Stock material or miscellaneous articles – Composite – Of polyamidoester
Reexamination Certificate
2007-07-17
2007-07-17
Kiliman, Leszek (Department: 1773)
Stock material or miscellaneous articles
Composite
Of polyamidoester
C428S502000, C428S505000, C428S506000, C528S230000
Reexamination Certificate
active
11248123
ABSTRACT:
The invention relates to phenol-free decorative laminates, in the form of sheets, such as HPL, CPL and LPL, using multilayer carrier materials in which no phenol resins are used for impregnation and which are therefore toxicologically safe, have a neutral odor and are more economical in their production. The impregnating resin system used is a urea/melamine/formaldehyde resin which was processed exclusively in an aqueous reaction medium and to which a polymer dispersion was added, the impregnating resin having been prepared in a first stage in the pH range from 7.0 to 8.5 and in a second stage in the pH range from 4.0 to 6.0. Finally, this resin batch is neutralized, added to the carrier material and pressed with the latter.
REFERENCES:
patent: 4997905 (1991-03-01), Druet et al.
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patent: 3208728 (1983-09-01), None
patent: 3837965 (1990-05-01), None
patent: 3876226 (1993-01-01), None
patent: 69604044 (1999-12-01), None
Ackner Fritz
Cassaghi Pietro
Görmar Gerhard
Kosche Gerhard
Sorlo Guiseppe
Brinks Hofer Gilson & Lione
Kiliman Leszek
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