Back to results
US 3,940,535 AGranted
Reversible moisture-vapor-absorptive sheet structures and process
AssigneeBASF SE
InventorsRudolf Gaeth, Roland Linke
Life of this patent
Estimating the term…
Abstract
Reversibly moisture-vapor-absorptive sheet materials and a process for their manufacture in which water-soluble polymers of vinyl ethers are combined with base materials and crosslinked thereon.
Claims9
A process for the manufacture of reversibly moisture-vapor-absorptive sheet material which comprises:
- a. applying an aqueous solution of a water-soluble vinyl ether polymer to a base material which is gas permeable;
- whereby said base material is impregnated with said aqueous solution;
- b. heating said impregnated base material sufficiently to cause said water soluble vinyl ether polymer to precipitate from said solution whereby said polymer is fixed in said base material;
- c. cross-linking said vinyl ether polymer;
- and
- d. drying said sheet material, the amount of water soluble vinyl ether polymer applied to said base in a) being sufficient to produce a final sheet material containing from 10 to 70% by weight of said polymer.
3 more elements
Dependencies are inferred from the claim text.