US3248356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multisperse acrylic latexes
Assignee: Dow Chemical Co
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Filing: 1963-09-26
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Granted: 1966-04-26
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Expires: 1983-09-26
Abstract
No abstract record available.
Inventors
- 👤 Walter C Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:35
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/12; C08F2/00; C08F2/12; C08F2/16; C08F2/22; C08F2/24; C08F2/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
229 words
AN EMULSION POLYMERIZATION PROCESS FOR PREPARING AN AQUEOUS, HOMOGENEOUS, COLLOIDAL DISPERSION OF ACRYLIC, RESINOUS, POLYMERIC LATEX HAVING FROM ABOUT 25 TO ABOUT 60 PERCENT BY WEIGHT OF NON-VOLATILE SOLIDS, SAID LATEX BEING COMPOSED OF FROM ABOUT 90 TO ABOUT 97 PERCENT BY VOLUME OF DISCRETE RESINOUS PARTICLES HAVING AN AVERAGE DIAMETER OF FROM 0.4 TO 1.0 MICRON AND FROM ABOUT 3 TO ABOUT 10 PERCENT BY VOLUME OF DISCRETE RESINOUS PARTICLES HAVING AN AVERAGE DIAMETER OF FROM 0.05 TO 0.1 MICRON, SAID PROCESS COMPRISING THE SEQUENTIAL STEPS OF: (1) HEATING WATER CONTAINING A WATER-SOLUBLE POLYMERIZATION CATALYST IN AN INERT ATMOSPHERE TO A TEMPERATURE OF UP TO ABOUT 85*C.; (2) CONTINUOUSLY ADDING ABOUT 1/3 OF THE MONOMER MIXUTER; (3) CONTINUING REACTION WITHOUT INTERRUPTION UNDER ESTABLISHED REACTION CONDITIONS FOR A PERIOD OF AT LEAST 15 MINUTES; (4) ADDING TO SAID REACTION MEDIA A WATER SOLUTION OF A WATER-SOLUBLE, ANIONIC EMULSIFIER AND AN AQUEOUS CATALYST SOLUTION; (5) ADDING THE REMAINING PORTION OF MONOMER MIXTURE STEADILY OVER A PERIOD OF AT LEAST 45 MINUTES; (6) ALLOWING THE REACTION TO PROCEED WITHOUT INTERRUPTION FOR ABOUT ONE HOUR WHILE MAINTIANING THE REACTION TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 80*C. TO ABOUT 90*C; AND (7) ADJUSTING THE ALKALINITY OF THE REACTION MEDIA TO A PH WITHIN THE RANGE OF FROM 8 TO 8.5 WITH A WATER-SOLUBLE ALKALINE COMPOUND PRIOR TO COOLING OF THE LATEX PRODUCT.
Claim 2
Dependent Claim
229 words
AN EMULSION POLYMERIZATION PROCESS FOR PREPARING AN AQUEOUS, HOMOGENEOUS, COLLOIDAL DISPERSION OF ACRYLIC, RESINOUS, POLYMERIC LATEX HAVING FROM ABOUT 25 TO ABOUT 60 PERCENT BY WEIGHT OF NON-VOLATILE SOLIDS, SAID LATEX BEING COMPOSED OF FROM ABOUT 90 TO ABOUT 97 PERCENT BY VOLUME OF DISCRETE RESINOUS PARTICLES HAVING AN AVERAGE DIAMETER OF FROM 0.4 TO 1.0 MICRON AND FROM ABOUT 3 TO ABOUT 10 PERCENT BY VOLUME OF DISCRETE RESINOUS PARTICLES HAVING AN AVERAGE DIAMETER OF FROM 0.05 TO 0.1 MICRON, SAID PROCESS COMPRISING THE SEQUENTIAL STEPS OF: (1) HEATING WATER CONTAINING A WATER-SOLUBLE POLYMERIZATION CATALYST IN AN INERT ATMOSPHERE TO A TEMPERATURE OF UP TO ABOUT 85*C.; (2) CONTINUOUSLY ADDING ABOUT 1/3 OF THE MONOMER MIXUTER; (3) CONTINUING REACTION WITHOUT INTERRUPTION UNDER ESTABLISHED REACTION CONDITIONS FOR A PERIOD OF AT LEAST 15 MINUTES; (4) ADDING TO SAID REACTION MEDIA A WATER SOLUTION OF A WATER-SOLUBLE, ANIONIC EMULSIFIER AND AN AQUEOUS CATALYST SOLUTION; (5) ADDING THE REMAINING PORTION OF MONOMER MIXTURE STEADILY OVER A PERIOD OF AT LEAST 45 MINUTES; (6) ALLOWING THE REACTION TO PROCEED WITHOUT INTERRUPTION FOR ABOUT ONE HOUR WHILE MAINTIANING THE REACTION TEMPERATURE WITHIN THE RANGE OF FROM ABOUT 80*C. TO ABOUT 90*C; AND (7) ADJUSTING THE ALKALINITY OF THE REACTION MEDIA TO A PH WITHIN THE RANGE OF FROM 8 TO 8.5 WITH A WATER-SOLUBLE ALKALINE COMPOUND PRIOR TO COOLING OF THE LATEX PRODUCT.
