Nonisocyanate polyurethanes for adhesives and coatings

Abstract

Polyurethane adhesives and coatings are widely used in Microelectronics and Photonics. The novel matrix of advanced nonisocyanate polyurethane (NIPU) coatings and adhesives are formed from two oligomers, one of them contains terminated cyclocarbonate groups (CC-oligomer), second terminated primary amines groups. As a result of forming an intramolecular bond and blockage of carbonyl oxygen it is considerably lowers the susceptibility of the whole urethane group to hydrolysis. We have elaborated a few technologies for the synthesis of CC-oligomers with different structures that give us possibility for preparing coatings from high elastic to very hard. By the data of IR-spectroscopy investigation the process of curing different CC-oligomers and primary amine oligomers was studied and give us all the needed information for many coating compositions' preparing according a lot of requests for a wide spectrum of industrial, decorative and another types of coatings. The chemical resistance and permeability of hybrid nonisocyanate polyurethane (HNIPU) coatings is 1.5-2.5 times better in comparison with conventional polyurethane coatings of the similar structure without the intermolecular hydrogen bond. Corrosive passive adhesives were prepared by a new method of their synthesis the method of multiplication. In the report will present the data of their testing by ASTM, DIN and BS. At the end of 2001 the industrial production of different nonisocyanate polyurethane systems for coating, adhesives and sealant will be established in the USA.