Use of water-based carbonyl-functional polymers on a cross-linker-free highperformance leather finish
The present paper aims to study a new high-performance coating formulation while avoiding the use of cross-linkers. 
By using acrylic polymers with carbonyl functional groups, the negative environmental effects of the finishing process can be minimized. These new polymers can give very good physical properties without losing the inherent properties 
of flexibility and elasticity needed in upholstery leather
Cross-linked Polymers for Aqueous Finishing. Binders Crosslinked with Polyaziridine: Part I Polyurethane
Aqueous finishing emerges as an alternative to solvent based finishes, which have to be limited due to their toxicity, negative effects on the environment and in terms of safety. It is necessary, in order to be able to introduce aqueous systems progressively, to use cross-linkers that react with polymers. Otherwise, it is not possible to obtain the physical properties required for most leather goods. The present study aims to look into the behaviour of polyurethane binders cross-linked with polyaziridine: the amount of cross-linker used, the type of polymer employed, the type of tannage and retannage effected and the evolution of the reaction over time. A comparison of results shows that the type of tannage and retannage, as well as the physical characteristics of the polyurethane used are influential factors in the behaviour of polyurethane binders cross-linked with polyaziridine. Different amounts of polyaziridine are needed with regard to the type of tannage and retannage effected and to the physical characteristics of the polyurethane used.
Curing of paint films with film-penetrative crosslinker at ambient temperature
The study deals with a method for curing paint films at ambient temperatures with a film-penetrative crosslinker without heating. The method is based on the phenomenon that when a wet paint film turns into the thermoplastic state, it is dipped in a solution of a crosslinker, the crosslinker penetrates and it can be cured with time. Here diacetone acrylamide copolymers were employed as a matrix resin and carbohydrazide as a film-penetrative crosslinker. As a result, it was found that (1) the penetrating rate had a close relationship to film curing speed, (2) the rate was accelerated with increase in the content of organic solvent in the crosslinker solution, with increase in the compatibility between the solvent and the resin, and with rising dipping temperature, and (3) the curing speed rose with acids in the reaction system. If the method is set up technically and properly engineered, industrial paints can be cured practically without bulky heating devices for hardening paint film.