A phosphorus-containing polyester composite and method of manufacturing the same is related to the field of compound formulation. The composite is prepared by condensation under certain conditions of (A) a poly-functional phosphorus-containing aromatic hydroxy compound; (B) a difunctional aromatic acryl chloride compound and (C) a monofunctional aromatic phenol compound used as a blocking agent. The composite is used as a curing agent for epoxy. The phosphorus-containing polyester composite is reacted with the epoxy group of the epoxy to obtain non-halogen and flame-retardant cured composite being environment friendly and having low dielectric, low dielectric loss factor and high heat resistance. It can be used in an integrated circuit board and used as a semiconductor packaging material.

A phosphorus-containing polyester composite and method of manufacturing the same is related to the field of compound formulation. The composite is prepared by condensation under certain conditions of (A) a poly-functional phosphorus-containing aromatic hydroxy compound; (B) a difunctional aromatic acryl chloride compound and (C) a monofunctional aromatic phenol compound used as a blocking agent. The composite is used as a curing agent for epoxy. The phosphorus-containing polyester composite is reacted with the epoxy group of the epoxy to obtain non-halogen and flame-retardant cured composite being environment friendly and having low dielectric, low dielectric loss factor and high heat resistance. It can be used in an integrated circuit board and used as a semiconductor packaging material.

The present invention provides an active ester resin containing a phosphorus atom capable of providing a cured product having all of flame retardancy, heat resistance, and dielectric characteristics, an epoxy resin composition containing the same as a curing agent, a cured product thereof, a prepreg, a circuit board, and a build-up film. The active ester resin containing a phosphorus atom has Structure (I) in which a structural unit () in which a plurality of aromatic nuclei (X) are connected through an alicyclic hydrocarbon group is connected with another structural unit () through an arylene dicarbonyloxy group, and, at least one of the aromatic nuclei (X) present in the resin has a structural site (Y) represented by any one of the following Structural Formulas (y1) to (y4) as a substituent on the aromatic nucleus. ##STR00001##

The present invention provides an active ester resin containing a phosphorus atom capable of providing a cured product having all of flame retardancy, heat resistance, and dielectric characteristics, an epoxy resin composition containing the same as a curing agent, a cured product thereof, a prepreg, a circuit board, and a build-up film. The active ester resin containing a phosphorus atom has Structure (I) in which a structural unit () in which a plurality of aromatic nuclei (X) are connected through an alicyclic hydrocarbon group is connected with another structural unit () through an arylene dicarbonyloxy group, and, at least one of the aromatic nuclei (X) present in the resin has a structural site (Y) represented by any one of the following Structural Formulas (y1) to (y4) as a substituent on the aromatic nucleus. ##STR00001##

A flame-retardant polyhydroxyalkanoate (PHA) material having a phosphate-terminated side-chain is disclosed.

A flame-retardant polyhydroxyalkanoate (PHA) material having a phosphate-terminated side-chain is disclosed.

A phosphorus-containing polyester composite and method of manufacturing the same is related to the field of compound formulation. The composite is prepared by condensation under certain conditions of (A) a poly-functional phosphorus-containing aromatic hydroxy compound; (B) a difunctional aromatic acryl chloride compound and (C) a monofunctional aromatic phenol compound used as a blocking agent. The composite is used as a curing agent for epoxy. The phosphorus-containing polyester composite is reacted with the epoxy group of the epoxy to obtain non-halogen and flame-retardant cured composite being environment friendly and having low dielectric, low dielectric loss factor and high heat resistance. It can be used in an integrated circuit board and used as a semiconductor packaging material.

A phosphorus-containing polyester composite and method of manufacturing the same is related to the field of compound formulation. The composite is prepared by condensation under certain conditions of (A) a poly-functional phosphorus-containing aromatic hydroxy compound; (B) a difunctional aromatic acryl chloride compound and (C) a monofunctional aromatic phenol compound used as a blocking agent. The composite is used as a curing agent for epoxy. The phosphorus-containing polyester composite is reacted with the epoxy group of the epoxy to obtain non-halogen and flame-retardant cured composite being environment friendly and having low dielectric, low dielectric loss factor and high heat resistance. It can be used in an integrated circuit board and used as a semiconductor packaging material.

Polyester co-polyphosphonates including of phosphonates covalently incorporated with polyesters and methods for making such polyester co-polyphosphonates are described herein. The polyester co-phosphonates and compositions prepared from these compounds exhibit an excellent combination of processing characteristics, mechanical and fire resistant properties.

In an example, a process for the production of a flame-retardant polymer is disclosed. The process includes reacting a polyol with a phosphorus-containing material to produce a phosphorus-functionalized polyol derivative. The process further includes reacting the phosphorus-functionalized polyol derivative with a polyacid to form the flame-retardant polymer. Phosphorus is chemically bound to a polymer chain of the flame-retardant polymer.