Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1996-07-19
1997-09-16
Lipman, Bernard
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525344, 525356, C08F 838
Patent
active
056682204
ABSTRACT:
Chlorinated and chlorosulfonated polyethylenes are produced by chlorinating substantially linear olefin polymers having a melt flow ratio, I.sub.10 /I.sub.2, .gtoreq.5.63, a molecular weight distribution, M.sub.w /M.sub.n, defined by the equation: M.sub.w /M.sub.n .gtoreq.(I.sub.10 /I.sub.2)-4.63, a critical shear rate at onset of gross melt fracture of at least 50 percent greater than the critical shear rate at the onset of surface melt fracture of a linear olefin polymer having about the same I.sub.2 and Mw/Mn and at least about 0.01 long chain branches/1000 carbons and a molecular weight distribution from about 1.5 to about 2.5 and their method of manufacture are disclosed. The chlorosulfonated polyethylenes are produced by treating the chlorinated polyethylenes with a mixture of gaseous chlorine and sulfur dioxide.
REFERENCES:
patent: Re29350 (1977-08-01), Schoen
patent: 4584351 (1986-04-01), Blanchard
patent: 4704439 (1987-11-01), Yamaoka
patent: 4707522 (1987-11-01), Stephens et al.
patent: 5272236 (1993-12-01), Lai et al.
Berard Mark T.
Effler, Jr. Lawrence J.
Wright George D.
Lipman Bernard
The Dow Chemical Company
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