Patent GB-1020757-A (GB)
Title: Process for the adhesive bonding of olefin copolymers to synthetic and natural fibres
IPC: D06M15/693
Filed: 1962-09-20
Abstract: Ethylene - alpha - olefin copolymers are grafted with maleic acid or anhydride by mixing the ethylene-alpha-olefin copolymer with maleic acid or anhydride in the presence of an organic peroxide, e.g. tetrachlorinated tert.-butyl peroxide, at 150-200 DEG  C.  After grafting the copolymer may be reacted with an organic polyisocyanate, e.g. 1,6-hexane diisocyanate, 2,4- or 2,6-toluene-diisocyanate, diphenyl-methane diisocyanate, triphenylmethane triisocyanare or 1-chloro-phenylene-2,4-diisocyanate.  The grafted polymers may be used in the bonding of ethylene-alpha-olefin copolymers to natural and synthetic fibrous materials.ALSO:Natural and synthetic fibres, e.g. cotton, viscose rayon and nylon, are bonded to saturated amorphous ethylene-alpha olefin copolymers by treating them with a phenol-formaldehyde resin or an organic polyisocyanate, drying, applying a chlorosulphanated ethylene-alpha-olefin copolymer, an ethylene-alpha-olefin copolymer grafted with maleic acid or anhydride or the reaction product of an organic polyisocyanate with an ethylene-alpha-olefin copolymer grafted with maleic acid or anhydride or reagents such that either of the latter two modified copolymers is produced in situ during subsequent vulcanization, applying an ethylene-alpha-olefin copolymer containing an organic peroxide and sulphur as a vulcanizing agent, and vulcanizing by heating at 110 DEG -220 DEG C., the first application of resin or polyisocyanate and subsequent drying being unnecessary if the second application includes polyisocyanate.  The copolymers used may be ethylene-propylene or ethylene-butene-1 copolymers having molecular weights of 60,000-800,000 and an ethylene molar content of 10-80%. Suitable organic polyisocyanates are 1,6-hexane diisocyanate, 2,4 or 2,6-toluene-disocyanate, diphenyl methane diisocyanate, triphenylmethane triisocyanate and 1-chloro-phenylene-2,4-diisocyanate and suitable organic peroxides are di-tert-alkyl peroxides which may be chlorinated, tert, diaralkyl, tert alkyl and aralkyl peroxides the sulphochlorinated copolymer preferably contains 0.05-5% by weight of sulphur and 1-40% by weight of chlorine.  The fibres treated may be in the form of cords or fabrics and may subsequently be used for making tyres and conveyer belts.ALSO:Fabrics made from natural or synthetic fibres, e.g. cotton, nylon or viscose rayon, are treated with a phenol-formaldehyde p  resin or an organic polyisocyanate, dried, coated with a chlorosulphonated ethylene-alpha-olefin copolymer, an ethylene-alpha-olefin copolymer grafted with maleic acid or anhydride or the reaction product of an organic polyisocyanate with an ethylene-alpha-olefin copolymer grafted with maleic acid or anhydride or reagents such that either of the latter two modified copolymers is produced in situ during subsequent vulcanization, coated with an ethylene-alpha-olefin copolymer containing an organic peroxide and sulphur as a vulcanizing agent and vulcanized by heating at 110-220 DEG C., the first application of resin or polyisocyanate and the subsequent drying being unnecessary if the second application includes polyisocyanate. The copolymers used may be ethylene-propylene or ethylene-butene-1 copolymers having molecular weights of 60,000-800,000 and an ethylene molar content of 10-80%. Suitable organic polyisocyanates are 1,6-hexane diisocyanate, 2,4- or 2,6- toluene diisocyanate, diphenyl methane diisocyanate, triphenylmethane triisocyanate and 1-chloro-phenylene-2,4-diisocyanate and suitable organic peroxides are di-tert. alkyl peroxides which may be chlorinated, tert. diaralkyl, tert. alkyl and aralkyl peroxides.  The sulphochlorinated copolymer preferably contains 0,05-5% by weight of sulphur and 1-40% by weight of chlorine.  Layers of fabric may be bonded together in the production of tyres and conveyer belts made from the ethylene-alpha-olefin copolymers.