Abstract: Thermoplastic molding compositions comprising A) from 10 to 69% by weight of a thermoplastic polyester B) from 30 to 79% by weight of an aluminum oxide C) from 0.01 to 10% by weight of an organic or inorganic acid or mixture of these D) from 0 to 10% by weight of D1) at least one highly branched or hyperbranched polycarbonate with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, part 2), or D2) at least one highly branched or hyperbranched polyester of AxBy type, where x is at least 1.1 and y is at least 2.1, or a mixture of these E) from 0 to 50% by weight of other additives, where the entirety of the percentages by weight of components A) to E) gives 100%.

Abstract: Thermoplastic molding compositions comprising A) from 10 to 69% by weight of a thermoplastic polyester B) from 30 to 79% by weight of an aluminum oxide C) from 0.01 to 10% by weight of an organic or inorganic acid or mixture of these D) from 0 to 10% by weight of D1) at least one highly branched or hyperbranched polycarbonate with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, part 2), or D2) at least one highly branched or hyperbranched polyester of AxBy type, where x is at least 1.1 and y is at least 2.1, or a mixture of these E) from 0 to 50% by weight of other additives, where the entirety of the percentages by weight of components A) to E) gives 100%.

Abstract: Thermoplastic molding compositions comprising A) from 10 to 69% by weight of a thermoplastic polyester B) from 30 to 79% by weight of an aluminum oxide C) from 0.01 to 10% by weight of an organic or inorganic acid or mixture of these D) from 0 to 10% by weight of D1) at least one highly branched or hyperbranched polycarbonate with an OH number of from 1 to 600 mg KOH/g of polycarbonate (to DIN 53240, part 2), or D2) at least one highly branched or hyperbranched polyester of AxBy type, where x is at least 1.1 and y is at least 2.1, or a mixture of these E) from 0 to 50% by weight of other additives, where the entirety of the percentages by weight of components A) to E) gives 100%.

Abstract: A pressure device for recording media in tape form, in particular magnetic tapes, has at least one pressure element and comprises a support element. When the device is actuated by the head coming to bear, a deflection of the device takes place, and a pressing against the recording medium is effected automatically by at least one extension of the support element, this pressing ending automatically when the head is no longer in bearing contact. The bearing pressure may take place directly on the tape rear side or tape front side, or else indirectly on the tape front side or the tape rear side or both sides simultaneously. Pressing and/or antifriction and/or cleaning elements may also be arranged, at least partially, fixed in place with respect to the tape. The invention can be used in the case of all cassettes, film and magnetic-tape systems.