Composition and process
AssigneeOwens-Illinois, Inc.
InventorsLynn J. Taylor, John W. Tobias
Life of this patent
Estimating the term…
Abstract
There are disclosed novel photodegradable polymeric or plastic compositions comprising at least one organic polymer or copolymer and at least two different aromatic carbonyl photosensitizers.
Claims10
As a composition of matter, a photodegradable polymeric composition comprising at least one thermoplastic organic polymer and at least two aromatic carbonyl photosensitizers present in amounts sufficient to accelerate the photodegradation of the resulting polymeric composition, at least one aromatic carbonyl photosensitizer having an ultraviolet absorption maximum in the range of 280 to 330 millimicrons and at least one other aromatic carbonyl photosensitizer having an ultraviolet absorption maximum in the range of 330 to 400 millimicrons, each of said aromatic carbonyl photosensitizers being present at a level of about 0.01 to 2.0 percent by weight.
A process for preparing a degradable polymeric material, which process comprises dispersing into a thermoplastic organic polymer at least two aromatic carbonyl photosensitizers in amounts sufficient to accelerate the photodegradation of the resulting polymeric composition, at least one aromatic carbonyl photosensitizer having an ultraviolet absorption maximum in the range of 280 to 330 millimicrons and at least one other aromatic carbonyl photosensitizer having an ultraviolet absorption maximum in the range of 330 to 400 millimicrons, the amount of each aromatic carbonyl photosensitizer dispersed in said thermoplastic organic polymer being in the range of about 0.01 to 2.0 percent by weight.
A process for degrading a thermoplastic organic polymer comprising dispersing into said polymer about 0.01 to 2.0% by weight of each of at least two aromatic carbonyl photosensitizers, at least one aromatic carbonyl photosensitizer having an ultraviolet absorption maximum in the range of 280 to 330 millimicrons and at least one other aromatic carbonyl photosensitizer having an utraviolet absorption maximum in the range of 330 to 400 millimicrons, and subjecting the resultant composition to ultraviolet radiation to degrade said polymer.
Dependencies are inferred from the claim text.