US5762698A
Expired / Lapsed
US
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Method for dispersing optical brighteners in waterborne coating compositions
Assignee: Individual
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Filing: 1997-02-24
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Granted: 1998-06-09
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Expires: 2017-02-24
Abstract
Abstract This invention provides a method for rendering a water-based coating (i.e., one which contains essentially no organic solvent) fluorescent. Also provided is a method for measuring the extent of coverage and thickness of a water-based coating by incorporating therein a minor amount of an emulsion of an insoluble compound which absorbs ultraviolet light and fluoresces strongly in the visible region of the spectrum, so that the intensity of the fluorescence serves as an indication of the degree of coverage and thickness of the film. Also provided is a method for enhancing the apparent brightness of a film pigmented with light colored pigments. In the case where white pigments such as titanium dioxide are used, the effect is to increase the apparent whiteness of the film.
Inventors
- 👤 Douglas G. Atkins
- 👤 Theron E. Parsons, III
- 👤 William C. Gose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:54
CPC Classifications
C; C09; C09D; C09D123/00; C09D123/26; C09D123/30; C08; C08K; C08K5/00; C08K5/0008; C08K5/0041; C08K5/16; C08K5/34; C08K5/35; C08K5/353; C09D123/28
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
94 words
An aqueous emulsion comprising (a) a low molecular weight emulsifiable polyolefin wax in the amount of 3.0 to 8.0 weight percent based on the weight of the aqueous emulsion; (b) a non-ionic surfactant in the amount of 2.0 to 4.0 weight percent based on the weight of the aqueous emulsion; (c) water in the amount of 37.0 to 69.6 weight percent based on the weight of the aqueous emulsion; and (d) an essentially water-insoluble optical brightener compound in the amount of 25.0 to 50.0 weight percent based on the weight of the aqueous emulsion.
Claim 2
Dependent Claim
94 words
An aqueous emulsion comprising (a) a low molecular weight emulsifiable polyolefin wax in the amount of 3.0 to 8.0 weight percent based on the weight of the aqueous emulsion; (b) a non-ionic surfactant in the amount of 2.0 to 4.0 weight percent based on the weight of the aqueous emulsion; (c) water in the amount of 37.0 to 69.6 weight percent based on the weight of the aqueous emulsion; and (d) an essentially water-insoluble optical brightener compound in the amount of 25.0 to 50.0 weight percent based on the weight of the aqueous emulsion.
Claim 3
Dependent Claim
47 words
The emulsion of claim 1, wherein the low molecular weight emulsifiable polyolefin wax is a wax having a density in the range of about 0.92-0.96, melt viscosities in the range of about 50-4000 cp at 125° C., and an acid number in the range of about 12-55.
Claim 4
Dependent Claim
38 words
The emulsion of claim 1, wherein the optical brightener compound is a compound having the formula ##STR2## wherein R 1 and R 2 are independently hydrogen; halogen; C 1 -C 4 alkyl; or C 1 -C 6 alkoxycarbonyl.
Claim 5
Dependent Claim
13 words
The emulsion of claim 3, wherein R 1 and R 2 are hydrogen.
Claim 6
Dependent Claim
13 words
The emulsion of claim 3, wherein R 1 and R 2 are methyl.
Claim 7
Independent Claim
123 words
A method for determining the thickness and coverage of a waterborne coating composition, which comprises applying a waterborne coating composition having therein, at least about 0.01 weight percent of an aqueous emulsion comprising (a) a low molecular weight emulsifiable polyolefin wax in the amount of 3.0 to 8.0 weight percent based on the weight of the aqueous emulsion; (b) a non-ionic surfactant in the amount of 2.0 to 4.0 weight percent based on the weight of the aqueous emulsion; (c) water in the amount of 37.0 to 69.6 weight percent based on the weight of the aqueous emulsion; and (d) an essentially water-insoluble optical brightener compound in the amount of 25.0 to 50.0 weight percent based on the weight of the aqueous emulsion.
Claim 8
Independent Claim
123 words
A method for determining the thickness and coverage of a waterborne coating composition, which comprises applying a waterborne coating composition having therein, at least about 0.01 weight percent of an aqueous emulsion comprising (a) a low molecular weight emulsifiable polyolefin wax in the amount of 3.0 to 8.0 weight percent based on the weight of the aqueous emulsion; (b) a non-ionic surfactant in the amount of 2.0 to 4.0 weight percent based on the weight of the aqueous emulsion; (c) water in the amount of 37.0 to 69.6 weight percent based on the weight of the aqueous emulsion; and (d) an essentially water-insoluble optical brightener compound in the amount of 25.0 to 50.0 weight percent based on the weight of the aqueous emulsion.
Claim 9
Dependent Claim
47 words
The method of claim 6, wherein the low molecular weight emulsifiable polyolefin wax is a wax having a density in the range of about 0.92-0.96, melt viscosities in the range of about 50-4000 cp at 125° C., and an acid number in the range of about 12-55.
Claim 10
Dependent Claim
38 words
The method of claim 6, wherein the optical brightener compound is a compound having the formula ##STR3## wherein R 1 and R 2 are independently hydrogen; halogen; C 1 -C 4 alkyl; or C 1 -C 6 alkoxycarbonyl.
Claim 11
Dependent Claim
13 words
The method of claim 6, wherein R 1 and R 2 are hydrogen.
Claim 12
Independent Claim
113 words
A method for improving the apparent brightness of a lightly-pigmented waterborne coating composition, which comprises incorporating in said composition, an aqueous emulsion comprising (a) a low molecular weight emulsifiable polyolefin wax in the amount of 3.0 to 8.0 weight percent based on the weight of the aqueous emulsion; (b) a non-ionic surfactant in the amount of 2.0 to 4.0 weight percent based on the weight of the aqueous emulsion; (c) water in the amount of 37.0 to 69.6 weight percent based on the weight of the aqueous emulsion; and (d) an essentially water-insoluble optical brightener compound in the amount of 25.0 to 50.0 weight percent based on the weight of the aqueous emulsion.
Claim 13
Independent Claim
113 words
A method for improving the apparent brightness of a lightly-pigmented waterborne coating composition, which comprises incorporating in said composition, an aqueous emulsion comprising (a) a low molecular weight emulsifiable polyolefin wax in the amount of 3.0 to 8.0 weight percent based on the weight of the aqueous emulsion; (b) a non-ionic surfactant in the amount of 2.0 to 4.0 weight percent based on the weight of the aqueous emulsion; (c) water in the amount of 37.0 to 69.6 weight percent based on the weight of the aqueous emulsion; and (d) an essentially water-insoluble optical brightener compound in the amount of 25.0 to 50.0 weight percent based on the weight of the aqueous emulsion.
Claim 14
Dependent Claim
47 words
The method of claim 10, wherein the low molecular weight emulsifiable polyolefin wax is a wax having a density in the range of about 0.92-0.96, melt viscosities in the range of about 50-4000 cp at 125° C., and an acid number in the range of about 12-55.
Claim 15
Dependent Claim
38 words
The method of claim 10, wherein the optical brightener compound is a compound having the formula ##STR4## wherein R 1 and R 2 are independently hydrogen; halogen; C 1 -C 4 alkyl; or C 1 -C 6 alkoxycarbonyl.
Claim 16
Dependent Claim
13 words
The method of claim 12, wherein R 1 and R 2 are hydrogen.
Claim 17
Dependent Claim
13 words
The method of claim 12, wherein R 1 and R 2 are methyl.
References Cited (Backward Citations)
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