Page 146 - Handbook of Adhesion Promoters

8

Selection of Adhesion

Promoters for

Different Substrates

This chapter contains a review of existing literature on the use of adhesion promoters to
assist in the selection of the most suitable adhesion promoters for polymers in which these
additives are used. Details of use will contain information on formulation optimization,
the mechanisms of adhesion promotion, and improvement of characteristic properties of
the polymer. The information is based on suggestions from manufacturers of adhesion
promoters, published papers, and patented applications.

8.1 ABS

Many commercial additives are suggested by their manufacturers for addition to ABS
products. These include acrylate dendritic oligomers and urethane-acrylate copolymers
(Bomar BR-7432GB, BR-941, and BR-3741AJ), maleic anhydride-modified styrene poly-
mer (Xibond 160, 180, 220, 230, 240, 250, 255, 260, 280, and 285), carboxy/hydroxy-
functional silanes (Chartwell C-523.71HR and Chartwell C-531.1) and aminosilanes (Sil-
quest A-1110, A-Link 15, and Y-19139).
This variety of potential additives indicates
that further comparison may result in
improvement and efficient use of the fre-
quently expensive additives used in a usu-
ally broad range of concentrations (0.35-2
phr for silanes or 1-5 phr for maleic anhy-
dride-modified polymer).
Carboxyl and hydroxyl present on the
surface of polymer increase adhesion to
metals. For sputtered and galvanically
strengthened copper coatings on an acrylo-
nitrile-butadiene-styrene polymer sub-
Figure 8.1. Time dependence of the adhesive energy
between copper and ABS. Insert is a schematic repre- strate, the adhesion strength increased from
sentation of the 90° peel test. [Adapted, by permission, 6 to 53 J/m during a 1008-h period (Fig-
2
from Kisin, S; Scaltro, F; Malanowski, P; van der Varst, ure 8.1). Increased concentrations of car-
1
PGT; de With, G, Polym. Deg. Stab., 92, 4, 605-10,
2007.] bonyl functionalities were noted at the