Reactive adhesive, multilayer film, and packaging

• Main Authors: Tanabe, Hideo, Nitta, Shuuichi, Umetsu, Kiyokazu
• Format: Patent
• Language: English
• Published: 19.12.2019
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; DYES; HANDLING THIN OR FILAMENTARY MATERIAL; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PAINTS; PERFORMING OPERATIONS; POLISHES; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS AS ADHESIVES

Provided is a reactive adhesive which comprises a polyol component A containing a polyol compound and an isocyanate component B containing an isocyanate compound, and wherein: the isocyanate component B contains a reaction product (B-1) of a polyol and an isocyanate and a reactive diluent (B-2) having an isocyanate group that has a number average molecular weight within the range of 400-1,000; and the viscosity as determined by blending the polyol component A and the isocyanate component B at the weight ratio and leaving the resulting blend to stand for 30 minutes in an atmosphere at 40°C is 5,000 mPa·s or less. Also provided are a multilayer film and a package. It is preferable that the reactive diluent (B-2) having an isocyanate group is an aromatic diisocyanate, an aliphatic diisocyanate, or a dimer or trimer of one of these diisocyanates.