Synthesis of polythiol polymer intermediates from polyunsaturate

Chemistry of carbon compounds – Miscellaneous organic carbon compounds

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427340, 427385, 156327, 156330, 428419, 20415918, 260 37R, 260 47EC, 260 775CR, 260 795C, 260609B, 260609R, 260830S, C08G 2300

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039403742

ABSTRACT:
Polythiols having more than two terminal and/or pendant thiol groups per polymer molecule are formed by the free radical catalyzed addition of a monomer system made up of either hydrogen sulfide or a dithiol alone or in combination with an acetylenic compound to a polyolefin having at least three olefin sites. The polyolefin is preferably a tri-terminal olefin. The polythiol products are liquid, essentially gel-free materials having number average molecular weights varying from 200 to 30000. The polyfunctional prepolymers of the invention can be cured to stable three-dimensional networks with inexpensive bi-functional oxidants such as lead dioxide. Additionally, prepolymer compositions having 3 or more pendant or terminal thiol groups per molecule when combined with polyfunctional organic reagents, such as diepoxides, form stable, high-tenacity adhesive systems.

REFERENCES:
patent: 3310527 (1967-03-01), De Acetis et al.
patent: 3505166 (1970-04-01), Jones et al.

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