Verfahren zum Beschichten von Glaskoerpern

A process for coating glass substrates with a hard polymer layer to increase the fracture resistance, in which the polymer layer is formed by polymerisation of a gaseous hydrocarbon monomer (I) in a corona discharge. Pref. (I) is a hydrocarbon monomer with double or triple C/C bonds, pref. acetylene. The polymer layer obtd. is 1-10 microns thick. This layer may be coated with an oxide layer, pref. with a thickness of 0.1-5 microns, obtd. by the action of a corona discharge or a flame on a gaseous organometallic or organometalloid monomer (II) in presence of oxygen. Pref. (II) is an organo-Si monomer, esp. pref. Me4Si or Me3Si-O-SiMe3. Pref. substrates are hollow glass prods., which are coated on-line after their prodn.. The corona discharge is operated at a frequency of 35-50 kHz. USE - For coating glass to prevent fracture, esp. e.g. to prevent glass bottles cracking during the cooling phase in prodn. ADVANTAGE - A simple polymer coating process which avoids the use of organic or inor ganic solvents