Abstract: A series of novel phosphorus-containing compounds having the following formula is provided: in which: R1-R4, A, Q and m are as defined in the specification. A process for the preparation of the compound of formula (I) is also provided. A polymer of formula (PA), and preparation process and use thereof are further provided. A polymer of formula (PI), and preparation process and use thereof are also provided.

Abstract: A method and system for detecting an insufficient coverage location in a mobile network is provided to detect the insufficient coverage location in a systematic and efficient way. The method generates a corresponding cell list for a registered address of a subscriber of the mobile network, where the cell list comprises at least one cell that potentially covers the registered address. Next, the call detail record (CDR) entries associated with the cell list are extracted. Then, it is determined whether the registered address is an insufficient coverage location of the mobile network according to the error codes included in the extracted CDR entries.

Abstract: A series of novel phosphorus-containing compounds having the following formula are disclosed: wherein R1-R12, A, B, D, X, and Y are as defined in the specification. A process for the preparation of the compound of formula (1), a curing agent, and a flame resistant epoxy resin and a preparation process thereof are also provided.

Abstract: An active-hydrogen-containing (carboxyl or hydroxyl) phosphorus compound is provided. An epoxy resin semi-thermoset formed by bonding the phosphorus compound to an epoxy group is also provided. A flame-retardant epoxy resin thermoset is formed after reacting the epoxy resin semi-thermoset with a curing agent. The epoxy resin thermoset possesses excellent flame retardancy, heat stability, and high glass transition temperature (Tg), does not produce toxic and corrosive fumes during combustion, and thus is an environmentally friendly flame-retardant material.

Abstract: The present invention provides phosphorus-based oxazine compounds and the preparation method thereof. The phosphorus-based oxazine compounds of the present invention can provide better fire-resistant characteristics, while the preparation method for the phosphorus-based oxazine compound of the present invention can offer high yields and/or high purity phosphorus-based oxazine compounds.

Abstract: A series of novel phosphorus-containing compounds having the following formula are disclosed: wherein Q, R5, Ar1, Ar2, A, and B are as defined in the specification. The present invention provides a process for the preparation of the compound of formula (I). The present invention also provides a compound of formula (PA) and a process for preparing the same. The present invention further provides a compound of formula (PI) and a process for preparing the same.

Abstract: The present invention provides phosphorus-based oxazine compounds and the preparation method thereof. The phosphorus-based oxazine compounds of the present invention can provide better fire-resistant characteristics, while the preparation method for the phosphorus-based oxazine compound of the present invention can offer high yields and/or high purity phosphorus-based oxazine compounds.

Abstract: Processes of synthesizing aromatic amine-based benzoxazine resins are disclosed. The processes provide new routes for synthesizing benzoxazine from aromatic diamines or multifunctional aromatic amines that may solve the problem of insoluble products resulted from the condensation of hydroxymethylamine with amine by using aromatic diamine, phenol and formaldehyde as a raw materials.

Abstract: A method of manufacturing new materials for a printed circuit board and Low-Earth Orbit (LEO) spacecraft is provided. The present invention includes dinitro, diamine, various phosphorous-containing polyimides and polyamides, and synthesizing methods thereof. The polymers of the embodiment of present invention exhibit good flame retardancy, high glass transition temperature, good mechanical properties and superior oxygen resistance, so they are good materials for Low-Earth Orbit applications. Besides, these polymers can also be used as matrix for halogen-free flexible printed circuit board.

Abstract: The present invention discloses an active-hydrogen-containing phosphorus compound for cross-linking a resin and for imparting flame-retardancy to the cured resin, and in particular to a cured frame-retardant epoxy resin prepared by reacting the hardener with a di- or poly-functional epoxy resin via an addition reaction between the active hydrogen and the epoxide group. The present invention also discloses an epoxy resin made from the active-hydrogen-containing phosphorus compound and epihalohydrin.

Abstract: The present invention discloses an active-hydrogen-containing phosphorus compound for cross-linking a resin and for imparting flame-retardancy to the cured resin, and in particular to a cured frame-retardant epoxy resin prepared by reacting the hardener with a di- or poly-functional epoxy resin via an addition reaction between the active hydrogen and the epoxide group. The present invention also discloses an epoxy resin made from the active-hydrogen-containing phosphorus compound and epihalohydrin.

Abstract: A flame-retardant epoxy resin was prepared by reacting an active-hydrogen-containing phosphorus compound with a di- or poly-functional epoxy resin via an addition reaction between the active hydrogen and the epoxide group, is suitable for printed circuit board and semiconductor encapsulation applications.

Abstract: A flame-Retardant advanced epoxy resin was prepared by reacting an active-hydrogen-containing phosphorus compound with a di- or poly-functional epoxy resin via an addition reaction between the active hydrogen and the epoxide group, which has a high glass transition temperature (Tg), high decomposition temperature and high elastic modulus and thus is suitable for printed circuit board and semiconductor encapsulation applications by curing with a curing agent.