Patent GB-585060-A (GB)
Title: Improvements in or relating to heat-convertible adhesive compositions and applications thereof
IPC: C08L15/00
Filed: 1944-09-11
Abstract: A heat-convertible adhesive composition comprises a blend of a cyclised rubber and a heat-convertible phenol-aldehyde resol, these ingredients being in solution in an organic solvent and the cyclised rubber forming from 25-90 per cent of the two aforesaid ingredients. For the preparation of the cyclised rubber see Group V.  The phenol-aldehyde resol may be obtained by reacting formaldehyde, paraformaldehyde, hexamethylene tetramine, 1 : 3 : 5-trioxane, acetaldehyde, butyraldehyde, chloral, furfural or benzaldehyde with a phenol such as phenol, o-, m-, p-cresol, the xylenols, tertiary-butyl phenol, a -, b -naphthol, chloro-and amino-phenols, hydroquinone, catechol, pyrogallol, phloroglucinol or orcinol.  A preferred resol is obtained by reacting paraformaldehyde in n-butanol containing potassium hydroxide with resorcinol, phosphoric acid in ethanol being added to the mixture. p  The cyclised rubber and the resol are preferably blended in organic solution in the presence of caustic soda or hexamethylene tetramine.  Carbon black, pigments, fillers, vulcanizing agents and antioxidants may also be added.  Specification 544,944, [Group V], is referred to.ALSO:A heat-convertible adhesive composition especially suitable for binding natural and synthetic rubbers to rayon, cotton, nylon and metals comprises a blend of a cyclized rubber and a heat-convertible phenol aldehyde resol, these ingredients being in solution in an organic solvent and the cyclized rubber forming from 25-90 per cent. of the total weight of the two aforesaid ingredients.  The cyclized rubber may be that known under the Registered Trade Mark of "Pliolite" and is preferably prepared either by the action of sulphuric acid and a phenol on rubber dissolved in xylene followed by neutralisation with ethanolamine, or by the action of tin tetrachloride, aluminium chloride, ferric chloride, chromic chloride or another halide of an amphoteric metal on rubber, isolation being effected by pouring the mass into water, acetone, or methyl or ethyl alcohol.  The phenol aldehyde resol may be obtained by reacting formaldehyde, paraformaldehyde, hexamethylene tetramine, 1 : 3 : 5-trioxane, acetaldehyde, butyraldehyde, chloral, furfural or benzoldehyde with a phenol such as phenol, o-, m-, pcresol, the xylenols, tertiary-butyl phenol, a -, b -naphthol, chloro- and amino - phenols, hydroquinone, catechol, pyrogallol, phloroglucinol, or orcinol. The cyclized rubber and the resol are preferably blended in organic solutions in the presence of caustic soda or hexamethylene tetramine.  Carbon black, pigments, fillers, vulcanizing agents and antioxidants may also be added.  Other materials which may be bonded by the adhesive include cellulose acetate, polymers of vinyl and vinylidene compounds, silk, wool and casein, particularly when the material is in the form of a film.  In addition the adhesive may be used to bond metals such as steel, tin and aluminium to natural and synthetic rubber, wood, metals and textiles and also wood to textiles and to wood. Specification 544,944 is referred to.