For these classes of additive packages, Polyvel has
consistently provided customized additive packages through thorough diagnosis
of the end use application. Because of the nuances of each application, Polyvel
has found it unnecessary to provide a ‘stock’ line of additive packages,
instead choosing to stay function specific. Our manufacturing capability allows
us to work with a near limitless amount of thermoplastic resins, additives, and
combinations thereof. These additive classes all work to prevent polymer
degradation or improve process control. The many adverse effects of polymer degradation include, but are
not limited to: discoloration, reduction in mechanical properties (which can
lead to part failure), malodors, and the creation of gels. Process control is particularly important in the foaming process where cell size management can be a challenge.
UV Absorbers can be considered UV
stabilizers. They function by protecting the polymer from oxidation and
degradation brought on my ultra-violet light. Polyvel has the capability to
compound benzophenones, benzotriazoles, oxanilides, metal oxides, and many other specialty UV absorbers.
Antioxidants can perform many useful
functions in a polymeric system. The primary purpose is to interrupt the
oxidation reaction by terminating free radicals. Free radicals can be created
by heat, environmental conditions, leftover catalyst, and other chemistries
present in the polymer such as peroxides. Free radicals in a polymeric system
ultimately lead to polymer degradation.
Hindered amine stabilizers (HAS, originally
referred to as hindered amine light stabilizers, HALS) prevent oxidation by
scavenging free radicals. Both hindered amines and hindered phenols (a common
AO chemistry) are high pKa chemicals that can discolor a polymer if dosed
incorrectly. For this reason, proper guidance from Polyvel is important to each
Polyvel's foam stabilizer contain high loadings of GMS. They are for use in gas-inject applications, specifically in polyethylene (PE). The additive is well dispersed and uniform in each pellet.
For more information or to receive a sample, please contact us.