Solvent-borne polychloroprene-based

Plate 23 Insulated roof panels are prepared from the shaped steel profile shown and polystyrene board. Both are sprayed with a solvent-borne polychloroprene-based contact adhesive. By balancing the rate of solvent evaporation carefully it is possible to apply the adhesive without damaging the polystyrene - which dissolves readily in many organic solvents, Some 5-10 minutes after being sprayed the two parts are assembled and passed through rollers which press them firmly together. This process is very quick and a stationary press is not required. Material SPRAYLOCK 901 manufactured by National Adhesives Resins Ltd. 

Butyl phenolic resin is a typical tackifier for solvent-borne polychloroprene adhesives. For these adhesives, rosin esters and coumarone-indene resins can also be used. For nitrile rubber adhesives, hydrogenated rosins and coumarone-indene resins can be used. For particular applications of both polychloroprene and nitrile rubber adhesives, chlorinated rubber can be added. Styrene-butadiene rubber adhesives use rosins, coumarone-indene, pinene-based resins and other aromatic resins. 

Polychloroprene latex adhesives. The formulations of polychloroprene latex adhesives contain essentially the same components as the solvent-borne CR adhesives, except that water-based ingredients have to be used and the compounding is particularly exigent. The following ingredients can be found in most polychloroprene latex adhesive formulations. 

Water-borne contact adhesives are growing in importance because of environmental regulations, occupation health and the flammability of solvents. The solids content in the water-borne polychloroprene adhesives varies between 40 and 60 wt%, and viscosities between 15 and 500 mPa can be obtained. Although polychloroprene Unices are water based, they are generally inflammable as the resin is dissolved in organic solvents before emulsifying. All polychloroprene latices are susceptible to coagulation by mechanical, thermal and chemical means. 

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