Pennwalt Corporation

Atochem North America, Inc.

Gerald H Reifenberg

Joseph M Bohen

Daryl L Stein

Flame retardant compositions are provided containing at least one ester of a polyhaloaromatic acid and at least one polyolefin resin. The compositions may also contain one or more brominated and/or chlorinated compounds to provide additional flame retardancy, and other resins or engineering thermoplastics may be blended with the polyolefin. In addition to providing flame retardancy, the polyhaloaromatic acid esters are effective as processing and compatibilizing aids for the resin, and may also function as tackifiers, mold release agents, plastisole, adhesives, plasticizers, polymer additives, and aids in preventing melt fracture.

Polyhaloaromatic ester flame retardants for polyolefin resins

Flame retardancy of polyphenylene ether, polyolefin and polyethylene terphthalate resins and resin blends is increased by blending with the resin a flame retarding amount of a halogenated polyester which is the reaction product of a halogenated phthalic acid or phthalic anhydride with an epoxide or hydroxy compound containing at least two hydroxyl groups. The polyphenylene ether resin may include homopolymers or copolymers of polyphenylene ethers or blends of polyphenylene ethers with vinyl aromatic resins such as styrene polymers and copolymers. The flame retarding polyesters are also effective as processing aids in improving the flowability and moldability of the resins during melt processing.

Halogenated polyester flame retardants for polyphenylene ether,

Novel halogen-substituted phthalimides are provided which are the reaction product of a halogenated phthalic anhydride with an alkoxylated amine or the reaction product of a halogenated phthalic anhydride with a siloxy amine. The halogen-substituted phthalimides are useful in increasing the flame retardancy of thermoplastic and thermosetting resins, and are also effective as processing aids in improving the flowability and moldability of thermoplastic resins during melt processing.

Halogen substituted phthalimide flame retardants

A process is provided for preparing monohydrocarbyltin trihalides, RSnX.sub.3, wherein R is an alkyl, cycloalkyl, alkaryl, aryl or aralkyl group of 1-24 carbon atoms, and X is a halogen atom by the redistribution reaction between a tetrahydrocarbyltin, R.sub.4 Sn, a trihydrocarbyltin halide, R.sub.3 SnX, or a dihydrocarbyltin dihalide, R.sub.2 SnX.sub.2, and a tin tetrahalide, SnX.sub.4, in the presence of sulfonium or isothiuronium salts as catalysts.

Process for preparing monohydrocarbyltin trihalides

A process is provided for preparing dimethyltin dichloride by the reaction of tin metal and methyl chloride in the presence of sulfonium or isothiuronium salts as catalysts.

Process for preparing dimethyltin dichloride

A process for preparing alkaline earth metal mercaptides in a two-step process, useful as synergists for organotin stabilizers in halogen containing resins such as polyvinyl chloride, comprising: (1) reacting a metallic oxide or hydroxide of the metal desired in the final mercaptide; a magnesium, aluminum or calcium alkoxide; and an alcohol to provide an alkoxide of the metal of the final mercaptide; and then (2) reacting the final alkoxide of (1) with a mercaptan to provide the desired metal mercaptide.

Growing community of inventors

East Windsor, NJ, United States of America

Gerald H Reifenberg