| 摘要 |
The adhesion of fibrous material to butyl rubber is improved by treating the fibrous material, before adhering it to the rubber, with an aqueous dispersion of butyl rubber latex and a phenolaldehyde resin, the dispersion having a pH between 7.5 and 9. Specified fibrous materials are yarns, cords or fabrics of cotton, silk, ramie, rayon, nylon and glass fibres. The aqueous dispersion may also contain protective agents and emulsifiers.ALSO:A butyl rubber latex, used for treating fibrous material before adhering it to rubber, comprises an aqueous dispersion of a butyl rubber latex and a phenol-aldehyde resin the pH of the dispersion being between 7.5 and 9. Specified butyl rubbers are copolymers of a major proportion of isobutylene with butadiene, isoprene, dimethyl butadiene, dimethallyl, myrcene and allocymene, and specified resins are those of resorcinol with formaldehyde. The aqueous dispersion preferably contains 10-20 per cent of latex solids 1-10 per cent of both phenol and a 37 per cent solution of formaldehyde and minor proportions of protective agents, e.g. polyvinyl alcohol and emulsifiers, e.g. polyalkenated alkyl phenols or alcohols or the sodium salts of their sulphonates, sodium lauryl sulphate, sodium oleyl taurate, the alkyl-, diisobutyl phenoxyethoxyethyl-, and dimethyl phenoxy-ethoxy-ethyl-, dimethyl benzyl ammonium chlorides and sodium or potassium oleate or stearate. |
