Patents for November 2022
Patents as compiled by the editors of Rubber World Magazine for November 2022
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november
NR masterbatch aging conditions’ effect on final properties
Natural rubber masterbatch was aged at different temperatures, and the effect of aging conditions on masterbatch, final batch, Mooney scorch and cure characteristics, and cured sample was studied.
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Are all thermoplastic polyolefins created equal?
Thermoplastic polyolefin (TPO) is one of the fastest growing commercial roofing systems on the market. Developed in Europe in the 1970s, TPO was introduced to the U.S. market in the late 1980s and has become the dominant installed roof system in the industry; now used on 53% of commercial roofs, according to the American Institute of Architects.
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November 2022
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Taraxacum kok-saghyz latex quantification and extraction from roots
Latex purification methods have been developed from TK roots, adapting methods used for the guayule shrub.
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Electrically conductive elastomers based on NR and polyaniline
Natural rubber is an electrically insulating material, but introduction of conductive fillers like carbon based materials (carbon black, graphite, carbon nanofibers or nanotubes) or metal fillers can increase the conductivity of the resulting composite. These materials are frequently used for electromagnetic/radiofrequency interference (EMI/RFI) shielding, and laboratory and military uses.
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Preparation of polypropylene and skim natural rubber/thermoplastic natural rubber blends: Determining processing conditions
Centrifuged latex production in Sri Lanka contributes over 25% of the country’s annual total rubber production. This share is an increasing trend, when the production figures for the last decade are considered. During the centrifugation process, concentrated or creamed latex with dry rubber content of 60% is separated as centrifuged latex, and 5% to 10% of rubber available in the field latex is removed as the diluted fraction. It has 3% to 5% dry rubber content and a high amount of non-rubbers. This diluted fraction is known as skim latex, and the rubber extracted from acid coagulation of skim latex is referred to as skim natural rubber (SNR).
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3D printing of synthetic rubber ink via the direct ink writing process
by Sarath Suresh Kamath and Jae-Won Choi, The University of Akron Natural rubber, which is mainly composed of poly-cis-isoprene and
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Post International Elastomer Conference Show Daily
This follow-up to the 2021 International Elastomer Conference and Expo, held last month in Pittsburgh, Pennsylvania, and
published for the Rubber Division, ACS by Lippincott & Peto, Inc., includes photographs and summaries of IEC events, including the 2022 Science & Technology Award winners, Rubber Division, ACS
service award recipients, 2021 scholarship and Rubber Technology Training Award recipients, the Experience Elastomers
Student Outreach Program, the Rubber Division’s 2021-2023 Strategic Plan, the inaugural Rubber Chemistry & Technology Excellence Award and Expo exhibitors.
Mechanism of oxidation in natural rubber compounds at lower (ambient) temperatures
The oxidation mechanism of natural rubber was studied using several techniques. In a prior article, it was found that the crosslink distribution (sulfur types including polysulfidic, disulfidic and monosulfidic) in a belt coat (conventional cured natural rubber compound) had a different crosslink distribution, depending on the aging temperature (ref. 1). The belt coat compound extracted from an oven aged (65°C) tire was compared to the belt coat compound extracted from a normal service tire (23°C, the average annual temperature in Phoenix, AZ)
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