Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1974-10-18
1976-05-04
Marquis, Melvyn I.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
20415922, 2602855R, 260 318Z, 260 37R, 260 775CR, 260 795R, 260 795C, 260 797, 260609R, 260609B, C08F 2804
Patent
active
039547230
ABSTRACT:
Terminally difunctional branched polythioether polyadducts are prepared by reacting dithiols with acetylenes under free radical conditions. Inherent to their method of preparation, the novel polythioethers contain the divalent carbon skeletons derived from their dithiol and acetylene monomer components in a regularly alternating manner. Dependent on the dithiol acetylene monomer ratio, the novel polymers contain thiol and/or vinyl sulfide end groups. Owing to their reactive, diterminal functions, they can be chain extended and crosslinked via known reactions to elastomers useful as mastics.
The polymers are crosslinked by various novel methods. For example, one mole of polythioether dithiol is reacted with two moles of an epoxide to produce the corresponding polythioether diol. The latter is then reacted with a diisocyanate to form a polythioether polyurethane of superior thermal and oxidative aging stability.
REFERENCES:
patent: 2916519 (1959-12-01), Wegner et al.
patent: 3592798 (1971-07-01), Oswald
patent: 3625925 (1971-12-01), Oswald et al.
patent: 3717618 (1973-02-01), Oswald
Allocca Joseph J.
Exxon Research & Engineering Co.
Marquis Melvyn I.
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