Abstract: Disclosed is a sPS nanocomposite with improved crystallization properties and higher mechanical strength, which comprises a polymer matrix containing syndiotactic polystyrene (sPS), and a layered clay material uniformly dispersed in the polymer matrix. The layered clay material is intercalated with an organic onium cation and optionally along with a polymer or oligomer which is compatible or partially compatible with sPS. The interlayer distances of the layered clay material are at least 20 Å. The sPS nanocomposite can be prepared by ways of in-situ polymerization, melt blending, or solution blending. According to the invention, the layered clay material dispersed in the sPS matrix not only leads to higher mechanical strength, but also, surprisingly, improves crystallization properties of sPS.

Abstract: A low dielectric constant composition used in electric circuit boards is disclosed. The composition includes (a) 20-99.9 parts by weight of a functionalized syndiotactic styrene/para-alkystyrene copolymer having microfoaming when being cured; (b) 0.01-80 parts by weight of a mixture of epoxy resins; and (c) less than 50 parts by weight of a curing agent.

Abstract: The present invention provides a graft copolymer of a syndiotactic styrene/para-alkylstyrene copolymer, having the formula of 1

Abstract: A resin composition which increases the copper peeling strength and improves the dielectric properties of electric circuit boards is disclosed. The resin composition comprises: (a) 20-100 parts by weight of a syndiotactic polystyrene, (b) 1-40 parts by weight of a functionalized syndiotactic styrene-based copolymer having microfoaming when being cured, (c) 1-40 parts by weight of an epoxy-styrene copolymer, and (d) 0-40 parts by weight of an additive.

Abstract: An elevator control data intercommunication programmer including a main board equipped with master and slave CPUs for controlling the operation of the elevator, EEPROMs for providing operation data to the CPUs, a DSP for controlling vector operation of the elevator's motor, and a data communication port for data communication with an external microprocessor unit. Through the data communication port, data can be programmed in the EEPROMs, so that the elevator operation data (parameters) in the memory of a failed CPU can be copied to another CPU for replacement.

Abstract: A pen including a barrel, a spring supported refill mounted in the barrel, a pressure member pivoted to a longitudinal extension strip at one end of the barrel, an actuating member mounted around the longitudinal extension strip and moved between the barrel and the pressure member, and a spring mounted around the upper barrel section of the barrel and stopped between the lower barrel section of the barrel and the actuating member, wherein when the pressure member is turned outwards, the actuating member is forced downwards to push the refill out of the barrel; when the pressure member is turned inwards, the spring is released, and the actuating member is forced upwards by the spring, thereby causing the refill to be moved back into the inside of the barrel.