Optical fiber comprising a cladding made of amorphous copolymers of two fluorinated ring monomers
AssigneeE. I. Du Pont de Nemours and Company
InventorPaul R. Resnick
Life of this patent
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Abstract
An optical fiber cladding made of copolymers of perfluoro( 1,3 -dimethyl-2,2-dioxole) with perfluoro(butenyl vinyl ether) and, optionally, with a third comonmer are amorphous in all monomer proportions, and soluble in perfluoro(2-butyl tetrahydrofuran). Dipolymers of the present invention have lower glass transition temperatures than dipolymers of perfluoro(1,3-dimethyl-2,2-dioxole) with tetrafluoroethylene having the same monomer proportions.
Claims4
An optical fiber consisting of a core and a cladding, the cladding being an amorphous copolymer of 1-99.5 mole % of perfluoro(2,2-dimethyl-1,3-dioxole) with a complementary amount of 99-0.5 mole % of at least one other comonomer, said copolymer being selected from the group consisting of dipolymers with perfluoro(butenyl vinyl ether) and terpolymers with perfluoro(butenyl vinyl ether) and with a third comonomer, wherein the third comonomer can be (a) a perhaloolefin in which halogen is fluorine or chlorine, but at least one half of the halogen atoms must be fluorine, or (b) a perfluoro(alkyl vinyl ether);
- the amount of the third comonomer, when present, being at most 40 mole % of the total composition.
An optical fiber consisting of a core and a cladding, the cladding being an amorphous copolymer of 1-99.5 mole % of perfluoro(2,2-dimethyl-1,3-dioxole) (PDD) with a complementary amount of 99-0.5 mole % of at least one other comonomer, said copolymer being selected from the group consisting of
- (i) dipolymers of PDD with perfluoro(butenyl vinyl ether), and
- (ii) terpolymers of PDD with perfluoro(butenyl vinyl ether) and up to 40 mole % of the terpolymer, a third comonomer, wherein the third comonomer can be
- (a) perhaloolefin in which halogen is fluorine or chlorine, but at least one half of the halogen atoms must be fluorine, or
- (b) perfluoro(alkyl vinyl ether).
Dependencies are inferred from the claim text.