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US 6,551,538 B1Granted
Vacuole-free polymer granulates
AssigneeBayer Aktiengesellschaft
InventorsThomas Elsner, Jürgen Heuser, Christian Kords
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Abstract
A process for preparing a vacuole-free polymer is disclosed. Extruded polymer resin is cooled at a rate of less than 50° C./sec. to a temperature that is 1 to 20° C. above the glass transition temperature of the polymer resin and the resin is then cut.
Claims9
Process for producing vacuole-free polymer granules wherein, after having been extruded, the polymer is cooled at a cooling rate of <50° C./sec to a temperature which is 1° C. to 20° C. above the glass transition temperature Tg of the polymer, and then cut.
A process for producing polymer granules comprising:
- extruding a thermoplastic polymer;
- and
- cooling the extruded polymer at a cooling rate <50° C./sec to a temperature which is 1° C. to 20° C. above the glass transition temperature Tg of the polymer,
- wherein the polymer granules contain less than 1 percent by volume vacuoles.
1 more element
Dependencies are inferred from the claim text.