Bile salts which control kogation in thermal ink-jet inks

Claim 3

The method of claim 1 wherein said bile salt has the formula ##STR3## wherein R 1 is selected from the group consisting of O--, NH--CH 2 --COO--, and NH--(CH 2 ) 2 --SO 3 --, R 2 and R 3 are independently selected from the group consisting of OH and H, and R 4 is OH.

Claim 4

The method of claim 2 wherein said bile salt is selected from the group consisting of ______________________________________ Name R.sub.1 R.sub.2 R.sub.3 R.sub.4 ______________________________________ cholate O.sup.- OH OH OH deoxycholate O.sup.- OH H OH chenodeoxycholate O.sup.- H OH OH glycholate NH--CH.sub.2 --COO.sup.- OH OH OH taurocholate NH--(CH.sub.2).sub.2 --SO.sub.3.sup.- OH OH OH. ______________________________________

Claim 5

The method of claim 3 wherein each molecule of said bile salt has a cation associated therewith selected from the group consisting of lithium, potassium, cesium, sodium, magnesium, manganese, ammonium, and quaternary ammonium salts.

Claim 6

The method of claim 4 wherein said bile salt consists essentially of sodium cholate.

Claim 7

The method of claim 1 wherein the concentration of said bile salt is about 0.5 wt% of said ink.

Claim 8

The method of claim 1 wherein said ink comprises about 0.5 to 5 wt% of a water-soluble, anionic dye, about 1 to 15 wt% of a member selected from the group consisting of glycols and lactams, and the balance water.

Claim 9

The method of claim 7 wherein said glycol is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, and mixtures thereof.

Claim 10

The method of claim 7 wherein said lactam is selected from the group consisting of 2-pyrrolidone, N-pyrrolidone, N-methyl pyrrolidone, N-hexyl pyrrolidone, N-(2-hydroxyethyl)pyrrolidone, caprolactam, and mixtures thereof.

Claim 11

The method of claim 1 wherein said ink further comprises about 0.1 to 0.3 wt% of an alginate, about 0.5 to 5 wt% of a zwitterionic surfactant, and 0 to about 5 wt% of an acetylenic polyethylene oxide surfactant.

Claim 14

The method of claim 11 wherein the concentration of said sodium cholate is about 0.5 wt%.

Claim 15

The method of claim 11 wherein said ink comprises about 0.5 to 5 wt% of a water-soluble, anionic dye, about 1 to 15 wt% of a member selected from the group consisting of glycols and lactams, and the balance water.

Claim 16

The method of claim 13 wherein said glycol is selected from the group consisting of diethylene glycol and 1,5-pentanediol, and wherein said lactam is 2-pyrrolidone.

Claim 17

The method of claim 11 wherein said ink further comprises about 0.1 to 0.3 wt% of sodium alginate, about 0.5 to 5 wt% of N,N-dimethyl-N-(Z-9-octadecenyl)-N-amine oxide, and 0 to about 5 wt% of an acetylenic polyethylene oxide surfactant.

Claim 18

The method of claim 4 wherein said quaternary ammonium salts are selected from the group consisting of tetramethylammonium and tetrabutylammonium salts.

Claim 19

A thermal ink-jet ink comprising a vehicle and at least one dye and containing about 0.1 to 3 wt% of a bile salt.

Claim 20

A thermal ink-jet ink comprising a vehicle and at least one dye and containing about 0.1 to 3 wt% of a bile salt.

Claim 21

The ink of claim 17 wherein said bile salt has the formula ##STR4## wherein R 1 is selected from the group consisting of O--, NH--CH 2 --COO--, and NH--(CH 2 ) 2 --SO 3 --, R 2 and R 3 are independently selected from the group consisting of OH and H, and R 4 is OH.

Claim 22

The ink of claim 18 wherein said bile salt is selected from the group consisting of ______________________________________ Name R.sub.1 R.sub.2 R.sub.3 R.sub.4 ______________________________________ cholate O.sup.- OH OH OH deoxycholate O.sup.- OH H OH chenodeoxycholate O.sup.- H OH OH glycholate NH--CH.sub.2 --COO.sup.- OH OH OH taurocholate NH--(CH.sub.2).sub.2 --SO.sub.3.sup.- OH OH OH. ______________________________________

Claim 23

The ink of claim 19 wherein each molecule of said bile salt has a cation associated therewith selected from the group consisting of lithium, potassium, cesium, sodium, magnesium, manganese, ammonium, and quaternary ammonium salts.

Claim 24

The ink of claim 20 wherein said bile salt consists essentially of sodium cholate.

Claim 25

The ink of claim 17 wherein the concentration of said bile salt is about 0.5 wt% of said ink.

Claim 26

The ink of claim 17 comprising about 0.5 to 5 wt% of a water-soluble, anionic dye and a vehicle comprising about 1 to 15 wt% of a member selected from the group consisting of glycols and lactams and the balance water.

Claim 27

The ink of claim 23 wherein said glycol is selected from the group consisting of ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, propylene glycol, polyethylene glycol, polypropylene glycol, 1,5-pentanediol, and mixtures thereof.

Claim 28

The ink of claim 23 wherein said lactam is selected from the group consisting of 2-pyrrolidone, N-pyrrolidone, N-methyl pyrrolidone, N-hexyl pyrrolidone, N-(2-hydroxyethyl)pyrrolidone, caprolactam, and mixtures thereof.

Claim 29

The ink of claim 23 wherein said ink further comprises about 0.1 to 0.3 wt% of an alginate, about 0.5 to 5 wt% of a zwitterionic surfactant, and 0 to about 5 wt% of an acetylenic polyethylene oxide surfactant.

Claim 30

A thermal ink-jet ink comprising a vehicle and at least one dye and containing about 0.1 to 3 wt% of sodium cholate.

Claim 31

A thermal ink-jet ink comprising a vehicle and at least one dye and containing about 0.1 to 3 wt% of sodium cholate.

Claim 32

The ink of claim 27 wherein the concentration of said sodium cholate is about 0.5 wt%.

Claim 33

The ink of claim 27 comprising about 0.5 to 5 wt% of a water-soluble, anionic dye and a vehicle comprising about 1 to 15 wt% of a member selected from the group consisting of glycols and lactams and the balance water.

Claim 34

The ink of claim 29 wherein said glycol is selected from the group consisting of diethylene glycol and 1,5-pentanediol, and wherein said lactam is 2-pyrrolidone.

Claim 35

The ink of claim wherein said ink further comprises about 0.1 to 0.3 wt% of sodium alginate, about 0.5 to 5 wt% of N,N-dimethyl-N-(Z-9-octadecenyl)-N-amine oxide, and 0 to about 5 wt% of an acetylenic polyethylene oxide surfactant.

Claim 36

The ink of claim 23 wherein said quaternary ammonium salts are selected from the group consisting of tetramethylammonium and tetrabutylammonium salts.