Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1987-07-08
1989-03-21
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
5253302, 525366, 525367, 525368, 525369, 525380, C08F 842
Patent
active
048143898
ABSTRACT:
An aqueous drilling fluid having present in an amount sufficient to disperse the fluid and to provide resistance to high temperatures and solids contamination of the drilling fluid, at least one salt of a polymer or copolymer of acrylic or methacrylic acid with alkanolamine, alkylamine, mixtures of alkanolamine and alkylamine, mixtures of lithium and alkanolamine, mixtures of lithium and alkylamine and mixtures of lithium, alkanolamine and alkylamine, the polymer having a weight average molecular weight of between about 2,000 and about 15,000 and a pH of from about 6 to about 8.5 and where mixtures of lithium and alkanolamine, lithium and alkylamine or mixtures of lithium, alkanolamine and alkylamine are used, the amount of lithium is present to give from about 30% to about 70% of the desired neutralization of the polymer and the alkanolamine and/or alkylamine is present to give from about 70% to about 30% of the desired neutralization of the polymer.
REFERENCES:
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patent: 2718497 (1955-09-01), Oldham et al.
patent: 4370171 (1983-01-01), Robinson et al.
patent: 4507422 (1985-03-01), Farrar et al.
patent: 4554307 (1985-11-01), Farrar et al.
U. D. Mamadzhanov et al in Tr. VNII Ekon., Organiz. Proiz-Va Tekhn.-Ekon. Inform. V Gaz. Prom-Sti (1974), pp. 114-117.
Garvey Christopher M.
Savoly Arpad
Weatherford Thomas M.
Diamond Shamrock Chemicals Company
Jaeschke Wayne C.
Levin Neal T.
Lipman Bernard
Schofer Joseph L.
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