Lavatory cleansing block

Abstract

A lavatory cleansing block has two parts. The formulations of each part are such that one part has a substantially shorter in-use life time than the other part. The faster dissolving part may provide a different active ingredient to the lavatory bowl or an increased impact, such as foam level or smell, for the user. A cleansing block comprising a colorant and less than 5% by weight is also claimed. Apparatus for making a lavatory cleansing block comprising means for forming a body formed from a first composition, the body having at least one aperture there through.

1 . A lavatory cleansing block comprising at least two parts, the parts being formed from respective compositions, wherein, in use, at least one part dissolves substantially more rapidly than the or an other part or parts. 
   
   
       2 . A block according to  claim 1 , wherein, in use, one part dissolves at least two times as fast as the other part(s). 
   
   
       3 . A block according to  claim 1 , wherein, in use, the one part dissolves at least three time as fast as the other part(s). 
   
   
       4 . A block according to  claim 1 , wherein, in use, the one part dissolves at least four times as fast as the other part(s). 
   
   
       5 . A block according to  claim 1 , wherein the one part is dissolved substantially completely within one week. 
   
   
       6 . A block according to  claim 5 , wherein the one part is dissolved substantially completely in less than three days. 
   
   
       7 . A block according to  claim 1 , wherein the other part is dissolved substantially completely after three weeks. 
   
   
       8 . A block according to  claim 7 , wherein, in use, the other part is dissolved substantially completely after four weeks. 
   
   
       9 . A block according to  claim 1 , wherein the one part and the or an other part dissolve in use to provide a respective active component into the flush water of the toilet bowl, and the one part dissolves to provide an active component which is not provided by the other part. 
   
   
       10 . A block according to  claim 1 , wherein the one part and the or an other part dissolve to provide a common active component into the flush water of the toilet bowl, and the concentration of active component provided by the one part in the toilet bowl is substantially higher than that provided by the other part. 
   
   
       11 . A block according to  claim 10 , wherein the concentration of active component provided in the flush water by the one part is at least twice the concentration provided by the other part. 
   
   
       12 . A block according to  claim 11 , wherein the concentration of active component provided in the flush water by the one part is at least four times the concentration of the other part. 
   
   
       13 . A lavatory cleansing block comprising a body formed from a first composition; the body having at least one aperture therethrough which contains a core formed from a second composition, and wherein the first and second compositions dissolve at different rates in use. 
   
   
       14 . A block according to  claim 13 , wherein the composition which dissolves more rapidly comprises a component which accelerates dissolution. 
   
   
       15 . A block according to  claim 14 , wherein said composition comprises citric acid. 
   
   
       16 . A block according to  claim 14 , wherein the said composition comprises sodium bicarbonate. 
   
   
       17 . A block according to  claim 13 , wherein the composition which dissolves less rapidly comprises a solubility control agent which retards dissolution. 
   
   
       18 . A block according to  claim 17 , wherein said composition comprises a hydrophobe. 
   
   
       19 . A block according to  claim 13 , wherein, when the block is in use, the component made from. the composition which dissolves more rapidly dissolves in less than one week. 
   
   
       20 . A block according to  claim 19 , wherein said component dissolves in between one to three days. 
   
   
       21 . A block according to  claim 13 , wherein, when the block is in use, the component made from the composition which dissolves less rapidly dissolves in one week or more. 
   
   
       22 . A block according to  claim 11 , wherein the first composition dissolves in 3 weeks or more. 
   
   
       23 . A block according to  claim 13 , wherein the second composition dissolves more rapidly than the first composition. 
   
   
       24 . A block according to  claim 13 , wherein the core projects from at least one side of the block. 
   
   
       25 . A block according to  claim 13 , wherein the core and the body have different colours. 
   
   
       26 . A block according to  claim 13 , wherein the body is extruded. 
   
   
       27 . A block according to  claim 26 , wherein the body and core are co-extruded. 
   
   
       28 . Apparatus for making a lavatory cleansing block comprising means for forming a body formed from a first composition, the body having at least one aperture therethrough. 
   
   
       29 . Apparatus according to  claim 28 , comprising means for forming a core formed from a second composition, the core being contained in the aperture. 
   
   
       30 . Apparatus according to  claim 28 , wherein the body-forming means comprises an extruder. 
   
   
       31 . Apparatus according to  claim 30 , wherein the body and core are formed by a co-extruder. 
   
   
       32 . Apparatus according to  claim 29 , comprising means for shaping the core so that the core projects from the body. 
   
   
       33 . Apparatus according to  claim 32 , wherein the means for shaping the core comprises a stamp for applying a force to one end of the core. 
   
   
       34 . Apparatus according to  claim 33 , wherein the means for shaping the core comprises a mould for shaping the other end of the core. 
   
   
       35 . Apparatus according to  claim 33 , comprising means for preventing the block from sticking to the stamp and/or mould. 
   
   
       36 . Apparatus according to  claim 35 , comprising means for cooling the block. 
   
   
       37 . Apparatus according to any of  claim 35 , comprising means for coating the block. 
   
   
       38 . A lavatory cleansing block comprising a colourant and less than 5 percent by weight titanium dioxide. 
   
   
       39 . A block as claimed in  claim 38 , wherein less than 2 percent and preferably less than about 1.5 percent by weight of titanium dioxide is provided. 
   
   
       40 . A lavatory cleansing block comprising at least two parts, the parts being formed from respective compositions, wherein the in use lifetime of one part is at least twice as long as the in-use lifetime of the or another part. 
   
