The Dow Chemical Company

Thomas E Dergazarian

Victor E Meyer

George A Lane

Disclosed herein are inert monovalent hydrocarbon terminated polysulfide copolymers having the general structure ##STR1## wherein n is an integer from about 2 to about 8, l is zero or a positive integer, m is a positive integer, each R is independently an organic polyradical with the radicals residing on carbon atoms, p is zero or a positive integer which is the difference between the number of radicals on R and 2, and each Y is a terminal substituent that is an inert monovalent hydrocarbon radical.

Inert monovalent hydrocarbon terminated polysulfide polymers

Blends of organic-terminated polysulfide elastomers and organic polymers are disclosed. The organic polymer may be a saturated organic elastomer, an ethylenically unsaturated organic elastomer, a non-elastomeric polymer, or any combination blend of the three. Said blends exhibit unexpectedly good tensile properties and resilience and are useful for forming gaskets, membranes, sealants, adhesives, hoses, tubing and similar articles.

Blends of organic polymers and organic terminated polysulfide polymers

Di(vinylaryl)alkyl polysulfides and curable, low odor (vinylaryl)alkyl-terminated polysulfide copolymers having the general structure ##STR1## wherein n is an integer from about 2 to about 8, 1 and m are positive integers, each R is independently an organic polyradical with the radicals residing on carbon atoms, p is zero or a positive integer which is the difference between the number of radicals on R and 2, and each Z is independently chosen from the class consisting of (vinylaryl)alkyl and other noncrosslinking monoradicals, provided that a sufficient proportion of the Z groups are (vinylaryl)alkyl that the polymer, when cured, does not cold flow. Additionally, a method of preparing said polymers and useful adhesive, sealant and caulking compositions made therefrom are disclosed.

(Vinylaryl)alkyl polysulfide polymers

Sym-tet (2,3,5,6-tetrachloropyridine) is selectively extracted from a reaction mixture comprising sym-tet, iodide ions and an aprotic solvent by contacting an extractant solvent with the reaction mixture. The extractant solvent is an alkane having at least six carbon atoms.

Selective solvent extraction of symmetrical tetrachloropyridine

Disclosed is a pyrotechnic composition and a method for the inflation of passive restraint systems, i.e., crash bags. The method utilizes gases produced by the ignition and burning of a pyrotechnic composition containing an alkali metal azide, a metal halide and an inorganic perchlorate.

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Midland, MI, United States of America

Thomas E Dergazarian