Claim 3
Dependent Claim
127 words
AN AQUEOUS, COLLOIDAL DISPERSION OF A MULTISPERSE, PARTICULATE, ACRYLIC, RESINOUS, POLYMERIC LATEX, SAID MULTISPERSE, PARTICULATE LATEX BEING COMPRISED, IN PERCENT BY VOLUME, OF FROM ABOUT 90 TO ABOUT 97 PERCENT OF LARGE POLYMERIC LATEX PARTICLES HAVING AN AVERAGE DIAMETER OF FROM ABOUT 0.4 TO 1.0 MICRON AND FROM ABOUT 3 TO ABOUT 10 PERCENT OF SMALL POLYMERIC LATEX PARTICLES HAVING AN AVERAGE DIAMETER OF FROM ABOUT 0.05 TO 0.1 MICRON, SAID MULTISPERSE, PARTICULATE LATEX PARTICLES BEING COMPOSED OF FROM ABOUT 45 TO ABOUT 55 WEIGHT PERCENT OF NON-VOLATILE SOLIDS OF THE COPOLYMERIZATION PRODUCT, IN PERCENT BY WEIGHT, OF (A) ABOUT 52.5 PERCENT OF ETHYL ACRYLATE, (B) ABOUT 38.7 PERCENT OF METHYL METHACRYLATE, (C) ABOUT 5.9 PERCENT OF BUTYL ACRYLATE, AND (D) ABOUT 2.9 PERCENT OF METHACRYLIC ACID.
Claim 4
Dependent Claim
127 words
AN AQUEOUS, COLLOIDAL DISPERSION OF A MULTISPERSE, PARTICULATE, ACRYLIC, RESINOUS, POLYMERIC LATEX, SAID MULTISPERSE, PARTICULATE LATEX BEING COMPRISED, IN PERCENT BY VOLUME, OF FROM ABOUT 90 TO ABOUT 97 PERCENT OF LARGE POLYMERIC LATEX PARTICLES HAVING AN AVERAGE DIAMETER OF FROM ABOUT 0.4 TO 1.0 MICRON AND FROM ABOUT 3 TO ABOUT 10 PERCENT OF SMALL POLYMERIC LATEX PARTICLES HAVING AN AVERAGE DIAMETER OF FROM ABOUT 0.05 TO 0.1 MICRON, SAID MULTISPERSE, PARTICULATE LATEX PARTICLES BEING COMPOSED OF FROM ABOUT 45 TO ABOUT 55 WEIGHT PERCENT OF NON-VOLATILE SOLIDS OF THE COPOLYMERIZATION PRODUCT, IN PERCENT BY WEIGHT, OF (A) ABOUT 52.5 PERCENT OF ETHYL ACRYLATE, (B) ABOUT 38.7 PERCENT OF METHYL METHACRYLATE, (C) ABOUT 5.9 PERCENT OF BUTYL ACRYLATE, AND (D) ABOUT 2.9 PERCENT OF METHACRYLIC ACID.
References Cited (Backward Citations)
US2954358A
Cited
US3057812A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-25 | 1969-10-25 | 1970-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-25 | 1973-10-25 | 1974-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-25 | 1977-10-25 | 1978-04-26 | $7700.00 | Window Closed / Lapsed |