Patent US4166882A successfully refreshed from Google Patents.
US4166882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of coating with aqueous thermosetting acrylic polymer latex of uniform particle size
Assignee: PPG Industries Inc
•
Filing: 1978-04-26
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Granted: 1979-09-04
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Expires: 1998-04-26
Abstract
Abstract An improved method of coating a solid substrate which is cured at a high temperature for a short period of time with a thermosetting aqueous acrylic polymer is disclosed. The improvement of the invention resides in: (i) the stability of the aqueous dispersion and (ii) the particle size of the dispersed particles which are large and uniform. The invention is particularly useful in coil coating applications where it eliminates the problem of solvent popping.
Inventors
- 👤 Suryya K. Das
- 👤 Charles M. Kania
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:27
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/14; B05D7/16; B05D2401/00; B05D2401/20; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678; Y10T428/31692; Y10T428/31699
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
In a method of coating a solid substrate which is cured under conditions such that the substrate reaches a temperature of at least 190° C. within 60 seconds with a thermosetting aqueous acrylic polymer latex, the improvement comprising coating said substrate with a stable acrylic polymer latex having an average particle size within the range of 2000 to 3000 Angstrom units and the particle size deviation is ± 300 Angstrom units.
Claim 2
Dependent Claim
71 words
In a method of coating a solid substrate which is cured under conditions such that the substrate reaches a temperature of at least 190° C. within 60 seconds with a thermosetting aqueous acrylic polymer latex, the improvement comprising coating said substrate with a stable acrylic polymer latex having an average particle size within the range of 2000 to 3000 Angstrom units and the particle size deviation is ± 300 Angstrom units.
Claim 3
Dependent Claim
84 words
The method of claim 1 in which the acrylic polymer is prepared from polymerizing the following mixture of monomers: ______________________________________
Monomer Percent by Weight
______________________________________
alkyl acrylate or methacrylate
containing from 1 to 18 carbon
atoms in the alkyl group
30-90
alpha, beta-ethylenically unsaturated
carboxylic acid 0.1-10
N-methylol ether derivatives of
acrylic and methacrylic amides
0-20
vinyl monomers containing active
hydrogens selected from the class
consisting of hydroxyl, amido, primary
amine, secondary amine and thiol
0-15
vinyl monomer different from those above
0-60
______________________________________
Claim 4
Dependent Claim
25 words
A length of coil metal which has been coated by the method of claim 1 and in which the coating is free of solvent popping.
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) | 1982-09-03 | 1983-03-05 | 1983-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-03 | 1987-03-05 | 1987-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-03 | 1991-03-05 | 1991-09-04 | $7700.00 | Window Closed / Lapsed |