Lavatory cleaning block comprising N,N-dichloro dialkyl hydantoin and aluminum hydroxide
AssigneeBlock Drug Company, Inc.
InventorsJohn H. C. Hung, Robert Carmello
Life of this patent
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Abstract
A toilet cleaning block which releases a halogen disinfecting agent in a controlled, substantially constant rate for 2 to about 4 months of constant contact with water and is then completely dissolved in the water comprises an admixture of an agent which releases a halogen disinfecting agent when in contact with water, about 4 to 10% aluminum hydroxide based on the total weight of the block and up to about 1% by weight of a mold release lubricant, said admixture being in the form of a coherent solid resistant to internal water penetration having a density of 1.10 to 1.60 g/cc, a ratio of effective surface area to weight of about 1:1.05 to 1:1.25 and a crush fracturing strength of about 9-109 kg.
Claims14
A toilet cleaning block which releases a halogen disinfecting agent in a controlled, substantially constant rate for 2 to about 4 months of constant contact with water and which has completely dissolved at the end of said time which comprises an admixture of an N,N-dichloro dialkyl hydantoin which releases a halogen disinfecting agent when in contact with water, between 6 and 8 weight % based on the weight of the block of aluminum hydroxide, and up to about 1 % by weight of a mold release lubricant, said admixture being in the form of a coherent solid resistant to internal water penetration having a density of 1.10 to 1.60 g/cc, a ratio of effective surface area to weight of about 1:1.05 to 1:1.25 cm.sup.2 /g and a crush fracturing strength of about 9 to 109 kg.
A toilet cleaning block which releases a chlorine disinfecting agent in a controlled, substantially constant rate for 2 to about 4 months of constant contact with water and which has completely dissolved at the end of said time which consists essentially of an admixture of an N,N-dichloro dialkyl hydantoin which releases a chlorine disinfecting agent when in contact with water, between 6 and 8 weight % based on the weight of the block of aluminum hydroxide, and up to about 1 % by weight of a mold release lubricant, said admixture being in the form of a coherent solid resistant to internal water penetration having a density of 1.30 to 1.50 g/cc, a ratio of effective surface area to weight of about 1:1.10 to 1:1.20 cm.sup.2 /g and a crush fracturing strength of about 9 to 109 kg.
Dependencies are inferred from the claim text.