Process for the preparation of highly elastic plastics

Details Process for the preparation of highly elastic plastics Process for the preparation of highly elastic plastics

C - Chemistry, Metallurgy

08

G

402/133, 260/455

C08G 18/12 (2006.01) C07C 273/18 (2006.01) C07C 275/62 (2006.01) C08G 18/70 (2006.01) C08G 18/78 (2006.01) C08G 18/80 (2006.01)

Patent

CA 2019434

Mo-3424 LeA 26,984 A PROCESS FOR THE PREPARATION OF HIGHLY ELASTIC PLASTICS ABSTRACT OF THE DISCLOSURE The present invention relates to a process for the preparation of a modified 1,5-naphthylene diisocyanate containing urea and biuret groups comprising reacting (a) 1,5-naphthylene diisocyanate iin molten form with (b) a mixture comprising about 0.02 to about 0.5 mole of water per mole of 1,5-naphthylene diisocyanate and about 1 to about 10 parts for each part of water of an organic solvent. The present invention further relates to a process for the preparation of elastomeric moldings comprising reacting by the one-shot or prepolymer process at an isocyanate index of 70 to 130 a modified 1,5-naphthylene diisocyanate containing urea and biuret groups with compounds containing at least two isocyanate-reactive groups and having a molecular weight in the range from about 500 to about 10,000 and, optionally, organic compounds containing isocyanate-reactive groups and having a molecular weight in the range from 60 to 499. Le A 26 984

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