Another category of PSAs is copolymers of acrylic esters. These polymers are inherently tacky and do
not require compounding with resins or other additives, although they may be sometimes compounded
to enhance or change their properties. They are clear and have a good resistance to oxidation and
ultraviolet (UV) light. Acrylic copolymers quickly became the most important materials for pressure-
sensitive products.
Silicone PSAs are also available. They are expensive and their usage is small, but their usefulness
high and low temperatures is unique and not approached by other polymers.
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