Detail of "69418-26-4"

Reference

Suspension polymerization

Suspension polymerization. Flesher, Peter; Allen, Adrian Swinburn (Allied Colloids Ltd., UK). Eur. Pat. Appl. EP 102760 A2 14 Mar 1984, 27 pp. DESIGNATED STATES: R: DE, FR, GB, IT, SE. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: C08F002-32. APPLICATION: EP 83-304490 3 Aug 1983. PRIORITY: GB 82-22932 9 Aug 1982. DOCUMENT TYPE: Patent CA Section: 35 (Chemistry of Synthetic High Polymers) An ionic monomer is suspension polymd. in the presence of a stabilizer of opposite ionic or potentially ionic charge and a water-sol. substantially oil-insol. ionic nonpolymerizable compd. having the same charge type as the monomer and having 31 C36 alkyl groups. Thus, a mixt. of acrylamide 46.8, trimethyl-b-acryloxyethylammonium chloride 80.3, tetra-Na EDTA 0.03, K bromate 0.032, cocotrimethylammonium methosulfate (I) 0.02, and water 81.2 g having pH 4.0 was added to a mixt. of 300 g Shell SBP 11 and 0.02 g cetostearyl methacrylate-methacrylic acid copolymer stabilizer. After 3 min at 25°, the suspension was initiated by adding 6.5 mL 1% wt./vol. soln. of SO2 in Shell SBP 11 to give a suspension of polymer [69418-26-4] beads having particle size distribution 200-750 m with <5% misshapen particles, compared with 200-2500 m with >70% grossly misshapen oblate spheroids without I.

Exothermic reactions

Exothermic reactions. Flesher, Peter; Farrar, David; Johnson, Ian Michael (Allied Colloids Ltd., UK). Eur. Pat. Appl. EP 123486 A2 31 Oct 1984, 22 pp. DESIGNATED STATES: R: BE, DE, FR, GB, IT, NL, SE. (English). (European Patent Organization). CODEN: EPXXDW. CLASS: IC: B01J019-00; B01J013-00; C09K005-06; C08F002-00. ICA: C08F020-00. APPLICATION: EP 84-302555 13 Apr 1984. PRIORITY: GB 83-10662 20 Apr 1983. DOCUMENT TYPE: Patent CA Section: 37 (Plastics Manufacture and Processing) A method is described for preping a product such as a polymer gel, by an exothermic process in a liq. medium which contains a particulate material acting as a heat sink, e.g., a hydrate of an inorg. salt which functions as a heat sink by undergoing a change in the degree of hydration. The method is esp. useful for controlling the temp. during emulsion and dispersion polymn. Thus, a slurry comprising H2C:CHCO2CH2CH2N+Me3 Cl- 25, acrylamide 25, and water 50 g was mixed at 0° with 82.4 g Na2SO4.10H2O, blown with N, and treated with 5 mL 1% aq. (NH4)2S2O8 and 1 mL 0.7% aq. ferrous ammonium sulfate to initiate polymn. Stirring was stopped when the temp. reached 20°. The temp. rose to ~32° and remained const. The product [69418-26-4] was a friable gel which was dried and grounded to give a powder. The polymer had intrinsic viscosity 6.18 dL/g and caused flocculation during 27 s in a test with sewage sludge, compared with 2.83 dL/g and 272.1 s, resp., for a polymer prepd. similarly but in the absence of Na2SO4.10H2O.