Polymerization of polyol allyl carbonate using polymerization initiators of short and long half lives
AssigneePPG Industries, Inc.
InventorIvan R. Leatherman
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Abstract
Disclosed is a liquid composition of a polyol(allyl carbonate) monomer; a first, low initiation temperature, short half life, polymerization initiator; and, a second, high initiation temperature, long half life, polymerization initiator. Optionally, a photochromic agent may be present. Also disclosed is a method of polymerizing the composition, and the polymerizate prepared thereby.
Claims33
In a method of polymerizing a polyol(allyl carbonate) having a photochromic agent incorporated therein, which method comprises adding a first organic peroxide initiator to the polyol(allyl carbonate) monomer and curing the polyol(allyl carbonate), the improvement comprising adding from about 1 to about 10 moles of a second organic peroxide initiator per mole of photochromic agent to the polyol(allyl carbonate), said second organic peroxide initiator having a half life at least five times greater than the half life of the first organic peroxide initiator.
A liquid composition comprising a polyol bis(allyl carbonate), a photochoromic agent, a first organic peroxide initiator, and from about one to about ten moles of a second organic peroxide initiator per mole of photochromic agent, said second organic peroxide initiator having a half life at least five times longer than the half life of the first organic peroxide initiator.
A method of enhancing the recovery of an organic peroxide free radical initiated polyol(allyl carbonate) polymerizate having a photochromic agent incorporated therein, which method comprises adding from about one to about ten moles of a second organic peroxide free radical initiator per mole of photochromic agent to the composition of polyol(allyl carbonate) monomer, photochromic agent, and first organic peroxide free radical initiator, which second organic peroxide free radical initiator has a half life at least five times longer than the half life of the first organic peroxide free radical initiator.
In a method of polymerizing a polyol(allyl carbonate) having a photochromic agent incorporated therein, which method comprises adding a first organic peroxide initiator to the polyol(allyl carbonate) monomer and curing the polyol(allyl carbonate), the improvement comprising adding second and third organic peroxide initiators to the polyol(allyl carbonate), said second organic peroxide initiator having a half life at least five times longer than the half life of the first organic peroxide initiator, and said third organic peroxide initiator having a half life at least five times longer than the half life of said second organic peroxide initiator and being present at a concentration of about one to about ten moles per mole of photochromic agent.
A liquid composition comprising a polyol bis(allyl carbonate), a photochromic agent, a first peroxide initiator, a second peroxide initiator, and about one to ten moles of a third organic peroxide initiator per mole of photochromic agent, said second organic peroxide initiator having a half life at least about five times longer than the half life of the frist organic peroxide initiator, and said third organic peroxide initiator having a half life at least about five times longer than the half life of said second organic peroxide initiator.
A method of increasing the hardness and enhancing the photochromic recovery of an organic peroxide free radical initiated polyol(allyl carbonate) polymerizate having a photochromic agent incorporated therein, which method comprises adding second and third organic peroxide free radical initiators to the composition of polyol (allyl carbonate) monomer, photochromic agent, and first organic peroxide free radical initiator, which second free radical organic peroxide initiator has a half life at least about five times longer than the half life of the first free radical organic peroxide initiator, and which third free radical organic peroxide initiator has a half life at least about five times longer than the second free radical organic peroxide initiator, said third organic peroxide free radical initiator being present at a concentration of about one to about ten mole per moles of photochromic agent.
Dependencies are inferred from the claim text.