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Method for hidden marking of transparent polypropylene film

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Objectives. To quantitatively describe the thermochromic properties of films of isotactic polypropylene, a large-tonnage polymer widely used in the production of flexible packaging for goods and foodstuffs, as well as substantiate the possibility of covert labeling of transparent packaging.
Methods. Differential scanning calorimetry, polarization photometry, infrared Fourier spectrometry, gravimetry, temperature control, physical and mechanical strength testing.
Results. The identified thermochromic effect of dichroism in polarized light on industrial samples of transparent biaxially oriented film of isotactic polypropylene was studied. A change in the phase composition of the film-forming composition during short-term heating during marking was established. The absence of heat shrinkage and change in transparency in non-polarized light was shown, which provides the possibility of hidden recording of information and its contrast manifestation in a passing light stream at a certain arrangement of light filters.
Conclusions. The causes and optimal conditions of the thermochromic effect are established. It is proposed to use local contact heat treatment of a polypropylene film for covert recording of information and marking of product packaging in order to protect against counterfeiting.

About the Authors

A. A. Nikolaev
Moscow Polytechnic University
Russian Federation

Alexander A. Nikolaev, Lecturer, Department of Innovative Materials of the Print Media Industry

38, Bolshaya Semenovskaya ul., Moscow, 127008

RSCI SPINcode 8146-7143

A. P. Kondratov
Moscow Polytechnic University
Russian Federation

Alexander P. Kondratov, Dr. Sci. (Eng.), Professor, Department of Innovative Materials of the Print Media Industry

38, Bolshaya Semenovskaya ul., Moscow, 127008

Scopus Author ID 6603924314

RSCI SPIN-code 8689-3888


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Supplementary files

1. Dichroism effect in a sample interval polypropylene film in transmitted polarized light when film sample is located relative to polarizers at angles 15° (a) and 45° (b).
Type Исследовательские инструменты
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Indexing metadata
  • A new technological method for hidden marking, recording and visualization of information in polarized light on “sleeve” oriented films of isotactic polypropylene was developed.
  • The use of hidden marking with bar codes will eliminate the counterfeiting of packaging of well-known brands and counteract the sale of counterfeit products.


For citations:

Nikolaev A.A., Kondratov A.P. Method for hidden marking of transparent polypropylene film. Fine Chemical Technologies. 2022;17(4):346-356.

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ISSN 2410-6593 (Print)
ISSN 2686-7575 (Online)