Composite pressure sensitive adhesive
AssigneeAvery Dennison Corporation
InventorsPrem Krish, Li Xie, Tamara L. McCartney
Life of this patent
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Abstract
This invention relates to a composite pressure sensitive adhesive composition comprising at least one first pressure sensitive adhesive material in the form of at least one continuous phase, and at least one second pressure sensitive adhesive material in the form of at least one discontinuous phase, said discontinuous phase being dispersed in said continuous phase. The invention also relates to a laminate having a composite pressure sensitive adhesive composition overlying the surface of a substrate, and to a process for making the foregoing laminate. The laminates can be used in making labels, tapes, and the like.
Claims12
A process for forming a composite pressure sensitive adhesive on the surface of a substrate, comprising:
- (A) depositing a discontinuous layer of a pressure sensitive adhesive material on said substrate, said pressure sensitive adhesive material being in the form of a hot melt adhesive, solution or emulsion, said discontinuous layer of said pressure sensitive adhesive material covering parts of said substrate and leaving parts of said substrate exposed;
- and
- (B) depositing a continuous layer of another pressure sensitive adhesive material on said discontinuous layer of said pressure sensitive adhesive material from step (A) and on the exposed parts of said substrate using proximity coating or non-contact coating;
- said discontinuous layer from step (A) being in the form of a hot melt adhesive, solution or emulsion during step (B);
- said another pressure sensitive adhesive material being in the form of a hot melt adhesive, solution or emulsion during step (B);
- said adhesive materials used during steps (A) and (B) being sufficiently non-soluble relative to each other so that at least about 50% by weight of said pressure sensitive adhesive material from step (A) remains in said discontinuous layer.
A process for forming a composite pressure sensitive adhesive on the surface of a substrate, comprising:
- (A) depositing a continuous layer of a pressure sensitive adhesive material on said substrate, said pressure sensitive adhesive material being in the form of a hot melt adhesive, solution or emulsion;
- and
- (B) depositing a discontinuous layer of another pressure sensitive adhesive material on the continuous layer of said pressure sensitive adhesive material from step (A) using non-contact coating;
- said pressure sensitive adhesive material from step (A) being in the form of a hot melt adhesive, solution or emulsion during step (B);
- said another pressure sensitive adhesive material being in the form of a hot melt adhesive, solution or emulsion during step (B);
- said pressure sensitive adhesive material from step (A) and said another pressure sensitive adhesive material from step (B) being sufficiently non-soluble relative to each other so that at least about 50% by weight of said pressure sensitive adhesive material from step (B) remains in said discontinuous layer.
Dependencies are inferred from the claim text.