PROCESS FOR COATING A SUBSTRATE WITH A SILICON AND ZIRCONIUM BASED LACQUER

摘要

PCT No. PCT/EP93/01427 Sec. 371 Date Feb. 15, 1995 Sec. 102(e) Date Feb. 15, 1995 PCT Filed Jun. 5, 1993 PCT Pub. No. WO93/25605 PCT Pub. Date Dec. 23, 1993The present invention relates to a lacquer obtained by the process comprising the steps of: (i) precondensation of: a) 1 to 10 mol % of at least one zirconium compound of the formula ZrR4; b) 20 to 94 mol % of at least one organic silane of the formula R''m(R'''Y)nSiX(4-m-n); c) 5 to 30 mol % of at least one organic silane of the formula R''pSiX4-p; d) optionally 0 to 10 mol % of at least one low-volatility metal oxide; and (ii) hydrolysis condensation of the precondensate of step (i) in the presence of 0 to 50% of the stoichiometric amount of water. The invention also relates to a process for the obtention of a coating on substrate which comprises the steps of applying the lacquer and curing same. The invention also relates to the thus-coated substrates.