Patent US3900435A successfully refreshed from Google Patents.
US3900435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverulent acrylic resin binder mixtures containing triglycidyl isocyanurate and cellulose acetobutyrate
Assignee: Bayer AG
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Filing: 1974-04-02
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Granted: 1975-08-19
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Expires: 1994-04-02
Abstract
Abstract Copolymers of 23 to 92% by weight of methyl methacrylate, 5-62% by weight of an acrylic acid ester containing from 1 to 12 carbon atoms in the ester portion or a methacrylic acid ester containing from 2 to 12 carbon atoms in the ester portion and 3 to 15% by weight of unsaturated copolymerizable carboxylic acids are homogeneously mixed with triglycidyl isocyanurate, cellulose acetobutyrates and optionally with pigments and levelling agents. The mixture may be applied by electrostatic powder-spraying or other powder coating processes to suitable surfaces and cured at temperatures of about 130* to 220*C. The backed films of the mixture show outstanding adherence to the substrate and hardness coupled with elasticity, high gloss and weather resistance.
Inventors
- 👤 Frank Wingler
- 👤 Richard Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:52
CPC Classifications
C; C09; C09D; C09D133/00; C09D133/04; C09D133/06; C09D133/062; C09D133/064; C08; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/14; C08L63/00; C08L63/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A POWDERED COATING AGENT COMPRISING A MIXTURE OF A. A COPOLYMER OF I. 23 TO 92% BY WEIGHT OF METHYL METHACRYLATE, II. 5 TO 62% BY WEIGHT OF AN ACRYLIC ACID ESTER HAVING FROM 1 TO 12 CARBON ATOMS IN THE ESTER PORTION OR A METHACRYLIC ACID ESTER HAVING FROM 2 TO 12 CARBON ATOMS IN THE ESTER PORTION OR A MIXTURE THEREOF AND III. 3 TO 15% BY WEIGHT OF ACRYLIC ACID, METHACRYLIC ACID, ITACONIC ACID, MALEIC ACID OR FUMARIC ACID OR A MIXTURE THEREOF, WHEREIN THE SUM OF THE PERCENTAGES CONTENTS OF I TO III IS 100 AND THE AVERAGE MOLECULAR WEIGHT IS FROM ABOUT 3,000 TO 20,000, B. TRIGLYCIDYL ISOCYANURATE AND C. CELLULOSE ACETOBUTYRATE WHEREIN THERE ARE 95 TO 80 PARTS BY WEIGHT OF SAID COPOLYMER (A) TO 5 TO 20 PARTS BY WEIGHT OF TRIGLYCIDYL ISOCYANURATE (B) AND 50 TO 40% BY WEIGHT, BASED ON (A), OF CELLULOSE ACETOBUTYRATE (C).
Claim 2
Dependent Claim
154 words
A POWDERED COATING AGENT COMPRISING A MIXTURE OF A. A COPOLYMER OF I. 23 TO 92% BY WEIGHT OF METHYL METHACRYLATE, II. 5 TO 62% BY WEIGHT OF AN ACRYLIC ACID ESTER HAVING FROM 1 TO 12 CARBON ATOMS IN THE ESTER PORTION OR A METHACRYLIC ACID ESTER HAVING FROM 2 TO 12 CARBON ATOMS IN THE ESTER PORTION OR A MIXTURE THEREOF AND III. 3 TO 15% BY WEIGHT OF ACRYLIC ACID, METHACRYLIC ACID, ITACONIC ACID, MALEIC ACID OR FUMARIC ACID OR A MIXTURE THEREOF, WHEREIN THE SUM OF THE PERCENTAGES CONTENTS OF I TO III IS 100 AND THE AVERAGE MOLECULAR WEIGHT IS FROM ABOUT 3,000 TO 20,000, B. TRIGLYCIDYL ISOCYANURATE AND C. CELLULOSE ACETOBUTYRATE WHEREIN THERE ARE 95 TO 80 PARTS BY WEIGHT OF SAID COPOLYMER (A) TO 5 TO 20 PARTS BY WEIGHT OF TRIGLYCIDYL ISOCYANURATE (B) AND 50 TO 40% BY WEIGHT, BASED ON (A), OF CELLULOSE ACETOBUTYRATE (C).
Claim 3
Dependent Claim
24 words
The powdered coating agent of claim 1 containing up to 150% by weight, based on the weight of (A) and (B), of a pigment.
Claim 4
Dependent Claim
46 words
The powdered coating agent of claim 1 containing From 0.1 to 40% by weight, based on the weight of (A), of at least one levelling agent selected from the group consisting of silicones, polyesters, oligomeric acrylates, phosphoric acid esters, phthalic acid esters and adipic acid esters.
Claim 5
Dependent Claim
46 words
The powdered coating agent of claim 1 wherein said cellulose acetobutyrate has an acetate group content of from 5 to 40% by weight, a butyrate content, calculated as butyric acid, of from 10 to 58% by weight and a melting range of from 120* to 200*C.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |