Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1977-11-21
1979-08-07
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
260609R, 528374, 528376, 528378, 528380, C08G 1800
Patent
active
041638328
ABSTRACT:
Episulfides are reacted with mono, di or trithiols in the presence of tertiary aliphatic amines or tertiary aliphatic phosphines, to form corresponding thioether thiols by a highly selective anionic mechanism. Increasing episulfide-thiol ratios result in polythioether thiols of increasing molecular weights. Using two or more episulfides, block copolymers can be prepared. The reactive terminal thiol functionality and the segmented crystalline and amorphous block structure of the new polymers makes them particularly useful for castable rubber applications.
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Exxon Research & Engineering Co.
Halluin Albert P.
Marquis Melvyn I.
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