Curable film forming compositions

Claim 1

A pressure-sensitive adhesive consisting essentially of a free radical cured mixture containing at least 15 parts by weight of at least one unsaturated elastomeric polymer and at least one tackifying organic additive which is substantially non-responsive to the action of free radicals and selected from the group consisting of saturated aromatic resins, aromatic resins which are at least 50% saturated, saturated aliphatic resins, aliphatic resins in which at least 65% of the unsaturated groups in the resin as formed in saturated or made non responsive to the action of free radicals and saturated oils, said additive present in an amount sufficient to modify the properties of the cured elastomeric polymer, said cured adhesive pressure-sensitive formed in the absence of a non elastomeric cross-linker having a glass transition temperature at least 10° C. below use temperature and an elevated temperature shear higher than the elevated temperature shear prior to cure, said mixture when at a proportion of 40 parts by weight elastomeric polymer and 60 parts by weight organic additive having relative incipient gel dosage of cure of no more than about 1.65 at an electron beam radiation level of 200 kv.