sulphur-crosslinked) mixes are freshly coated with a 20% solution of 4,4, 4 -triphenylmethane triisocyanate (Desmodur R) or methylene chloride. After drying, the rubber is vulcanized in contact with a cleaned metal surface and a strong bond results. The reverse procedure is also satisfactory. For example, by this technique heat-, fatigue-, impact-, oil- and solvent-resistant bonds can be obtained between metals and elastomers by press or hot-air curing the green freshly milled or calendered 

ADHESION VALUES BETWEEN VARIOUS RUBBERS AND METALS USING 4,4, 4 -TRIPHENYLMETHANE TRIISOCYANATE AS BONDING AGENT (DIRECT TENSION TEST) 

Polychloroprene to steel Polychloroprene to brass Polychloroprene to stainless steel Polychloroprene to aluminium Polychloroprene to copper Natural rubber to steel 

---