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WEIMING QIU <WEIMING.QIU@usa.dupont.com>
2000
TI Amorphous tetrafluoroethylene-hexafluoropropylene copolymerpreparation
and use for films, coatings, additives, encapsulants, and mold release agents
IN Anolick, Colin; Petrov, Viacheslav Alexandrovich; Smart, Bruce Edmund;
Stewart, Charles Winfield; Wheland, Robert Clayton; Farnham,
William Brown; Feiring, Andrew Edward; Qiu, Weiming
PA E. I. du Pont de Nemours and Company, USA
PATENT NO. KIND DATE APPLICATION NO. DATE
--------------- ---- -------- --------------- --------
PI US 6133389 A 20001017 US 1997-869521 19970606
US 5478905 A 19951226 US 1995-384068 19950206
US 5663255 A 19970902 US 1995-549407 19951027
US 5637663 A 19970610 US 1996-596932 19960205
TI Manufacture of 3,3',5,5'-tetramethyl-2,2'-biphenol
IN Qiu, Weiming
PA E. I. Du Pont De Nemours and Co., USA
FAN.CNT 1
PATENT NO. KIND DATE APPLICATION NO. DATE
--------------- ---- -------- --------------- --------
PI US 6077979 A 20000620 US 1999-252341 19990218
TI Preparation of fluorinated quaternary ammonium salts
IN Qiu, Weiming
PA E.I. Du Pont De Nemours and Company, USA
PATENT NO. KIND DATE APPLICATION NO. DATE
--------------- ---- -------- --------------- --------
PI US 6054615 A 20000425 US 1999-321317 19990527
1997
TI Amorphous tetrafluoroethylene-hexafluoropropylene copolymers
produced by a high pressure continuous process
IN Anolick, Colin; Petrov, Viacheslav A.; Smart, Bruce E.;
Stewart, Charles W.; Wheland, Robert C.; Farnham, William
B.; Feiring, Andrew E.; Qiu, Weiming
PA E. I. Du Pont De Nemours and Company, USA
SO U.S., 31 pp. Cont.-in-part of U.S. Ser. No. 549,407.
PI US 5637663 A 970610
TI Preparation of perfluorocarbon polymers containing
phosphonic acid groups
AU Kotov, Stefan V.; Pedersen, Scot D.; Qiu, Weiming; Qiu,
Zai-Ming; Burton, Donald J.
SO J. Fluorine Chem. (1997), 82(1), 13-19
DN 125:328880
TI The Synthesis of Phosphonate Ester Containing Fluorinated
Vinyl Ethers
AU Pedersen, Scot D.; Qiu, Weiming; Qiu, Zai-Ming; Kotov,Stefan
V.; Burton, Donald J.
CS Department of Chemistry, University of Iowa, Iowa City, IA,
52242, USA
SO J. Org. Chem. (1996), 61(23), 8024-8031
AB Three novel perfluorovinyl ethers contg. phosphonate ester
groups, di-Et 1,1,2,2,3,3,5,6,6-nonafluoro-4-oxa-5-
hexenylphosphonate, (EtO)2P(O)(CF2)3OCF:CF2 (1), di-Et
1,1,2,2,4,5,5-heptafluoro-3-oxa-4- pentenylphosphonate,
(EtO)2P(O)(CF2)2OCF:CF2 (2), and di-Et 1,1,2,2,4,5,5,7,
8,8-decafluoro-4-trifluoromethyl-3,6-dioxa-7-
octenylphosphonate, CF2:CFOCF2CF(CF3)O(CF2)2P(O)(OEt)2 (3),
have been synthesized. Perfluoro vinyl ethers 1 and 2 were
synthesized from Me 4-trifluoroethenoxy-2,2,3,3,4,4-
hexafluorobutanoate and Me 3-trifluoroethenoxy-2,2,3,3-
tetrafluoropropanoate, resp., while perfluorovinyl ether 3
was synthesized either from 5-trifluoroethenoxy-4-trifluoro
methyl-3-oxa-1,1,2,2,4,5,5-heptafluoropentylsulfonyl
fluoride or Me 6-trifluoroethenoxy-5-trifluoromethyl-4-oxa-
2,2,3,3,5,6,6-heptafluorohexanoate. The carboxylate esters
were converted to the corresponding fluoroalkyl iodides via
a free-radical iododecarboxylation. The sulfonyl fluoride
was converted to itscorresponding fluoroalkyl iodide via
iododesulfination. The intermediate iodides were useful
precursors for the incorporation of the phosphonic ester
groups via a photoreaction with tetra-Et pyrophosphite to
produce di-Et fluorophosphonites. The di-Et
fluorophosphonites were oxidized to the desired
phosphonates, 1, 2, and 3, utilizing hydrogen peroxide as
the oxidant. Moderate to good overall yields of
perfluorovinyl ethers 1-3 have been achieved.
DN 125:222785
TI Manufacture of amorphous
tetrafluoroethylene-hexafluoropropylene copolymers
IN Anolick, Colin; Petrov, Viacheslav Alexandrovic; Smart,
Bruce Edmund; Stewart, Charles Winfield; Wheland, Robert
Clayton; Farnham, William Brown; Feiring, Andrew Edward;
Qiu, Weiming
PA E.I. Du Pont De Nemours and Company, USA
SO PCT Int. Appl., 78 pp.
PI WO 9624624 A2 960815
DS W: CN, JP
RW: AT, BE, CH, DE, DK, ES, FR, GB, GR, IE, IT, LU, MC, NL,
PT, SE
AI WO 96-US1840 960205
PRAI US 95-384068 950206
US 95-549407 951027
AB Amorphous tetrafluoroethylene-hexafluoropropylene
copolymers, optionally contg. third monomers, are
continuously manufd. by polymn. at 41-690
MPa/200-400.degree./5 s-30 min residence time in the
presence of radical initiators (e.g., NF3), have random
monomer distribution, and contain .gtoreq.30 mol%
hexafluoropropylene and.gtoreq.1% tetrafluoroethylene. The
polymers are useful in the form of coatings, films and
encapsulants, and mold release agents.
DN 125:166819
TI Fluorinated Ylides and Related Compounds
AU Burton, Donald J.; Yang, Zhen-Yu; Qiu, Weiming
CS Department of Chemistry, University of Iowa, Iowa City, IA,
52242, USA
SO Chem. Rev. (Washington, D. C.) (1996), 96(5), 1641-1715
AB A review with >330 refs. including discussion of fluorine
contg. stabilized phosphonium ylides, fluorinated As, N, S,
and Sb ylides, fluorophosphonates and their anions,
fluoroalkyl sulfoxides, sulfones and sulfoximines and their
anions, etc.
DN 125:10959
TI A facile and general preparation of .alpha.,.alpha.-difluoro
benzylic phosphonates by the CuCl promoted coupling reaction
of the (diethyl phosphono)difluoromethylcadmium reagent with
aryl iodides
AU Qiu, Weiming; Burton, Donald J.
CS Dep. Chemistty, Univ. Iowa, Iowa City, IA, 52242, USA
SO Tetrahedron Lett. (1996), 37(16), 2745-8
AB .alpha.,.alpha.-Difluorobenzylic phosphonates, e.g.,
(EtO)2P(O)CF2Ph, were prepd. in good yield (65-88%) by the
CuCl promoted coupling reaction of the (di-Et
phosphono)difluoromethylcadmium reagent (EtO)2P(O)CF2CdX
with aryl iodides, e.g., PhI.
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