This category includes various acrylic, acrylonitrile, acrylamide, and maleic anhydride polymers. These homo- and co-polymers offer a wide range of properties: rigid, flexible, hydrophilic, or hydrophobic. They have good environmental stability and are used in coatings, adhesives, and fibers. Most polymers are thermoplastic and are readily converted into the desired shape by a thermal process.