Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1990-07-05
1992-12-22
Bleutge, John C.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
505535, C08F28300, C08F28306
Patent
active
051735490
ABSTRACT:
An improved process for reacting a mercaptanterminated aliphatic polysulfide resin with excess epichlorohydrin in the presence of alkali to form an expoxidized polysulfide is disclosed. The reaction takes place in the absence of a solvent such as ethyl alcohol or ether, which will form an inseparable azeotrope with epichlorohydrin and water. The reaction is carried out at a temperature and pressure sufficient to distill away epichlorohydrin and by-product water. The water and epichlorohydrin are separated and the epichlorohydrin is returned to the pot during the reaction. After the reaction is complete, the epichlorohydrin is stripped, leaving an epoxidized polysulfide, by-product sodium chloride, and residual alkali. The epoxidized polysulfide is dissolved in a work-up solvent and filtered to remove sodium chloride and alkali. Then the work-up solvent is stripped, leaving a purified product.
REFERENCES:
patent: 2731437 (1956-01-01), Bender et al.
patent: 3640965 (1972-02-01), Brode et al.
patent: 3980679 (1976-09-01), Becker
patent: 4366307 (1982-12-01), Singh et al.
patent: 4829133 (1989-05-01), Hefner, Jr. et al.
W. Charmas and W. Podkoscielny, J. Applied. Polym. Sci., 25, 2393-2406 (1980).
Fujisawa et al., "Synthesis of Poly(4-Hydroxy-3,5-Di-t-Butylphenyl Glycidyl Thioether)", Polymer Letters Ed., vol. 12, pp. 557-559 (1974).
Booth David L.
Stowell James K.
Bleutge John C.
LaMarre Mark F.
Lee Helen F.
Morton International Inc.
White Gerald K.
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