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AssigneeExxon Research & Engineering Co.
InventorsCharles P. O'Farrell, John J. Higgins
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Adhesive contact cements of sulfonated olefinically unsaturated elastomers (sulfobutyl rubber) containing from about 0.1 to about 5.0 mol % SO.sub.3 H neutralized, partially neutralized, or unneutralized, are admixed with tackifiers, i.e. phenolformaldehyde resins, polyisobutylene, alkylphenol formaldehyde resins, petroleum resins, etc. in an amount of between about 5 and about 90 phr in between about 10 and about 50 wt. % solids concentration in organic solvents. These cements are used for adhering porous or non-porous materials such as textiles, wood, cloth, sheets or strip of metals, plastics, etc. to each other. High green strength, high tensile strength, high resistance to peel, even at elevated temperatures, water impermeability, etc. characterize such adhesive layers in laminates. A preferred solvent, 90% toluene, 10% isopropyl alcohol is used in compounding the cement and preferably an organic amine, e.g. ethylamine, is used to partially or completely neutralize the sulfonated elastomer although inorganic bases may also be used for neutralization.
A liquid adhesive elastomeric contact cement composition consisting of a sulfo derivative of an olefinically unsaturated butyl rubber having a viscosity average molecular weight of about 100,000 to about 450,000 containing between about 0.1 and about 5.0 mole percent of sulfo groups, and, as a tackifier, between about 5 and about 90 parts by weight of at least one organo thermoplastic resin having a softening or melting point of above 50.degree. C., per hundred parts by weight of butyl rubber, dissolved in an organic solvent or mixture of organic solvents, said cement composition containing about 10 to about 50 weight % solids, said solvent or solvents being sufficiently volatile to substantially all evaporate at ambient temperatures and pressures.
Dependencies are inferred from the claim text.