US4548645A — Lithographic water based fountain solution concen…

Claim 1

Independent Claim 154 words

In a water dilutable concentrate for use in lithographic fountain solutions containing water, a buffer, a polyol and a surfactant the improvement comprising, as the buffer, at least on salt of (a) a polycarboxylic acid and (b) an organic amine, wherein the polycarboxylic acid has a pK a between about 3 and about 6, the organic amine has a pK b between about 2 and about 9, and the concentrate when mixed in an amount of about 1% to about 6% by weight with water yields a fountain solution having a pH between about 4.7 and about 5.3, a surface tension between about 32×10 -3 Newton/m and about 52×10 -3 Newton/m, and a sufficient buffer effect such that the pH variation of the fountain solution will be less than about one pH unit when 5 cc of decinormal NaOH or 5 cc of decinormal HCl is added to 100 cc of the fountain solution.

Claim 2

Dependent Claim 154 words

In a water dilutable concentrate for use in lithographic fountain solutions containing water, a buffer, a polyol and a surfactant the improvement comprising, as the buffer, at least on salt of (a) a polycarboxylic acid and (b) an organic amine, wherein the polycarboxylic acid has a pK a between about 3 and about 6, the organic amine has a pK b between about 2 and about 9, and the concentrate when mixed in an amount of about 1% to about 6% by weight with water yields a fountain solution having a pH between about 4.7 and about 5.3, a surface tension between about 32×10 -3 Newton/m and about 52×10 -3 Newton/m, and a sufficient buffer effect such that the pH variation of the fountain solution will be less than about one pH unit when 5 cc of decinormal NaOH or 5 cc of decinormal HCl is added to 100 cc of the fountain solution.

Claim 3

Dependent Claim 19 words

The concentrate of claim 1 which additionally contains 4 wt. %-10 wt. % of a low molecular weight alcohol.

Claim 4

Dependent Claim 21 words

The concentrate as recited in claim 1 wherein the polycarboxylic acid is citric acid and the organic amine is dimethyl amine.

Claim 5

Dependent Claim 17 words

The concentrate as recited in claim 2 additionally containing 0.5 wt. %-6.0 wt. % of a biocide.

Claim 6

Dependent Claim 29 words

The concentrate as recited in claim 3 additionally containing 0.5 wt. %-6.0 wt. % of a biocide selected from the group consisting of algicide, bactericide, and a combination thereof.

Claim 7

Dependent Claim 17 words

The concentrate as recited in claim 1 wherein the polycarboxylic acid contains at least one hydroxyl group.

Claim 8

Dependent Claim 26 words

The concentrate as recited in claim 2 wherein the low molecular weight alcohol is selected from the group consisting of ethanol, isopropanol, and a mixture thereof.

Claim 9

Dependent Claim 127 words

A water dilutable concentrate for use in lithographic fountain solutions containing 58.7 wt. % water 20.5 wt. % of a buffer salt comprising the salt of citric acid and dimethylamine. 7 wt. % polyvinylpyrrolidone 5.3 wt. % of ethanol 3.5 wt. % isopropanol 5.0 wt. % biocide wherein said concentrate, when mixed with water in an amount of about 1% to about 6% by weight, yields a fountain solution having a pH between about 4.7 and about 5.3, a surface tension between about 32×10 -3 Newton/m and about 52×10 -3 Newton/m, and a sufficient buffer effect such that the pH variation will be less than about one pH unit when 5 cc of decinormal NaOH or decinormal HCl is added to 100 cc of the fountain solution.

Claim 10

Dependent Claim 127 words

A water dilutable concentrate for use in lithographic fountain solutions containing 58.7 wt. % water 20.5 wt. % of a buffer salt comprising the salt of citric acid and dimethylamine. 7 wt. % polyvinylpyrrolidone 5.3 wt. % of ethanol 3.5 wt. % isopropanol 5.0 wt. % biocide wherein said concentrate, when mixed with water in an amount of about 1% to about 6% by weight, yields a fountain solution having a pH between about 4.7 and about 5.3, a surface tension between about 32×10 -3 Newton/m and about 52×10 -3 Newton/m, and a sufficient buffer effect such that the pH variation will be less than about one pH unit when 5 cc of decinormal NaOH or decinormal HCl is added to 100 cc of the fountain solution.

Claim 11

Dependent Claim 125 words

In a lithographic fountain solution containing water, a buffer, a polyol and a surfactant the improvement comprising, as the buffer, at least one salt of (a) a polycarboxylic acid and (b) an organic amine, wherein the polycarboxylic acid has a pK b between about 3 and about 6, the organic amine has a pK b between about 2 and about 9, and the fountain solution has a pH of between about 4.7 and about 5.3, a surface tension between about 32×10 -3 Newton/m and about 52×10 -3 Newton/m, and a sufficient buffer effect such that the pH variation will be less than about one pH unit when 5 cc of the decinormal NaOH or decinormal HCl is added to 100 cc of the fountain solution.

Claim 12

Dependent Claim 125 words

In a lithographic fountain solution containing water, a buffer, a polyol and a surfactant the improvement comprising, as the buffer, at least one salt of (a) a polycarboxylic acid and (b) an organic amine, wherein the polycarboxylic acid has a pK b between about 3 and about 6, the organic amine has a pK b between about 2 and about 9, and the fountain solution has a pH of between about 4.7 and about 5.3, a surface tension between about 32×10 -3 Newton/m and about 52×10 -3 Newton/m, and a sufficient buffer effect such that the pH variation will be less than about one pH unit when 5 cc of the decinormal NaOH or decinormal HCl is added to 100 cc of the fountain solution.

Claim 13

Dependent Claim 19 words

The fountain solution of claim 9 additionally containing 4 wt. %-10 wt. % of a low molecular weight alcohol.

Claim 14

Dependent Claim 20 words

The fountain solution of claim 9 wherein the polycarboxylic acid is citric acid and the organic base is dimethyl amine.

Claim 15

Dependent Claim 16 words

The fountain solution of claim 9 additionally containing 0.5 wt. %-6.0 wt. % of a biocide.

Claim 16

Dependent Claim 28 words

The fountain solution of claim 9 additionally containing 0.5 wt. %-6.0 wt. % of a biocide selected from the group consisting of algicide, bactericide or a combination thereof.

Claim 17

Dependent Claim 16 words

The fountain solution of claim 9 wherein the polycarboxylic acid contains at least one hydroxyl group.

Claim 18

Dependent Claim 25 words

The fountain solution of claim 10 wherein the low molecular weight alcohol is selected from the group consisting of ethanol, isopropanol and a combination thereof.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-10-21	1989-04-22	1989-10-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-10-21	1993-04-22	1993-10-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-10-21	1997-04-22	1997-10-22	$7700.00	Window Closed / Lapsed

Lithographic water based fountain solution concentrates

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