Aqueous coating compositions for use in surface treatment of cellulosic substrates

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Patent Details

Publication Number
WO2011012934
PT104702
Priority Date
2009-07-31
Publication Date
2011-02-03
International Patent Classification
D21H17/21
C09D101/02
C09D105/08
D21H19/34

Figures

figura
Scanning electron microscopy images of paper sheets coated in a size-press machine with formulations based on chitosan and bacterial cellulose.

Abstract

The present invention relates with the application of novel coating compositions, containing chitosan (and its derivatives) and bacterial cellulose, for the improvement of the final properties of cellulosic based materials, like paper and textile materials. The process involves the preparation of homogeneous bacterial cellulose-chitosan blends and the surface treatment of cellulosic substrates with these blends. The surface treatments described improve substantially the surface, mechanical, optical, barrier, anti-microbial properties and printability of the cellulosic substrates.

Innovative aspects & main advantages

The innovation of this patent relies on the use of novel coating formulations, containing chitosan and bacterial nanocellulose, for the improvement of the final properties of cellulosic based materials, like paper and textiles.
The combination of chitosan and bacterial cellulose (together with other additives) allows the dispersion and application (under shear conditions) of bacterial cellulose onto several cellulosic substrates using common coating technologies, and simultaneously the production of coated materials with improved properties, including surface, barrier and optical properties, printability and antimicrobial activity.

Applications

The process of this invention can be explored in any industrial sector that produce coated cellulosic based materials, like the paper and textile industries. The exploitation of this process might contribute to the development/commercialization of innovative and differentiated cellulose based products.

Inventors

Neto, Carlos; Barros, Carmen; Fernandes, Susana; Silvestre, Armando; Gandini, Alessandro;

Our Inventors

foto Carlos Pascoal Neto

Carlos Pascoal Neto

Raiz Director
foto Carmen Sofia da Rocha Freire Barros

Carmen Sofia da Rocha Freire Barros

Coordinating Researcher

Applicant

Universidade de Aveiro

Groups Involved

G4 - Renewable Materials and Circular Economy

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