Generic name established by the Federal Trade Commission for "a manufactured fiber in which the fiber - forming substance is any long-chain synthetic polymer composed of less than 85% but at least 35% by weight of acrylonitrile units, except when it qualifies as rubber".
Modacrylic, Synthetic copolymer fiber. Modacrylics are soft, strong, resilient, and dimensionally stable. They can be easily dyed, show good press and shape retention, and are quick to dry.