# US 7,612,154 B2 · Fluoroelastomers

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- Number: US 7,612,154 B2
- Document ID: US7612154B2
- Status: Granted
- Kind: B2
- Application number: 11/488,762
- Filed: 2006-07-19
- Published: 2007-04-26
- Granted: 2009-11-03
- Earliest claimed: 2001-10-18
- Assignees: Solvay Solexis S.p.A.
- Inventors: Stefano Arrigoni; Margherita Albano
- Web page: https://patentgrep.com/patent/US7612154B2

## CPC

- C08F 236/20: unconjugated
- C08F 214/18: Monomers containing fluorine
- C08F 214/22: Vinylidene fluoride
- C08K 5/0025: {Crosslinking or vulcanising agents; including accelerators}
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

Fluoroelastomers, curable by peroxidic route, obtainable by polymerizing the following monomers: a) C2-C8 hydrogenated fluoroolefins; b) fluorovinylethers of general formula: CFX═CXOCF2OR (I) c) bis-olefins having general formula: RI1RI2 C═CRI3-Z-CRI4═CRI5RI6 (IA) and optionally: d) one or more fluorinated olefinic comonomers selected from perfluoroalkylvinylethers (PAVE) CF2═CFOR2f, perfluorooxyalkylvinylethers CF2═CFOXa, e) C2-C8 perfluorolefins; f) one or more C2-C8 non fluorinated olefinic comonomers said fluoroelastomers comprising iodine and/or bromine atoms in the chain and/or in end position.

## Claims

### Claim 1

Curable fluoroelastomers comprising units derived from the following monomers:
a) vinyl fluoride (VF), trifluoroethylene, perfluoroalkylethylenes CH2═CH—R2f wherein R2f is a C1-C6 perfluoroalkyl;
b) fluorovinylethers of general formula:
CFX═CXOCF2OR (I)
wherein
R has the following meanings:
C2-C6 linear or branched (per)fluoroalkyl,
C5-C6 cyclic (per)fluoroalkyl,
C2-C6 linear or branched (per)fluoro oxyalkyl, containing from one to three oxygen atoms,
X═F, H; and
c) bis-olefins having general formula:
RI1RI2C═CRI3-Z-CRI4—CRI5RI6 (IA)
wherein
RI1, RI.3, RI.4, RI5, RI6 equal to or different from each other, are H or C1-C5 alkyl;
Z is a C1-C18 linear or branched alkylene or C4-C18 cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical;
d) optionally, one or more fluorinated olefinic comonomers selected from the following:
(per)fluoroalkylvinylethers (PAVE) CF2═CFOR2f, wherein R2is a C1-C6 perfluoroalkyl;
(per)fluoro-oxyalkylvinylethers CF2═CFOXa, wherein Xa is a C1-C12 alkyl, or a C1-C12 oxyalkyl, or a C1-C12 (per)fluoro-oxyalkyl having one or more ether groups;
e) optionally, C2-C8 perfluoroolefins; and
f) optionally, one or more C2-C8 non fluorinated olefinic comonomers; said fluoroelastomers comprising iodine and/or bromine atoms in the chain and/or in end position, said halogen atoms deriving from “cure site” comonomers and/or from chain transfer agents used in polymerization.

### Claim 2 (depends on 1)

Fluoroelastomers according to claim 1, wherein the fluorovinylethers component b) have general formula:
CFX═CXOCF2OCF2CF2Y (II)
wherein Y═F, OCF3; X as above.

### Claim 3 (depends on 2)

Fluoroelastomers according to claim 2, wherein the perfluorovinylethers have the following formulas:
CF2═CFOCF2OCF2CF3 (MOVE 1)
CF2═CFOCF2OCF2CF2OCF3 (MOVE 2).

### Claim 4 (depends on 3)

Fluoroelastomers according to claim 3, wherein the perfluorovinylether is CF2═CFOCF2OCF2CF3 (MOVE 1).

### Claim 5 (depends on 1)

Fluoroelastomers according to claim 1, wherein in formula (IA) of the bis-olefin component c) RI1, RI2′, RI3′, RI4′RI5, RI6 are hydrogen and Z is a C4-C12 perfluoro-alkylene radical or a (per)fluoropolyoxyalkylene radical of formula:
-(Q)p-CF2O—(CF2CF2O)ma(CF2O)na—CF2-(Q)p- (IIA)
wherein:
Q is a C1-C10 alkylene or oxyalkylene radical;
p is zero or 1;
ma and na are numbers such that the ma/na ratio is from 0.2 to 5;
the molecular weight of the (per)fluoropolyoxyalkylene radical of formula (IIA) being from 500 to 10,000.

### Claim 6 (depends on 5)

Fluoroelastomers according to claim 5, wherein the bis-olefin has formula:
CH2═CH—(CF2)t0—CH═CH2
wherein t0 is an integer from 6 to 10.

### Claim 7 (depends on 5)

The fluoroelastomers of claim 5, wherein Q is —CH2OCH2— or —CH2O(CH2CH2O)SCH2—, wherein s is an integer from 1 to 3.

### Claim 8 (depends on 5)

The fluoroelastomers of claim 5, wherein the molecular weight of the (per)fluoropolyoxyalkylene radical of formula (IIA) is from 1,000 to 4,000.

### Claim 9 (depends on 1)

Fluoroelastomers according to claim 1, wherein the brominated and/or iodinated “cure site” comonomers are selected from the following:
C2-C10 bromo and/or iodo olefins, containing at least one bromine and/or iodine atom,
C1-C10 linear or branched (per)fluoroalkylvinylethers and/or (per)fluorooxyalkylvinylethers containing at least one iodine and/or bromine atom.

