Water-dispersible defoamer composition

Claim 1

An intimately admixed defoamer composition, comprising: a. a mixture of active defoamer components consisting of: i. from about 25 to about 60% by weight of a monoester of the formula: ##STR4## wherein R is at least one long chain alkenyl group having a total of at least 12 carbon atoms and the formula: R" -- CH = CH -- CH.sub.2 -- where R" is a linear or primary branched chain alkyl group, and R' is at least one alkyl group containing at least 12 carbon atoms, ii. from about 15 to about 65% by weight of an organo-phosphorus compound selected from the group consisting of n-tributylphosphate, n-tributoxyethylphosphate and triphenyl phosphite, iii. from about 2 to about 20% by weight of a silicone oil, iv. from 0 up to about 45% by weight of the other active defoamer components of a 25% by weight solution of a copolymer of vinyl acetate and fumaric acid which has been esterified with tallow alcohol in a hydrocarbon mineral oil, and b. at least one surfactant effective to impart water dispersibility to said defoamer composition.

Claim 18

A method of forming a defoamer composition, which comprises: heating a monoester of the formula: ##STR6## where R is at least one long chain alkenyl group having a total of at least 12 carbon atoms and the formula: R" -- CH = CH -- CH.sub.2 -- where R" is a linear or primary branched chain alkyl group, and R' is at least one alkyl group containing at least 12 carbon atoms, to a temperature above its melting point and at least 130° C but below the decomposition temperature thereof, adding water to said heated monoester and agitating the same to cause a rapid volume increase and froth formation and cooling of monoester by at least 20° C, heating the spongy mass with agitation to remove residual water therefrom, and intimately mixing a silicone oil and an organo-phosphorus compound selected from the group consisting of n-tributyl phosphate, n-tributoxy ethylphosphate and triphenyl phosphite, with the resulting anhydrous mass, mixing the resulting mixture with at least one surfactant effective to impart water dispersibility to the resulting defoamer composition and agitating the mixture to form an intimately blended mixture, and cooling the intimate blend to ambient temperature, said monoester, organo-phosphorus compound and silicone oil being used in proportions such that the resulting defoamer composition contains a mixture of active defoamers comprising about 25 to about 60 percent by weight of said monoester, about 15 to about 65% by weight of said organo-phosphorus compound and about 2 to about 20% by weight of said silicone oil.

Claim 19

A method of forming a defoamer composition, which comprises: heating a monoester of the formula: ##STR6## where R is at least one long chain alkenyl group having a total of at least 12 carbon atoms and the formula: R" -- CH = CH -- CH.sub.2 -- where R" is a linear or primary branched chain alkyl group, and R' is at least one alkyl group containing at least 12 carbon atoms, to a temperature above its melting point and at least 130° C but below the decomposition temperature thereof, adding water to said heated monoester and agitating the same to cause a rapid volume increase and froth formation and cooling of monoester by at least 20° C, heating the spongy mass with agitation to remove residual water therefrom, and intimately mixing a silicone oil and an organo-phosphorus compound selected from the group consisting of n-tributyl phosphate, n-tributoxy ethylphosphate and triphenyl phosphite, with the resulting anhydrous mass, mixing the resulting mixture with at least one surfactant effective to impart water dispersibility to the resulting defoamer composition and agitating the mixture to form an intimately blended mixture, and cooling the intimate blend to ambient temperature, said monoester, organo-phosphorus compound and silicone oil being used in proportions such that the resulting defoamer composition contains a mixture of active defoamers comprising about 25 to about 60 percent by weight of said monoester, about 15 to about 65% by weight of said organo-phosphorus compound and about 2 to about 20% by weight of said silicone oil.