Process for producing cationic water soluble polymer by reacting formaldehyde,amine,a polymer of acrylamide or methacrylamide and precipitating said polymer with a water soluble salt of a polybasic acid
Abstract
Abstract FORMALDEHYDE AND AMINE ARE CUASED TO REACT WITH AN AQUEOUS SOLUTION OF A WATER SOLUBLE POLYMER WHICH IS A HOMOPOLYMER OF ACRYLAMIDE OR METHACRYLAMIDE, A COPOLYMER OF THEM, AND A COPOLYMER OF ACRYLAMIDE OR METHACRYLAMIDE WITH A COPOLYMERIZABLE MONOMER WITH THEM AND THE POLYMER HAS MORE THAN 50 MOL PERCENT OF ACID AMIDE GROUP, AND MORE THAN 5 MOL PERCENT OF THE ACID AMIDE GROUP IS SUBJECTED TO AMINOMETHYLATION, THEREBY TO OBTAIN A CATION MODIFIED POLYMER AQUEOUS SOLUTION. A WATER SOLUBLE SALT SUCH AS A NORMAL SALT PREPARED FROM A METAL SUCH AS K, NA, LI, OR MG AND A DIBASIC ACID IS ADDED TO THE CATION MODIFIED POLYMER AQUEOUS SOLUTION TO SEPARATE A POLYMER. THE RESULTING POLYMER IS SUBJECTED TO DEHYDRATION AND DRYING AT A TEMPERATURE OF BELOW 80*C. THEREBY TO PREPARE A CATIONIC WATER SOLUBLE POLYMER.
Inventors
- 👤 K Fujimura
- 👤 K Tanaka
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |