Method of bonding with adhesive and adhesive containing an indicator

Claim 1

A METHOD FOR BONDING SURFACES TOGETHER COMPRISING THE STEPS OF PROVIDING A MIXTURE OF HEAT FUSIBLE SUBSTANTIALLY SOLVENT-FREE RESIN ADHESIVE PARTICLES AND FINELY DIVIDED COLORING MATERIAL WHICH WILL RETAIN ITS COLORING ABILITY AT THE TEMPERATURE TO WHICH THE ADHESIVE COMPOSITION IS SUBJECTED IN USE AND WHICH IS COMPATIBLE WITH SAID ADHESIVE UNIFORMLY DISTRIBUTED THROUGH THE MASS OF PARTICLES, SAID PARTICLES AND COLORING MATERIAL BEING IN PHYSICALLY DISTINCT BUT CLOSELY ADJACENT SPACES, SAID MIXTURE BEING OPAQUE AND MASKING THE PRESENCE OF SAID COLORING MATERIAL THROUGH DIFFRACTION OF INCIDENT LIGHT BY THE SURFACES OF THE ADHESIVE PARTICLES, DIRECTING AGAINST A FIRST SURFACE TO BE BONDED A STREAM OF HEATED GAS AND ENTRAINED PARTICLES OF SAID MIXTURE, SOFTENING SAID ADHESIVE PARTICLES BY SAID HEATED GAS, DEPOSITING HEAT SOFTENED PARTICLES FROM SAID GAS STREAM AS AN ADHERENT, WHITISH,, DIFFICULTY OBSERVABLE LAYER ON SAID FIRST SURFACE, FUSING THE PARTICLES OF RESIN ADHESIVE IN SAID LAYER BY DIRECTING HEATED GAS AT THE LAYER TO CONVERT THE RESIN ADHESIVE INTO A FLUID IN WHICH INDIVIUAL PARTICLES HAVE MERGED TO ELIMINATE INTERNAL AND EXTERNAL LIGHT DIFFRACTING SURFACES OF SAID PARTICLES AND THE COLORING MATERIAL IS NO LONGER MASKED BY DIFFRACTING PARTICLE SURFACES BUT COLORS THE FLUID TO RENDER ITS POSITION READILY PERCEPTIBLE AND TO INDICATE THAT THE ADHESIVE HAS BEEN HEAT SOFTENED TO BOND FORMING CONDITION, PRESSING A SECOND SURFACE AGAINST SAID ADHESIVE LAYER TO FORCE THE HEAT SOFTENED MATERIAL INTO INTIMATE CONTACT WITH BOTH OF SAID SURFACES, AND SOLIDIFYING THE ADHESIVE.

Claim 2

A METHOD FOR BONDING SURFACES TOGETHER COMPRISING THE STEPS OF PROVIDING A MIXTURE OF HEAT FUSIBLE SUBSTANTIALLY SOLVENT-FREE RESIN ADHESIVE PARTICLES AND FINELY DIVIDED COLORING MATERIAL WHICH WILL RETAIN ITS COLORING ABILITY AT THE TEMPERATURE TO WHICH THE ADHESIVE COMPOSITION IS SUBJECTED IN USE AND WHICH IS COMPATIBLE WITH SAID ADHESIVE UNIFORMLY DISTRIBUTED THROUGH THE MASS OF PARTICLES, SAID PARTICLES AND COLORING MATERIAL BEING IN PHYSICALLY DISTINCT BUT CLOSELY ADJACENT SPACES, SAID MIXTURE BEING OPAQUE AND MASKING THE PRESENCE OF SAID COLORING MATERIAL THROUGH DIFFRACTION OF INCIDENT LIGHT BY THE SURFACES OF THE ADHESIVE PARTICLES, DIRECTING AGAINST A FIRST SURFACE TO BE BONDED A STREAM OF HEATED GAS AND ENTRAINED PARTICLES OF SAID MIXTURE, SOFTENING SAID ADHESIVE PARTICLES BY SAID HEATED GAS, DEPOSITING HEAT SOFTENED PARTICLES FROM SAID GAS STREAM AS AN ADHERENT, WHITISH,, DIFFICULTY OBSERVABLE LAYER ON SAID FIRST SURFACE, FUSING THE PARTICLES OF RESIN ADHESIVE IN SAID LAYER BY DIRECTING HEATED GAS AT THE LAYER TO CONVERT THE RESIN ADHESIVE INTO A FLUID IN WHICH INDIVIUAL PARTICLES HAVE MERGED TO ELIMINATE INTERNAL AND EXTERNAL LIGHT DIFFRACTING SURFACES OF SAID PARTICLES AND THE COLORING MATERIAL IS NO LONGER MASKED BY DIFFRACTING PARTICLE SURFACES BUT COLORS THE FLUID TO RENDER ITS POSITION READILY PERCEPTIBLE AND TO INDICATE THAT THE ADHESIVE HAS BEEN HEAT SOFTENED TO BOND FORMING CONDITION, PRESSING A SECOND SURFACE AGAINST SAID ADHESIVE LAYER TO FORCE THE HEAT SOFTENED MATERIAL INTO INTIMATE CONTACT WITH BOTH OF SAID SURFACES, AND SOLIDIFYING THE ADHESIVE.