Partially hydrolyzed chlorosulfonated polyolefin elastomers
View Patent ↗At least partially hydrolyzed chlorosulfonated polyolefin elastomers containing 0.5-10 weight percent chlorine and 0.25 to 5 weight percent sulfur are prepared from low density polyethylene or from linear ethylene/alpha-olefin copolymer base resins having a ratio of weight average molecular weight (Mw) to number average molecular weight (Mn) less than 3.5.
1. A chlorosulfonated polyolefin composition comprising at least one chlorosulfonated polyolefin having 0.5 to 10 weight percent chlorine, 0.25 to 5 weight percent sulfur, based on total weight of said chlorosulfonated polyolefin, and a plurality of —SO 3 H groups, and wherein said chlorosulfonated polyolefin is produced from a polyolefin base resin selected from the group consisting of i) a low density polyethylene and ii) a linear copolymer comprising copolymerized units of 45 to 80 weight percent ethylene and 55 to 20 weight percent, based on total weight of said linear copolymer, of an alpha-olefin having 3 to 20 carbon atoms, said linear olefin copolymer having a ratio of Mw/Mn less than 3.5.
2. A chlorosulfonated polyolefin composition of claim 1 wherein said base resin is a linear copolymer and wherein said alpha-olefin is selected from the group consisting of octene-1, butene-1 and propylene.
3. A chlorosulfonated polyolefin composition of claim 2 wherein said alpha-olefin is octene-1.
4. A chlorosulfonated polyolefin composition of claim 2 wherein said alpha-olefin is butene-1.
5. A chlorosulfonated polyolefin composition of claim 2 wherein said alpha-olefin is propylene.
6. A chlorosulfonated polyolefin composition of claim 1 wherein said linear olefin copolymer has a density between 0.85 and 0.91 g/cm 3 .
7. A chlorosulfonated polyolefin composition of claim 1 wherein said base resin is low density polyethylene.
8. A chlorosulfonated polyolefin composition of claim 7 wherein said low density polyethylene has a Melt Index, condition 190° C., 2.16 kg, between 2000 and 1 gram/10 minutes and a density between 0.890 and 0.920.
9. A chlorosulfonated polyolefin composition of claim 1 wherein said weight percent chlorine is between 0.75 and 8 and wherein said weight percent sulfur is between 0.35 and 3.
10. A chlorosulfonated polyolefin composition of claim 9 wherein said weight percent chlorine is between 1 and 5 and wherein said weight percent sulfur is between 0.5 and 2.
11. A chlorosulfonated polyolefin composition of claim 1 comprising at least 2 chlorosulfonated polyolefins, each having 0.5 to 10 weight percent chlorine, 0.25 to 5 weight percent sulfur, based on total weight of each said chlorosulfonated polyolefin, and a plurality of —SO 3 H groups and wherein each of said chlorosulfonated polyolefins is produced from a different polyolefin base resin selected from the group consisting of i) a low density polyethylene and ii) a linear copolymer comprising copolymerized units of 45 to 80 weight percent ethylene and 55 to 20 weight percent, based on total weight of said linear copolymer, of an alpha-olefin having 3 to 20 carbon atoms, said linear olefin copolymer having a ratio of Mw/Mn less than 3.5.