| 摘要 |
<p>1531413 Laminates DR KURT HERBERTS & CO GmbH 27 Oct 1975 [4 Nov 1974] 44062/75 Heading B5N Foils are bonded together by coating at a speed greater than 50 m./min. at least one of the foil sides with a reaction product of a hydroxyfunctional polyether and/or polyester and a polyiso (thio) cyanate, the reaction product containing free-NCO and/or -NCS groups, being capable of reacting with reactive hydrogencontaining compounds, having an average molecular weight of 500-10,000, having a -NCO and/or -NCS group content of 1-10% by weight, being substantially solvent-free when applied and having a viscosity of at most 60 P as under application conditions, adjusting the temperature at which the reaction product is applied to a temperature which is not more than 140‹ C. and which is not so far below the temperature of the ambient air so that water in the air will be condensed in the reaction product to be applied which would result in the pot-life of the reaction product dropping below the value required for implementation of the method and subsequently laminating the foils. The foils may be of cellulose derivatives, paper, polyolefins, polyesters, polyamides, tin or aluminium, which may have been surface treated by flaming or corona discharge or coated with polyvinylidene chloride. 0À1-10 g./m.<SP>2</SP> of coating may be applied to the foils. The reaction product may contain a co-polymerized polyamine, aminoalcohol or polyol in an amount of not more than 30% by weight. The coating mixture may also contain accelerators, e.g. tertiary amines or metal-organic compounds such as dibutyl tin dilaurate, lubricants, dyes, pigments fillers, thermoplastic resins or plasticizers. The reaction product may have a reactivity of at most 5 hours as determined by a test, details of which are given. The adhesive may be applied by means of rollers and the foils pressed together by means of rollers.</p> |
