Use of di- and mono-(trialkylammonium) mono- and di-alkyl-phosphonates (I) as thermal stabilizer in bulk polymerization of methyl methacrylate mixtures in casting cell is claimed. - Use of di- and mono-(trialkylammonium) mono- and di-alkyl-phosphonates of formula (I) as thermal stabilizer in bulk polymerization of methyl methacrylate mixtures in casting cell is claimed. - R1nPO3-(HN+-R23)m (I) - R1 = methyl, ethyl, propyl, iso-propyl, butyl, iso-butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl; - R2 = methyl, ethyl, propyl, iso-propyl, butyl; - n = 1 or 2; and - m = 2 or 1.
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