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1889. Eastman Kodak successfully filed a patent for the celluloid film. [6] 1890s. Galalith, a plastic derived from casein developed by Wilhelm Krische and Adolph Spitteler. [7] 1890s. Auguste Trillat discovered the means to insolubilize casein by immersion in formaldehyde, producing material marketed as galalith.
Infobox references. Polypropylene (PP), also known as polypropene, is a thermoplastic polymer used in a wide variety of applications. It is produced via chain-growth polymerization from the monomer propylene. Polypropylene belongs to the group of polyolefins and is partially crystalline and non-polar.
J. Paul Hogan. John Paul Hogan (August 7, 1919 [1] – February 19, 2012) [2][3] was an American research chemist. Along with Robert Banks, he discovered methods of producing polypropylene and high-density polyethylene. [1]
[1] 9.2 billion metric tons of plastic are estimated to have been made between 1950 and 2017, more than half of which has been produced since 2004. In 2020, 400 million tons of plastic were produced. [2] If global trends on plastic demand continue, it is estimated that by 2050 annual global plastic production will reach over 1.1 billion tons.
The Neoproterozoic Era is the last of the three geologic eras of the Proterozoic eon, spanning from 1 billion to 538.8 million years ago, [2] and is the last era of the Precambrian "supereon". It is preceded by the Mesoproterozoic era and succeeded by the Paleozoic era of the Phanerozoic eon, and is further subdivided into three periods , the ...
A 2017 study found indoor airborne microfiber concentrations between 1.0 and 60.0 microfibers per cubic meter (33% of which were found to be microplastics). [120] Another study looked at microplastic in the street dust of Tehran and found 2,649 particles of microplastic within 10 samples of street dust, with ranging samples concentrations from ...
Municipal solid waste: According to a 2010 report of the United States Environmental Protection Agency (EPA) the US had 31 million tons of plastic waste, representing 12.4% of all municipal solid waste. Of that, 2.55 million tons were recovered. This 8.2% recovery was much less than the 34.1% overall recovery percentage for municipal solid ...
Until roughly 2.3 billion years ago, oxygen was probably only 1% to 2% of its current level. [8]: 323 The banded iron formations, which provide most of the world's iron ore, are one mark of that mineral sink process. Their accumulation ceased after 1.9 billion years ago, after the iron in the oceans had all been oxidized. [8]: 324