Patent GB-611825-A (GB)
Title: Process for attaching threads, tissues, and the like of cellulose in native or regenerated condition to rubber
IPC: C08J5/06
Filed: 1946-05-09
Abstract: Mono- or di-methylol derivatives of o- or p-mono- or di-substituted phenols or their salts are prepared by reacting 1 or 2 mols. of formaldehyde with 1 mol. of o- or p-disubstituted phenol or o- or p-monosubstituted phenol respectively in the presence of 1 mol. of sodium hydroxide at room temperature.  The sodium salt crystallizes out and is converted to the alcohol by reacting it with acetic acid. Dimethylol-p-cresol is a specified product.  The compounds are employed in processes for effecting the adhesion of threads, tissues and the like of cellulose to rubber (see Groups IV (c) and V).ALSO:<FORM:0611825/IV (c)/1> In a process for effecting the adhesion of threads, tissues and the like of natural or regenerated cellulose to rubber, the cellulose is impregnated with a solution of either (a) a di-alcohol of an o- or p-mono-substituted phenol, (b) a mono-alcohol of an o- or p-disubstituted phenol or (c) a salt of one of the above alcohols, after which the excess solution is removed, the cellulose product is applied to the rubber and the combination is heated to effect the bonding.  The di-alcohol or its sodium salt is preferred since it has two available OH groups (Fig. 5), one of which can react with the rubber and the other with the cellulose.  The alcohol may be isolated or applied to the cellulose in the liquid in which it is produced.  In an example, a viscose tissue is immersed in a 2 1/2 per cent solution of dimethylol-p-cresol at 75 DEG  C., centrifuged and dried.  The product is laid upon plates of unvulcanized rubber mixed with vulcanization reagents and heated at 150 DEG  C. for 10 mins. to effect vulcanization.  The phenol-alcohols referred to are prepared by reacting 1 or 2 mols. of formaldehyde with 1 mol. of o- or p-disubstituted phenol or o- or p-monosubstituted phenol respectively in the presence of 1 mol. of sodium hydroxide at room temperature.  The sodium salt crystallises out, and is converted to the alcohol by reacting it with acetic acid.ALSO:In a process for effecting the adhesion of threads, tissues and the like of natural or regenerated cellulose to rubber, the cellulose is impregnated with a solution of either (a) a di-alcohol of an o- or p-monosubstituted phenol, (b) a mono-alcohol of a di-substituted phenol or (c) a salt of one of the above alcohols, after which the excess solution is removed, the cellulose product is applied to the rubber and the combination heated to effect the bonding.  The di-alcohol or its sodium salt is preferred since it has two available OH groups, one of which can react with the rubber and the other with the cellulose.  The alcohol may be isolated or applied to the cellulose in the liquid in which it is produced.  In an example a viscose tissue is immersed in a 2 1/2 per cent solution of dimethyldi-p-cresol at 75 deg. C, centrifuged and dried.  The product is laid upon plates of unvulcanized rubber mixed with vulcanization reagents and heated at 150 deg. C. for 10 minutes to effect vulcanization and bonding.