Process for forming polymer structures containing an oxygen sensor
a polymer structure and oxygen sensor technology, applied in the direction of chemical methods analysis, instruments, chemical indicators, etc., can solve the problems of gas-sampling techniques, oxygen monitoring inside containers has required destructive lot testing and laborious, and there are no available technologies that provide practical means for measuring in-package oxygen
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example 1
[0044] This example provides a process for producing a polymer-indicator product with commercial utility as a colorant masterbatch. Color concentrates are high-content mixtures of dye in a carrier resin most commonly used for coloration of a polymer film, sheet or molded part. Color concentrates or masterbatches, are mixed with process polymers to prepare colored parts. In this example, we describe methods for preparation of 3-different colorant masterbatches.
[0045] 100 Grams of a polyethylene-octene copolymer (Elite 5100, Dow Chemical) was added to the mix chamber of a Braebender mixer and melted at a temperature of 200° C. for approximately 5 minutes. One-gram of oxygen sensitive indicator (PtOEP) (Strem) was added to the polymer melt and mixed for an additional 7 minutes. The chamber was cooled to room temperature and the hardened polymer product was removed. Visual examination of the batch showed a homogeneously mixed material with no inclusions or exclusions of oxygen sensitiv...
example 2
[0048] This example illustrates compounding polymer masterbatch products into carrier polymers including LLDPE's normally used in the manufacture of food packaging films. LLDPE refers to linear low-density polyethylene and copolymers of ethylene with one or more comonomers selected from preferably C4 to C10 alpha olefins such as octene. Commercially available examples of these include: Elite 5100—an ethylene-octene copolymer (Dow Plastics); Dowlex 2245—a low-density polyethylene (Dow Plastics). Rexene Pe1375 is an ethylene-vinyl acetate copolymer (Huntsman).
[0049] A 100-mg sample of PdTPP Masterbatch #2 was diluted by blending into 3 grams of undyed carrier polymer (ethylene-octene copolymer, Elite 5100). Pellets of the two materials were melted in a vessel heated to 200° C. and mixed thoroughly by hand for 4 minutes. The mixture was cooled to room temperature and the indicator-polymer was removed and cut into small pieces, each piece weighing approximately 100 mg each. A sample of...
example 3
[0052] This example demonstrates the production of an extruded polymer film containing the indicator in a single layer of the extruded film. 100 grams of the PtOEP Masterbatch #1 (indicator-polymer) pellets prepared in Example 1 were added to the second hopper of a Rand-Castle Tabletop extruder. The process chamber temperature was maintained at 205° C. The polymer materials were calculated to have a 3-5 minute mean residence time in the extruder. The masterbatch material was mixed into a process stream of the commercial polymer, Elite-5100, in the extruder from which a film was extruded (¾ ft×100 f×2 mil). The final indicator concentration of in the film was approximately 0.3 μg / cm2. No signs of inclusions or gels or other anomalies were found thus indicating that the presence of the indicator did not create interferences with the extrusion process.
[0053] The film had a slightly pink hue that visibly became brighter when placed in a low oxygen environment and illuminated with a “bl...
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