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Aqueous coating compound, a process for its preparation and its use in processes for multilayered lacquering

  • US 5,342,882 A
  • Filed: 07/22/1993
  • Issued: 08/30/1994
  • Est. Priority Date: 07/25/1992
  • Status: Expired due to Term
First Claim
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1. An aqueous coating composition, containing a binder which comprises(I) from 60% to 100% wt. of a mixture of(i) from 5% to 95% wt. solids basis based on(I) of an aqueous dispersion of one or more self-emulsifying polyurethane resins having a number average molecular weight of from 30,000 to 300,000 and containing carboxyl groups corresponding to an acid number of from 5 to 50, said resins having been obtained by chain lengthening in water a water-dispersible polyurethane prepolymer having more than one free isocyanate group per molecule, and(ii) from 95% to 5% wt. solids basis based on (I) of an aqueous dispersion of at least one acrylated polyester, or at least one acrylated polyurethane, or at least one acrylated polyester and at least one acrylated polyurethane, and(II) from 0 to 40% wt. of one or more formaldehyde condensation resin, one or more blocked polyisocyanate, or one or more formaldehyde condensation resin and one or more blocked polyisocyanate.

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