   
       41 . A lavatory cleansing block as claimed in  claim 40 , wherein the in-use lifetime of the one part is at least three and preferably at least four times as long as the in-use lifetime of the or another part 
   
   
       42 . A lavatory cleansing block as claimed in  claim 40 , wherein the in-use lifetime of the one part is at least seven times as long as the in-use lifetime of the or another part. 
   
   
       43 . A lavatory cleansing block comprising at least two parts, the parts being formed from respective compositions, wherein the in use lifetime of one part is between 2 and 20 times as long as the in-use lifetime of the or another part. 
   
   
       44 . A lavatory cleansing block as claimed in  claim 43 , wherein the in use lifetime of one part is between three and 15 times as long as the in-use lifetime of the or another part. 
   
   
       45 . A lavatory cleansing block as claimed in  claim 44 , wherein the in use lifetime of one part is between four and 10 times as long as the in-use lifetime of the or another part. 
   
   
       46 . A two part lavatory cleansing block having: in the first part: from 40 to 80% by weight, of the first part, of surfactant, 10 to 30% by weight of polyacrylate, and from 0 to 20% by weight of hydrophobe; of the other part: from 65 to 85% by weight, of the other part, of surfactant and from 0 to 20% by weight of hydrophobe. 
   
   
       47 . A lavatory cleansing block as claimed in  claim 46 , wherein the surfactant is present in the first part in an amount of from 45 to 55% by weight. 
   
   
       48 . A lavatory cleansing block as claimed in  claim 47 , wherein the surfactant is present in the second part in an amount of from 70 to 80% by weight. 
   
   
       49 . A lavatory cleansing block as claimed in  claim 46 , wherein the hydrophobe is or includes pine oil. 
   
   
       50 . A lavatory cleansing block as claimed in  claim 46 , wherein the hydrophobe is or includes a primary alcohol and/or an ethoxylate. 
   
   
       51 . A lavatory cleansing block as claimed in  claim 46 , wherein the first part includes a colourant. 
   
   
       52 . A lavatory cleansing block as claimed in  claim 46 , wherein the first part has an in-use lifetime of at least three weeks. 
   
   
       53 . A lavatory cleansing block as claimed in  claim 52 , wherein the first part has an in-use lifetime of about four weeks. 
   
   
       54 . A lavatory cleansing block as claimed in  claim 46 , wherein the other part has an in-use lifetime of less than three weeks. 
   
   
       55 . A lavatory cleansing block as claimed in  claim 54 , wherein the other part has an in-use lifetime of about two weeks. 
   
   
       56 . A two part lavatory cleansing block having: in the first part from 40 to 80% by weight of surfactant, from 10 to 30% by weight of polyacrylate, and 0 to 20% by weight of hydrophobe, and in the other part from 15 to 35% by weight, of the part, of surfactant, from 30 to 60% by weight of filler, and from 0 to 20% of a gassing agent. 
   
   
       57 . A lavatory cleansing block as claimed in  claim 56 , wherein the hydrophobe is or includes pine oil. 
   
   
       58 . A lavatory cleansing block as claimed in  claim 56 , wherein the hydrophobe is or includes a primary alcohol, and/or an ethoxylate. 
   
   
       59 . A lavatory cleansing block as claimed in  claim 56 , wherein the filler is a salt such as sodium sulphate. 
   
   
       59 . A lavatory cleansing block as claimed in  claim 56 , wherein the gassing agent includes a citrate, preferably citric acid, and/or a bicarbonate, preferably sodium bicarbonate. 
   
   
       60 . A lavatory cleansing block as claimed in  claim 56 , wherein the surfactant is present in the first part in an amount of from 45 to 55% by weight. 
   
   
       61 . A lavatory cleansing block as claimed in  claim 56 , wherein the surfactant is present in the second part in an amount of from 20 to 30% by weight. 
   
   
       62 . A lavatory cleansing block as claimed in  claim 56 , wherein the second part has an in-use lifetime of less than one week. 
   
   
       63 . A lavatory cleansing block as claimed in  claim 61 , wherein the second part has an in-use lifetime of less than four days. 
   
   
       64 . A lavatory cleansing block as claimed in  claim 56 , wherein the first part has an in-use lifetime of at least three weeks. 
   
   
       65 . A lavatory cleansing block as claimed in  claim 64 , wherein the second part has an in-use lifetime of about four weeks. 
   
   
       66 . A lavatory cleansing block comprising first and second parts, the first part formed as an annulus and the second part substantially filling the centre of the annulus, wherein the composition of the second part includes at least 65% by weight, of the second part, of surface active agent and preferably 70 to 80%. 
   
   
       67 . A lavatory cleansing block as claimed in  claim 66 , wherein the second part includes a gassing agent. 
   
   
       68 . A lavatory cleansing block as claimed in  claim 46 , wherein the surfactant is an anionic surfactant. 
   
   
       69 . A block according to  claim 15 , wherein the said composition comprises sodium bicarbonate. 
   
   
       70 . Apparatus according to  claim 29 , wherein the body-forming means comprises an extruder. 
   
   
       71 . Apparatus according to  claim 34 , comprising means for preventing the block from sticking to the stamp and/or mould. 
   
   
       72 . A lavatory cleansing block as claimed in  claim 57 , wherein the hydrophobe is or includes a primary alcohol, and/or an ethoxylate. 
   
   
       73 . A lavatory cleansing block as claimed in  claim 57 , wherein the gassing agent includes a citrate, preferably citric acid, and/or a bicarbonate, preferably sodium bicarbonate. 
   
   
       74 . A lavatory cleansing block as claimed in  claim 58 , wherein the gassing agent includes a citrate, preferably citric acid, and/or a bicarbonate, preferably sodium bicarbonate.