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| Stripping fingers for copying machine |
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Process for the shatterproof coating of glass surfaces
| Details |
Inventors: Wieczorrek, Wolfhart; Mennicken, Gerhard;
Assignee: Bayer Aktiengesellschaft (Bayerwerk, DE)
Primary Examiner: Lusignan; Michael R.
Assistant Examiner: Page; Thurman K.
Attorney, Agent or Firm: Harsh; Gene, Pope; Lawrence S., Roy; Thomas W.
The invention relates to a new process for the shatterproof coating of glass surfaces by coating the surfaces with a coating composition based on a two-component system reacting fully to form a polyurethane, the glass surfaces to be coated being coated before application of the coating composition with a physically drying priming lacquer containing a silane adhesion promoter and a catalyst which accelerates hardening of the coating composition and, as binder, a polyurethane polyurea which has a linear molecular structure and which is soluble in lacquer solvents. |
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DETAILED DESCRIPTION OF THE INVENTION The priming lacquer used in the process according to the invention comprises four components, namely: (a) a suitable solvent or solvent mixture, (b) an elastomeric polyurethane polyurea which has a substantially linear molecular structure, which is soluble in the solvent, and which is used in a quantity of from about 5 to 25% by weight, based on the total weight of the priming lacquer, (c) a silane adhesion promoter which is generally used in a quantity of from about 0.
2 to 3% by weight, based on the total weight of the priming lacquer and (d) at least one catalyst which accelerates the isocyanate addition reaction responsible for the hardening of the coating composition and which is used in a total quantity of from about 0.
2 to 2% by weight, based on the total weight of the priming lacquer.
Suitable solvents (a) are the usual lacquer solvents such as, for example, ethyl acetate, butyl acetate, methyl glycol acetate, ethyl glycol acetate, toluene, xylene and/or alcohols, such as ethanol or isopropanol.
Suitable polyurethane polyureas (b) are, in particular, those based on (i) aliphatic or cycloaliphatic diisocyanates, (ii) polyester diols having a molecular weight in the range from about 1000 to 2500 and (iii) aliphatic or cyloaliphatic diprimary diamines.
The isocyanate component (i) consists of an aliphatic or cycloaliphatic diisocyanate having a molecular weight in the range from about 168 to 300, of the type known per se in polyurethane chemistry.
Examples of suitable diisocyanates are hexamethylene diisocyanate, 4,4'-diisocyanato-dicyclohexyl methane or 1-isocyanato-3,3,5-trimethyl-5-isocyanato-methyl cyclohexane (isophorone diisocyanate or IPDI).
IPDI is particularly preferred.
The polyester diols are preferably polyester diols having a molecular weight in the range from about 1000 to 2500 and, more particularly, in the range from about 2100 to 2400, of the type obtained by reacting dicarboxylic acids, such as succinic acid, adipic acid or suberic acid, with a stoichiometric excess of simple glycols, such as ethylene glycol, 1,4-dihydroxybutane and/or 1,6-dihydroxyhexane
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Manufacturing Materials 
