Patent GB-1415754-A (GB)
Title: Adhesive compositions
IPC: C08G8/08
Filed: 1973-01-25
Abstract: 1415754 Adhesive compositions MONSANTO CO 25 Jan 1973 [26 Jan 1972 (2)] 3954/73 Addition to 1365558 Headings C3R and C3P [Also in Division D1] An aqueous alkaline solution of at least 5% wt. solids of adhesive for bonding fibre to rubber comprises an aldehyde conjoint condensate of a mixture of resorcinol and an essentially saturated resorcinol polymer, the polymer being the reaction product of resorcinol and a C 3 -C 10  olefin which is a mono- or di-halo-olefin, an acyclic diolefin, a cyclic diolefin or an olefinic alcohol or an olefinic alcohol precursor, the molar ratio of olefin to resorcinol used being from 0À1-0À6 : 1, the aldehyde being selected from saturated aliphatic C 1 -C 6  aldehydes having straight or branched chains, paraformaldehyde and paraldehyde, the molar ratio of aldehyde to resorcinol used being from 0À2- 0À7 : 1 when the olefin is the olefinic alcohol or precursor thereof or from 0À2 to less than 0À3 : 1 or from more than 0À5 to 0À7 : 1 when the olefin is the mono- or di-haloolefin or the acrylic or cyclic diolefin, the reaction being, at least during the final stages carried out under acidic conditions. The aldehyde is preferably formaldhyde ; and the olefin may be allyl acetate or allyl ether. In an embodiment an adhesive composition comprises a latex of a diene rubber, a water soluble metal primer which is an aldehyde condensate of a monohydric phenol, a dihydric phenol or an alkylated mono- or dihydric phenol and the aldehyde conjoint condensate as described above the molar ratio of aldehyde to resorcinol used in making the conjoint condensate being from 0À2-0À7 : 1. A preferred adhesive composition has a total solids content of 20-40% wt. comprising 30- 75% wt. solids of rubber, 15-45% wt. metal primer, e.g. a phenol-HCHO condensate, and 20-60% wt. of the conjoint condensate. The above compositions can be used to treat fibres to give them an enhanced capacity to adhere to rubber. In an embodiment a fibre having an enhanced capacity to adhere to rubber is prepared by treating the fibre with a composition comprising an essentially saturated polymer obtained by reacting resorcinol and a C 3 -C 10  olefinic alcohol or precursor thereof, the molar ratio of olefin to resorcinol used being from 0À1- 2À0 : 1, and optionally with a butadiene/vinyl pyridine/styrene terpolymer latex. The fibres which may be treated by the above compositions include metal cord, polyester, nylon, rayon, wood cellulose, steel, brass-plated steel, debrassed steel and aluminium-steel alloy. In Examples 18-21 adhesives are prepared by condensing HCHO with the reaction product of resorcinol and allyl alcohol, allyl acetate or allyl ether, to which NH 4 OH is subsequently added. Polyester cords are dipped into acetone solutions of the resins and then into an RFL dip and the cords then bonded to rubber. Other adhesive formulations comprising vinylpyridine latex, water, phenol-formaldehyde resin, polymerized 1,2-dihydro 2,2,4-trimethyl quinoline and any one of the adhesives of examples 18- 21 are used to bond aluminium-steel alloy cord to rubber. Other adhesive formulations comprising resorcinol, water, aqueous HCHO, NaOH, polyvinylpyridine - styrene - butadiene latex and the adhesives of Examples 18-20 are used to bond polyester tire cord to rubber. The rubber in which the fibre is embedded comprises natural rubber, an oil-extended synthetic styrene-butadiene rubber, carbon black, stearic acid and zinc oxide.