Novel modified polyphenylene ether-polyamide compositions comprising polyphenylene ether, polyamide and a polycarboxylic acid and the reaction product thereof and an improved process for preparing the same.

Modified polyphenylene ether-polyamide compositions and process

A free-flowing silicone polymer powder, having an average particle size of 1 to 1000 microns and prepared by mixing a polydiorganosiloxane with a silica filler, is uniformly dispersed in an organic resin using conventional equipment, such as a single screw or, preferably, a twin screw extruder. When employed at a concentration of about 0.5 to 25 parts by weight of powder per 100 parts by weight of resin, a significant improvement in the burn character of the modified resin is obtained such that the rate of heat release, generation of smoke and evolution of toxic carbon monoxide gas is significantly reduced relative to the unmodified resin.

Method for imparting fire retardancy to organic resins

Process for the manufacture of modified polyphenyl ether or structurally related polymers comprising the reaction of said compound with a para substituted phenylsulphonyl halide, in the presence of a substituted pyridine derivative as catalyst and an acid neutralizing agent, and in a vinyl substituted aromatic monomer as solvent; modified polyphenylene ethers or structurally related polymers so obtained and use of them for the manufacture of modified high temperature rigid poly(vinyl substituted aromatic) polymer compositions.

Process for preparation of modified polyphenylene ether or related polymers and the use thereof in modified high temperature rigid polymer of vinyl substituted aromatics

Poly(alkenyl substituted aromatic) and elastomer containing polymer compositions, obtainable by a process comprising: (a) conversion of polyphenylene ether or a structurally related polymer thereof with an acid halide, an acid anhydride or ketene, in at least one alkenyl substituted aromatic monomer; (b) dissolution of at least one EPDM rubber and an optionally partially hydrogenated diblock copolymer A--B, optionally mixed with minor amounts of triblock copolymers ABA, wherein A represents a poly(alkenyl aromatic) block and B represents an optionally, partially hydrogenated poly conjugated diene block; (c) prepolymerization of the obtained mixture until a polymerization degree of from 5 to 20%; (d) suspending the prepolymerized mass into an aqueous medium; (e) polymerization by thermal initiation or by initiation by means of at least one free radical initiator, optionally in the presence of an expanding agent; and a process for the preparation of such polymer compositions.

Poly(alkenyl substituted aromatic) and elastomer containing polymer compositions and process for their preparation

There is described a process for making a composition of a capped polyphenylene oxide and an alkenyl aromatic resin which is based on the thermal polymerization of an alkenyl aromatic monomer in the presence of a capped polyphenylene oxide

Compositions of capped polyphenylene oxides and alkenyl aromatic resins

A novel composition which has been improved in elongation and impact resistance is obtained by blending polyphenylene oxide with a small amount of a rubbery polymer, while said composition still retains excellent properties inherent to polyphenylene oxide itself, as they are, for example, thermal resistance, chemical resistance, mechanical and electrical properties. The amount of the rubbery polymer to be blended is less than 10 % by weight, preferably 0.5 to 5 % by weight, based on the weight of the whole composition. As the rubbery polymer, there may be used such rubbery polymers as obtained from conjugated diolefins, olefins, vinyl compounds and alkylene oxide. The above-mentioned two components of composition may be blended together according to a mechanical mixing method, solution mixing method or latex mixing method.

Rubber modified polyphenylene oxide composition

A relatively small amount of styrene can be smoothly graft-polymerized on a polyphenylene oxide with a high graft efficiency and in a high polymerization yield by polymerizing 0.4 to 2 parts by weight of a styrene compound in the presence of 1 part by weight of a polyphenylene oxide, or 15 to 60 parts by weight of a styrene compound in the presence of 40 to 85 parts by weight of a mixture comprising 74 to 96% by weight of a polyphenylene oxide and 26 to 4% by weight of a rubbery polymer, in an aqueous dispersion containing a dispersion stabilizer and a radical initiator.

Production of modified polyphenylene oxide

MODIFIED POLYPHENYLENE OXIDES EXCELLENT IN PROCESSABILITY AND MOLDABILITY ARE OBTAINED BY GRAFT-POLYMERIZING ON A POLYPHENYLENE OXIDE A STYRENE TYPE COMPOUND OR A MIXTURE OF THE STYRENE TYPE COMPOUND AND AN A-ALKYL SUBSTITUTION PRODUCT OF SAID COMPOUND, IN AN AQUEOUS DISPERSION CONTAING AN ANIONIC OR NONIONIC SURFACTANT, A RADICAL INITIATOR AND A SOLVENT FOR THE POLYPHENYLENE OXIDE.

Yoichi Kono

Papers

Rubber modified polyphenylene oxide composition

Production of modified polyphenylene oxide

Modified polyphenylene oxide and method for production thereof