| 摘要 |
Granular polymers are prepared from methacrylic acid esters or mixtures thereof, by subjecting them to a kneading operation at a temperature sufficiently high to induce polymerization. Polymerization catalysts, fillers, plasticizers, known modifying agents or liquids miscible with the monomers such as hexane, petrol, water, ethanol or methanol, may also be present. In examples: (1) methyl methacrylate with or without the addition of (2) benzoyl peroxide, (3) stearic acid, diethoxyethyl phthalate, and benzoyl peroxide, (4) polymethylmethacrylate, diamylphthalate and stearic acid, with or without benzoyl peroxide, (6) stearic acid, hexane and benzoyl peroxide, (7) alpha cellulose, stearic acid and benzoyl peroxide, (11) ethyl methacrylate, diethoxy ethyl phthalate and benzoyl peroxide, or (12) cyclohexyl methacrylate, dimethyl phthalate and benzoylperoxide, are polymerized in a mixing apparatus; (10) methyl methacrylate and benzoyl peroxide are partially polymerized in the mixing apparatus and there is added thereto glycol dimethacrylate and benzoyl peroxide and the mixing continued. |
