Page 99 - Handbook of Surface Improvement and Modification

94 Tackifiers

1,3-pentadiene comonomer moiety or an aromatically-modified aliphatic tackifier having
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a dicyclopentadiene moiety.
A silicone rubber composition for adhering a semiconductor chip (die) has improved
reliability and adhesiveness by comprising a silicone resin having a vinyl group (the
weight average molecular weight in the range of 100,000 to 130,000), hydrogen polysilox-
ane (the weight average molecular weight in the range of 2,000 to 6,000.), a tackifier
(organopolysiloxane having epoxy functional group as the adhesive imparting agent),
spherical silicone particles having a specific reactive functional group, an inorganic silica
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filler, a hydrosilylation reaction catalyst, and a reaction retardant.
Cashew nutshell liquid contains a large concentration of cardanol and cardols, a nat-
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ural source of meta-substituted alkylated phenols and resorcinols. It is a globally avail-
able bio-renewable commodity, which makes it an ideal building block for the
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manufacturing of phenol-modified hydrocarbon resins. Due to the structure of the com-
ponents of cashew nutshell liquid, the hydrocarbon resins can be manufactured with fewer
39
steps. The cardanol-based hydrocarbon resins have low viscosity, improved solubility in
organic solvents, very low cloud points, and compatibility with a great number of resins
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and polymer formulations. This makes them suitable additives as non-reactive diluents
for solvent-free coating formulations; tackifiers for structural, pressure sensitive, and hot-
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melt adhesives.
Polyamide resins used in preformed thermoplastic pavement marking compositions
are unstable and often disintegrate in the presence of alkaline (pH of 8 or greater) environ-
40
ments. Replacement of polyamide by ethylene vinyl acetate copolymer renders stable
compound which contains 5 to 15 wt% of a tackifier resin that is a rosin ester (e.g., Sylva-
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cote 4981).
Numerous examples of technological processes including tackifiers have been dis-
cussed in this section. The references are not exhaustive but representative of known tech-
nical discoveries, which mostly concentrate on the use of tackifiers in the pressure-
sensitive adhesives.
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