Patent ID: 6096394
Filing Date: 2000-08-01
Classification: C03C,Y10T

Abstract:
A process for producing surface-sealed hollow glass containers, where as part of the production process the hollow glass containers in the region of the exit from the annealing lehr, which is arranged following a machine for producing hollow glass containers, are coated with a water-based cold end coating composition comprising a trialkoxysilane, a dialkoxysilane and/or a tetraalkoxysilane and/or the hydrolysis and/or condensation products thereof,which comprisessubsequently applying to this first coat a second coat of a water-based cold end coating composition that comprises the following components:I. a water-based organopolysiloxane-containing composition prepared froma) Q moles of functional group-bearing alkoxysilanes of the general formul aA--Si(R.sup.1).sub.y (OR*).sub.3-yandb) M moles of alkoxysilanes selected from.alpha.) trialkoxysilanes of the general formulaR.sup.2 --Si(OR**).sub.3 IIand/or.beta.) dialkoxysilanes of the general formulaR.sup.3 R.sup.4 Si(OR***).sub.2 IIIand/or.gamma.) tetraalkoxysilanes of the general formulaSi(OR****).sub.4 IV,where A is a substituent possessing at least one amino, alkylamino, dialkylamino, amido, epoxy, acryloxy, methacryloxy, cyano, isocyanato, ureido, thiocyanato, mercapto, sulfane or halogen group which is attached directly or via an aliphatic or aromatic hydrocarbon radical to silicon,R.sup.1 =methyl, ethyl or A (as defined above),y=0 or 1,R*, R**, R*** and R**** independently of one another are an alkyl group having 1 to 8 carbon atoms or a corresponding alkyl group that is substituted by an alkyl((poly)ethylene glycol) radical,R.sup.2, R.sup.3 and R.sup.4 independently of one another are an alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkcnyl or aromatic group having in each case not more than 18 carbon atoms, or a group of this kind which is partially fluorinated, perfluorinated and/or substituted by alkoxy and/or by aryloxy groups,in a molar ratio 0.ltoreq.M/Q.ltoreq.20, andII. a silicon-free component selected froma) a wax and/orb) a partial fatty acid ester and/orc) a fatty acid and/ord) a surfactant;and additionally wherein the water-based cold end coating composition of the second coat has a dry-matter content of from 0.1 to 10% by weight and, based on dry matter, the weight ratio of the organopolysiloxane-containing composition (component I) to the silicon-free component II is from 0.05:1 to 20:1, wherein in the mixture of the silanes I to IV there are on average per silicon atom at least 2.4 alkoxy groups OR*, OR**, OR*** and/or OR****.