Contents lists available at ScienceDirect Progress in Organic Coatings journal homepage: www.elsevier.com/locate/porgcoat UV-protection of cellulosic fabric prints using hyperbranched polyester- stabilized titania coating Osama A. Hakeim a, ⁎ , Fatma Abdelghaffar a , Ahmed A. Haroun b a Textile Research Division, National Research Center, Dokki, Cairo, Egypt b Chemical Industries Research Division, National Research Center, Dokki, Cairo, Egypt ARTICLE INFO Keywords: Hyperbranched polyesters Encapsulated phthalocyanine Titania UV shielding property Cellulosic fabrics and pigment fixation ABSTRACT This study approached a convenient method for the organic pigment coated with titania for attaining good UV- shielding properties. Hyperbranched polyesters (HBPs) included various HBPs; generation2 (HBPs16) and generation 4 (HBPs 64) are formulated for encapsulation of phthalocyanine pigments using liquid-phase se- paration method. The encapsulated pigments are then coated by titania via sol-gel process from n-butoxide (TBOT).Thermal gravimetric analysis (TGA), scanning/transmission electron microscope (SEM/TEM), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), X-ray diffraction pattern (XRD), and zeta potential analysis were examined to illustrate the coating performance of titania. The stabilized coated pigment nanocomposites are used for printing of cellulosic fabrics. UV shielding property of the pigment prints was systematically investigated. It is further demonstrated that the obtained titania shells of pigment prints can serve as an efficient protection against UV light and could obviously enhance the UV shielding property. The degree of protection depends on the numbers of functional hydroxyl end groups in hyperbranched polyesters. Besides, the titania coated pigment has no noticeable effect on the driving force for acceleration of pigment printing process under the unfavourable conditions. 1. Introduction Cellulosic fabrics have a broad range among all the textile fibres with respect to structures and properties. Cotton fibres are still very important textile fibres that are used worldwide and are increasing in consumption and reaching the highest level in 2010 [1–3].Viscose is another remarkable cellulosic fibre popularly used in textile. Today there is a revival for viscose to solve the ever-increasing problems of high consumption of cotton fabrics in the global market [3–5]. Pigment colorants, the more important group have been used po- pularly in different potential application, such as printing, coating, and paint industries due to their excellent properties for example, colour strength, photosensitivity and transparency [3,6,7]. Unfortunately, the poor weather durability and dispersion ability as well as the limited hiding power restrict their application in textile industry. In addition, the lack of their affinity for fabrics requires the user of a resinous binder to fix pigment particles and attain colour fastness [3,7]. On a global basis, about 50% of textile operations are processed using pigment printing, with special attention to cellulose fabrics. Pigment-based inks do not inquire pre-treatment of cellulose fabrics prior to printing. This can be achieved by simple heat treatment of printed fabrics without steaming and washing, which is essential for dye-based inks. However, the few problems resulting from the pigment printing such as relatively high fixation temperature, harsh feeling hands, and the weakness of friction stability for printed goods limit their application [2,3,8]. Modification of organic pigments approached by many researchers is the driving force to accelerate the pigment printing processing and improve the stability of pigment dispersions, thus prevents the floccu- lation and the coagulation of the pigments [3,6,9–16]. Ultraviolet protective materials and colorants have received re- cently a lot of attention from both industry and academia [17–19]. Ultraviolet light (UV) has been emitted by the sun in the UVA, UVB, and UVC bands [17,20]. Although, UVB exposure stimulates the production of vitamin D in the skin of humans, it can cause a direct DNA damage. Besides, the protracted exposure to ultraviolet radiation can lead to severe and chronic health effects on our body [17,21]. Recently it was proposed that in reality UVA contributes altogether for actinic skin maturing and skin disease. As a result, the subject of study has been focused as of late on the development of photoprotective and UV shielded materials has the perfect UV protection and were opaque to both UVB and UVA radiation which allow good transmission in the https://doi.org/10.1016/j.porgcoat.2019.105295 Received 7 June 2019; Received in revised form 20 August 2019; Accepted 25 August 2019 ⁎ Corresponding author. E-mail address: oa.abdelrahman@nrc.sci.eg (O.A. Hakeim). Progress in Organic Coatings 136 (2019) 105295 Available online 01 September 2019 0300-9440/ © 2019 Elsevier B.V. All rights reserved. T