US4894418A — Vulcanizable compositions of fluoroelastomers hav…

Claim 1

Independent Claim 328 words

Vulcanizable compositions of fluoroelastomers based on vinylidene fluoride having improved processability and improved chemical stability, comprising, as a processing coadjuvant, a mono- or di-hydroxypolyfluoroether, the hydroxy group being present at one end of the polyether chain in the case of the mono-hydroxypolyfluoroether and the two hydroxy groups being present at the opposite ends of the polyfluoroether chain in the case of the di-hydroxypolyfluoroether, said mono- or di-hydroxypolyfluoroether having no other functional groups beside the hydroxy group at the end or ends of the polyfluoroether chain, and having a mean molecular weight ranging from 400 to 10,000 for the mono-hydroxypolyfluoroether and ranging from 2,500 to 10,000 for the di-hydroxypolyfluoroether, wherein the mono-hydroxypolyfluoroether comprises repeating fluoropolyoxylalkylene units selected from the units; (1) C 3 F 6 O and CFXO whre X=F or CF 3 and said units are statistically distributed along the fluoropolyoxylalkylene chain, (2) C 3 F 6 O or (3) CH 2 CF 2 CF 2 O, and wherein the di-hydroxypolyfluoroether comprises fluoropolyoxyalkylene units; (4) C 2 F 4 O and CF 2 O and said units are statistically distributed along the fluoropolyoxyalkylene chain, (5) C 3 F 6 O, C 2 F 4 O and CFXO where X=--F or --CF 3 and said units are statically distributed along the fluoropolyoxyalkylene chain, (6) CH 2 --CF 2 --CF 2 --O-- and said units within the fluoropolyoxyalkylene chain are linked to one another in the following manner, --(O--CF 2 --CF 2 CH 2 ) p --O--R f --O--(CH 2 --CF 2 --CF 2 --O) q --, wherein R f is a fluoroalkylene group, and p and q are integers, or (7) ##STR6## and said units are linked to one another inside the fluoropolyoxyalkylene chain in the following manner ##STR7## wherein R f is a fluoroalkylene group, z is 0 or 1, and a and b are integers, said mono- or di- hydroxypolyfluoroethers being used in an amount from 0.5 to 15 parts by weight per 100 parts of fluoroelastomers.

Claim 2

Dependent Claim 328 words

Vulcanizable compositions of fluoroelastomers based on vinylidene fluoride having improved processability and improved chemical stability, comprising, as a processing coadjuvant, a mono- or di-hydroxypolyfluoroether, the hydroxy group being present at one end of the polyether chain in the case of the mono-hydroxypolyfluoroether and the two hydroxy groups being present at the opposite ends of the polyfluoroether chain in the case of the di-hydroxypolyfluoroether, said mono- or di-hydroxypolyfluoroether having no other functional groups beside the hydroxy group at the end or ends of the polyfluoroether chain, and having a mean molecular weight ranging from 400 to 10,000 for the mono-hydroxypolyfluoroether and ranging from 2,500 to 10,000 for the di-hydroxypolyfluoroether, wherein the mono-hydroxypolyfluoroether comprises repeating fluoropolyoxylalkylene units selected from the units; (1) C 3 F 6 O and CFXO whre X=F or CF 3 and said units are statistically distributed along the fluoropolyoxylalkylene chain, (2) C 3 F 6 O or (3) CH 2 CF 2 CF 2 O, and wherein the di-hydroxypolyfluoroether comprises fluoropolyoxyalkylene units; (4) C 2 F 4 O and CF 2 O and said units are statistically distributed along the fluoropolyoxyalkylene chain, (5) C 3 F 6 O, C 2 F 4 O and CFXO where X=--F or --CF 3 and said units are statically distributed along the fluoropolyoxyalkylene chain, (6) CH 2 --CF 2 --CF 2 --O-- and said units within the fluoropolyoxyalkylene chain are linked to one another in the following manner, --(O--CF 2 --CF 2 CH 2 ) p --O--R f --O--(CH 2 --CF 2 --CF 2 --O) q --, wherein R f is a fluoroalkylene group, and p and q are integers, or (7) ##STR6## and said units are linked to one another inside the fluoropolyoxyalkylene chain in the following manner ##STR7## wherein R f is a fluoroalkylene group, z is 0 or 1, and a and b are integers, said mono- or di- hydroxypolyfluoroethers being used in an amount from 0.5 to 15 parts by weight per 100 parts of fluoroelastomers.

