Process for the production of tires comprising vulcanized elastomers containing urethane groups

A process for the production of vulcanized elastomers containing urethane groups by casting, comprising:

• (A) mixing the following components:
• (1) liquid diene polymers containing isocyanate reactive functional groups, having an average functionality of 2 to 3 and an average molecular weight of from 500 to 30,000,
• (2) compounds having molecular weights of from 400 to 10,000, and containing at least two hydroxyl groups,
• (3) polyisocyanates,
• (4) 3 to 30% by weight, based on 100 parts by weight of components (1)+(2), cross-linking agents having molecular weights of from 32 to 400 and containing at least two active hydrogen atoms,
• (5) vulcanization agents used for vulcanization and optionally
• (6) reinforcing fillers;
• and subsequently
• (B) pouring the mixture into a mold and allowing the mixture to react in the mold;
• and subsequently removing the molded product and
• (C) vulcanizing outside the mold at temperatures above 120.degree. C.