Patent GB-1076488-A (GB)
Title: Fluorine-containing polymers
IPC: C08F16/24
Filed: 1965-11-01
Abstract: A copolymer is obtained by copolymering (1) tetrafluoroethylene; (2) at least one aliphatic hydrocarbon having from 2 to 8 carbon atoms and only one terminal ethylenically unsaturated group; (3) at least one polymerizable ethylenically unsaturated acid having an acidity constant of from 1.0 to 5.5, or a functional derivative thereof and optionally (4) a further polymerizable ethylenically unsaturated compound. Component (2) is preferably ethylene. Component (3) is preferably (a) an ethylenically unsaturated mono- or dicarboxylic acid having from 3 to 11 carbon atoms; (6) a lower alkyl mono or diester, a salt or anhydride of (a), (c) an ethylenically unsaturated phosphonic acid having from 3 to 18 carbon atoms or (d) a lower alkyl mono or diester, a salt or anydride of (c). Component (4) may be an aliphatic hydrocarbon of from 3 to 8 carbon atoms, a fluoro-olefin of 2 to 3 carbon atoms, a chloro-olefin of 2 to 3 carbon atoms, a chlorofluoroolefin of 2 to 3 carbon atoms, a vinyl alkyl ether wherein the alkyl group contains from one to six carbon atoms, or a vinyl ester of an alkane carboxylic acid having from 2 to 18 carbon atoms.  The copolymerization is carried out in an inert media, in the presence of a freeradical initiator and when component (2) is ethylene at a temperature of from 50 DEG  C. to 160 DEG  C. at a reaction pressure of 100 p.s.i.g. to 10,000 p.s.i.g.  Terpolymers exemplified are those in which component (3) is bis (2-chloroethyl) vinyl phosphonate, t-butyl methacrylate, dineopentyl vinyl phosphonate, dimethyl allyl phosphonate, acrylic acid and component (2) is ethylene; those in which component (2) is isobutylene and component (3) is acrylic acid, methacrylic acid, 3-methylene cyclobutane carboxylic acid, t-butyl acrylate, bis (2-chloroethyl) vinyl phosphonate, dimethyl allyl phosphonate, dineopentyl vinyl phosphonate, itaconic anhydride and itaconic acid.  Copolymers containing the fourth optional component are those where component (2) is ethylene, component (3) is bis (2-chloroethyl) vinyl phosphonate and component (4) is isobutylene, chlorotrifluoroethylene, vinyl butyrate, vinyl fluoride or CH2 = CHOCH(CF3)2, or those in which component (2) is isobutylene, component (3) is acrylic acid and component (4) is propylene, norbornene, 6 - methylene norbornene, vinyl fluoride, vinylidene fluoride or hexafluoropropylene. The copolymers are insoluble in common organic and inorganic solvents, but are all soluble or form fluid organosils in chloroform, trichloroethylene, sym-difluorotetrachloroethylene and tetrahydrofuran.  Coating compositions comprise solutions of the copolymers in trichloroethylene, which may also contain titanium dioxide.  Also exemplified are compositions which can be used as lead auto body solder; these comprise a tetrafluoroethylene/isobutylene/ acrylic acid terpolymer, atomized aluminium of average particle diameter 18 microns and barytes.ALSO:Substrates, particularly metals, e.g. aluminium but also wood, glass or films of synthetic polymers are coated with a copolymer of (a) tetrafluoroethylene (b) at least one aliphatic mono-olefin having a terminal ethylenically unsaturated group and (c) at least one polymerisable ethylenically unsaturated acid having an acidity constant of from 1.0 to 5.5 or a functional derivative thereof and optionally (d) a further polymerizable ethylenically unsaturated compound (see Division C3).  The copolymers are insoluble in common organic and inorganic solvents but are soluble in chlorinated and fluorinated solvents.  The copolymers may be applied to the substrate by melt-application techniques or by solvent casting methods.  Pigments e.g. titanium dioxide may be incorporated in the coating.