Plastic components of improved hardness and scratch resistance
AssigneeCorning Glass Works
InventorsAnton A. Spycher, Dennis J. Damico
Life of this patent
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Abstract
Low hardness and scratch resistance in direct-cast diethylene glycol bis(allyl carbonate) (CR-39.RTM. plastic surface laminae in glass-plastic lenses are analyzed and new plastic formulations, preferably comprising the monomer catalyzed with a mixed isopropyl percarbonate-benzoyl peroxide polymerization catalyst, are disclosed, offering improved hardness and scratch resistance for laminated lenses and also for CR-39.RTM. plastic articles generally.
Claims7
A glass plastic laminated article comprising at least one direct-cast diethylene glycol bis(allyl carbonate) plastic surface element bonded to a glass element by a polymeric bonding layer, wherein the plastic surface element exhibits a Barcol hardness of at least about 77 at all regions spaced 1 mm or greater from the polymeric bonding layer, said plastic surface element having been polymerized from a monomer-catalyst mixture including, as the catalyst, 1-9% of isopropyl percarbonate, 0.5-6% of benzoyl peroxide, and 3.5-13% total of isopropyl percarbonate and benzoyl peroxide by weight.
A method for providing a polymerized diethylene glycol bis(allyl carbonate) plastic article or element exhibiting enhanced scratch resistance and hardness which comprises polymerizing a mixture consisting essentially of diethylene glycol bis(allyl carbonate) monomer and a polymerization catalyst consisting essentially of a combination of isopropyl percarbonate and benzoyl peroxide, said mixture including 1-9% of isopropyl percarbonate, 0.5-6% of benzoyl peroxide, 3.5-13% total of isopropyl percarbonate and benzoyl peroxide, and the remainder diethylene glycol bis(allyl carbonate) by weight.
A method for providing a polymerized diethylene glycol bis(allyl carbonate) plastic article or element exhibiting enhanced scratch resistance and hardness which comprises polymerizing a mixture consisting essentially of diethylene glycol bis(allyl carbonate) monomer and a polymerization catalyst consisting essentially of a combination of isopropyl percarbonate and benzoyl peroxide, said mixture including 0.5-1.5% isopropyl percarbonate, 5.5-6% of benzoyl peroxide, and the remainder diethylene glycol bis(allyl carbonate) by weight.
Dependencies are inferred from the claim text.