Back to results
US 5,851,429 AGranted
Dispersions of waxy pour point depressants
AssigneeThe Lubrizol Corporation
InventorJames Steven Magyar
Life of this patent
Estimating the term…
Abstract
A liquid pour point depressant composition comprises a pour point depressant which is a solid at room temperature and which has a number average molecular weight of at least 500, and a liquid medium in which the material of pour point depressant is substantially insoluble at room temperature. The pour point depressant component is dispersed in the liquid medium.
Claims16
A homogenized liquid pour point depressant composition, comprising:
- (i) a pour point depressant comprising the reaction product of (a) an alkyl-substituted phenol wherein the alkyl group contains at least about 20 carbon atoms and (b) formaldehyde or a source therefor;
- said pour point depressant being a solid at 10.degree. C. and having a number average molecular weight of at least 500 and up to about 500,000, and
- (ii) an aqueous-glycol liquid medium in which the material of (i) is substantially insoluble at 10.degree. C.;
- wherein component (i) is dispersed in component (ii).
1 more element
A method for homogenizing a mixture of:
- (i) a pour point depressant comprising the reaction product of (a) an alkyl-substituted phenol wherein the alkyl group contains at least about 20 carbon atoms and (b) formaldehyde or a source therefor;
- said pour point depressant being a solid at 10.degree. C. and having a number average molecular weight of at least 500 and up to about 500,000, and
- (ii) an aqueous-glycol liquid in which the material of (i) is substantially insoluble at 10.degree. C.;
- comprising the steps of:
- (a) heating components (i) and (ii) to a temperature at which (i) is soluble in (ii) or is molten;
- (b) mixing the heated components;
- and
- (c) cooling the heated mixture to a temperature at which (i) is substantially insoluble in the liquid of (ii).
5 more elements
Dependencies are inferred from the claim text.