US3879357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulverizable acrylic resins
Assignee: Bayer AG
•
Filing: 1974-01-28
•
Granted: 1975-04-22
•
Expires: 1994-01-28
Abstract
Abstract Copolymer having an average molecular weight of 500 to 10,000, a glass transition temperature of 40* to 70*C and an acid number of 55 to 120 mg of KOH/g of copolymer, said copolymer being the product of free radical copolymerization of a monomer mixture of I. 0 to 55 mol % of styrene, Alpha -methylstyrene, methylmethacrylate or mixtures thereof; II. 10 to 25 mol % of acrylic acid, methacrylic acid or mixtures thereof; III. 0 to 70 mol % of at least one ester of methacrylic acid containing 2 to 18 carbon atoms in the alcohol component and IV. 20 to 50 mol % of at least one ester of acrylic acid containing 1 to 18 carbon atoms in the alcohol component, AND PROCESS OF PRODUCING SAID COPOLYMER BY CONTINUOUSLY POLYMERIZING SAID MONOMER MIXTURE IN A CONTINUOUSLY FED PROCESS UNDER STEADY STATE AND PERFECTLY AGITATED CONDITIONS TO A CONVERSION OF 35 TO 60 MOL % AND THEN POLYMERIZING RESULTING POLYMERIZATION REACTION MIXTURE TO A CONVERSION OF AT LEAST 94 MOL % UNDER NON-STEADY STATE CONDITIONS WHICH PREVENT BACK MIXING OF THE POLYMER PRODUCED IN SAID SECOND POLYMERIZATION STEP WITH POLYMERIZATION REACTION MIXTURE FROM SAID FIRST POLYMERIZATION REACTION STEP IN A TUBULAR PLUG FLOW REACTOR UNDER NON-STEADY STATE CONDITIONS.
Inventors
- 👤 Frank Wingler
- 👤 Richard Muller
- 👤 Gerd Wassmuth
- 👤 Rudolf Erdmenger
- 👤 Martin Ullrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:34
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F212/00; C08F212/02; C08F212/04; C08F212/06; Y; Y10; Y10S; Y10S526/00; Y10S526/934
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
305 words
A PROCESS FOR PRODUCING PULVERIZABLE ACRYLIC RESINS WHICH HAVE AN AVERAGE MOLECULAR WEIGHT OF 500 TO 10,000, A GLASS TRANSITION TEMPERATURE OF 40* TO 70*C AND AN ACID NUMBER OF 55 TO 120 MG OF KOH/G OF RESIN, SAID PROCESS COMPRISING PREPARING A SOLVENT-FREE MONOMER MIXTURE OF I. 0 TO 55 MOL % OF STYRENE, A-METHYLSTYRENE, METHYL METHACRYLATE OR MIXTURES THEREOF, II. 10 TO 25 MOL % OF ACRYLIC ACID, METHACRYLIC ACID OR MIXTURES THEREOF, III. 0 TO 70 MOL % OF AT LEAST ONE ESTER OF METHACRYLIC ACID CONTAINING 2 TO 18 CARBON ATOMS IN THE ALCOHOL COMPONENT AND IV. 20 TO 50 MOL % OF AT LEAST ONE ESTER OF ACRYLIC ACID CONTAINING 1 TO 18 CARBON ATOMS IN THE ALCOHOL COMPONENT, CONTINUOUSLY FEEDING SAID MIXTURE INTO A FIRST POLYMERIZATION ZONE, CONRINUOUSLY POLYMERIZING SAID MIXTURE IN SAID FIRST ZONE UNDER STEADY STATE AND PERFECTLY AGITATED CONDITIONS AT TEMPERATURES FROM 100* TO 150*C. IN THE PRESENCE OF 0.1 TO 1 PERCENT BY WEIGHT OF AN ORGANIC INITIATOR WHICH DECOMPOSES INTO FREE RADICALS AT A TEMPERATURE BELOW 100*C. TO A CONVERSION OF 35 TO 60 MOL %, CONTINUOUSLY WITHDRAWING POLYMERIZATION REACTION MIXTURE FROM SAID FIRST ZONE AND THEN POLYMERIZING WITHDRAWN REACTION MIXTURE IN A SECOND POLYMERIZATION ZONE (TUBULAR PLUG FLOW REACTOR) AT TEMPERATURES FROM 130* TO 170*C. IN THE PRESENCE OF 0.1 TO 1 PERCENT BY WEIGHT OF AN ORGANIC INITIATOR WHICH DECOMPOSES INTO FREE RADICALS AT A TEMPERATURE ABOVE 100*C., SAID POLYMERIAZTION IN SAID SECOND ZONE (TUBULAR PLUG FLOW REACTOR) BEING CARRIED OUT TO A CONVERSION OF AT LEAST 94 MOL % AND UNDER NON-STEADY STATE CONDITIONS WHICH PREVENT BACK MIXING OF THE POLYMER PRODUCED IN SAID SECOND POLYMERIZATION ZONE WITH POLYMERIZATION REACTION MIXTURE FROM SAID FIRST POLYMERIZATION ZONE AND EACH SAID PERCENT BY WEIGHT BEING BASED ON THE WEIGHT OF THE MONOMER MIXTURE.
