Stauffer Chemical Company

Jesse C Hwa

Paul Kraft

Jung Il Jin

Leonard Feiler

There is disclosed a process for forming modified polymers of: (1) a bis(hydrocarbyl) vinylphosphonate; (2) optionally, a crosslinking monomer containing two or more ethylenically unsaturated bonds; and (3) optionally, one or more comonomers which contain one ethylenically unsaturated bond. The products formed by this process which contain any of the above mentioned monomers are substantially free of unreacted residual bis(hydrocarbyl) vinylphosphonate. The process comprises the post-addition of a monoethylenically unsaturated monomer, the monomer being selected from the group consisting of the vinyl and vinylidene chlorides and bromides and the C.sub.1 -C.sub.20 dialkyl esters of maleic and fumaric acids, to the polymerization medium containing the vinylphosphonate and any optional monomers after the percent conversion of monomers in the polymerization medium has exceeded about 40%.

Process for forming fire retardant polymers of bis (hydrocarbyl)

The invention is a method of stabilizing a reaction mixture of a polythiol and sulfur. The method comprises contacting said reaction mixture with an effective amount of a stabilizing agent selected from the group consisting of epoxides, acid anhydrides and mixtures thereof.

Method of stabilizing polythiol reaction products

Aqueous suspensions of discrete particles of polymer, for instance polyvinyl latices, are heated with solvents which are at least partially water-miscible, particularly certain shortchain ketones, until the polymer is agglomerated to the desired degree. Various water-soluble inorganic metal salts, especially alkali metal and alkaline earth metal halides and sulfates, may also be added to facilitate the agglomeration. Novel macromolecular resins of high absorptivity are thus produced, comprising the fine particles of polymer cofused in a reticulated structure, the degree of cofusion being controlled at will by the process conditions selected.

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Stamford, CT, United States of America

Jesse C Hwa