Flame retardant polymer compositions with excellent processing stability and flame retardant activity are obtained by incorporating into the polymer a flame retardant obtained by heating certain phosphonic acid salts at temperatures of 200 C. or higher and as flame retardant synergist melam or a melam derivative, which compositions are more readily processed under certain harsh conditions than similar compositions comprising similar synergists such as melem, melon and the like.

Flame retardant polymer compositions with excellent processing stability and flame retardant activity are obtained by incorporating into the polymer a flame retardant obtained by heating certain phosphonic acid salts at temperatures of 200 C. or higher and as flame retardant synergist melam or a melam derivative, which compositions are more readily processed under certain harsh conditions than similar compositions comprising similar synergists such as melem, melon and the like.

Object of the present invention is to provide halogen-free highly flame retardant styrene impact modified polymers able to perform V0 classification on thin items, according to international standard UL-94.

Object of the present invention is to provide halogen-free highly flame retardant styrene impact modified polymers able to perform V0 classification on thin items, according to international standard UL-94.

Methods for curing unsaturated polyesters or vinyl esters in compositions that include oligomeric phosphonates, and combinations thereof and compositions and cured polymers made by these methods are described herein.

Methods for curing unsaturated polyesters or vinyl esters in compositions that include oligomeric phosphonates, and combinations thereof and compositions and cured polymers made by these methods are described herein.

Disclosed is a polycarbonate resin a composition. The polycarbonate resin composition may simply and exactly improve appearance properties such as yellow index (Y.I), haze and the like, and thermal stability during a high-temperature process, and provide processability by reducing gas generation during molding, through provision of a relational formula of addition amounts of a hindered phenol-based compound and a phosphite-based compound which function as antioxidants when mixed with the polycarbonate resin.

Disclosed is a polycarbonate resin a composition. The polycarbonate resin composition may simply and exactly improve appearance properties such as yellow index (Y.I), haze and the like, and thermal stability during a high-temperature process, and provide processability by reducing gas generation during molding, through provision of a relational formula of addition amounts of a hindered phenol-based compound and a phosphite-based compound which function as antioxidants when mixed with the polycarbonate resin.

Disclosed is a polycarbonate resin a composition. The polycarbonate resin composition may simply and exactly improve appearance properties such as yellow index (Y.I), haze and the like, and thermal stability during a high-temperature process, and provide processability by reducing gas generation during molding, through provision of a relational formula of addition amounts of a hindered phenol-based compound and a phosphite-based compound which function as antioxidants when mixed with the polycarbonate resin.

The present invention relates to a polyester resin and a preparation method therefor. Specifically, provided, in an embodiment of the present invention, is a polyester resin including: a copolymer including a diacid moiety and a diol moiety; a phosphorus-based heat stabilizer; and a complementary colorant, wherein the diacid moiety includes a furandicarboxylic acid-based compound-derived moiety, the diol moiety includes an alkylene glycol-based compound-derived moiety, the phosphorus-based heat stabilizer includes an ester group at the terminal end thereof, and the complementary colorant includes a blue dye and a red dye.