Claim 2
Dependent Claim
305 words
A PROCESS FOR PRODUCING PULVERIZABLE ACRYLIC RESINS WHICH HAVE AN AVERAGE MOLECULAR WEIGHT OF 500 TO 10,000, A GLASS TRANSITION TEMPERATURE OF 40* TO 70*C AND AN ACID NUMBER OF 55 TO 120 MG OF KOH/G OF RESIN, SAID PROCESS COMPRISING PREPARING A SOLVENT-FREE MONOMER MIXTURE OF I. 0 TO 55 MOL % OF STYRENE, A-METHYLSTYRENE, METHYL METHACRYLATE OR MIXTURES THEREOF, II. 10 TO 25 MOL % OF ACRYLIC ACID, METHACRYLIC ACID OR MIXTURES THEREOF, III. 0 TO 70 MOL % OF AT LEAST ONE ESTER OF METHACRYLIC ACID CONTAINING 2 TO 18 CARBON ATOMS IN THE ALCOHOL COMPONENT AND IV. 20 TO 50 MOL % OF AT LEAST ONE ESTER OF ACRYLIC ACID CONTAINING 1 TO 18 CARBON ATOMS IN THE ALCOHOL COMPONENT, CONTINUOUSLY FEEDING SAID MIXTURE INTO A FIRST POLYMERIZATION ZONE, CONRINUOUSLY POLYMERIZING SAID MIXTURE IN SAID FIRST ZONE UNDER STEADY STATE AND PERFECTLY AGITATED CONDITIONS AT TEMPERATURES FROM 100* TO 150*C. IN THE PRESENCE OF 0.1 TO 1 PERCENT BY WEIGHT OF AN ORGANIC INITIATOR WHICH DECOMPOSES INTO FREE RADICALS AT A TEMPERATURE BELOW 100*C. TO A CONVERSION OF 35 TO 60 MOL %, CONTINUOUSLY WITHDRAWING POLYMERIZATION REACTION MIXTURE FROM SAID FIRST ZONE AND THEN POLYMERIZING WITHDRAWN REACTION MIXTURE IN A SECOND POLYMERIZATION ZONE (TUBULAR PLUG FLOW REACTOR) AT TEMPERATURES FROM 130* TO 170*C. IN THE PRESENCE OF 0.1 TO 1 PERCENT BY WEIGHT OF AN ORGANIC INITIATOR WHICH DECOMPOSES INTO FREE RADICALS AT A TEMPERATURE ABOVE 100*C., SAID POLYMERIAZTION IN SAID SECOND ZONE (TUBULAR PLUG FLOW REACTOR) BEING CARRIED OUT TO A CONVERSION OF AT LEAST 94 MOL % AND UNDER NON-STEADY STATE CONDITIONS WHICH PREVENT BACK MIXING OF THE POLYMER PRODUCED IN SAID SECOND POLYMERIZATION ZONE WITH POLYMERIZATION REACTION MIXTURE FROM SAID FIRST POLYMERIZATION ZONE AND EACH SAID PERCENT BY WEIGHT BEING BASED ON THE WEIGHT OF THE MONOMER MIXTURE.
Claim 3
Dependent Claim
47 words
A process for producing pulverizable acrylic resins which have an average molecular weight of 500 to 10,000, a glass transition temperature of 40* to 70*C and an acid number of 55 to 120 mg of KOH/g of resin, said process comprising preparing a solvent-free monomer mixture of
Claim 4
Dependent Claim
47 words
A process for producing pulverizable acrylic resins which have an average molecular weight of 500 to 10,000, a glass transition temperature of 40* to 70*C and an acid number of 55 to 120 mg of KOH/g of resin, said process comprising preparing a solvent-free monomer mixture of
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein said polymerization reaction mixture is continuously withdrawn from said first polymerization zone at the same rate that said monomer mixture is introduced therein.
Claim 6
Dependent Claim
91 words
The process of claim 1 wherein said polymerization in said first polymerization zone under steady state and perfectly agitated conditions involves continuously feeding said monomer mixture to said first polymerization zone, mixing said monomer mixture with reaction mixture already in said polymerization zone within a time which is not more than one-tenth of the average residence time of the components of the reaction mixture in said polymerization zone and continuously removing polymerized reaction mixture from said zone at the same rate as said monomer mixture is supplied to said polymerization zone.
Claim 7
Dependent Claim
61 words
The process of claim 1 wherein said polymerization in said second polymerization zone (tubular plug flow reactor) under non-steady state conditions is carried out continuously by introducing withdrawn polymerization reaction mixture from said first zone while preventing back mixing of the polymer produced in said second polymerization zone (tubular plug flow reactor) with polymerization reaction mixture from said first polymerization zone.
Claim 8
Dependent Claim
39 words
The process of claim 1 wherein said polymerizing in said first polymerization zone is carried out at temperatures from 130* to 140*C and said polymerizing in said second polymerization zone is carried out at temperatures from 140* to 170*C.
Claim 9
Dependent Claim
39 words
The process of claim 1 wherein said polymerization in said first polymerization zone is carried out in the presence of 0.1 to 5 percent by weight, based on the weight of the monomer mixture, of a chain transfer agent.
Claim 10
Dependent Claim
11 words
The pulverizable acrylic resin produced by the process of claim 1.
Claim 11
Dependent Claim
15 words
The pulverizable acrylic resin of claim 7 wherein said monomer mixture consists of components I-IV.
References Cited (Backward Citations)
US3753958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |