Patents for March 2023
USPTO patents as compiled by the editors of Rubber World for March.
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March
March 2022
The March issue is now available online. Issue emphasis is on Custom Mixing & Compounding. Includes Suppliers directory for 2022.
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Effect of accelerator mixing ratio on curing characteristics of EPDM gasket materials
Due to the long service life of the washing machine, all polymer parts, especially rubber parts, need to have a service life of at least 10 years, which means excellent resistance to aging.
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Custom Mixing, Services directory for 2022
The following directory lists custom services suppliers. The first part lists custom rubber mixers along with plant locations, equipment, mixing capabilities and whether technical service and/or recipe development are offered. A directory of companies that offer various custom services to the rubber industry follows.
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Patents for March
Patents for the Rubber Industry as compiled by the editors of Rubber World for April
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Evaluation of sustainable bituminous coal in elastomer applications
Austin Black 325 is a finely divided (below 325 mesh) powder produced from high carbon content, low volatility, sustainable bituminous coal. It has different properties compared to carbon black, including a lower specific gravity of 1.30 versus 1.80, a platy ground structure versus the reinforcing morphology of carbon black (figures 1 and 2), and a lower surface area in comparison to carbon black. Beyond its carbon composition, it is more similar in structure to platy fillers like clay and talc. The specific gravity comparison to other platy minerals (1.30 versus 2.50) provides economical and efficiency gains.
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Rheological and mechanical properties of masticated natural rubber and compounds
NR is usually masticated for viscosity reduction through breakdown of the long molecular chains to facilitate subsequent processing steps (e.g., extrusion and calendering) and improve rheological properties, such as die swell, shrinkage and building tack.
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Patents for March
Patents as compiled from the United States Patent Office in March.
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The case for reintroducing latex surgical and exam glove production back into the U.S.
The world today uses 12,000 medical gloves per second. Prior to the UP publication, U.S. glove production had been satisfied by a number of medical device manufacturers, namely, Safeskin, Ansell, Aladan, Baxter, Smith & Nephew and Johnson & Johnson. In addition, glove imports in the U.S. prior to 1985 were 1 billion pieces. In 1996, imports exceeded 21 billion pieces.
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Use of Tire-Derived and Scrap-Derived Polymers in Tire and Non-Tire Applications
The disposal of scrap rubber has been a concern since its vulcanization with sulfur and heat was accidentally discovered by Charles Goodyear in 1839. In addition to the scrap generated in production, there is the question of discarded rubber goods that have outlived their usefulness for their original function. Traditionally, this waste had ended up in landfills, contributing to the growing problem of overcrowding. Scrap tires are a well-publicized category of scrap rubber, as each year automobiles produce 246 million waste tires in the United States alone.
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