Fire Retardant Microcapsules for Incorporation Into Circuit Boards
Publication Date: 2011-Aug-16
The IP.com Prior Art Database
Disclosed is a method to incorporate a flame retardant into a microcapsule into a printed circuit board. This allows for a printed circuit board to have flame retardant properties through the microcapsules.
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Flame retardants are used within polymers, textiles, and coatings to limit the spread of a fire. These flame retardants come in different states from powders to liquids depending on their application. Typically in electronics, flame retardants are incorporated within the resins and fibers that are used to produce electrical products. These flame retardants have broad size distributions which can hinder the manufacturing of the circuit boards by changing the flow properties. One major problem with the use of phosphates and brominated flame retardants is that, when added to a product, they can be harmful to humans and the environment due to their potential to leach out.
The goal of this invention is to incorporate a phosphate flame retardant into a polymeric microcapsule that can be manufactured into a circuit board for use within electronics. Microcapsules can be generated with homogenous size distributions that will not leach out flame retardant and can be utilized as a flow controller in circuit board resins thus assisting and/or eliminating the need for nano-silica. Additionally, with microcapsules containing a more uniform size distribution, the homogeneity of the flame retardant in the laminate will be improved.
The core idea of this invention is to incorporate a phosphate flame retardant into a hollow polymeric microcapsule that can then be processed directly into circuit board materials. The resulting circuit board would have the ability to retard the flames as a direct result of the incorporation of the microcapsules which can be tailored to burst and supply a large amount of flame retardant to a specific area.
The advantages of this invention are as follows:
(1) The use of microcapsules will allow for a homogenous distribution of flame retardant.
(2) Microcapsules will prevent an agglomeration of flame retardant.
(3) Microcapsules do not hinder circuit board manufacturing.
(4) The use of microcapsules can be used as a viscosity controller and assist and/or eliminate nano-silica in controlling laminate flow.
(5) Microcapsules can be generated in a homogenous size, thus allowing for a controlled release of flame retardant per area.
(6) Environmentally friendly due to the protective packaging of the microcapsule to prevent leach out.
The invention works as follows: Flame retardant microcapsules are manufactured using an oil-in-water emulsion technique to create a protective polymeric sh...