Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Ethylenically unsaturated reactant admixed with either...
Patent
1980-08-28
1982-09-07
Lieberman, Allan
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Ethylenically unsaturated reactant admixed with either...
525 10, 528303, 528306, C08G 6352, C08L 6706
Patent
active
043484999
ABSTRACT:
Polyester resins are produced from unsaturated dicarboxylic anhydrides which are modified with a C.sub.10 hydrocarbon concentrate. They are superior to the known resins made by the hydrolysis method containing the hydrocarbon concentrate in that the dicarboxylic anhydrides used in the preparation of the resins are hydrolyzed with an amount of water always less than the amount of maleic anhydride and/or hydrocarbon on a molar basis. After the hydrocarbon addition reaction of the in situ generated acid, the reaction is heated to 140.degree. C. to 185.degree. C. in order to generate cyclopentadiene or similar C.sub.5 hydrocarbons and form endomethylene tetrahydrophthalic anhydride (carbic anhydride) or other similar Diels-Alder products from the remaining unreacted maleic anhydride and hydrocarbon, generally prior to the addition of other resin forming chemical intermediates e.g. polyols.
REFERENCES:
patent: 3347806 (1967-10-01), Zimmermann
patent: 3883612 (1975-05-01), Pratt et al.
patent: 3986992 (1976-10-01), Canning et al.
patent: 4029848 (1977-06-01), Nelson
patent: 4148765 (1979-04-01), Nelson
patent: 4233432 (1980-11-01), Curtis, Jr.
Zimmerman et al., "Die Modifizierung ungesattigter Polyester mit Dicyclopentadien" Fette-Seifen-Anstrichmittel 66, #9, 670-678, 1964.
Colley B. G.
Lieberman Allan
The Dow Chemical Company
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