Polybutene molded article and method for making same
AssigneeThe Dow Chemical Company
InventorKuo Z. Hong
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Abstract
The specification discloses a polybutene-1 polymer product and method and apparatus for making same in which the polymer is introduced into a form which defines the shape of the desired part and is then subjected to shear at a temperature from just above to just below the melting point of the polybutene-1 polymer, achieved by positioning the polymer blend between a shell and a mandrel and rotating the two relative to one another. When the viscosity of the polymer reaches a maximum, the part solidified and removed for subsequent use.
Claims17
A method for producing a polybutene-1 polymer product comprising:
- forming a melt of polymeric material comprising polybutene-1 at a temperature above the melting point of polybutene-1;
- introducing said melt of polymeric material comprising polybutene-1 into a form defining the desired shape;
- cooling said melt of polymeric material comprising polybutene-1 to a temperature in the range from just above the melting point to just below the melting point of said polybutene-1 polymer;
- subjecting said melt of polymeric material to a generally uniform and constant rotational shear in said form within said temperatrure range from just above to just below the melting point of said polybutene-1 polymer to induce crystallization thereof;
- discontinuing rotational shear while said melt of polymeric material is at a temperature within said range of temperature;
- and
- allowing said polymeric material to harden.
The method of claim 14 in which up to 50% polystyrene is blended with said polybutene-1.
Dependencies are inferred from the claim text.