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US 5,191,211 AGranted
Thermal desorption method for separating volatile additives from vulcanizable rubber
AssigneeBridgestone/Firestone, Inc.
InventorWilliam B. Gorman, Jr.
Life of this patent
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Abstract
Volatile additives for vulcanized or unvulcanized rubber can be accurately identified by controlled heating of a test sample in a sealed vial equipped with an overhead collecting headspace, transferring the heated volatiles to a chromatograph column, and analyzing the separated volatile components emerging from the chromatograph column by various selective analytical detectors.
Claims12
A process for separating and identifying volatile components from a test sample of vulcanized or unvulcanized rubber compound, comprising the steps of:
- a) heating the test sample in a sealed vial having an overhead collecting headspace at temperature sufficiently high to volatilize the volatile components in the test sample but below a pyrolysis temperature of the polymer to avoid pyrolysis of the test sample;
- b) allowing the volatile components to collect in the headspace;
- c) transferring the volatile components at a temperature sufficient to maintain the gaseous state of the volatile components, to a chromatograph column to separate the volatile components;
- and
- d) transferring each component to an analyzer detector for identification.
2 more elements
Dependencies are inferred from the claim text.