Process for preparing low molecular weight polymers

Details Process for preparing low molecular weight polymers Process for preparing low molecular weight polymers

1992-09-28

1994-07-12

Schofer, Joseph L.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526230, 526235, 526271, 5263171, 5263182, C08F 434, C08F 428, C08F 2006, C08F 2206, C08F 2202

Patent

active

053289722

ABSTRACT:
A process for preparing polymers having molecular weights below 5,000 and polydispersity below 2.5 is provided. The polymerization is conducted in supercritical carbon dioxide at temperatures of at least 200.degree. C. and pressures above 3,500 psi. The process can be continuous, semi-continuous, or batch. The polymers are useful as detergent additives, scale inhibitors, dispersants and crystal growth modifiers.

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patent: 4748220 (1988-05-01), Hartmann et al.
patent: 5212229 (1993-05-01), Taylor et al.
J. M. DeSimone, Zihibin Guan, C. S. Elsbernd, Science, 257(5072), 945-7, Aug. 14, 1992.
J. A. Hyatt, "Liquid and Supercritical Carbon Dioxide as Organic Solvents", J. Org. Chem., 1984, 49, 5097-5101, published in USA.
K. M. Scholsky, "Supercritical Polymerization Reactions", Polymer Reprints, 1990, 31(1), 685-686, published in USA.
T. Spychaj, et al., "High Temperature Continuous Bulk Copolymerization of Styrene and Acrylic Acid; Thermal Behavior of the Reactants", J. Appl. Polymer Science, 1991, vol. 42, 2111-2119, published in USA.

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