Method of producing a tamper-proof laminate and product obtained thereby
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
Mar 15, 1991
filing date -
Mar 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a laminated product wherein at least one supported information-containing hydrophilic colloid layer is adhesively bonded on at least one of its surfaces to a protective hydrophobic resin sheet, improved adherence is achieved by using as the bonding adhesive a cationic crosslinked polymer obtained by: a) condensing a polyalkylenepolyamine containing at least two primary amino groups and at least one secondary or tertiary amino group with a dicarboxylic acid to form a polyamidoamine, b) subjecting the resultant polyamidoamine to a graft reaction in the presence of an acid catalyst with an alkene-1,2-imine, and c) crosslinking the resultant graft polymer with an epihalohydrin, an Alpha-Omega dihalohydrin ether or the ether compound obtained by reaction of epichlorohydrin with a water-soluble polyalkyleneoxide to form the water-soluble cationic polymer. With this adhesive bond, a tamper-proof seal can be obtained between the information-containing colloid layer and the hydrophobic resin protective sheet.
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