at may be produced from the reaction of a molecule containing a carbon-carbon double bond (e.g., acrylates or methacrylates such as ethyl methacrylate, methyl methacrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, methacrylic acid, acrylic acid, or vinyl monomers such as vinyl acetate, styrene and vinyl chloride).