Laminating compositions and uses
AssigneePetrolite Corporation
InventorGeorge E. Unmuth
Life of this patent
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Abstract
A composition useful in lamination, the process of applying this composition, and the resulting laminated structure. This composition comprises (1) a microcrystalline-type wax, for example melting from about 140.degree.-200.degree. F (2) a resin, for example petroleum polymer resins, terpene polymer resins, rosin and rosin esters, having a molecular weight of about 800 to 2,000 and (3) atactic polypropylene. The composition comprises about 20-40% of atactic polypropylene; about 10-25% of polymer resin; the balance (30-70%) being microcrystalline wax. This composition is applied and the plys joined together at a temperature above about 225.degree. F to yield a laminated structure having optimum properties, particularly excellent hot peeling strength.
Claims12
The process of laminating two plys to each other which comprises applying a composition consisting essentially of
- 1. about 20-40% by weight of atactic polypropylene having a solid density at 20.degree. C. from 0.75 to 0.89,
- 2. about 10-25% by weight of a resin selected from the group consisting of petroleum polymer resins produced by treating hydrocarbon mixtures containing diolefins, olefins, aromatics, paraffins and naphthenes with an aluminum halide catalyst at temperatures from -30.degree. to +75.degree. C., terpene polymer resins, rosin resins, rosin ester resins, coumarone-indene, alpha methyl styrene/vinyl toluene, styrene-indene-isoprene terpolymers, terpene phenolics, hydroabietyl alcohol and esters of hydroabietyl alcohol, and
- 3. microcrystalline wax as the balance by weight to one or both plys at a temperature above 225.degree. F. and joining said plys at a temperature above about 225.degree. F. and allowing the joined plys to cool, the resulting laminated structure having good laminating strength at high temperatures.
Dependencies are inferred from the claim text.