US4328284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating of paper
Assignee: BASF SE
•
Filing: 1980-03-04
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Granted: 1982-05-04
•
Expires: 2000-03-04
Abstract
Abstract The opacity and brightness of a sheet of paper coated with a composition comprised essentially of a pigment and a latex of a film-forming polymer are improved when the paper after being coated is dried under conditions adapted to prevent coalescence of the polymer particles of the latex during the drying step and then subjected to a treatment adapted to cause coalescence of the polymer particles, without subjecting the coating to compressive forces during this treatment step.
Inventors
- 👤 Pierre F. LePoutre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:37
CPC Classifications
D; D21; D21H; D21H25/00; D21H25/04; D21H25/06; B; B41; B41M; B41M5/00; B41M5/50; B41M5/52; B41M5/5254; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/3188; Y10T428/31895
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
96 words
A process comprising applying a layer of a coating consisting essentially of a minor amount of a latex of a film forming polymer and a major amount of a pigment to a substrate, drying the coating at a temperature below the minimum film forming temperature of the polymer in the latex and under conditions adapted to prevent the coalescence of the polymer particles in the latex and subsequently heating the dried coating at a temperature at least as high as the minimum film forming temperature of the polymer without subjecting the dried coating to compressive force.
Claim 2
Dependent Claim
96 words
A process comprising applying a layer of a coating consisting essentially of a minor amount of a latex of a film forming polymer and a major amount of a pigment to a substrate, drying the coating at a temperature below the minimum film forming temperature of the polymer in the latex and under conditions adapted to prevent the coalescence of the polymer particles in the latex and subsequently heating the dried coating at a temperature at least as high as the minimum film forming temperature of the polymer without subjecting the dried coating to compressive force.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein the film-forming polymer contains a functional group in its molecular structure.
Claim 4
Dependent Claim
45 words
A process according to claim 2 wherein the film-forming polymer is comprised of the copolymerization product of 0-60 weight % of a C 4 -C 6 conjugated diolefin, 99.9-40% of a styrene and 0.1-5% of an unsaturated C 3 -C 6 mono- or dicarboxylic acid.
Claim 5
Dependent Claim
46 words
A process according to claim 1 wherein the polymer particles in the latex are comprised in major proportion of a rubbery polymer having a lower minimum film-forming temperature and in minor proportion of a resinous polymer having a higher minimum film-forming temperature than the rubbery polymer.
Claim 6
Dependent Claim
33 words
A process according to claim 1 wherein a small proportion of a latex of a film-forming polymer having a minimum film-forming temperature lower than the drying temperature is also included in the coating.
Claim 7
Dependent Claim
15 words
A process according to claim 1 wherein the pigment is comprised of a delaminated clay.
Claim 8
Dependent Claim
12 words
A process according to claim 1 wherein the supporting substrate is paper.
Claim 9
Dependent Claim
10 words
A product made according to the process of claim 1.
Claim 10
Dependent Claim
10 words
A product made according to the process of claim 3.
Claim 11
Dependent Claim
10 words
A product made according to the process of claim 4.
Claim 12
Dependent Claim
10 words
A product made according to the process of claim 6.
Claim 13
Dependent Claim
10 words
A product made according to the process of claim 7.
References Cited (Backward Citations)
GB680998A
Cited
GB673972A
Cited
GB1161402A
Cited
US3399080A
Cited
GB1298523A
Cited
US3873345A
Cited
US4112192A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |