Polyhalobenzylic disulfooxonium compounds are produced by the reaction of aromatic methyl, halomethyl or hydroxymethyl substituents with sulfur trioxide. The disulfooxonium salts are readily converted to alcohols by hydrolysis to provide monomers for the production of fire resistant polymers and additives for polymers. Likewise, the disulfooxonium compounds of this invention present chemical intermediates for a wide range of useful products such as halogenated pesticides.
Polyolefins, such as polyethylene and polypropylene, are rendered flame retardant by incorporating therein a combination of (1) a Diels-Alder adduct of a chlorinated cyclopentadiene and a polyunsaturated cycloaliphatic compound and (2) a ring-brominated aromatic compound.
Pre-exfoliated natural or synthetic, modified or unmodified layered materials are prepared by mixing layered materials with one or more plastics additives selected from the group consisting of ultraviolet light absorbers, hindered amine light stabilizers, antioxidants, colorants, flame retardants, antimicrobials and fatty acid additives and melt extruding the mixture. The layered materials are for example modified or unmodified layered silicate clays. The galleries of the layered materials in the mixtures are expanded to a level of less than full exfoliation. The melt extruded mixtures of layered materials and additives are highly useful to prepare polymer nanocomposites.
Polyolefin compositions useful for construction articles for outdoor use, for instance house siding, cladding, soffit or roofing. The compositions comprise a polyolefin substrate which has incorporated therein one or more additives selected from the group consisting of a) one or more ultraviolet light absorbers, b) one or more hindered amine light stabilizers and c) one or more antioxidants. Advantageously, the polyolefin substrate also has incorporated therein d) one or more colorants, e) one or more fillers, f) one or more flame retardants and optionally g) one or more antimicrobial compounds. The compositions exhibit certain performance levels according to standard tests, for example impact strength of >35 in-lb per ASTM D4226, coefficient of linear thermal expansion of <4.5×10E-05 in/in/ft per ASTM D696 and optionally acceptable color uniformity in finished siding parts per ASTM D6864 and/or acceptable low delta E color for the intended application per ASTM D2244 and/or a UL-94 V-1 or V-0 rating and/or a flame spread index of <200 according to ASTM E-84.