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Sealing liquid for safety closures

  • US 8,951,382 B2
  • Filed: 09/23/2011
  • Issued: 02/10/2015
  • Est. Priority Date: 05/29/2006
  • Status: Expired due to Fees
First Claim
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1. A method of sealing a mailpiece, comprising:

  • providing a mailpiece envelope with a gummed flap;

    applying a sealing liquid to gumming on the flap or on an area of the mailpiece envelope opposite the gumming on the folded flap according to a defined laterally inhomogeneous pattern, the sealing liquid including water and a safety additive substantially not visible by immediate observation; and

    subsequently folding the flap and pressing the flap against an opposed surface of the mailpiece envelope;

    wherein the sealing liquid comprises;

    a) 80 to 98.9599 wt.-% water;

    b) 1.0 to 20 wt.-% penetration agent;

    c) 0.01 to 1.0 wt.-% wetting agent;

    d) 0.01 to 2.0 wt.-% stabilizer and/or buffer;

    e) 0.01 to 1.0 wt.-% dyes;

    f) 0.01 to 0.1 wt.-% aromatic substances;

    g) 0 to 0.1 wt.-% biocides and/or fungicides and/or other usual auxiliary substances; and

    h) 0.0001 to 2.0 wt.-% safety additive.

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