GB585664A - A non-drying adhesive composition - Google Patents

Abstract

A non-drying adhesive is prepared by mixing a resinous material with a sticky, stretchable polyester produced by reacting a dihydric alcohol with a dimer of a fatty acid containing two or more double bonds. The resinous material may be rosin, dammar, copal, kauri, manila, coumarone resin, ester gum, a terpene resin, hydrogenated rosin, balata resin, a phenol-formaldehyde resin, a rosin-maleic acid condensate, an alkyd resin, acrylic acid resin, chlorinated diphenyl, or a resinous rubber derivative. Suitable fatty acids from which the dimers may be made are arachidonic, linoleic, or clupanodonic. Zinc oxide, fillers and plasticisers may be incorporated in the compositions. The ingredients may be dissolved by stirring in a common solvent, or the resin may be added to the molten polyester or the polyester to the molten resin and the cooled solid dissolved, or the two products may be blended by heating together and the mixture dissolved. The adhesive may be applied to sheet material, or used for sealing bags or for making laminated materials, e.g. from rubber hydrochloride, "Cellophane" (Registered Trade Mark), cellulose acetate, nylon, ethyl cellulose, polyvinyl alcohol, "Vinylite" (Registered Trade Mark), cellulose acetobutyrate, aluminium, lead, copper or tin foil, paper, waxed paper, or glassine, the laminations being of the same or different materials. Gasoline is a preferred solvent when using rubber hydrochloride. For coating cellophane, toluol is a preferred solvent, if desired with a small amount of ethyl acetate added, or a mixture of gasoline and ethyl acetate may be used. Examples describe adhesive compositions containing a polyester known as glycol polyester produced from ethylene glycol and a dimerised fatty acid in admixture with (1) hydrogenated rosin and a textile spirits which is a gasoline fraction; (2) "Cumar R.3" (Registered Trade Mark) and textile spirits; (3) ester gum and textile spirits; (4) a polymerized terpene known as Piccolyte S.100 and textile spirits; (5) balata resin and textile spirits; (6) rosin and toluol; and (7) a rubber derivative such as "Pliolite," "Porlon" or "Marlon" (Registered Trade Marks) and toluol. The dimerised acid may be prepared as described in p Industrial and Engineering Chemistry, Jan., 1941 (Vol. 33), p. 86. The Specification as open to inspection under Sect. 91 describes also use of polyesters prepared from trimerised fatty acids. This subject-matter does not appear in the Specification as accepted.