Flame retardant polymethyl methacrylate molding compound
AssigneeRohm Co., Ltd.
InventorsKarl A. Jung, Karl-Heinz Jakob, Manfred Munzer, Wilhelm Wopker
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Abstract
Flame retardant molding compounds comprising polymers of methyl methacrylate having an average molecular weight between 1.times.10.sup.5 and 2.times.10.sup.5, which molding compounds contain from 8 to 15 weight percent of at least one chloroalkylphosphoric acid ester of the formula ##STR1## wherein R.sub.1 is alkyl or ##STR2## and R.sub.2 is hydrogen, methyl, ethyl, or chloro-substituted methyl or ethyl.
Claims10
A flame-retardant molding compound comprising a polymer of methyl methacrylate having an average molecular weight between 1.times.10.sup.5 and 2.times.10.sup.5, from 8 to 15 percent by weight of a first additive which is at least one chloroalkylphosphoric acid ester of the formula ##STR24## wherein R.sub.1 is alkyl having from 1 to 4 carbon atoms or ##STR25## and R.sub.2 is hydrogen, methyl, ethyl, or chloro-substituted methyl or ethyl, and from 0.05 to 2 percent by weight of a second additive which is a sterically hindered phenol or of an ester of trivalent phosphorus, said ester having the formula ##STR26## wherein R.sub.6 is the same or different alkyl or alkylphenyl having 14 to 24 carbon atoms,
- P(OR.sub.7).sub.3,
- wherein R.sub.7 is the same or different alkylphenyl having 14 to 24 carbon atoms, or ##STR27## wherein R.sub.8 is the same or different alkyl or alkylphenyl having 14 to 24 carbon atoms.
Dependencies are inferred from the claim text.