Abstract: A process for polymerizing at least one fluoromonomer in an aqueous medium containing initiator and hydrocarbon dispersing agent to form an aqueous dispersion of particles of fluoropolymer. The hydrocarbon dispersing agent comprises a compound of formula I: R—(XZ)n??I wherein R is a hydrophobic hydrocarbon moiety that comprises one or more saturated or unsaturated, non-cyclic or cyclic aliphatic groups, the percentage of total CH3 groups in relation to the total of CH3, CH2 and CH groups in said one or more aliphatic groups being at least about 70%, said hydrophobic moiety being free of siloxane units; wherein each X may be the same or different and represents an ionic hydrophilic moiety; wherein each Z may be a same or different and represents one or more counter ions for said ionic hydrophilic moiety; and wherein n is 1 to 3.

Abstract: An elastomeric fluoropolymer includes the following monomer units: about 45 mol % to about 65 mol % —CF2—CH2—; about 8 mol % to about 30 mol % —CF2—CF2—; about 4.5 mol % to about 25 mol % —CF2—CF(O—CF3)—; and about 6 mol % to about 20 mol % —CF2—CF(O—CF2—CF2—O—(CF2—O)n—CF3)—, where n is 1 or 2. In some embodiments, a composition includes an elastomeric fluoropolymer and at least one additive. In some embodiments, a composition includes a first elastomeric fluoropolymer and a second elastomeric fluoropolymer blended with the first elastomeric fluoropolymer. The first elastomeric fluoropolymer includes the following monomer units: about 45 mol % to about 65 mol % —CF2—CH2—; about 8 mol % to about 30 mol % —CF2—CF2—; about 4.5 mol % to about 25 mol % —CF2—CF(O—CF3)—; and about 6 mol % to about 20 mol % —CF2—CF(O—CF2—CF2—O—(CF2—O)n—CF3)—, where n is 1 or 2.

Abstract: Curing fluoroelastomers using curing agents of formula, R1N?CR2R3, wherein R1 is H; R2 is selected from the group consisting of H, NH2, and NR4R5; R3 is selected from the group consisting of Ph, SO2H, NR6R7, 2-pyridine, and CH2CONH2; R4 is H; R5 is selected from the group consisting of Ph, NH2, and CN; R6 is selected from the group consisting of H, NHPh, CCONH2, C1 to C8 linear alkyl group, and C1 to C8 branched alkyl group; and R7 is selected from the group consisting of Ph, COOC(CH3)3, NH2, CH2COOH, CSNH2, CNHNH3+Cl?, p-phenylCN, COPh,

Abstract: Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with certain hydrazone or oxime curatives.

Abstract: A fluoroelastomer compound comprising at least one co-agent and at least one chemical entity comprising: (1) an azo functional group or (2) an oxazoline functional group, when cured into an article using a peroxide curing agent, the article exhibits no visible particles on the article surface when viewed at a magnification of 500 times that of an unmagnified image.

Abstract: Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with certain hydrazone or oxime curatives.

Abstract: Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with certain hydrazone or oxime curatives.

Abstract: Curing fluoroelastomers using curing agents of formula, R1N?CR2R3, wherein R1 is H; R2 is selected from the group consisting of H, NH2, and NR4R5; R3 is selected from the group consisting of Ph, SO2H, NR6R7, 2-pyridine, and CH2CONH2; R4 is H; R5 is selected from the group consisting of Ph, NH2, and CN; R6 is selected from the group consisting of H, NHPh, CCONH2, C1 to C8 linear alkyl group, and C1 to C8 branched alkyl group; and R7 is selected from the group consisting of Ph, COOC(CH3)3, NH2, CH2COOH, CSNH2, CNHNH3+Cl?, p-phenylCN, COPh,

Abstract: Curing fluoroelastomers using curing agents of formula, R1N?CR2R3, wherein R1 is H; R2 is selected from the group consisting of H, NH2, and NR4R5; R3 is selected from the group consisting of Ph, SO2H, NR6R7, 2-pyridine, and CH2CONH2; R4 is H; R5 is selected from the group consisting of Ph, NH2, and CN; R6 is selected from the group consisting of H, NHPh, CCONH2, C1 to C8 linear alkyl group, and C1 to C8 branched alkyl group; and R7 is selected from the group consisting of Ph, COOC(CH3)3, NH2, CH2COOH, CSNH2, CNHNH3+Cl?, p-phenylCN, COPh,

Abstract: Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with certain hydrazone or oxime curatives.

Abstract: A fluoroelastomer compound comprising at least one co-agent and at least one chemical entity comprising: (1) an azo functional group or (2) an oxazoline functional group, when cured into an article using a peroxide curing agent, the article exhibits no visible particles on the article surface when viewed at a magnification of 500 times that of an unmagnified image.

