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    • 4. 发明授权
    • Thermoplastic polyester molding materials having low-temperature impact
strength
    • 具有低温冲击强度的热塑性聚酯成型材料
    • US4880876A
    • 1989-11-14
    • US188763
    • 1988-05-02
    • Hans-Henning HubGeorg N. SimonGerhard HeinzWalter ZieglerJuergen Sadlowski
    • Hans-Henning HubGeorg N. SimonGerhard HeinzWalter ZieglerJuergen Sadlowski
    • C08L23/08C08L1/00C08L7/00C08L21/00C08L23/00C08L27/00C08L33/00C08L33/02C08L51/00C08L51/02C08L51/04C08L67/00C08L67/02C08L69/00C08L101/00
    • C08L67/02C08L69/00
    • Thermoplastic polyester molding materials having low-temperature impact strength essentially consist of(A) from 20 to 79 parts by weight of one or more aliphatic polyesters of an aromatic dicarboxylic acid having a relative viscosity of from 1.2 to 1.8,(B) from 20 to 79 parts by weight of one or more aromatic polycarbonates having a relative viscosity of from 1.2 to 1.5,(C) from 1 to 40 parts by weight of an elastomer blend consisting of1. from 5 to 95% by weight of an ethylene copolymer composed of(a) from 40 to 99% by weight of ethylene and(b) from 1 to 60% by weight of one or more comonomers containing carboxyl groups and/or derivatives of carboxyl groups, and2. from 5 to 95% by weight of an elastomeric graft polymer which is prepared by emulsion polymerization and composed of(a) from 70 to 95% by weight of a substantially crosslinked grafting base having a glass transition temperature T.sub.g below -20.degree. C. and(b) from 5 to 30% by weight of a graft shell consisting of one or more polymers having a glass transition temperature T.sub.g higher than 20.degree. C., the amounts of components (A) to (C) summing to 100 parts by weight, and the amounts of components (1a) and (1b) and (2a) and (b) each summing to 100% by weight, and(D) if required, conventional additives in effective amounts.
    • 具有低温冲击强度的热塑性聚酯成型材料基本上由(A)20〜79重量份的一种或多种相对粘度为1.2〜1.8的芳族二羧酸的脂肪族聚酯,(B)为20〜 79重量份的相对粘度为1.2〜1.5的一种或多种芳族聚碳酸酯,(C)1〜40重量份弹性体共混物,由1〜5重量%〜95重量%的乙烯共聚物组成 (a)40至99重量%的乙烯和(b)1至60重量%的一种或多种含羧基和/或羧基衍生物的共聚单体,和2.5至95重量% 的弹性体接枝聚合物,其通过乳液聚合制备,并由(a)70至95重量%的玻璃化转变温度Tg低于-20℃的基本交联的接枝碱和(b)5至30 由1或1组成的移植物壳的重量% 玻璃化转变温度Tg高于20℃的聚合物,组分(A)至(C)的量相加于100重量份,组分(1a)和(1b)和(2a)的量和 (b)每个总计100重量%,和(D)如果需要,有效量的常规添加剂。
    • 8. 发明授权
    • Call concentrator with automatic line supervisor
    • 带有自动线路主管的呼叫集中器
    • US4527011A
    • 1985-07-02
    • US369915
    • 1982-04-19
    • Walter Ziegler
    • Walter Ziegler
    • H04M3/22H04M3/51H04M3/50H04Q3/60
    • H04M3/5166H04M3/2272
    • An automatic line supervisor is disclosed for a telephone system having a line concentrator which converges a plurality of subscriber lines into a single output line to a telephone answering service (TAS) which is coupled to the concentrator by a telephone line with automatic ring down (ringing tie line). In order for the line to properly operate after the TAS has answered a subscriber call, and gone back on hook, the telephone concentrator must be disconnected from the ringing tie line and from the caller. In a first embodiment, the automatic line supervisor is an integral part of the concentrator and operates to make the requisite disconnection of the concentrator from the ringing tie line and the caller on a subscriber line by monitoring the tie line for appropriate audio tones, generating a control signal either in response to the presence of a dial tone for a particular time interval or in response to the absence of DTMF tones (dual tone multifrequency) for a particular time interval. The control signal is used to open appropriate relays to disconnect the line concentrator from the caller and the ringing tie line to prepare the ringing tie line for ringing the TAS that another call is present. In the second embodiment, the automatic line supervisor is a separate device which is located at the TAS. The second embodiment monitors the current flow in the ringing tie line coupling the telephone concentrator with the TAS to sense the discontinuance of current flow which is indicative of the operator going on hook. When the discontinuance of current flow is sensed, a control signal is produced which is coupled to the telephone concentrator via the tie line. The control signal is sensed at the concentrator and initiates the opening of the requisite switches to disconnect the concentrator from the ringing tie line and the subscriber line.
    • 公开了一种用于具有线路集中器的电话系统的自动线路管理器,线路集线器将多个用户线路收敛到单个输出线路到电话应答服务(TAS),该电话应答服务(TAS)通过具有自动下线(振铃)的电话线耦合到集中器 连线)。 为了使线路在TAS应答用户呼叫之后正常工作,并且重新挂断,电话集线器必须与振铃线和来电者断开连接。 在第一实施例中,自动线路管理器是集中器的组成部分,并且通过监视适合的音频音调的连接线来操作以使集中器与呼入线路和呼叫者在用户线路上必需的断开连接,从而产生 响应于特定时间间隔中的拨号音的存在或者响应于特定时间间隔的DTMF音调(双音多频)的响应,控制信号。 控制信号用于打开适当的继电器,以将线路集中器与呼叫者和呼叫连接线断开,以准备振铃连线,用于振铃另一个呼叫存在的TAS。 在第二实施例中,自动线路监控器是位于TAS处的单独设备。 第二实施例监视将电话集中器与TAS耦合的环形连接线中的电流,以感测指示操作者挂钩的电流的中止。 当感测出电流中断时,产生通过连接线耦合到电话集线器的控制信号。 在集中器处感测到控制信号,并启动必要的开关的断开,以使集中器与环形连接线和用户线路断开连接。