Novel particulate expandable styrene polymers having short minimum molding times and method for preparing same
AssigneeTexstyrene Plastics, Inc.
InventorsThomas B. White, James J. Uebelhart
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Abstract
Particulate expandable styrene polymers are coated with a distilled acetylated monoglyceride product to reduce the cooling time of articles molded from such expandable styrene polymers. Coating of the expandable particulate styrene polymer is obtained by contacting the polymer with an emulsion of a distilled acetylated monoglyceride and water with a suitable surfactant. The distilled acetylated monoglyceride is a liquid at room temperature and is substantially completely acetylated.
Claims20
A method for preparing particulate expandable styrene polymers having a coating of a distilled acetylated monoglyceride comprising:
- introducing the particulate expandable styrene polymer into a mixing vessel;
- preparing an emulsion of the distilled acetylated monoglyceride, water and a suitable surfactant;
- adding an effective amount of the emulsion to the particulate expandable styrene polymer with mixing;
- and
- removing the excess water from the particulate expandable styrene polymer.
Expandable particles of a styrene polymer containing a blowing agent, said particles having a surface coating comprising a distilled acetylated monoglyceride which is a liquid at room temperature.
A method of molding particles from particulate expandable styrene polymers comprising:
- introducing the particulate expandable styrene polymer into a mixing vessel;
- preparing an emulsion of a distilled acetylated monoglyceride, water and a suitable surfactant;
- adding an effective amount of the emulsion to the particulate expandable styrene polymer with mixing;
- removing the excess water from the particulate expandable styrene polymer;
- introducing the coated particulate expandable styrene polymers into a mold;
- applying heat to the mold above the boiling point of the expanding agent thereby causing the expandable particulate styrene polymer to expand.
Dependencies are inferred from the claim text.