Coating processes – Foraminous product produced – Filter – sponge – or foam
Patent
1987-10-14
1989-06-06
Bell, Janyce
Coating processes
Foraminous product produced
Filter, sponge, or foam
4273855, B05D 500
Patent
active
048370541
ABSTRACT:
Thin film composite membranes comprising a thin active selective layer deposited from a solution onto a thicker porous non-selective support layer are disclosed. In particular, a thin film of polyurea/urethane is coated onto a microporous support substrate from a specific multi-component solvent system. Effective film thicknesses of less than 1 micron can be achieved, said thin films being virtually defect free. Asymmetric-composite membranes consisting of a thin active layer of polyurea/urethane on a microporous support substrate are useful for separating aromatics from saturates, especially under pervaporation or perstraction conditions.
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Allocca Joseph J.
Bell Janyce
Exxon Research and Engineering Company
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