Abstract: The process is provided for forming the reaction product comprising the homologue mixture of I(CF2)nI, wherein n is 3 to 7, which may contain at least one of the contaminants ICF2I and I(CF2)2I, by the steps comprising (a) reacting iodine with hexafluoropropylene oxide at a temperature of 150° C. to 210° C. in a reactor, the amount of said hexafluoro-propylene oxide being a portion of the total amount of hexafluoropropylene oxide to be reacted with said iodine, thereby forming a reaction product containing gaseous perfluoroacetyl fluoride as a reaction by-product, (b) cooling said reaction product to become liquid except for said gaseous perfluoroacetyl fluoride, (c) venting said perfluoroacetyl fluoride from said reactor, and (d) repeating said steps (a), (b), and (c) until said total amount of said HFPO is reacted with said iodine.

Abstract: Curing fluoroelastomers using curing agents of formula, R1N?CR2R3 , wherein R1 is H; R2 is selected from the group consisting of H, NH2, and NR4R5; R3 is selected from the group consisting of Ph, SO2H, NR6R7, 2-pyridine, and CH2CONH2; R4 is H; R5 is selected from the group consisting of Ph, NH2, and CN; R6 is selected from the group consisting of H, NHPh, CCONH2, C1 to C8 linear alkyl group, and C1 to C8 branched alkyl group; and R7 is selected from the group consisting of Ph, COOC(CH3)3, NH2, CH2COOH, CSNH2, CNHNH3+Cl31 , p-phenylCN, COPh,

Abstract: The present invention is the process comprising forming a stable mixture comprising I(CF2)nI, wherein n is at least 3 and at least one of I(CF2)nI, wherein n is 1 or 2, as a contaminant in said mixture and heating said mixture to a temperature of at least 220° C. to reduce the amount of said contaminant to be no greater than 1% when said contaminant is ICF2I (n=1) and no greater than 0.1% when said contaminant is ICF2CF2I (n=2).

Abstract: The process is provided for forming the reaction product comprising the homologue mixture of I(CF2)nI, wherein n is 3 to 7, which may contain at least one of the contaminants ICF2I and I(CF2)2I, by the steps comprising (a) reacting iodine with hexafluoropropylene oxide at a temperature of 150° C. to 210° C. in a reactor, the amount of said hexafluoro-propylene oxide being a portion of the total amount of hexafluoropropylene oxide to be reacted with said iodine, thereby forming a reaction product containing gaseous perfluoroacetyl fluoride as a reaction by-product, (b) cooling said reaction product to become liquid except for said gaseous perfluoroacetyl fluoride, (c) venting said perfluoroacetyl fluoride from said reactor, and (d) repeating said steps (a), (b), and (c) until said total amount of said HFPO is reacted with said iodine.

Abstract: The present invention is the process comprising forming a stable mixture comprising I(CF2)nI, wherein n is at least 3 and at least one of I(CF2)nI, wherein n is 1 or 2, as a contaminant in said mixture and heating said mixture to a temperature of at least 220° C. to reduce the amount of said contaminant to be no greater than 1% when said contaminant is ICF2I (n=1) and no greater than 0.1% when said contaminant is ICF2CF2I (n=2).

Abstract: Disclosed herein is a curable composition comprising a polyhydroxy curable fluoroelastomer, a polyhydroxy curative, a cure accelerator and an unsaturated metal compound process aid comprising a siloxane having at least one vinyl or allyl group bonded to a silicon atom. Such curable compositions have a lower Mooney viscosity than do similar compositions absent the process aid.

Abstract: Disclosed herein is a curable composition comprising a polyhydroxy curable fluoroelastomer, a polyhydroxy curative, a cure accelerator and an unsaturated metal compound process aid. Such curable compositions have a lower Mooney viscosity than do similar compositions absent the process aid.

Abstract: Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with certain carbazates. The carbazate is of the general formula R1OC(O)NHNHR2, wherein R1 is 9-fluorenylmethyl, benzyl, aryl, or a heterocycle; R2 is H, alkyl, aryl, heterocycle, CO2R3 or CH2R4; R3 is alkyl, aryl, benzyl or a heterocycle; and R4 is a fluoroalkyl group.

Abstract: Fluoroelastomer compositions comprising fluoroelastomers having copolymerized units of a nitrile-containing cure site monomer are cured with certain hydrazide curatives. The hydrazide is of the general formula R1(C(O))nNHNHR2, wherein n is 1 or 2; R1 is NH2, NHNH2, NHR3, NR32, NHNHC(O)NH2, NHNHC(O)NHNH2, NHNHR2, or NHC(O)NHNH2; R2 is H, alkyl, aryl, heterocycle, CO2R3, C(O)R3, CH2R4, or C(O)R4; R3 is alkyl, aryl, heterocycle, or CH2R4; and R4 is a fluoroalkyl group.