Stabilization of talc-filled polystyrene
AssigneeJohns Manville
InventorChristian John Miga
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Abstract
A talc-filled polystyrene composition which is stabilized against short-term color degradation is described. The composition comprises polystyrene, talc, and a polyester-forming mixture of a polybasic organic acid or anhydride, preferably trimellitic anhydride, and a polyhydric alcohol, preferably a polyethylene glycol.
Claims12
A polystyrene composition filled with at least 20% by weight of talc and stabilized against short-term color degradation, which comprises, in parts by weight:
- ______________________________________ polystyrene 25 to 80 parts talc 20 to 75 parts ______________________________________
- and 0.5 to 5 parts of a mixture of polyester forming reactants comprising a polybasic organic acid or anhydride and a polyhydric alcohol, each having a melting point in the range of 250.degree. to 550.degree. F, said organic acid or anhydride and said alcohol each being present in said mixture in an amount of from 1 to 2 parts by weight per 3 parts by weight of said mixture.
A filler composition for highly filled polystyrene which comprises, in parts by weight, 25 to 80 parts of talc and 0.5 to 5 parts of a mixture of polyester-forming reactants comprising a polybasic organic acid or anhydride and a polyhydric alcohol, each having a melting point in the range of 250.degree. to 550.degree. F, said organic acid or anhydride and said alcohol each being present in said mixture in an amount of from 1 to 2 parts by weight per 3 parts by weight of said mixture.
Dependencies are inferred from the claim text.