### Claim 10 (depends on 9)

The fluoroelastomers of claim 9, wherein the C2-C10 bromo and/or iodo olefins contain from one to three bromine and/or iodine atoms.

### Claim 11 (depends on 9)

Fluoroelastomers according to claim 9, containing iodine atoms in the chain and/or in end position.

### Claim 12 (depends on 1)

Fluoroelastomers according to claim 1, wherein iodinated and/or brominated chain transfer agents are selected from the following:
compounds of formula Rbf(I)x(Br)y, wherein Rbf is a (per)fluoroalkyl or a (per)fluorochloroalkyl having from 1 to 8 carbon atoms, while x and y are integers between 0 and 2, with 1≦x+y≦2;
iodides and/or bromides of alkaline or alkaline-earth metals.

### Claim 13 (depends on 1)

Fluoroelastomers according to claim 1, wherein the optional component d) is perfluoromethylvinylether (MVE) CF2═CF—O—CF3.

### Claim 14 (depends on 1)

Fluoroelastomers according to claim 1, wherein the amount of units deriving from the fluorovinylether component b) is higher than 15% by moles.

### Claim 15 (depends on 14)

The fluoroelastomers according to claim 14, wherein the amount of units deriving from the fluorovinylether component b) is higher than 17% by moles.

### Claim 16 (depends on 1)

Fluoroelastomers according to claim 1, wherein the total amount of units deriving from the fluorovinylether component b), from the optional monomers component d), from HFP and CTFE (component e), is higher than 15%.

### Claim 17 (depends on 16)

The fluoroelastomers according to claim 16, wherein the total amount of units deriving from the fluorovinylether component b), from the optional monomers component d), from HFP and CTFE (component e), is higher than 17% by moles.

### Claim 18 (depends on 1)

Fluoroelastomers according to claim 1, wherein the amount of units in the chain deriving from the bis-olefin component c) is from 0.01% to 2.0% by moles.

### Claim 19 (depends on 18)

The fluoroelastomers according to claim 18, wherein the amount of units in the chain deriving from the bis-olefin component c) is from 0.05% to 0.8% by moles.

### Claim 20 (depends on 1)

Fluoroelastomers according to claim 1, wherein the amount of units deriving from brominated and/or iodinated “cure-site” comonomers is from 0% to 5% by moles, the iodine and/or bromine amount from transfer agent present in the chain end groups is from 0% to 2% by weight.

### Claim 21 (depends on 20)

The fluoroelastomers according to claim 20, wherein the iodine and/or bromine amount from transfer agent present in the chain end groups is from 0.05% to 0.8% by weight.

### Claim 22 (depends on 20)

Fluoroelastomers according to claim 20, wherein the total amount of iodine and/or bromine present in the polymer is in the range 0.05% to 4% by weight.

### Claim 23 (depends on 1)

The curable fluoroelastomers of claim 1, wherein the C4-C18 cycloalkylene radical is partially fluorinated.

### Claim 24 (depends on 1)

The curable fluoroelastomers of claim 1, wherein
the C1-C6 (per)fluoroalkyl of the optional one or more fluorinated olefinic comonomers is selected from the group consisting of trifluoromethyl and heptafluoropropyl;
the C1-C12 (per)fluoro-oxyalkyl of the optional one or more fluorinated olefinic comonomers is perfluoro-2-propoxy-propyl;
the optional C2-C8 perfluoroolefins are selected from the group consisting of tetrafluoroethylene (TFE), hexafluoropropene (HFP), and chlorotrifluoroethylene (CTFE); and
the optional one or more C2-C8 non-fluorinated olefinic comonomers are selected from the group consisting of ethylene propylene and isobutene.

### Claim 25 (depends on 1)

Fluoroelastomers according to claim 1 cured by ionic route.

### Claim 26 (depends on 1)

Fluoroelastomers cured according to claim 1.

### Claim 27 (depends on 1)

Blends curable by peroxidic route containing the fluoroelastomers according to claim 1; and
(A) curing coagents, in an amount in the range 0.5% to 10% by weight with respect to the polymer;
(B) optionally a metal compound, in an amount in the range 0% to 15%, selected from oxides and hydroxides of divalent metals, optionally combined with a weak acid salt of Ba, Na, K, Pb, Ca;
(C) optionally acid acceptors, in an amount from 0% to 10% by weight with respect to the polymer, of the non metal oxide type;
(D) optionally additives, the amount of each of said additives being between 0% and 10% by weight with respect to the polymer;
(E) optionally fillers in amounts from 0% to 80% by weight with respect to the polymer.

### Claim 28 (depends on 27)

Blends curable by peroxidic route containing the fluoroelastomers according to claim 27; and
(A) curing coagents, in an amount in the range 0.5% to 10% by weight with respect to the polymer;
(B) optionally a metal compound selected from oxides and hydroxides of Mg, Zn, Ca or Pb, optionally combined with stearates, benzoates, carbonates, oxalates or phosphites of Ba, Na, K, Pb, or Ca;
(C) optionally acid acceptors selected from 1,8-bis(dimethylamino)naphthalene or octadecylamine;
(D) optionally additives selected from thickeners, pigments, antioxidants, or stabilizers;
(E) optionally a filler selected from carbon black, silica, barium sulphate, titanium dioxide, or semicrystalline fluoropolymers in amounts from 15% to 50% by weight with respect to the polymer.

### Claim 29 (depends on 27)

Manufactured articles obtained from fluoroelastomers according to claim 27.