Production of supported thin film membranes

Details Production of supported thin film membranes Production of supported thin film membranes

1989-12-19

1991-09-03

Lawrence, Evan

Coating processes

Foraminous product produced

Microporous coating

4273935, B05D 500

Patent

active

050453548

ABSTRACT:
Supported thin film membranes of polyurethane, polyurea/urethane, polyurea/polyurethane alloy blends are prepared by depositing a solution of the appropriate polymer on a microporous hydrophobic support. The solution wets but does not soak through the hydrophobic support because the amounts and ratios of solvents and surfactant used to produce the solution have been adjusted to produce a solution having optimum coating properties (for example, surface tension, solvency, viscosity). The solvent of the solution comprises a mixture of a low surface tension solvent and a high solvency solvent. The polymer solution is optionally aged at least 1 day prior to being coated on the microporous support.

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