C - Chemistry – Metallurgy – 09 – J
Patent
C - Chemistry, Metallurgy
09
J
217/193, 400/400
C09J 125/10 (2006.01) C09J 5/00 (2006.01) C09J 133/06 (2006.01)
Patent
CA 1331242
ABSTRACT This invention presents a series of synthetic based cold seal adhesives which are capable of forming strong bonds at room temperature, yet which may be reeled up without blocking and stored for extended periods of time. Such adhesives can be used in place of the natural rubber based cold seal adhesives currently used, and thus, can be employed in any packaging application where cold seal properties are desirable. The cold-seal adhesive composition comprises about 45 to 70% (by wt.) of a synthetic base polymer and about 30 to about 55% (by wt.) of a synthetic secondary polymer, wherein the base polymer comprises a synthetic polymer, a synthetic copolymer, or any mixture thereof characterized in that it possesses a Tg of about -40 to about -60°C and a Williams plasticity number of about 2.5 to about 2.9; and the secondary polymer comprises a styrene-acrylic copolymer, a synthetic styrene-acrylic resin or any mixture thereof, or an admixture of one or more styrene-acrylic copolymers or styrene-acrylic resins, or any mixture thereof with one or more synthetic polymers, copolymers, or synthetic resins, characterized in that it possesses a Tg of about -25 to about +5°C and a Williams plasticity number of about 5.0 to about 5.6.
595217
Causton Peter
Dust Richard A.
Borden Ladner Gervais Llp
National Starch And Chemical Corporation
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