Reduction in stress cracking of films
OwnerBeuford Arlie Bogue, Greg Slominskiinventors
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Abstract
Methods and packages for storing film strips while reducing or eliminating stress cracking during storage, including use of packages having an inner surface made from polymeric materials exhibiting various physical properties and including films and pouches that are annealed.
Claims43
A pouch for storing a film comprising:
- a laminate of at least one first layer and at least one second layer, and
- a cavity comprising a film which has been annealed to reduce stress-cracking of said film, said film comprising at least one polymer and at least one active,
- wherein said film exhibits less stress-cracking when annealed than when not annealed.
A method for reducing stress cracking in a film comprising:
(a) providing a film comprising at least one polymer and at least one active;
- (b) annealing the film to reduce stress-cracking of the film;
- wherein said film exhibits reduced stress cracking as a result of said annealing.
A method for reducing stress cracking in a film comprising a continuous and uniform product comprising the steps of:
- (a) preparing a film-forming matrix comprising a solvent, an active and a polymeric material;
- (b) casting said film-forming matrix and drying said film-forming matrix to form a dried film;
- and
- (c) annealing said dried film to relieve stresses imposed by the drying process.
A method for reducing stress cracking in a film comprising a continuous and uniform product comprising the steps of:
- (a) preparing a film-forming matrix comprising a solvent, an active and a polymeric material;
- (b) casting said film-forming matrix and drying said film-forming matrix to form a dried film;
- (c) packaging said dried film in a pouch to form a packaged film;
- and
- (d) annealing said pouched film to relieve stresses imposed by the drying process.
The method of claim 21, wherein the film is annealed at a temperature between 40 degrees C. and 90 degrees C.
The method of claim 21, wherein the film is annealed at a time between 0.5 minutes and 60 minutes
A continuous and uniform film product with reduced stress cracking, wherein said film product is formed by a process comprising:
- (a) casting a film-forming matrix comprising a solvent, an active and a polymeric material;
- (b) drying said film-forming matrix to form a dried film;
- and
- (c) annealing said dried film to relieve stresses imposed by the drying process to form a reduced stress cracked film.
A continuous and uniform film product with reduced stress cracking, wherein said product is formed by a process comprising:
- (a) casting a film-forming matrix comprising a solvent, an active and a polymeric material;
- (b) drying said film-forming matrix to form a dried film;
- (c) packaging said dried film in a pouch to form a packaged film;
- and
- (d) a annealing said pouched film to relieve stresses imposed by the drying process to form a reduced stress cracked film.
Dependencies are inferred from the claim text.