| 摘要 |
Organic Diazocompounds that can be employed in the manufacturing of PVC/Polyisocyanates based, foamed articles, and a process for the production of objects made of rigid, expanded polymer materials mainly based on PVC and Polyisocyanates include the use as cell nucleation agents, of alternative organic, free N2 gas releasing Diazocompounds, displaying, either as such and as far as their decomposition products is concerned, much lower hazards for humans and environment respect to currently used Diazocompounds. A method for obtaining the optimum dispersion of the gas releasing compounds to get the desired microsize “embryos” in the early stages of foam development is based on the capability of used Polyisocyanates and of some liquid, acid organic Anhydrides to dissolve Diazocompounds in the amounts demanded by the subject process. There is also new employment as cell nucleation agent in the subject process of the chemical compound named 2,2′-Azobis(2-methylbutanenitrile) (AMBN). |
