The guayule plant naturally has a very low level of protein, says Robert Hamilton, PhD, professor of medicine and pathology at Johns Hopkins University School of Medicine in Baltimore, who conducted groundbreaking research on the allergenic properties of natural rubber latex.
patent: 7,473,728 Issued: January 6, 2009 Inventors: Junling Zhao, Michael Julian Crawford, Aaron Scott Puhala and Martin Paul Cohen Assigned: Goodyear Tire & Rubber Key statement: This invention relates to a dual phase rubber composition and pneumatic tire with a rubber sidewall thereof, namely a dual phased non-black colored rubber composition composed of a first pre-formed elastomer phase comprised of butyl-type rubber and EPDM rubber containing a dispersion therein of reinforcing filler comprised of a particulate amorphous precipitated silica and a second pre-formed elastomer phase comprised of a nanocomposite of natural rubber containing a dispersion therein of exfoliated clay platelets.
2 Devices that contain natural-rubber latex will be required to carry the following statement on the label: "Caution: This Product Contains Natural Rubber Latex Which May Cause Allergic Reactions.
The invention particularly relates to a process of (a) preparing a natural rubber-rich rubber composition comprised of pre-treating precipitated silica aggregates prior to blending with, or in the presence of, dry natural rubber with a fatty alcohol and/or epoxidized soybean oil to the exclusion of sulfur curative for the natural rubber, mixing an organalkoxysiloxane based polysulfide coupling agent with said dry natural rubber coincidentally with or subsequent to said precipitated silica aggregate fatty alcohol and/or epoxidized soybean oil pre-treatment to form a composite thereof, to the exclusion of sulfur curative, followed by (b) mixing the resulting rubber mixture with sulfur curative and (c) curing the resulting rubber composition.
Atlanta Biotech Company Supports Manufacturing Trials Worldwide ATLANTA -- Vytex(TM) Natural Rubber Latex (NRL), a patented specialty chemical that virtually eliminates allergy-causing proteins found in latex, could prevent allergies from developing.