Patent GB-781474-A (GB)
Title: Adhesive tapes
IPC: C09J7/50
Filed: 1954-07-21
Abstract: A primer for a pressure-sensitive adhesive tape having a backing of a hydrophilic material, e.g. regenerated cellulose or cellulose acetate, comprises the reaction product of 1 to 6 parts of broken-down elastomer and 1 part of one or more compounds of the formula <FORM:0781474/III/1> <FORM:0781474/III/2> wherein R1 and R11 each represent hydrogen, chlorine, or an alkyl or aralkyl radical containing not more than 8 carbon atoms, and may be the same or different.  Maleic acid derivatives specified are monochlor, dichlor, monoethyl, dimethyl, and beta-ethyl phenyl maleic anhydride. Elastomers specified are natural rubbers, polymers and copolymers of butadiene in which the diene consists of twenty per cent or more, and isoprene polymers and copolymers of similar unsaturation.  Organic peroxides, e.g. benzoyl, tertiary butyl, diacetyl, zinc and hydrogen peroxide, and cumene, paramenthane, and di-isopropyl benzene hydroperoxide, in an amount of 0.5-10 per cent based on the elastomer, may be used as catalysts.  A resinous material, e.g. a terpene or coumarone-indene resin, rosin or an ester thereof, or an ester, e.g. the borate, of hydroabietyl alcohol, in an amount of 5-25 per cent of the elastomer may be incorporated in the primer. Known adhesive compositions are specified.  The primer may be prepared by milling the elastomer until a fluid solution can be obtained by dissolving in a hydrocarbon solvent, e.g. toluene or heptane, and then refluxing a mixture of the broken-down elastomer and other ingredients in such a solvent.  The primer may be applied in such a solvent to form a coating having a weight of 0.01-0.25 oz./sq. yard. The adhesive is applied from a rubber solvent to form a coating having a weight of, e.g. 0.5-5 oz./sq. yard.ALSO:A primer for a pressure-sensitive adhesive tape having a backing of a hydrophilic material, e.g. regenerated cellulose or cellulose acetate, comprises the reaction product of 1-6 parts of broken-down elastomer and 1 part of one or more compounds of the formula: <FORM:0781474/IV (a)/1> or <FORM:0781474/IV (a)/2> wherein R1 and R11 each represent hydrogen, chlorine or an alkyl or aralkyl radical containing not more than 8 carbon atoms, and may be the same or different.  Maleic acid derivatives specified are monochlor, dichlor, monoethyl, dimethyl and beta-ethyl phenyl maleic anhydride.  Elastomers specified are polymers and copolymers of butadiene, e.g. with styrene or acrylonitrile, isoprene polymers and copolymers and polychloroprene. Organic peroxides, e.g. benzoyl, tertiary butyl, diacetyl, zinc and hydrogen peroxide, and cumene, paramenthane, and diisopropyl benzene hydroperoxide, in an amount of 0.5-10 per cent based on the elastomer, may be used as catalysts.  A resinous material, e.g. a terpene or coumarone-indene resin, rosin or an ester thereof, or an ester, e.g. the borate, of hydroabietyl alcohol, in an amount of 5-25 per cent of the elastomer may be incorporated in the primer.  The primer may be prepared by milling the elastomer until a fluid solution can be obtained by dissolving in a hydrocarbon solvent, e.g. toluene or heptane, and then refluxing a mixture of the broken-down elastomer and other ingredients in such a solvent.ALSO:A primer for a pressure sensitive adhesive tape having a backing of a hydrophilic material, e.g. regenerated cellulose or cellulose acetate, comprises the reaction product of 1-6 parts of broken down natural rubber and 1 part of one or more compounds of the formula:  <FORM:0781474/V/1> wherein R1 and R11 each represent hydrogen, chlorine, or an alkyl or aralkyl radical containing not more than 8 carbon atoms, and may be the same or different.  Maleic acid derivatives specified are monochlor, dichlor, mono-ethyl, dimethyl, and beta-ethyl phenyl maleic anhydride.  Organic peroxides, e.g. benzoyl, tertiary butyl, diacetyl, zinc and hydrogen peroxide, and cumene, paramenthane, and diisopropyl benzene hydroperoxide, in an amount of 0,5-10 per cent based on the rubber, may be used as catalysts.  A resinous material, e.g. a terpene or conmarone-indene resin, rosin or an ester thereof, or an ester, e.g. the borate, of hydroabietyl alcohol, in an amount of 5-25 per cent of the rubber may be incorporated in the primer. Known adhesive compositions are specified.  The primer may be prepared by milling the rubber until a fluid solution can be obtained by dissolving in a hydrocarbon solvent, e.g. toluene or heptane, and then refluxing a mixture of the broken down rubber and other ingredients in such a solvent.  The primer may be applied in such a solvent to form a coating having a weight of 0,01-0,25 oz./sq. yd. The adhesive is applied from a rubber solvent to form a coating having a weight of e.g. 0,5-5 oz./sq. yd.