Process for reducing the discoloration of a plastic molding composition at the processing temperature
AssigneeHoechst Aktiengesellschaft
InventorsGerhard Pfahler, Georg Schmailzl
Life of this patent
Estimating the term…
Abstract
In plastic molding compositions, in particular those based on olefin polymers, which contain phenolic stabilizers and metal ions as catalyst residues, the discoloration at the processing temperature is reduced if they contain triglycerol or ditrimethylolpropane as catalyst deactivators.
Claims6
A process for reducing the discoloration of a plastic molding composition which contains a phenolic compound as stabilizer and heavy-metal ions as catalysts residues, which comprises adding at the processing temperature from 0.001 to 1% by weight, based on the polymer, of ditrimethylolpropane to the molding composition wherein said polymer is polyethylene or polypropylene or mixture thereof.
A method for deactivating a catalyst residue in a molded organic polymer consisting of the step of adding ditrimethylolpropane to a molding composition which contains the organic polymer during the molding of said molding composition.
Dependencies are inferred from the claim text.