Novel processing aids for natural and synthetic rubber compounds

Claim 2

AN IMPROVED RUBBER PROCESSING AID COMPRISING: A. AN ALKALI OR AMINE SALT OF AN AROMATIC SULFONIC ACID HAVING THE GENERAL FORMULA:

Claim 3

A composition according to claim 1 wherein said thioether is a thiodicarboxylic acid or an ether thereof of the formula Y-CzH2z a (CO2R3)1 2)2 wherein Y is sulfur or -SCxH2xS-; x has a value of from 1 to 5; z has a value of from 1 to 2; a has a value of from 0 to 1; and R3 is hydrogen or lower alkyl.

Claim 4

A composition according to claim 2 wherein said thioether is thiodiglycolic acid.

Claim 5

A composition according to claim 2 wherein said thioether is thiodipropionic acid.

Claim 6

A composition according to claim 2 wherein said thioether is methylene bis(thioacetic acid).

Claim 7

A composition according to claim 2 wherein said thioether is dimethyl thiodipropionate.

Claim 8

A composition according to claim 2 wherein said thioether is thiodisuccinic acid.

Claim 9

A composition according to claim 1 wherein said thioether is thiodipropionitrile.

Claim 10

A composition according to claim 1 wherein said thioether is dibenzyl sulfide.

Claim 11

A composition according to claim 1 to which are added additional materials including aromatic esters, compounds with alcoholic and glycolic hydroxyl groups, potassium or sodium soaps of fats or fatty acids, a fatty acid, a metal soap of zinc, magnesium, calcium or barium, and a paraffin.

Claim 12

A composition according to claim 10 comprising from about 3 to about 15 percent of the alkali salt of said aromatic sulfonic acid, about 5 to about 25 percent of said long chain fatty organic acid, about 0.5 to about 1.5 percent thioether, about 7 to about 15 percent diphenylphthalate, about 10 to about 20 percent tetraethyleneglycol mono-nonylphenol ether, about 5 to about 10 percent tripropyleneglycol, about 5 to about 20 percent potassium stearate, about 4 to about 10 percent zinc oleate, up to 5 percent cetyl alcohol, and about 15 to about 20 percent petrolatum.

Claim 13

A liquid composition according to claim 10 comprising from about 20 to about 25 percent of the amine salt of said aromatic sulfonic acid, about 15 to about 25 percent of said long chain fatty organic acid, about 0.5 to about 15 percent thioether, about 5 to about 15 percent dipropyleneglycol dibenzoate, about 20 to about 25 percent tetraethylene glycol mono-nonylphenyl ether, about 5 to about 15 percent tripropylene glycol, and about 10 percent to about 20 percent mineral oil.

Claim 14

An improved rubber composition comprising a rubber base and rubber additives, wherein the improvement comprises a small but effective amount of a composition according to claim 1.

Claim 15

An improved method for compounding rubber comprising admixing rubber with an additive of the class consisting of pigments, fillers and vulcanizing agents, wherein the improvement comprises admixing a composition according to claim 1 with rubber at the beginning of the mixing cycle prior to mastication of the rubber and no later than the time when said rubber is admixed with said additive.

Claim 16

A composition according to claim 1 wherein said thioether has a boiling point in excess of 130*C and has the formula R1 - Y - R2 wherein Y is S or -SCxH2xS-; x has a value of from 1 to 5; and each of R1 and R2 is alkyl, aryl, alkaryl, aralkyl and substituted alkyl, aryl, alkaryl and aralkyl, said substituents being ether oxygen, carbonyl oxygen, cyano, amine nitrogen, and amide groups, each of said R1 and R2 containing no more than 12 carbon atoms.

Claim 17

A composition according to claim 15 wherein Y is -S-.

Claim 18

A composition according to claim 15 wherein Y is -SCH2S-.