Process for curing sulfhydryl-terminated thioether polymers

Details Process for curing sulfhydryl-terminated thioether polymers Process for curing sulfhydryl-terminated thioether polymers

1976-12-30

1978-04-04

Marquis, Melvyn I.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

20415918, 260 18R, 260 233, 260 285AS, 260 306R, 260 312R, 260 318Z, 260 336R, 260 336UA, 260 338R, 260 338UA, 260 37NP, 260 4243, 260 4246, 260 4247, 260 79, C08L 9100

Patent

active

040827127

ABSTRACT:
An improved process for curing sulfhydryl-terminated thioether polymers substantially devoid of aliphatic unsaturation having a sulfhydryl functionality of 2 to 3 to obtain thioether elastomers is disclosed wherein the liquid thioether is reacted with a curing amount of tertiary butyl perbenzoate. Preferably the curing reaction is carried out at about ambient temperature in the presence of a copper, especially a divalent copper, promoter for the reaction. The improved curing process shortens the curing time and extends the effective working life of the curing reaction mixture. The cured products are of enhanced thermal stability and are useful as elastomeric sealants such as architectural sealants.

REFERENCES:
patent: 3522221 (1970-07-01), Gardner et al.
patent: 3717618 (1973-02-01), Oswald
patent: 3843572 (1974-10-01), Morgan
patent: 3856645 (1974-12-01), Morgan

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