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US 4,360,623 AGranted
Alkali metal borohydride concentrate useful as a stability improver
AssigneeThiokol Corporation
InventorsRobert C. Wade, Lawrence J. Guilbault, Nuno M. Rei
Life of this patent
Estimating the term…
Abstract
Concentrates containing from 0.5% to 20% by weight of an alkali metal borohydride, balance essentially inert dry resinous polymer are added to plastics in amounts effective to reduce traces impurities and thereby result in improved heat and light stability.
Claims7
A process for purifying plastic during processing to enhance resistance to deterioration caused by heat or light, comprising:
- adding an effective amount of a stable, substantially inert, alkali metal borohydride concentrate consisting essentially of from about 0.5% to 20% by weight alkali metal borohydride, less than about 0.1% adsorbed water, balance essentially dry inert resinous polymer to a plastic during processing of said plastic so as to reduce trace impurities contained in said plastic that cause deterioration of said plastic due to heat or light to a level effective to improve heat or light stability of said plastic.
Dependencies are inferred from the claim text.