WESTON™ DPP is a diaryl phosphite ester antioxidant with a high phosphorus content and relatively low molecular weight. Improves color and light stability in polymers that do not require food contact.
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WESTON™ DPP is a phosphite ester antioxidant that improves color and light stability in polyolefins and other polymers that do not require food contact approvals. It has a high phosphorus content and relatively low molecular weight and can be used to prevent plate-out in PVC.
Appearance: Clear liquid
Specific gravity @ 25°C: 1.200–1.220
Acid number: 15.0 mg KOH/g
Refractive index @ 25°C: 1.5550–1.5575
Phosphorus content: 11.6%–12.0%
Color (APHA, Pt-Co): 50 max
Molecular weight: 234 g/mol
Flash point (closed cup): 143°C
Viscosity @ 38°C: 10.5 cps
Density @ 25°C: 1.21 g/mL
Vapor pressure @ 5 mm Hg: 140°C
Soluble: Most common aprotic organic solvents
Insoluble: Water, with hydrolyze in the presence of water
Primary Chemistry:
Diphenyl phosphite
Low phosphorus content of traditional diphenyl phosphite antioxidants
Low color or light stability in non-food plastic or polymer applications
Plate-out or degradation issues in PVC plastics
Unsaturated polyesters
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