Patent ID: 7012032

Claim:
A seal for sealing a container opening, said seal comprising at least one tear resisting composite layer providing tear resistance to said seal the composite layer consisting of: a) an oriented polymer film layer having a top surface and a inner surface; b) a thermal bonding polymer layer on said oriented polymer layer inner surface substantially coextensive thereto, said thermal bonding polymer layer having a thickness between 10% and 40% of a combined thickness of the oriented polymer film layer and the thermal bonding polymer layer; and c) a reinforcing scrim polymer layer also having an inner surface adjacent and substantially coextensive with the thermal bonding polymer layer said reinforcing having a bottom surface; wherein the oriented polymer film layer, the thermal bonding polymer layer, and the reinforcing scrim polymer layer in said tear resisting composite layer each individually comprise a synthetic condensation polymer, the synthetic condensation polymers each comprising, in polymerized form: 1) a) a carboxylic acid or a mixture of carboxylic acids, and b) either i) a diamine or a mixture of diamines, or ii) a diol or a mixture of diols, or 2) an ω-amino acid having more than 2 carbon atoms, or a mixture of such amino acids, wherein, for the composite taken as a whole, at least 90 mol % of a combined total amount of the carboxylic acid or the mixture of carboxylic acids in the synthetic condensation polymers is the same carboxylic acid, at least 90 mol % of a combined total amount of the diamine or the mixture of diamines in the synthetic condensation polymers is the same diamine, at least 90 mol % of a combined total amount of the diols or the mixture of diols in the synthetic condensation polymers is the same diol, and at least 90 mol % of a combined total amount of the amino acid or the mixture of amino acids in the synthetic condensation polymers is the same amino acid.