Cold seal adhesives, cold sealable films and packages formed the

Details Cold seal adhesives, cold sealable films and packages formed the Cold seal adhesives, cold sealable films and packages formed the

1997-08-26

1999-11-09

Niland, Patrick D.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

4284231, 524492, 524493, 524839, 524840, 524858, C08J 300, C08K 320, C08L 7500, C08L 8300

Patent

active

059816503

ABSTRACT:
Cold-seal adhesives are disclosed that contain no natural rubber and are capable of forming dry coatings on flexible films which adhere to one another with commercially acceptable packaging strength at room temperature by pressure contact, but also allow such layered substrata to be reeled into rolls and stored for extended periods of time without blocking. The flexible films are usable in forming packages, particularly for comestibles and pharmaceuticals, without need for heat sealing. Such cold-seal adhesives are aqueous dispersions containing 30 to 55 percent of a polyurethane ionomer reaction product, having a T.sub.g of between about -50 to 10.degree. C., of a mixture of (a) a blend of between 0 and 40 percent polyester polyol and between 60 and 100 percent polyether polyol, (b) aliphatic diisocyanate and (c) dimethylol propionic acid and preferably containing 0.05 to 4 percent of grafted amorphous silica.

REFERENCES:
patent: 5396749 (1995-03-01), Fukushima
patent: 5616400 (1997-04-01), Zhang
patent: 5626950 (1997-05-01), Shimano et al.

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