Process for the manufacture of high solids, free-flowing, granular poly(dimethyldiallyl ammonium chloride)
US4654378A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 1984 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | May 2, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S522/903
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The instant invention is directed to a process for the manufacture of poly(dimethyldiallyl ammonium chloride) comprising: PA1 (a) casting upon a continuous belt apparatus to form a film having a thickness of 1/4 inch to 1 inch an aqueous dimethyldiallyl ammonium chloride solution having a monomer concentration of at least 65 percent, by weight, monomer, said monomer solution also containing a photoreducible dye in a concentration of 1.times.10.sup.-7 to 1.times.10.sup.-4 moles per liter, a mild reducing agent in a concentration of 1.times.10.sup.-5 to 1.times.10.sup.-2 moles per liter and thermal initiator in a concentration of 1.times.10.sup.-5 to 1.times.10.sup.-2 moles per liter; PA1 (b) passing of the solution under a series of lights which emit visible light at an intensity of 0.1 to 10,000 foot candles and controlling the temperature of the monomer solution in the range of 5.degree. C. to 65.degree. C.; PA1 (c) allowing the polymerization to proceed until a polymer gel is formed; PA1 (d) reducing the size of the polymer gel of step (c) by a size reduction means, so as to produce polymer gel particles which are less than 1 inch in their longest dimension; and PA1 (e) further p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.