US3988522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paper coated with organic pigment-containing coating colors
Assignee: Cabot Corp
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Filing: 1975-11-24
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Granted: 1976-10-26
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Expires: 1995-11-24
Abstract
Abstract Improved aqueous slurry type coating colors for coating of paper, paperboard and the like are described in which there is incorporated along with the usual finely divided inorganic pigments, such as clay, an auxiliary pigment consisting of a substantially water-insoluble, cross-linked urea-formaldehyde resin in highly dispersed particulate form. The urea-formaldehyde pigment constitutes from about 2 to 25% and preferably from about 3 to about 15% by weight of the total pigment solids in the coating colors. The BET specific surface area of the particulate urea-formaldehyde pigments ranges from about 40 to about 75 square meters per gram in which instance the average agglomerate size of the pigments ranges from about 2 to about 3.5 microns. In those instances where the BET specific surface area of the urea-formaldehyde pigments ranges from at least 15 to 40 square meters per gram, the average agglomerate size of the pigments ranges from about 2 to about 4 microns.
Inventors
- 👤 Gregor Berstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:33
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J2361/00; C08J2361/20; C08J2361/22; C08J2361/24; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31964
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
143 words
Coated paper comprising a cellulose base paper layer coated on at least one side thereof with an adherent coating comprising a suitable polymeric binder dissolved or dispersed in an aqueous slurry of finely divided pigment solids, the principal proportion of which by weight are inorganic pigments of less than 2 microns in mean particle size, and which pigment solids, in an amount of from about 2 to about 25% by weight based upon the total weight of pigment solids employed in the coating color composition, are essentially water-insoluble, infusible, non-porous, cross-linked urea-formaldehyde pigments in a highly dispersed particulate form having a molar ratio of urea to formaldehyde ranging from about 1:1.3 to about 1:1.8, a BET specific surface area of from about 40 to about 75 square meters per gram, and a mean agglomerate size of from about 2 to about 3.5 microns.
Claim 2
Dependent Claim
143 words
Coated paper comprising a cellulose base paper layer coated on at least one side thereof with an adherent coating comprising a suitable polymeric binder dissolved or dispersed in an aqueous slurry of finely divided pigment solids, the principal proportion of which by weight are inorganic pigments of less than 2 microns in mean particle size, and which pigment solids, in an amount of from about 2 to about 25% by weight based upon the total weight of pigment solids employed in the coating color composition, are essentially water-insoluble, infusible, non-porous, cross-linked urea-formaldehyde pigments in a highly dispersed particulate form having a molar ratio of urea to formaldehyde ranging from about 1:1.3 to about 1:1.8, a BET specific surface area of from about 40 to about 75 square meters per gram, and a mean agglomerate size of from about 2 to about 3.5 microns.
Claim 3
Dependent Claim
24 words
Coated paper as defined in claim 1 wherein the adherent coating amounts to at least one pound finished weight per ream of base paper.
Claim 4
Dependent Claim
43 words
Coated paper as defined in claim 1 wherein the cellulose base paper has a basis weight of from about 18 to about 60 pounds per ream and the adherent coating amounts to at least two pounds finished weight per ream of base paper.
Claim 5
Dependent Claim
22 words
Coated paper as defined in claim 1 wherein a second coating of different composition is applied on top of the adherent coating.
Claim 6
Dependent Claim
19 words
Coated paper as defined in claim 4 wherein the second coating is substantially free of the cross-linked urea-formaldehyde pigment.
Claim 7
Dependent Claim
143 words
Coated paper comprising a cellulose base paper layer coated on at least one side thereof with an adherent coating comprising a suitable polymer binder dissolved or dispersed in an aqueous slurry of finely divided pigment solids, the principal proportion of which by weight are inorganic pigments of less than 2 microns in mean particle size, and which pigment solids, in an amount of from about 2 to about 25% by weight based upon the total weight of pigment solids employed in the coating color composition, are essentially water-insoluble, infusible, non-porous, cross-linked urea-formaldehyde pigments in a highly dispersed particulate form having a molar ratio of urea to formaldehyde ranging from about 1:1.3 to about 1:1.8, a BET specific surface area of from at least 15 to 40 square meters per gram, and a mean agglomerate size of from about 2 to about 4.0 microns.
Claim 8
Dependent Claim
143 words
Coated paper comprising a cellulose base paper layer coated on at least one side thereof with an adherent coating comprising a suitable polymer binder dissolved or dispersed in an aqueous slurry of finely divided pigment solids, the principal proportion of which by weight are inorganic pigments of less than 2 microns in mean particle size, and which pigment solids, in an amount of from about 2 to about 25% by weight based upon the total weight of pigment solids employed in the coating color composition, are essentially water-insoluble, infusible, non-porous, cross-linked urea-formaldehyde pigments in a highly dispersed particulate form having a molar ratio of urea to formaldehyde ranging from about 1:1.3 to about 1:1.8, a BET specific surface area of from at least 15 to 40 square meters per gram, and a mean agglomerate size of from about 2 to about 4.0 microns.
Claim 9
Dependent Claim
24 words
Coated paper as defined in claim 6 wherein the adherent coating amounts to at least one pound finished weight per ream of base paper.
Claim 10
Dependent Claim
43 words
Coated paper as defined in claim 6 wherein the cellulose base paper has a basis weight of from about 18 to about 60 pounds per ream and the adherent coating amounts to at least two pounds finished weight per ream of base paper.
Claim 11
Dependent Claim
22 words
Coated paper as defined in claim 6 wherein a second coating of different composition is applied on top of the adherent coating.
Claim 12
Dependent Claim
19 words
Coated paper as defined in claim 9 wherein the second coating is substantially free of the cross-linked urea-formaldehyde pigment.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |