Lavatory cleaning block comprising N,N-dichloro dialkyl hydantoin and aluminum hydroxide
US5178787A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 1991 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Mar 11, 2011 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC11D17/0056
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.