Stock material or miscellaneous articles – Composite – Of addition polymer from unsaturated monomers
Patent
1987-09-22
1991-05-28
Gallagher, John J.
Stock material or miscellaneous articles
Composite
Of addition polymer from unsaturated monomers
2167, 1062861, 1062862, 1062868, 156281, 1563093, 156325, 156629, 427322, B32B 2708
Patent
active
050194534
ABSTRACT:
A protective material comprising a layer of vinylidene chloride or copolymer of vinylidene chloride between two layers of polyethylene to provide protection against both permeation and breakthrough. A cloth backing or inner layer can be added to this material for comfort. The material can be modified with a reinforcing material such as fiberglass or scrim cloth. Inclusion of an indicator substance between layers, or impregnated in a layer, provides further protection by warning the user of permeation and breakthrough. This material can be utilized in protective clothing such as gloves, as enclosures for instruments and equipment, as a container, and in other applications. The material is preferably formed by first surface treating one or more layers of polyethylene and/or vinylidene chloride or saran with a solution comprising any hexavalent chromium compound such as a chromate or chromium trioxide in hydrogen ion such as supplied from sulphuric acid, and then pressing the layers of vinylidene chloride and polyethylene together under heat and pressure such as 330 degrees Fahrenheit at 400 PSI.
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