
A modacrylic is a synthetic copolymer. Modacrylics are soft, strong, resilient, and dimensionally stable. They can be easily dyed, show good press and shape retention, and are quick to dry. They have outstanding resistance to chemicals and solvents, are not attacked by moths or mildew, and are nonallergenic. Among their uses are in apparel linings...
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http://en.wikipedia.org/wiki/Modacrylic

in textiles, any synthetic fibre composed of at least 35 percent but less than 85 percent by weight of the chemical compound acrylonitrile. It is a ... [1 related articles]
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http://www.britannica.com/eb/a-z/m/105

A fiber formed from long-chain synthetic polymers composed of 35 to 85 percent by weight of acrylonitrile units.
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http://www.chezirene.com/articles/precostuming/pc110-glossary.html

A man-made flame-resistant fiber, similar to acrylic, with warm hand and good bulk. Heat sensitive, so irons at lower temperatures. Used to make faux fur pile fabrics and children
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http://www.encyclo.co.uk/local/22264
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