270 HIGH PERFORMANCE POLYMERS
11.4 Special Additives
11.4.1 Flame Retardants
Polyamides, such as PA 6, PA 12 or PA 6.6, PET,
and PEN, can be made flame retardant by the addition
of a mixture of melamine cyanurate and an organo
poly(phosphonate) [77]. The poly(phosphonate) acts
in addition as a plasticizer, improving the mechanical
properties of the polymer and assisting the dispersion
of the melamine cyanurate.
11.4.2 Protective Coatings
Naphthalate polyester articles can be coated with
polymerizable and crosslinkable compositions. The
composition is made from the matrix and a large
amount of benzotriazole derivatives. This class of
compounds absorbs UV light. The cured composi-
tions help protect the naphthalate polyester from UV
exposureand other weathering ...