Fluorine-containing graft copolymer and adhesive and composite membrane made thereof

Claim 2

A graft copolymer consisting essentially of a main chain polymer having a glass transition temperature (Tg) of at least 30° C. and a graft chain fluorine-containing polymer having a repeating unit of the formula: ##STR10## wherein R 1 is a hydrogen atom or a lower alkyl group, and R 2 is a polyfluoroalkyl group and wherein said graft copolymer is produced by solution polymerization and is soluble in a low boiling point solvent having an affinity with a fluorinated polymer.

Claim 3

The graft copolymer according to claim 1, wherein the graft rate in the graft copolymer is 10% by weight.

Claim 4

The graft copolymer according to claim 1, wherein the main chain polymer is selected from the group consisting of polyolefins, polysulfones, polyphenyleneoxides and polyimides.

Claim 5

The graft copolymer according to claim 1, wherein the main chain polymer is a homopolymer of a monomer selected from the group consisting of styrene, vinylnaphthalene, p-methylstyrene, p-tert-butylstyrene, m-methylstyrene, cyclohexylethylene, 3,3-dimethylbutylethylene, 2-tert-butylphenyl acrylate, pentachlorophenyl acrylate, 3,5-dimethyladamantyl acrylate, benzyl methacrylate, cyanoethyl methacrylate, ethyl methacrylate, vinyl chloride, 1,1,1-trifluoro-2-propyl methacrylate, methyl methacrylate, acrylonitrile, methyl chloroacrylate, methyl fluoroacrylate, pentafluorostyrene, α, β, β-trifluorostyrene, tetrafluoroethylene and trifluoroethylene, or a copolymer of such a monomer with a monomer having a substituent capable of forming a graft site or a substituent capable of introducing a substituent capable of forming a graft site.

Claim 6

The graft copolymer according to claim 4, wherein the substituent capable of forming a graft site is an aromatic nitro group, a mercapto group, an aromatic amino group, an aromatic quinonyl group, an aliphatic azo group, a peroxyl group, a hydroperoxyl group, a ketonic carbonyl group, an aromatic diazonium group, a halogen atom, a brominated alkyl group, an iodinated alkyl group, a halogenated aryl group, an aromatic carbonyl group, a methoxy cumyl group, a cyano group, a substituent containing an alkoxycarbonyl group, a cyano group or a sulfonyl group, a disilyl group, or a 1-alkoxy-1-trialkylsilylalkenyl group.

Claim 7

The graft copolymer according to claim 1, wherein the main chain polymer has a molecular weight within a range of from 10 4 to 10 7 .

Claim 8

The graft copolymer according to claim 1, wherein the fluorine-containing polymer is poly(2,2,3,3,4,4,4-heptafluorobutyl acrylate), poly(2,2,3,3,4,4-hexafluorobutyl acrylate), poly(2,2,2-trifluoroacrylate), poly(fluoromethyl acrylate), poly(5,5,6,6,7,7,7-heptafluoro-3-oxaheptyl acrylate), poly(2,2,3,3,5,5,5-heptafluoro-4-oxapentyl acrylate), poly(2,2,3,3,4,4,5,5,5-nonafluoropentyl acrylate), poly(3,3,4,4,5,5,6,6,6-nonafluorohexyl methacrylate), poly(heptafluoro-2-propyl acrylate), poly(2,2,3,3,3-pentafluoropropyl acrylate), poly(2,2,3,3,4,4,5,5,6,6,6-undecafluorohexyl acrylate), poly(1,1,1,3,3,3-hexafluoroprop-2-yl-acrylate) or poly(3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl acrylate).

Claim 9

An adhesive composed essentially of a graft copolymer as defined in claim 1.