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    Date submitted
  • 05-Nov-2018

Flora Coatings

Abstract

The antimicrobial activities can be achieved by traditionally utilized commercial products that claim to offer high antimicrobial efficacy. However, such antimicrobial activity vanishes within a brief time of such commercial products application and the leftover microbes thrive on such surfaces. It is therefore evident that long term stability of the product on the treated object is essential for pathogen free surface. Most of the commercial products do not offer long term stability due to their limited adhesion capabilities.

The commercial products available in the market are formed by dispersing antimicrobial agents in polymeric matrix which on application forms paints like surface. A microscopic level of homogeneous dispersion of antimicrobial agents in polymeric matrix is significantly difficult if not impossible; that leaves behind the regimes for the microbial attachment and prosperity. Later, these hydrocarbon-based paint and coating surfaces serve as a food for the growth of microbes. As mentioned earlier, the adhesion of commercial paint and coatings to various substrates and dry film thickness has been a major challenge that limits the universal acceptability of any commercial antimicrobial coating product.

The dilemma and challenge for the antimicrobial coating industry is the delivery of antimicrobial agent for the effectiveness. The antimicrobial activity in most products is through biocidal action achieved by leaching of antimicrobial agents from polymeric surfaces such as paints. For an efficient biocidal action, polymer matrix in such coatings should be softer and not dense to release the chemical agents. Such softer polymer matrices are incapable of providing long term surface adhesion and service life.

Here we propose a unique silicone based biocermaic biostatic coating that does not contain hydrocarbon backbone. The use of silicone based antimicrobial coatings have been proposed earlier without much success due to following issues:

(i) Silicone based coatings contained hydrocarbon in backbone and have limited adhesion capabilities to surfaces.

(ii) Due to low surface energy, silicones have exceptional ability to encapsulate ingredients added to the coating matrix thereby limiting the surfacial antimicrobial activity.

(iii) The most antimicrobial activity observed on the silicone based antimicrobial coatings was due the slippery siloxane surface rather than from antimicrobial agents (as these are encapsulated and not available for action).

In the proposed technology, we have developed unique silicone chemistry that helps in achieving the maximum antimicrobial activity from the utilized antimicrobial agents. The antimicrobial agents are self-aligned and distributed homogeneously throughout the coating matrix. The antimicrobial agent defies low surface energy of siloxanes and imparts maximum antimicrobial activity. The low solution viscosity helps coating macromers to seep hard to reach places and adopt coated surface contours. The high reactivity, and significantly high adhesion capability of coating to wide varieties of surfaces insures the long-term stability of coated surface. The solidified coating is transparent, ultrathin and creates hard impervious barrier without adding weight or sacrificing the original surface appearance. The solid coating is a bioceramic structure without hydrocarbon backbone and leftover functional groups. This coating can be used indoor, outdoor and also on human artificial implants. The proposed coating therefore offers antimicrobial activities to coated objects through following mechanisms:

a) Not allowing the adhesion of pathogens to the surface through self-cleaning action

b) Not a hydrocarbon feeding due to bioceramic backbone

c) Safer biostatic antimicrobial activity without leaching off active agents

d) Effective and unique antimicrobial action on surface and throughout coating thickness

e) Exceptional long-term service life through invisible coating thickness and strong adhesion tendency

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