EP0224201A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Functionalized perfluoropolyethers and process for their preparation
Assignee: Syensqo Specialty Polymers Italy SpA
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Filing: 1986-11-20
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Granted: —
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Expires: 2006-11-20
Abstract
Abstract A process is disclosed for cracking high molecular weight perfluoropolyethers having neutral end groups obtained from the photooxidation of perfluoroolefins or the fluorination of hydrogenated polyalkylene oxides or by polymerization with opening of the partially fluorinated oxetane ring, said process being carried out in the presence of catalysts composed of fluorides, oxyfluorides or oxides of transition metals or of Al, Sn, Sb at temperatures of from 150 to 380°C. The cracking process leads to the formation of low molecular weight perfluoropolyethers having neutral and acid end groups. The perfluoropolyether acids may be converted to functionalized perfluoropolyethers and are useful to produce new polymers.
Inventors
- 👤 Gerardo Caporiccio
- 👤 Gian Tommaso Viola
- 👤 Giuseppe Marchionni
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 18:30
CPC Classifications
C; C07; C07C; C07C69/00; C07C69/62; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/321; C08G65/323; C08G65/3233; C08G65/3236; C08G65/002; C08G65/005; C08G65/007
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
9 words
A process for cracking perfluoropolyethers of the following classes:
Claim 2
Dependent Claim
9 words
A process for cracking perfluoropolyethers of the following classes:
Claim 3
Dependent Claim
131 words
wherein n, m, p, q and r are integers, n ranges from 2 to 200; m, p, q and r range from 1 to 100 and the sum m+p+q+r ranges from 4 to 400; R f is CF₃ of C₂F₅; A is F or OR f ; B and D are perfluoroalkyl groups having 1 to 3 carbon atoms; and E is F or OR′ f , where R′ f is a perfluoropolyalkyl group having 1 to 3 carbon atoms; which comprises heating the perfluoropolyethers of formulae I, II or III to temperatures ranging from 150 to 380°C in the presence of a catalyst composed of fluorides, oxyfluorides or oxides of transitions metals selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Mo, Zn or of Al, Sn, Sb.
Claim 4
Dependent Claim
131 words
wherein n, m, p, q and r are integers, n ranges from 2 to 200; m, p, q and r range from 1 to 100 and the sum m+p+q+r ranges from 4 to 400; R f is CF₃ of C₂F₅; A is F or OR f ; B and D are perfluoroalkyl groups having 1 to 3 carbon atoms; and E is F or OR′ f , where R′ f is a perfluoropolyalkyl group having 1 to 3 carbon atoms; which comprises heating the perfluoropolyethers of formulae I, II or III to temperatures ranging from 150 to 380°C in the presence of a catalyst composed of fluorides, oxyfluorides or oxides of transitions metals selected from Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zr, Mo, Zn or of Al, Sn, Sb.
Claim 5
Dependent Claim
17 words
A process according to claim 1, wherein the carcking is carried out in the presence of fluorine.
Claim 6
Dependent Claim
28 words
A process according to claim 1 or 2, wherein the amount of catalyst ranges from 0.1 to 10% by weight, based on the weight of the starting perfluoropolyether.
Claim 7
Dependent Claim
24 words
A process according to any one of claims 1 to 3, wherein the crack products are continuously removed from the reacting mixture by distillation.
Claim 8
Dependent Claim
17 words
Neutral perfluoropolyethers having a low molecular weight, prepared according to the process of claims 1 or 2.
Claim 9
Dependent Claim
10 words
Perfluoropolyethers consisting of the repeating units: I′) -CF₂CF₂O-, II′) -CF₂CF₂CF₂O-
Claim 10
Dependent Claim
10 words
Perfluoropolyethers consisting of the repeating units: I′) -CF₂CF₂O-, II′) -CF₂CF₂CF₂O-
Claim 11
Dependent Claim
19 words
wherein one or both end groups are of the formula: -(O)CF₂COF for class I′) and -(O)CF₂CF₂COF for class II′).
Claim 12
Dependent Claim
19 words
wherein one or both end groups are of the formula: -(O)CF₂COF for class I′) and -(O)CF₂CF₂COF for class II′).
Claim 13
Dependent Claim
9 words
Perfluoropolyethers consisting of the repeating units: I′) -CF₂CF₂O- II′)-CF₂CF₂CF₂O-
Claim 14
Dependent Claim
9 words
Perfluoropolyethers consisting of the repeating units: I′) -CF₂CF₂O- II′)-CF₂CF₂CF₂O-
Claim 15
Dependent Claim
18 words
wherein one or both end groups are of the formula: -(O)CF₂COOH for class I′), -(O)CF₂CF₂COOH for class II′).
Claim 16
Dependent Claim
18 words
wherein one or both end groups are of the formula: -(O)CF₂COOH for class I′), -(O)CF₂CF₂COOH for class II′).
Claim 17
Dependent Claim
10 words
Perfluoropolyethers consisting of the repeating units: I′) -CF₂CF₂O- II′) -CF₂CF₂CF₂O-
Claim 18
Dependent Claim
10 words
Perfluoropolyethers consisting of the repeating units: I′) -CF₂CF₂O- II′) -CF₂CF₂CF₂O-
Claim 19
Dependent Claim
30 words
wherein one or both groups are represented by functional groups capable of providing polymeric products by polycondensation or polyaddition reactions, said polymers being characterized by a Tg lower than -78°C.
Claim 20
Dependent Claim
30 words
wherein one or both groups are represented by functional groups capable of providing polymeric products by polycondensation or polyaddition reactions, said polymers being characterized by a Tg lower than -78°C.
References Cited (Backward Citations)
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