Method of coupling wireless portable communications device to electronicmail server by public wireless communications network when out of communication with private wireless communications

Abstract

One-component adhesives/sealants comprising surface-deactivated solid polyisocyanates and, optionally, isocyanate-reactive, liquid binders can be rapidly cured below the conventional thickening temperature by irradiating with microwaves, for example microwaves of at least 2 wavelengths. This process is particularly suitable for adhesively joining plastic substrates.

1 . A process for curing a one-component adhesive/sealant comprising at least one surface-deactivated solid polyisocyanate, said process comprising exposing the adhesive/sealant to microwave radiation, wherein the adhesive/sealant is heated to a material temperature below the thickening temperature.  
   
   
       2 . A process according to  claim 1 , wherein immediately after the end of the microwave irradiation, the adhesive/sealant has a material temperature between 40° C. and 120° C.  
   
   
       3 . A process according to  claim 1 , wherein immediately after the end of the microwave irradiation, the adhesive/sealant has a material temperature between 50° C. and 70° C.  
   
   
       4 . A process according to  claim 1 , wherein the adhesive/sealant is simultaneously irradiated with microwaves of at least two wavelengths.  
   
   
       5 . A process according to  claim 4 , wherein the at least two wavelengths of the microwaves are generated by switching on microwave producing microwave sources.  
   
   
       6 . A process according to  claim 5 , wherein the switching on is periodic.  
   
   
       7 . A process according to  claim 1 , wherein the energy of the microwaves is controlled as a function of the resulting adhesive/sealant temperature and/or the state of cure of the adhesive/sealant.  
   
   
       8 . A process according to  claim 1 , wherein the adhesive/sealant is on a substrate and the substrate is successively conveyed through a plurality of zones that are irradiated with microwaves having an identical fundamental frequency and which are modulated with at least two different modulation frequencies.  
   
   
       9 . A process in accordance with  claim 8 , wherein said identical fundamental frequency is about 2.5 Gigahertz.  
   
   
       10 . A process in accordance with  claim 8 , wherein said at least two different modulation frequencies are selected from the group consisting of about 1.2 Gigahertz, about 1.6 Gigahertz, about 1.9 Gigahertz, about 2.1 Gigahertz, about 2.5 Gigahertz and about 3 Gigahertz.  
   
   
       11 . A process according to  claim 1 , wherein the at least one surface-deactivated polyisocyanate has a melting point above 40° C.  
   
   
       12 . A process according to  claim 1 , wherein the polyisocyanate is selected from diphenylmethane-4,4′-diisocyanate (MDI), naphthalene-1,5-diisocyanate (NDI), 3,3′-dimethyl-biphenyl-4,4′-diisocyanate (TODI), dimeric 1-methyl-2,4-phenylene diisocyanate (TDI-U), 3,3′-diisocyanato-4,4′-dimethyl-N,N′-diphenylurea (TDIH), the isocyanurate of IPDI (IPDI-T) or the addition product of 2 moles 1-methyl-2,4-phenylene diisocyanate with 1 mole 1,2-ethanediol, 1,4-butanediol, 1,4-cyclohexanedimethanol or ethanolamine.  
   
   
       13 . A process according to  claim 1 , wherein the at least one surface-deactivated polyisocyanate is produced by dispersing a powdered polyisocyanate in a solution or dispersion of at least one deactivation agent.  
   
   
       14 . A process according to  claim 13 , wherein at least one low molecular weight liquid polyamine, polyamidoamine, polyoxyalkyleneamine, aminoalkyl alkoxysilane is employed as said at least one deactivation agent.  
   
   
       15 . A process according to  claim 1 , wherein the adhesive/sealant is additionally comprised of at least one hydroxy-functional natural oil and/or hydroxy-functional polyene selected from hydroxy-functional polybutadienes, hydroxy-functional polyisoprenes, hydroxy-functional copolymers of butadiene, isoprene and styrene, or hydrogenated products thereof.  
   
   
       16 . A process in accordance with  claim 1 , wherein said at least one surface-deactivated polyisocyanate is in the form of a powder having an average particle size of 10 μm or less.  
   
   
       17 . A process in accordance with  claim 1 , wherein said adhesive/sealant is additionally comprised of at least one polyol selected from the group consisting of polyether polyols, polyester polyols, polyacrylate polyols, polyolefin polyols and polyether ester polyols.  
   
   
       18 . A process in accordance with  claim 1 , wherein said adhesive/sealant is additionally comprised of at least one amine selected from the group consisting of polyether amines and substituted aromatic diamines.  
   
   
       19 . A process for adhesively joining a first plastic substrate and a second plastic substrate using a one-component adhesive/sealant comprising at least one surface-deactivated solid polyisocyanate, said process comprising curing the adhesive/sealant by exposing the adhesive/sealant to microwave radiation, wherein the adhesive/sealant is heated to a material temperature below the thickening temperature.  
   
   
       20 . A process in accordance with  claim 19 , wherein the first plastic substrate and second plastic substrate are headlight components.  
   
   
       21 . A process in accordance with  claim 19 , wherein said adhesive/sealant is dispensed onto a surface of at least one of said first plastic substrate or said second plastic substrate using a dispensing device conveyed on an arm of a robot and wherein a microwave emitter conveyed on said arm of said robot is used as a source of the microwave radiation.