Multilayered biocidal film compositions
AssigneeSouthwest Research Institute
InventorsStephen T. Wellinghoff, Joel J. Kampa
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Abstract
A multilayered composite for providing sustained release of chlorine dioxide includes a hydrophobic layer containing an acid releasing agent, and a hydrophilic layer containing chlorite anions. The hydrophilic and hydrophobic layers are adjacent and substantially free of water, and the hydrophilic layer is capable of releasing chlorine dioxide upon hydrolysis of the acid releasing agent.
Claims50
A multilayered composite for providing sustained release of chlorine dioxide comprising:
- a hydrophobic layer containing an acid releasing agent;
- and
- a hydrophilic layer containing chlorite anions, the hydrophilic and hydrophobic layers being adjacent and substantially free of water, the hydrophilic layer being capable of releasing chlorine dioxide upon hydrolysis of the acid releasing agent.
A multilayered composite for providing sustained release of chlorine dioxide comprising:
- a layer comprising a hydrophobic phase containing an acid releasing agent and a hydrophilic phase containing chlorite anions, the hydrophilic and hydrophobic phases being interdispersed and substantially free of water;
- and
- a moisture regulating layer in contact with a surface of the layer, such that moisture permeating the moisture regulating layer hydrolyzes the acid releasing agent to initiate release of chlorine dioxide from the multilayered composite.
A multilayered composite for providing time pulsed release of chlorine dioxide comprising:
- at least one hydrophobic layer containing an acid releasing agent,
- at least one hydrophilic layer containing chlorite anions, and
- at least three barrier layers to control the diffusion of water into the hydrophobic layer or the diffusion of hydronium ions produced by hydrolysis of the acid releasing agent into the hydrophilic layer,
- the arrangement of the layers in the composite being defined by the formula C(ACB).sub.n C wherein C is a barrier layer, A is a hydrophobic layer, B is a hydrophilic layer, and n is an integer ranging from 1 to 10.
Dependencies are inferred from the claim text.