Shear thinning peroxide dispersions
A technology of organic peroxides and diacyl peroxides, applied in the field of aqueous dispersions, can solve problems such as being too sticky and difficult to operate
Inactive Publication Date: 2011-04-13
ARKEMA FRANCE SA
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Problems solved by technology
However, emulsions containing greater than about 19% by weight of organic peroxides have been described as being too viscous and thus difficult to handle
Method used
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example 1
[0025] An aqueous solution of 50% by weight benzoyl peroxide and 0.25% by weight polysorbate 20 was prepared and allowed to stand for two weeks. Viscosity was measured with a Brookfield viscometer at 20°C at 10 rpm using an RV-3 spindle. The viscosity after standing is about 8,5000-10,000 centipoise. The viscosity dropped to about 2,450-3,100 centipoise after vigorous shaking.
example 2
[0027] Aqueous solutions of 50% by weight benzoyl peroxide with 0, 0.25%, 0.50%, and 1.00% by weight of polysorbate 20 were prepared. The viscosity of each solution was measured with a Brookfield viscometer at 20°C and 1.5 rpm using a TC helipath. These viscosities are summarized in Table 1.
[0028] Table 1
[0029]
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Provided are dispersions which comprise more than about (40) percent by weight of an organic peroxide which is normally solid, an effective dispersing amount of a pharmaceutically acceptable dispersing agent and water. The water and about (40) percent or more peroxide forms a paste. Addition of the dispersing agent / surfactant to a non-flowing organic paste resulted in the formation of a shear thinning aqueous dispersion. The aqueous dispersions can also contain optional components such as thickening agents and anionic emulsifiers.
Description
field of invention [0001] This invention relates to pharmaceutically acceptable aqueous dispersions of normally solid organic peroxides. These dispersions are pastes containing high concentrations of the peroxide. These pastes are shear thinning and thus pumpable / pourable when mixed or stirred, which makes their handling and use easier. Background of the invention [0002] As a general property, peroxides have a tendency to be flammable and explosive, with some peroxides exhibiting such properties to a greater extent than others. For example, benzoyl peroxide may decompose when dry due to shock, friction, or static electricity. This characteristic carries with it significant hazards to the users of these materials and to their manufacturers and intermediate operators. A particularly troublesome aspect of this property arises during the shipment of these peroxides. Accordingly, it has long been a goal to provide flame retardant organic peroxide compositions. For example,...
Claims
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IPC IPC(8): C08F4/32
CPCC08K5/14C08F4/32
Inventor T·H·科泽尔J·M·格拉韦勒S·R·瑟沙德瑞T·萨尔瓦多
Owner ARKEMA FRANCE SA