Patent GB-1011763-A (GB)
Title: Pressure sensitive adhesive tape
IPC: C09J7/30
Filed: 1961-07-05
Abstract: A pressure-sensitive adhesive tape comprises a transparent film base and a plurality of transparent coatings thereon including at least one coating of pressure-sensitive adhesive, one of the coatings containing up to 0.2 ounces per square yard of a non-metallic fluorescent material of at least 0.001% concentration by weight and capable of converting light of wave-lengths 2800-4000<\>rA into light of 4400-5125<\>rA, for producing a whiter product.  The tape may have a primer coating between the film base and the adhesive layer and a backsize coating on the other side of the film base; any of these coatings may carry the fluorescent material. Alternatively, the fluorescent material may be deposited, preferably in aqueous solution, in separate coatings between the film base and the backsize or primer coatings, respectively. The luminescent material may include anthracene, carbazole, chrysene, acridine, quinoline, fluorene, bi-phenyl, ter-phenyl, perylene, xanthone, phenanthrene, umbelliferone, dibenzanthracene, coumarin, anthranthrene, stilbene, substituted naphthalene and derivatives thereof. Any filling agents should be removed.  The backsize may be based on alkyd, urea-formaldehyde, melamine formaldehyde, phenol-formaldehyde epoxyline resin, polyacrylate, cellulose ester or ether.  The primer may be based on aqueous or non-aqueous solvents such as hydrophylic glutinous materials mixed with lattices of hydrophobic elastomers; or on solvated elastomers with or without di-isocyanates or alkyl titanates.  The adhesive may be based on polyacrylates, polyvinyl ethers, castor oil ether, polyurethanes, natural or synthetic rubber with the usual additions of tackifying resins, curing resins, accelerators, anti-oxidants or fillers.  The film base may be based on regenerated cellulose, cellulose esters or ethers, rubber hydrochloride synthetic resins, polyesters or chlorinated rubber.  A number of specific examples are given.  Specifications 427,702, 514,402, 554,019, 653,675 and 865,971 are referred to.ALSO:A pressure-sensitive adhesive tape comprises a transparent film base and a plurality of transparent coatings thereon including at least one coating of pressure-sensitive adhesive, one of the coatings containing up to 0,2 ounce per square yard of a non-metallic fluorescent material of at least 0,001% concentration by weight and capable of converting light of wavelengths 2800-4000  into light of 4400-5125 , for producing a whiter product.  The tape may have a primer coating between the film base and the adhesive layer and a backsize coating on the other side of the film base; any of these coatings may carry the fluorescent material.  Alternatively the fluorescent material may be deposited, preferably in aqueous solution in separate coatings between the film base and the backsize or primer coatings, respectively.  The luminescent material may include anthracene, carbazole, chrysene, acridine, quinoline, fluorene, bi-phenyl, ter-phenyl, perylene, xanthone, phenanthrene, umbelliferone, dibenzanthracene, coumarin, anthranthrene, stilbene, substituted naphthalene and derivatives thereof.  Any filling agents should be removed.  The backsize may be based on alkyd, urea-formaldehyde, melamine formaldehyde, phenol-formaldehyde epoxyline resin, polyacrylate, cellulose ester or ether.  The primer may be based on aqueous or non-aqueous solvents such as hydrophilic glutinous materials mixed with lattices of hydrophobic elastomers; or on solvated elastomers with or without di-isocyanates or alkyl titanates.  The adhesive may be based on polyacrylates, polyvinyl ethers, castor oil ether, polyurethanes, natural or synthetic rubber with the usual additions of tackifying resins, curing resins, accelerators, anti-oxidants or fillers.  The film base may be based on regenerated cellulose, cellulose esters or ethers, rubber hydrochloride synthetic resins, poleysters or chlorinated rubber.  A number of specific examples are given.  Specifications 427,702, 514,402, 554,019, 653,675 and 865,971 are referred to.