Spreadable adhesive compositions and applicators for use therewith

Abstract

A spreadable adhesive composition and an applicator ( 1 ) for dispensing a spreadable viscous adhesive composition onto a substrate. The spreadable adhesive composition is a spreadable non-flowable cyanoacrylate adhesive composition which contains an odour masking ingredient compatible with the composition. The composition is intended to be spread by the applicator ( 1 ). The applicator ( 1 ) for spreading the composition includes a closed head ( 5 ) with a sealable dispensing aperture ( 9 ) penetrating the head ( 5 ). A spreading surface ( 19 ) is located on the exterior of the head ( 5 ) around the dispensing aperture ( 9 ) and is used to spread the adhesive onto the substrate. A conduit or delivery means ( 7 ) is also provided to supply the adhesive composition to the dispensing aperture ( 9 ). The applicator ( 1 ) can also include a cap ( 2 ) which fits over and covers the head ( 5 ). The cap ( 2 ) includes a structure ( 14 ) which engages with the dispensing aperture ( 9 ) to seal the aperture ( 9 ) closed preventing adhesive from being dispensed. The invention also provides a container ( 17 ) for holding a spreadable adhesive composition. The invention further provides a pack comprising an applicator ( 1 ) and a container ( 17 ) as described above which a user can assemble to dispense the spreadable adhesive compositions.

1 . An applicator for dispensing a viscous adhesive composition onto a substrate, said applicator having a body with a closed head, a sealable dispensing aperture penetrating the head, conduit or delivery means to supply the adhesive composition to the dispensin aperture, a wide non-porous spreading surface on the exterior of the head around the dispensing aperture, and means for inibiting flow of adhesive compositions along the exterior of the applicator, said means for inhibiting flow of adhesive compositions comprising an annular step positioned between the head of the applicator and that part of the applicator to which a cap is attachable.  
     
     
         2 . An applicator according to  claim 1  wherein the dispensing aperture is valveless.  
     
     
         3 . An applicator according to  claim 1  or  claim 2  wherein the spreading surface is dome-shaped.  
     
     
         4 . An applicator according to any preceding claim wherein the head has a corner at the perimeter of the spreading surface.  
     
     
         5 . An applicator according to  claim 4  wherein the corner is carved.  
     
     
         6 . An applicator according to  claim 4  or  5  wherein the corner runs from the head toward the body.  
     
     
         7 . An applicator according to any one of  claims 4  to  6  wherein the corner runs about the entire perimeter of the spreading surface.  
     
     
         8 . An applicator according to any one of  claims 4  to  6  wherein the corner is formed by the convergence of two edges of the spreading surface.  
     
     
         9 . An applicator according to any one of  claims 4  to  8  wherein the corner is also formed in the body of the applicator.  
     
     
         10 . An applicator according to any one of  claims 1  to  9  wherein the spreading surface or applicator is of a generally rectangular shape or is generally wedge-shaped.  
     
     
         11 . An applicator according to any of the preceding claims in combination with a cap which fits over the head and which has a structure inside the cap for engaging the dispensing aperture so as to close the aperture.  
     
     
         12 . An applicator for dispensing a viscous adhesive composition onto a substrate, said applicator having a closed head, a sealable valveless dispensing aperture penetrating the head, a wide spreading surface on the exterior of the head around the dispensing aperture, and conduit or delivery means to supply the adhesive composition to the dispensing aperture, in combination with a container holding a viscous adhesive composition.  
     
     
         13 . An applicator according to any one of  claims 1  to  11  in combination with a container holding a viscous adhesive composition.  
     
     
         14 . A pack comprising an applicator and container according to  claim 12  or  claim 13  having complementary engagement means on the applicator and the container respectively.  
     
     
         15 . A pack comprising an applicator and container according to  claim 14  wherein the applicator has cutting means for piercing a closure on the container during the course of interengagement of the engagement means.  
     
     
         16 . A pack comprising an applicator and container according to any of  claims 13  to  15  wherein the container holds an alpha-cyanoacrylate adhesive composition.  
     
     
         17 . A pack according to  claim 16  wherein the adhesive composition has a Casson Infinite Shear Viscosity in the range 300-50,000 mPa.s and a Yield Point in the range 1-20 Pa.  
     
     
         18 . A pack according to  claim 16  or  17  wherein the adhesive composition is a gel.  
     
     
         19 . A pack according to any one of  claims 16  to  18  wherein the adhesive composition includes an odour masking ingredient compatible with the composition.  
     
     
         20 . A spreadable non-flowable alpha-cyanoacrylate adhesive composition containing an odour masking ingredient compatible with the composition.  
     
     
         21 . A spreadable non-flowable alpha-cyanoacrylate adhesive composition packaged in a tube.  
     
     
         22 . A spreadable non-flowable adhesive composition consisting essentially of: 
 (i) an alpha-cyanoacrylate ester monomer in an amount of 65-90% by weight;    (ii) one or more fillers in a total amount of 5-30% by weight;    (iii) other components of a cyanoacrylate adhesive composition, to a total of 100% by weight,    the composition being packaged in a dispensing pack adapted to spread a film onto a substantial area of a substrate.    
     
     
         23 . A spreadable non-flowable adhesive composition for use with an applicator according to any of claims  1 - 11 , said composition consisting essentially of: 
 (i) an alpha-cyanoacrylate ester monomer in an amount of 75-85% by weight;    (ii) one or more fillers in a total amount of 5-20% by weight;    (iii) a plasticiser in an amount of 10-15% by weight;    (iv) other components of a cyanoacrylate adhesive composition, to a total of 100% by weight.    
     
     
         24 . A spreadable non-flowable adhesive composition solidified in a desired geometric form, said composition consisting essentially of: 
 (i) an alpha-cyanoacrylate ester monomer in an amount of 70-80% by weight;    (ii) one or more fillers in a total amount of 15-30% by weight;    (iii) other components of a cyanoacrylate adhesive composition, to a total of 100% by weight.    
     
     
         25 . A composition according to  claim 20 ,  23  or  24  also containing an odour mask compatible with the composition.  
     
     
         26 . A dispensing pack comprising an applicator according to any of claims  1 - 11  in combination with a container holding an adhesive composition according to  claim 23  or  24 .  
     
     
         27 . A dispensing pack comprising an applicator according to any of claims  1 - 11  in combination with a container holding an adhesive composition according to  claim 23 .  
     
     
         28 . A method of bonding two substrates comprising applying to at least one of the substrates a film of a cyanoacrylate adhesive composition dispensed and spread by means of an applicator according to any of claims  1 - 11  or a pack according to any of claims  14 - 19 ; and bringing the two substrates together.  
     
     
         29 . A method of bonding two substrates comprising applying to at least one of the substrates a film of a composition according to any of  claims 20  to  25 ; and bringing the two substrates together.