Hindered amine light stabilizer hydrazides for stabilizing polyurethane, polyurea and polyurethane-polyurea polymers
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United States of America Patent
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Jul 21, 1992
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N/A
app pub date -
Jan 7, 1991
filing date -
Jan 7, 1991
priority date (Note) -
Expired
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Abstract
Stabilized polyurethanes, polyureas and polyurethane-polyurea polymers having hindered amine light stabilizers (HALS) bonded thereto by means of a hydrazide functionality attached to the HALS are provided. The synergistic effect of a second amide functional group in the HALS-hydrazide provides improved photostabilization efficiency as compared to HALS-hydrazides of the prior art.
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