Claims
- 1. A polytetrafluoroethylene wax composition comprising a polytetrafluoroethylene wax containing up to about 3% by weight of monomers copolymerizable with tetrafluoroethylene; which wax comprises precipitated primary particles and has a polydispersability M.sub.w /M.sub.n of from 1.5 to 2.5 and a specific surface area determined by BET of from 7 to 13 m.sup.2 /g, the size of said primary particles, prior to precipitation, ranging from 150 to 250 nm.
- 2. A wax composition as claimed in claim 1, wherein the polydispersity is from 1.5 to 2.
- 3. A wax composition as claimed in claim 1, wherein the copolymerizable monomer is a lower perfluoro- (alkyl vinyl) ether or hexafluoropropene.
- 4. A wax as claimed in claim 1, containing up to 1.6% by weight of the comonomers.
- 5. A wax composition as claimed in claim 1, wherein the specific surface area is from 8 to 12 m.sup.2.
- 6. A polytetrafluoroethylene wax composition comprising a polytetrafluoroethylene wax containing up to about 3% by weight of monomers copolymerizable with tetrafluoroethylene; which wax comprises precipitated primary particles, the repeating units of said wax having been formed by polymerizing the monomer or monomers in an aqueous medium in the presence of at least one free radical-producing inorganic initiator which was supplying free radicals essentially constantly throughout the polymerization time, said wax having a polydispersability M.sub.w /M.sub.n of from 1.5 to 2.5 and a specific surface area determined by BET of from 7 to 13 m.sup.2 /g; the size of said primary particles, prior to precipitation, ranging from 150 to 250 nm.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 31 971.8 |
Sep 1993 |
DEX |
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Parent Case Info
This application is a continuation application of 08/308,710 Sep. 19, 1994, abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
Country |
0271243 |
Jun 1988 |
EPX |
Non-Patent Literature Citations (2)
Entry |
Tuminello, W.H., et al, Macromolecules 21:2606-2610 (1988). |
Hawley's Condensed Chemical Dictionary 1987 p. 805. |
Continuations (1)
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Number |
Date |
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Parent |
308710 |
Sep 1994 |
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