Stabilization of polycarbonates having high heat distortion temperatures

A thermoplastic molding composition consisting of

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR26## wherein R.sup.1 and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4, are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of a siloxane corresponding to formula (II) ##STR27## wherein R denotes hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl or C.sub.1 -C.sub.10 -alkoxy,
• B is R or A,
• r, s and t independently denote an integer of zero to 200, and wherein
• A denotes a C.sub.1 -C.sub.20 -alkyl or a C.sub.6 -C.sub.10 -aryl group.

A thermoplastic molding composition consisting of

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR28## wherein R.sup.1 and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4, are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of a siloxane corresponding to formula (III) ##STR29## wherein R is hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• u is an integer from 1 to 20,
• v and w denote an integer of from zero to 20, and
• u+v+w.gtoreq.3, and wherein
• A denotes a C.sub.1 -C.sub.20 -alkyl or a C.sub.6 -C.sub.10 -aryl group.

A thermoplastic molding composition comprising

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR30## wherein R.sup.l and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4 are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of at least one siloxane selected from the group consisting of
• (a) a siloxane corresponding to formula (II) wherein ##STR31## R is hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• B is R or A,
• r and t independently denote an integer of zero to 200, and s denotes an integer of 1 to 200
• and (b) a siloxane corresponding to formula (III) ##STR32## wherein R denotes C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• u and v independently are integers of from 1 to 20,
• and w denote an integer of from zero to 20, and
• u+v+w.gtoreq.3, and wherein
• A denotes a hetero atoms-containing aryl group having up to 10 carbon atoms or an alkyl or an aryl group which contains at least one member selected from the group consisting of oxetane or epoxy group wherein said alkyl contains no more than 20 carbon atoms and wherein said aryl contains no more than 10 carbon atoms.

A thermoplastic molding composition comprising

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR33## wherein R.sup.1 and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4, are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of a siloxane corresponding to formula (II) ##STR34## wherein R denotes hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl or C.sub.1 -C.sub.10 -alkoxy,
• B is R or A,
• r and t independently denote an integer of zero to 200, and wherein s denotes 1 to 200 and
• A denotes a hetero atoms-containing aryl group having up to 10 carbon atoms or an alkyl or an aryl group which contains at least one member selected from the group consisting of oxetane or epoxy group wherein said alkyl contains no more than 20 carbon atoms and wherein said aryl contains no more than 10 carbon atoms.

A thermoplastic molding composition comprising

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR35## wherein R.sup.1 and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4 are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of a siloxane corresponding to formula (III) ##STR36## wherein R is hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• u and v independently are integers of from 1 to 20,
• and w denote an integer of from zero to 20, and
• u+v+w.gtoreq.3, and wherein
• A denotes a hetero atoms-containing aryl group having up to 10 carbon atoms or an alkyl or an aryl group which contains a member selected from the group consisting of oxetane or epoxy group wherein said alkyl contains no more than 20 carbon atoms and wherein said aryl contains no more than 10 carbon atoms.

A thermoplastic molding composition consisting of

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR37## wherein R.sup.1 and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl,
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4, are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of at least one siloxane selected from the group consisting of
• (a) a siloxane corresponding to formula (II) wherein ##STR38## R is hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• B is R or A,
• r, s and t independently denote an integer of zero to 200.
• and (b) a siloxane corresponding to formula (III) ##STR39## wherein R.denotes C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• u is an integer from 1 to 20,
• v and w denote an integer of from zero to 20 and
• u+v+w.gtoreq.3, and wherein
• A denotes a C.sub.1 -C.sub.20 -alkyl or a C.sub.6 -C.sub.10 -aryl, and
• (iii) at least one member selected from the group consisting of mold release agent, dye, pigment, UV-absorber, flame retardant, stabilizer and filler.

A thermoplastic molding composition consisting of

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR40## wherein R.sup.1 and R.sup.2 denote, indepndently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4, are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of a siloxane corresponding to formula (II) ##STR41## wherein R denotes hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl or C.sub.1 -C.sub.10 -alkoxy,
• B is R or A,
• r, s and t independently denote an integer of zero to 200, and wherein
• A denotes a C.sub.1 -C.sub.20 -alkyl or a C.sub.6 -C.sub.10 -aryl group, and
• (iii) at least one member selected from the group consisting of mold release agent, dye, pigment, UV-absorber, flame retardant, stabilizer and filler.

A thermoplastic molding composition consisting of

• (i) an aromatic polycarbonate resin having a weight average molecular weight of at least 10,000, containing bifunctional carbonate structural units corresponding to formula (Ia) ##STR42## wherein R.sup.1 and R.sup.2 denote, independently of one another hydrogen, halogen, C.sub.1 -C.sub.8 -alkyl, C.sub.5 -C.sub.6 -cycloalkyl, C.sub.6 -C.sub.10 -aryl or C.sub.7 -C.sub.12 -aralkyl
• m denotes an integer from 4 to 7, and
• R.sup.3 and R.sup.4, are selected individually for each X and denote independently of one another hydrogen or C.sub.1 -C.sub.6 -alkyl, and
• X denotes carbon,
• with the condition that R.sup.3 and R.sup.4 both denote alkyl on at least one X atom, and
• (ii) about 0.001 to 1% by weight of a siloxane corresponding to formula (III) ##STR43## wherein R is hydrogen, C.sub.1 -C.sub.20 -alkyl, C.sub.6 -C.sub.10 -aryl, C.sub.1 -C.sub.10 -alkoxy,
• u is an integer from 1 to 20,
• v and w denote an integer of from zero to 20, and
• u+v+w.gtoreq.3, and wherein
• A denotes a C.sub.1 -C.sub.20 -alkyl or a C.sub.6 -C.sub.10 -aryl group, and
• (iii) at least one member selected from the group consisting of mold release agent, dye, pigment, UV-absorber, flame retardant, stabilizer and filler.