Pressure-sensitive adhesive tape produced from photoactive mixture of acrylic monomers and polynuclear-chromophore-substituted halomethyl-2-triazine
First Claim
1. Pressure-sensitive adhesive tape comprising a backing member and at least one adhesive layer produced from a photoactive mixture comprising by weight(a) 50-100 parts of alkyl acrylate and 0-50 parts of copolymerizable monoethylenically unsaturated monomer and(b) 0.01 to 2 parts of a polynuclear-chromophore-substituted halomethyl-s-triazine of the formula ##STR8## wherein each of R1 and R2 is hydrogen, alkyl, or alkoxy.
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Abstract
Pressure-sensitive adhesive tape, the adhesive layer of which is produced from a mixture of (1) a pressure-sensitive adhesive alkyl acrylate polymer and (b) a polynuclear-chromophore-substituted halomethyl-s-triazine such as ##STR1## which has been exposed to ultraviolet radiation to cause the polymer to become crosslinked.
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Citations
19 Claims
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1. Pressure-sensitive adhesive tape comprising a backing member and at least one adhesive layer produced from a photoactive mixture comprising by weight
(a) 50-100 parts of alkyl acrylate and 0-50 parts of copolymerizable monoethylenically unsaturated monomer and (b) 0.01 to 2 parts of a polynuclear-chromophore-substituted halomethyl-s-triazine of the formula ##STR8## wherein each of R1 and R2 is hydrogen, alkyl, or alkoxy.
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11. Method of making a pressure-sensitive adhesive tape comprising the steps of
(1) mixing by weight (a) 100 parts of a composition comprising 50-100 parts of alkyl acrylate monomer and 0-50 parts of copolymerizable monoethylenically unsaturated monomer, which composition is polymerizable or has been polymerized to a pressure-sensitive adhesive state and (b) 0.01 to 2 parts of a polynuclear-chromophore-substituted halomethyl-s-triazine of the formula ##STR11## wherein each of R1 and R2 is hydrogen, alkyl or alkoxy, (2) coating the mixture onto a backing member, and (3) exposing the coated mixture to ultraviolet radiation.
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17. Method of making a pressure-sensitive adhesive tape comprising the steps of:
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(1) mixing by weight (a) 100 parts of an unpolymerized composition of 50-100 parts of alkyl acrylate and 0-50 parts of copolymerizable monoethylenically unsaturated monomer comprising polar groups, which composition is polymerizable to a pressure-sensitive adhesive state, and, (b) an addition-polymerization photoinitiator which is activatable by ultraviolet radiation, is not a crosslinking agent, and is dissolved in an amount providing 0.001 to 0.5 percent of the composition (a), (2) exposing the mixture to ultraviolet radiation to provide a partially-polymerized syrup having a viscosity of 300 to 20,000 centipoises at ordinary room temperature, (3) mixing with said syrup 0.01 to 2 parts of a polynuclear chromophore-substituted halomethyl-s-triazine of the formula ##STR12## wherein each of R1 and R2 is hydrogen, alkyl, or alkoxy, (4) coating said syrup onto a backing member to provide a layer having a thickness of about 25-250 micrometers, and (5) in an inert atmosphere, irradiating the coating with ultraviolet radiation to further polymerize it to a substantially completely polymerized, crosslinked, pressure-sensitive adhesive state. - View Dependent Claims (18)
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19. Method of making a crosslinkable pressure-sensitive adhesive tape comprising the steps of
(1) mixing by weight (a) a solution in an organic solvent of a polymer of (i) 88-99 part of alkyl acrylate having 4-12 carbon atoms in its alkyl group or alkyl acrylates having an average of 4-12 carbon atoms in their alkyl groups and (ii) correspondingly 12-1 parts of a copolymerizable monomer and (b) 0.01 to 2 parts of a polynuclear-chromophore-substituted halomethyl-s-triazine of the formula ##STR13## wherein each of R1 and R2 is hydrogen, alkyl, or alkoxy, (2) coating said mixture onto a flexible, opaque backing member to provide a layer having a thickness of about 25-250 micrometers, (3) driving off the solvent, and (4) winding the coated backing member on itself into roll form so that the backing member shields the coating from accidental exposure to ultraviolet radiation which would cause the polymer to become crosslinked.
Specification