POLYURETHANE ADHESIVES WHICH FORM BONDS OF IMMEDIATE HIGH STRENGTH

• Main Authors: DOLLHAUSEN M, BOCK E
• Format: Patent
• Language: English
• Published: 22.05.1973
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; 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; PAINTS; PERFORMING OPERATIONS; POLISHES; PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCESIN A PLASTIC STATE; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

A method of providing bonded materials having a high resistance to separation immediately after bonding at room and at elevated temperatures using a hydroxyl polyurethane adhesive having a molecular weight of at least 50,000 prepared from organic diisocyanate, hydroxyl polyesters having a molecular weight of from 2,000 to 10,000 and 0.1 to 0.7 mol per mol of polyester of an alkane diol having at least four carbon atoms in the molecule. A solvent solution of the adhesive is applied to at least one of the surfaces of the articles to be bonded together and heated to a temperature of at least 70 DEG C. to both activate the adhesive and evaporate the solvent. Immediately following the heat treatment the surfaces are pressed together forming an immediate high strength bond which is highly resistant to separation.