Use of nucleus-brominated phthalic acid anhydride for stabilizing thermoplastic polycarbonates against the effect of gamma-rays
AssigneeBayer Aktiengesellschaft
InventorsCharles Lundy, Ulrich Grigo, Alexa Sommer, Klaus Horn, Klaus Sommer, Arno Becker
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Abstract
The invention relates to the use of nucleus-brominated phthalic acid derivatives, optionally in combination with polyalkylene oxides corresponding to formula (V) ##STR1## in which R is H, C.sub.1-6 alkyl, tetrahydropyranyl or a silyl group, R' is H or C.sub.1-6 alkyl and x is an integer of 1 to 100, for stabilizing thermoplastic polycarbonates against the effect of .gamma.-rays.
Claims2
A thermoplastic molding composition characterized by its improved stability against the effect of .gamma.-radiation comprising an aromatic polycarbonate resin and a nucleus-brominated phthalic acid anhydride conforming to ##STR9## in which n is 1, 2, 3 or 4 and
- 0. 1 to 10% relative to the weight of said composition of a polyalkylene oxide corresponding to ##STR10## in which R is H, C.sub.1-6 -alkyl, tetrahydropyranyl or a silyl group,
- R' is H or C.sub.1-6 -alkyl and
- x is an integer of 1 to 100.
- said stability being greater than that imparted to the resin by said polyalkylene oxide alone.
Dependencies are inferred from the claim text.