Amorphous tetrafluoroethylene-hexafluoropropylene copolymers

An amorphous polymer consisting essentially of, repeat units of the formula:

• (a) at least about 30 mole percent of
• —CF(CF3)—CF2— (I)
• (b) at least about 1 mole percent
• —CF2—CF2— (II)
• (c) 0 to about 10 mole percent
• wherein X is —CnF2n+1 or —OCnF2n+1, m is 2, 3 or 4, and n is an integer of 2 to 20, with —CnF2n+1 or an integer of 1 to 20 with —OCnF2n+1;
• and
• provided that in said polymer less than 20 mole percent of (I) is present in the form of triads which has a molecular weight distribution of about 4 or less.

A fish hook coated with an amorphous polymer consisting essentially of, repeat units of the formula:

• (a) at least about 30 mole percent of
• —CF(CF3)—CF2— (I)
• (b) at least about 1 mole percent
• —CF2—CF2— (II)
• (c) 0 to about 10 mole percent
• wherein X is —CnF2n+1 or —OCnF2n+1, m is 2, 3 or 4, and n is an integer of 2 to 20, with —CnF2n+1 or an integer of 1 to 20 with —OCnF2n+1;
• and provided that in said polymer less than 20 mole percent of (I) is present in the form of triads.

An amorphous polymer containing repeat units derived from:

• 27-60 mole percent hexafluoropropylene, up to 35 mole percent total of one or more second monomers, and tetrafluoroethylene, provided that at least one mole percent of TFE is present in the polymer, and wherein said second monomer is ethylene, vinyl fluoride, trifluoroethylene, 3,3,3-trifluoropropene, 2,3,3,3-tetrafluoropropene, 4-bromo-3,3,4,4-tetrafluoro-1-butene, ethylene CH2═CHO(C═O)R2 wherein R2 is perfluoro-n-alkyl containing 1 to 8 carbon atoms, CH2═CHR3 wherein R3 is perfluoro- n-alkyl containing 1 to 8 carbon atoms, CH2═CH(C═O)OR4 wherein R4 is CnFxHy wherein x+y=2n+1 and n is 1 to 8, chlorotrifluoroethylene, or allyltrimethoxysilane;
• 27-60 mole percent hexafluoropropylene, up to 5 mole percent total of one or more fourth monomers and tetrafluoroethylene, provided that the polymer contains at least 1 mole percent tetafluoroethylene, wherein said fourth monomer is perfluorocyclopentene, perfluorocyclobutene, CF2═CFCF2CN, CF2═CFR5 wherein R5 is perfluoroalkyl optionally containing one or more of one or more ether groups, one cyano group, or one sulfonyl fluoride group, perfluoro(2-metylene-4-methyl-1,3-dioxolane), perfluoro(2- methyl-2,3-dihydro-1,4-dioxin), or FSO2CF2CF2OCF(CF3)CF2OCF═CF2;
• or
• up to 30 mole percent total of one or more second monomer and up to 5 mole percent total of one or more fourth monomers.

An amorphous copolymer, consisting essentially of:

• (a) >15 mole percent of the repeat unit
• —CF(CF3)—CF2— (I)
• (b) at least 1 to about 60 mole percent of the repeat unit
• —CF2—CF2— (II)
• (c) about 0.1 to about 85 mole percent of the repeat unit
• —CH2—CF2— (IV)
• wherein no more than about 20 mole percent of (I) is present in triads.

An amorphous copolymer, consisting essentially of repeat units of the formula:

• (a) >15 mole percent of the repeat unit
• —CF(CF3)—CF2— (I)
• (c) about 0.1 to about 85 mole percent of the repeat unit
• —CH2—CF2— (IV)
• wherein no more than about 20 mole percent of (I) is present in triads.

An ice release coating comprising a polymer selected from the group consisting of polymers (a), (b) and (c) as follows:

• (a) having at least about 30 mole percent of
• —CF(CF3)—CF2—;
• (I)
• at least about 1 mole percent
• —CF2—CF2—;
• (II)
• and
• at least 0 to about 10 mole percent
• wherein X is —CnF2n+1 or —OCnF2n+1, m is 2, 3 or 4, and n is an integer of 2 to 20, with —CnF2n+1 or an integer of 1 to 20 with —OCnF2n+1;
• and
• provided that in said polymer less than 20 mole percent of (I) is present in the form of triads;
• (b) an amorphous polymer containing repeat units derived from:
• 27-60 mole percent hexafluoropropylene, up to 35 mole percent total of one or more second monomers, and the balance tetrafluoroethylene, provided that at least one mole percent of TFE is present in the polymer, and wherein said second monomer is ethylene, vinyl fluoride, trifluoroethylene, 3,3,3-trifluoropropene, 2,3,3,3-tetrafluoropropene, 4-bromo-3,3,4,4-tetrafluoro-1-butene, ethylene CH2═CHO(C═O)R2 wherein R2 is perfluoro-n-alkyl containing 1 to 8 carbon atoms, CH2CHR3 wherein R3 is perfluoro-n-alkyl containing 1 to 8 carbon atoms, CH2═CH(C═O)OR4 wherein R4 is CnFxHy wherein x+y=2n+1 and n is 1 to 8, chlorotrifluoroethylene, or allyltrimethoxysilane;
• 27-60 mole percent hexafluoropropylene, up to 5 mole percent total of one or more fourth monomers and the balance tetrafluoroethylene, provided that the polymer contains at least 1 mole percent tetrafluoroethylene, wherein said fourth monomer is perfluorocyclopentene, perfluorocyclobutene, CF2═CFCF2CN, CF2═CFR5 wherein R5 is perfluoroalkyl optionally containing one or more of one or more ether groups, one cyano group, or one sulfonyl fluoride group, perfluoro(2-metylene-4-methyl-1,3-dioxolane), perfluoro(2-methyl-2,3-dihydro-1,4-dioxin), or FSO2CF2CF2OCF(CF3)CF2OCF═CF2;
• or up to 30 mole percent total of one or more second monomers and up to 5 mole percent total of one or more fourth monomers;
• and
• (c) an amorphous copolymer, consisting essentially of:
• (a) >15 mole percent of the repeat unit
• —CF(CF3)—CF2— (I)
• (b) at least 1 to about 60 mole percent of the repeat unit
• —CF2—CF2— (II)
• (c) about 0.1 to about 85 mole percent of the repeat unit
• —CH2—CF2— (IV)
• wherein no more than about 20 mole percent of (I) is present in triads.

An amorphous copolymer, consisting essentially of:

• (a) >10 mole percent of the repeat unit
• —CF(CF3)—CF2— (I)
• (b) up to about 32 mole percent of the repeat unit
• —CF2—CF2— (II)
• (c) about 53 to about 85 mole percent of the repeat unit
• —CH2—CF2— (IV)
• wherein the sequence
• —(CH2CF2)—(CH2CF2)—(CF2CH2)— (S1)
• is present in an amount according to an equation
• mole percent S1≦0.23(mole percent VF2 in polymer)−10.2.