Claim 3

Dependent Claim 65 words

The vulcanizable compositions of claim 1, wherein the monohydroxypolyfluoroether having the fluoropolyoxyalkylene units (1) are selected from those having the following formula: ##STR8## where the radicals D and E are equal to or different from each other and are selected from H, --CH 3 and --CF 3 , and m' and n' are positive integers such that the m'n' ratio ranges from 1 to 20.

Claim 4

Dependent Claim 38 words

The vulcanizable compositions of claim 1, wherein the monohydroxypolyfluoroether having the fluoropolyoxyalkylene units (2) are selected from those having the following formula: ##STR9## where r' is an integer and Z is the same as defined in claim 2.

Claim 5

Dependent Claim 43 words

The vulcanizable compositions of claim 1, wherein the monohydroxypolyfluoroether having the fluoropolyoxyalkylene units (3) are selected from those having the following formula: F(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.a'--CH.sub.2 --CF.sub.2 --Z--H where s' is an integer, and z is the same as defined in claim 2.

Claim 6

Dependent Claim 65 words

The vulcanizable compositions of claim 1, wherein the dihydroxypolyfluoroethers having the fluoropolyoxyalkylene units (4) are selected from those having the following formula: HZ--CF.sub.2 O (C.sub.2 F.sub.4 O).sub.m (CF.sub.2 O).sub.n CF.sub.2 --ZH where Z is the same as defined in claim 13, m and n are integers, and the m/n ratio ranges from 0.5 to 1.5, with the oxyfluoroalkylene units being statistically distributed along the claim.

Claim 7

Dependent Claim 59 words

The vulcanizable compositions of claim 1, wherein the dihydroxypolyfluoroethers having the fluoropolyoxyalkylene units in (5) are selected from the compounds having the following formula: HZ--CF.sub.2 --(C.sub.3 F.sub.6 O).sub.r (C.sub.2 F.sub.4 O).sub.s (CFXO).sub.t --CF.sub.2 --ZH, wherein X is --F or --CF 3 , the indexes r, s, t are integers, and Z is the same as defined in claim 2.

Claim 8

Dependent Claim 58 words

The vulcanizable compositions of claim 1, wherein the dihydroxypolyfluoroethers having the fluoropolyoxyalkylene units (6) are selected from the compounds having the formula: HZ--CF.sub.2 CH.sub.2 (OCF.sub.2 CF.sub.2 CF.sub.2).sub.p --OR.sub.f --O--(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.q CH.sub.2 CF.sub.2 --ZH where R f is a fluoroalkylene group and Z is the same as defined in claim 13, and p and q are integers.

Claim 9

Dependent Claim 50 words

The vulcanizable compositions of claim 1, wherein the dihydroxypolyfluoroethers having the fluoropolyoxyalkylene units in (7) are selected from the compounds having the formula: ##STR10## where A is a group comprising the end group --OH, n is an integer equal to or higher than 1 and a and b are integers.

Claim 10

Dependent Claim 23 words

The vulcanizable compositions of claim 1, wherein the fluoroelastomer is a copolymer of vinylidene fluoride, perfluoropropene or a blend of both with tetrafluoroethylene.

Claim 11

Dependent Claim 39 words

The vulcanizable compositions of claim 1, comprising polyfluoroethers not containing functional groups, corresponding to the mono- and di-hydroxypolyfluoroethers, as indicated in claim 1, in an amount ranging from 0.5 to 4 parts by weight per 100 parts of fluoroelastomer.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-01-15	1993-07-17	1994-01-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-01-15	1997-07-17	1998-01-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-01-15	2001-07-17	2002-01-16	$7700.00	Window Closed / Lapsed

Vulcanizable compositions of fluoroelastomers having improved characteristics of processability and of chemical stability

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