Elastomeric film
AssigneeE. I. Du Pont de Nemours and Company
InventorTibor G. Mahr
Life of this patent
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Abstract
Ethylene/vinyl acetate copolymer film containing 35 to 50 percent copolymerized vinyl acetate by weight is irradiated with 0.5 to 16 megarads of high energy radiation, contacted with an alcoholic solution of a titanate or silane coupling agent, and subsequently contacted with an alcoholic finely divided mineral particulate slurry. The resulting film is elastomeric, heat sealable, transparent upon relaxation after being stretched and free of surface tack.
Claims4
A process for treating ethylene/vinyl acetate copolymer film containing about 35 to 50 percent copolymerized vinyl acetate by weight, said ethylene/vinyl acetate being crosslinked as a result of being subjected to a 0.5 to 16 megarad dosage of high energy radiation, comprising:
- (a) contacting the film with an alcoholic solution, at 20.degree.-80.degree. C., containing at least 0.2 percent of a coupling agent selected from the group consisting of titanate and silane coupling agents so that the coupling agent is bonded to the surface of the film;
- and then
- (b) contacting the film of (a) with an alcoholic slurry containing at least 0.2 percent finely divided mineral particulates so that the mineral particles are bonded to the coupling agent.
Dependencies are inferred from the claim text.