Patent GB-1000434-A (GB)
Title: Process for the vulcanization of textile material with saturated copolymers of olefines
IPC: C08F8/30
Filed: 1962-04-05
Abstract: Copolymers of ethene and propene and/or butene-1 are modified to render them capable of reacting with isocyanates either by heating them in an inert organic solvent, e.g. benzene, chlorobenzene or gasoline, with an organic peroxy compound, e.g. ditertiary butyl peroxide, dicumyl peroxide, dibenzoyl peroxide, tertiary butyl perbenzoate, cumyl hydroperoxide or tertiary butyl hydroperoxide, and acrylamide, methacrylamide or N-methylol acrylamide for 1-72 hours at a temperature above 50 DEG  C. to produce a graft copolymer, or by heating them with an organic peroxy compound, preferably in the presence of an aldehyde, e.g. formaldehyde, in an inert organic solvent for 1-72 hours at a temperature above 50 DEG  C.ALSO:Textile materials, e.g. fibres, cords and fabrics made from natural or regenerated cellulose, silk, wool, polyamides or polyesters, are treated with a di- or poly-isocyanate and with a copolymer of ethene and propene and or butene-1 which is modified to render it capable of reacting with an isocyanate, and are then vulcanized into a mixture containing an amorphous copolymer of ethene and propene and/or butene-1 as rubber constituent. Suitable modified copolymers are those prepared by heating a copolymer of ethene and propene and/or butene-1 in an inert organic solvent, e.g. benzene, chlorobenzene or gasoline, with an organic peroxy compound, e.g. a dialkyl peroxide such as ditertiary butyl peroxide and dicumyl peroxide, diacyl peroxide such as dibenzoyl peroxide, per acid ester such as tertiary butyl perbenzoate or hydroperoxide such as cumyl hydroperoxide or tertiary butyl hydroperoxide, and a compound containing in addition to a reactive double bond, other functional groups, e.g. OH-, NH=, NH2- or -NH-CH2OH groups or a further reactive carbon-carbon double bond, e.g. acrylamide, methacrylamide and N-methylol acrylamide, for 1-72 hours at temperatures above 50 DEG C.  Alternatively modified copolymers prepared by heating copolymers of ethene and propene and/or butene-1 with an organic peroxy compound preferably in the presence of an aldehyde in an inert organic solvent for 1-72 hours at a temperature above 50 DEG C may be used.  The textile materials may be dipped into a solution containing 0.5-10% by weight of the modified copolymer and 0.1-20% by weight of a di-or poly-isocyanate, e.g. methane-tri-(phenyl-isocyanate-4), 2, 4-toluylene diisocyanate, hexamethylene diisocyanate or naphthalene diisocyanate, in an organic solvent, e.g. aliphatic, cycloaliphatic and aromatic hydrocarbons and halogenated hydrocarbons, and then dried in dry air or under reduced pressure or the textile material may be dipped first into a solution containing 0.1-20% by weight of the di- or poly-isocyanate and then into a solution containing 0,5-10% by weight of the modified copolymer prior to drying.  The treated textile materials may then be incorporated into mixtures containing amorphous copolymers of ethene and propene and/or butene-1 containing vulcanization agents, e.g. dicumyl peroxide, tertiary butyl cumyl peroxide, ditertiary butyl peroxide, 2, 5-dimethyl-2, 5-bis(tertiary butyl peroxy hexane, sulphur and/or unsaturated monomers such as maleic anhydride and divinyl adipate, rubber fillers, e.g. carbon black and silica, and plasticizers, e.g. paraffinic and naphthenic oils.