Heat-fusible pastes for printing inks, adhesives and moldings
AssigneeHercules Incorporated
InventorRobert M. Walsh
Life of this patent
Estimating the term…
Abstract
It has been discovered that pastes of particulate thermoplastic polymers dispersed in a soft resinous phase can be prepared which heat-set by fusion of the thermoplastic binder. Polystyrene-type and polyacrylate-type polymers have been found to be particularly useful. When pigmented or otherwise colored, these formulations have utility as printing inks. When uncolored, they can be used as clear overprint coatings. In addition, these fusible pastes have utility as specialty coatings in adhesives and can be fabricated into self-supporting shapes.
Claims17
A composition of matter in paste form comprising discrete solid particles of a glassy thermoplastic polymeric material, said polymeric material having been prepared from at least 51% of at least one monomer selected from the group consisting of acrylate-type monomers and monovinylidene aromatic monomers, said polymeric material having a glass transition temperature of at least about 50.degree. C., and a particle diameter between about 0.05 micron and about 50 microns, said discrete solid particles of polymeric material being dispersed in a tackifying, cohesion-increasing material whose softening point is at or below room temperature, said polymeric material and said cohesion-increasing material being present in said composition in a ratio of polymeric material to cohesion-increasing material of between about 1:6 to about 1:1.
A printing ink in paste form comprising (1) a colorant, (2) discrete solid particles of a glassy thermoplastic polymeric material, said polymeric material having been prepared from at least 51% of at least one monomer selected from the group consisting of acrylate-type monomers and monovinylidine aromatic monomers, said polymeric material having a glass transition temperature of at least about 50.degree. C. and a particle diameter between about 0.05 micron and about 50 microns, and (3) a tackifying cohesion-increasing material whose softening point is at or below room temperature, said polymeric material and said cohesion-increasing material being present in said printing ink in a ratio of polymeric material to cohesion-increasing material of between about 1:6 to about 1:1.
An adhesive composition in paste form comprising discrete solid particles of a glassy thermoplastic polymeric material, said polymeric material having been prepared from at least 51% of at least one monomer selected from the group consisting of acrylate-type monomers and monovinylidene aromatic monomers, said polymeric material having a glass transition temperature of at least about 50.degree. C., and a particle diameter between about 0.05 micron and about 50 microns, said discrete solid particles of polymeric material being dispersed in a tackifying, cohesion-increasing material whose softening point is at or below room temperature, said polymeric material and said cohesion-increasing material being present in said composition in a ratio of polymeric material to cohesion-increasing material of between about 1:6 to about 1:1.
A molding material composition in paste form comprising discrete solid particles of a glassy thermoplastic polymeric material, said polymeric material having been prepared from at least 51% of at least one monomer selected from the group consisting of acrylate-type monomers and monovinylidene aromatic monomers, said polymeric material having a glass transition temperature of at least about 50.degree. C., and a particle diameter between about 0.05 micron and about 50 microns, said discrete solid particles of polymeric material being dispersed in a tackifying, cohesion-increasing material whose softening point is at or below room temperature, said polymeric material and said cohesion-increasing material being present in said composition in a ratio of polymeric material to cohesion-increasing material of between about 1:6 to about 1:1.
A process comprising printing onto the surface of a substrate a composition in paste form comprising (1) a colorant, (2) discrete solid particles of a glassy thermoplastic polymeric material, said polymeric material having been prepared from at least 51% of at least one monomer selected from the group consisting of acrylate-type monomers and monovinylidene aromatic monomers, said polymeric material having a glass transition temperature of at least about 50.degree. C. and a particle diameter between about 0.05 micron and about 50 microns, and (3) a tackifying cohesion-increasing material whose softening point is at or below room temperature, said polymeric material and said cohesion-increasing material being present in said composition in a ratio of polymeric material to cohesion-increasing material of between about 1:6 to about 1:1 and heating the printed surface of the substrate for a length of time at a temperature sufficient to fuse the composition.
Dependencies are inferred from the claim text.