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Chewing gum is a soft, cohesive substance designed for chewing but not swallowing. Humans have used chewing gum in some form for at least 3,000 years. Modern chewing gum is made from butadiene-based synthetic rubber. Most chewing gums are considered polymers. ==History== Chewing gum in many forms has existed since the Neolithic period. 5,000-year-old chewing gum made from birch bark tar, with tooth imprints, has been found in Kierikki, Yli-Ii, Finland. The tar from which the gums were made is believed to have antiseptic properties and other medicinal benefits.〔("Student dig unearths ancient gum" ) BBC.co.uk.〕 The ancient Aztecs used chicle, a natural tree gum, as a base for making a gum-like substance and to stick objects together in everyday use. Forms of chewing gums were also chewed in Ancient Greece. The Ancient Greeks chewed mastic gum, made from the resin of the mastic tree.〔("The History of Chewing Gum and Bubble Gum" ) page of (About.com Inventors ).〕 Many other cultures have chewed gum-like substances made from plants, grasses, and resins. The American Indians chewed resin made from the sap of spruce trees.〔("History Of Chewing Gum" ) page of (BeemarsGum.org ).〕 The New England settlers picked up this practice, and in 1848, John B. Curtis developed and sold the first commercial chewing gum called The State of Maine Pure Spruce Gum. Around 1850 a gum made from paraffin wax was developed and soon exceeded the spruce gum in popularity. William Semple filed an early patent on chewing gum, patent number 98,304, on December 28, 1869.〔(Patent number 98,304 )〕 The first flavored chewing gum was created in the 1860s by John Colgan, a Louisville, Kentucky pharmacist. Colgan mixed the aromatic flavoring tolu, a powder obtained from an extract of the balsam tree with powdered sugar, creating small sticks of flavored chewing gum he named "Taffy Tolu". Colgan also lead the way in the manufacturing and packaging of chicle-based chewing gum, licensing a patent for automatically cutting chips of chewing gum from larger sticks: US 966,160 "Chewing Gum Chip Forming Machine" August 2, 1910〔(【引用サイトリンク】title=Web-cutting attachment for wrapping-machines )〕 and a patent for automatically cutting wrappers for sticks of chewing gum: US 913,352 "Web-cutting attachment for wrapping-machines" February, 23, 1909〔(【引用サイトリンク】title=Web-cutting attachment for wrapping-machines )〕 from Louisville, Kentucky inventor James Henry Brady, an employee of the Colgan Gum Company. Modern chewing gum was first developed in the 1860s when chicle was brought from Mexico by the former President, General Antonio Lopez de Santa Anna, to New York, where he gave it to Thomas Adams for use as a rubber substitute. Chicle did not succeed as a replacement for rubber, but as a gum, which was cut into strips and marketed as Adams New York Chewing Gum in 1871. Black Jack (1884) and Chiclets (1899), it soon dominated the market.〔(Chewing gum companies in 1860-1900 )〕 Synthetic gums were first introduced to the U.S. after chicle no longer satisfied the needs of making good chewing gum. The hydrocarbon polymers approved to be in chewing gum are styrene-butadiene rubber, isobutylene, isoprene copolymer, paraffin wax, and petroleum wax. By the 1960s, US manufacturers had switched to butadiene-based synthetic rubber, as it was cheaper to manufacture. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Chewing gum」の詳細全文を読む スポンサード リンク
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