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US 5,328,654 AGranted
Orientation of never-dried molecular composite films
AssigneeThe Dow Chemical Company
InventorThuan P. Dixit
Life of this patent
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Abstract
Improved films that contain molecular composites or block copolymers of lyotropic liquid crystalline polymer and thermoplastic polymer can be made by the steps of: (1) washing a dope film, that contains a solvent and the molecular composite or block copolymer; (2) stretching the wet, never-dried film from Step (1) in at least one direction; and (3) drying the film from Step (2). The films have improved mechanical properties and can be used in structural applications.
Claims8
A process to make an improved film that contains either:
- (a) a molecular composite of lyotropic liquid crystalline polymer and thermoplastic polymer, or (b) a block copolymer having blocks of lyotropic liquid crystalline polymer and blocks of thermoplastic polymer, said process comprising the steps of:
- (1) contacting a dope film, that contains a solvent and the molecular composite or block copolymer, with a washing fluid under conditions such that substantially all of the solvent is removed from the film;
- (2) stretching the wet, never-dried film from Step (1) at least 10 percent in at least one direction;
- and
- (3) drying the film from Step (2).
2 more elements
Dependencies are inferred from the claim text.