Chemistry: electrical and wave energy – Processes and products – Processes of treating materials by wave energy
Patent
1982-12-09
1984-01-10
Schofer, Joseph L.
Chemistry: electrical and wave energy
Processes and products
Processes of treating materials by wave energy
5253338, 5253341, 525356, C08F 822
Patent
active
044252064
ABSTRACT:
Amorphous, chlorinated ethylene polymers which have relatively low blocking tendencies in the absence of antiblock additives are prepared in a multi-step process. The process involves reacting porous, solid, finely divided, high density polyethylene particles with gaseous chlorine in the presence of a free radical initiator while said particles are agitated or maintained in a fluidized bed state. In a first step, addition of gaseous chlorine is started while the agitated particles are at a temperature of less than about 50.degree. Centigrade. Little, if any, chlorination takes place in the first step. In a second step, the agitated particles are chlorinated to a level of from about 5 to about 14 percent while the temperature of said particles is increased to a temperature within a temperature range of from about 50.degree. Centrigrade to about 105.degree. Centigrade. Chlorination of the agitated particles is continued in a third step wherein the temperature of said particles is increased at a certain rate up to a temperature of from about 125.degree. Centigrade to about 132.degree. Centigrade. Chlorination of the agitated particles is completed in a fourth step while the temperature of said particles is increased to a temperature in excess of about 130.degree. Centigrade but less than that temperature at which the particles tend to agglomerate. The fourth step is continued until a percent residual relative crystallinity of less than about 2 percent is obtained and a desired chlorine content is achieved. Illustrative chlorine contents are from about 30 to about 42 percent by weight of chlorinated polymer.
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Howard D. R.
Lipman Bernard
Schofer Joseph L.
The Dow Chemical Company
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