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Solidified Coating in Jar 

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* A is unstabilized. 

B contains 2% by weight of bis(l-octyloxy-2,2,6,6-tetramethylpiperidin-4- yl) sebacate (TINUVIN fi 123). C contains 2% by weight of bis[l-(2-hydroxy-2-methylpropoxy)-2,2,6,6- 

tetramethylpiperidin-4-yl] sebacate, compound of Example 2. 

These data show that the instant compound having a hydroxy moiety present on the group attached to the 1-position of the hindered amine provides excellent solubil- ity and compatibility for the polyester urethane coating that cannot be achieved with the closest prior art compound where said hydroxy moiety is absent. 

1-(2-H ydroxy-2-methylpropoxy )-4-[9-( methoxy› carbony l)nonanoy loxy ]-2,2,6,6- tetramethylpiperidine 

The title compound is prepared by the reaction of the compound prepared in Example 16A with one equivalent or more of dimethyl sebacate and a catalytic amount of lithium amide in xylene. 

1-(2-Hydroxy-2-methylpropoxy)-4-[5-(methoxy› carbonyl)pentanoyloxy ]-2,2,6,6- tetramethylpiperidine 

The title compound is made by the procedure of Example 101 where dimethyl sebacate is replaced by an equivalent amount of dimethyl adipate. 

1-(2-H ydroxy-2-methylpropoxy )-4-[3-( methoxy› carbony l)propiony loxy ]-2,2,6,6- tetramethylpiperidine 

The title compound is made by the procedure of Example 101 where dimethyl sebacate is replaced by an equivalent amount of dimethyl succinate. 

l-(2-Hydroxy-2-methylpropoxy)4-[ 4-(methoxy› carbonyl)butyryloxy ]-2,2,6,6-tetramethylpiperidine 

The title compound is made the procedure of Example 101 where dimethyl sebacate is replaced by an equivalent amount of dimethyl glutarate. 

Condensation Product of 4-Hydroxy-l-(2-hydroxy- 2-methylpropoxy)-2,2,6,6-tetramethylpiperidine with Hexamethylene Diisocyanate, and Terminated with Methoxy 

The title compound is prepared from the reaction of approximately equimolar amounts of the compound pre- pared in Example 16A with hexamethylene diisocyanate followed by reaction with excess methanol. 

## EXAMPLE 101 

## EXAMPLE 102 

## EXAMPLE 103 

## EXAMPLE 104 

## EXAMPLE 105 

Condensation Product of 4-Hydroxy-l-(2- hydroxyethoxy)-2,2,6,6-tetramethylpiperidine with Hexamethylene Diisocyanate, and Terminated with Methoxy 

The title compound is prepared from the reaction of approximately equimolar amounts of the compound pre- pared in Example 70 with hexamethylene diisocyanate, followed by reaction with excess methanol. 

Condensation Product of 4-Hydroxy-1-(2-hydroxy› l-phenethoxy )-2,2,6,6-tetramethy lpiperidine with Hexamethylene Diisocyanate, and Terminated with Methoxy 

The title compound is prepared from the reaction of approximately equimolar amounts of the compound pre› pared in Example 74 with hexamethylene diisocyanate, followed by reaction with excess methanol. 

The hindered amine test stabilizers are incorporated into a two-component acrylic urethane coating as described om Example 99. The system is catalyzed with 0.02% by weight of dibutyltin dilaurate based on the total resin solids. The stabilizers are added at the appropriate level to the acrylic polyol portion of the two-component coating which is then combined with the isocyanate component immediately prior to application. 

Steel panels 3"x4" primed with an electrocoat primer are then coated with a light blue metallic basecoat, then with the stabilized clearcoat. The basecoat is spray applied to a thickness of 1.0 mil (25 microns) dry film thickness and the stabilized clearcoat is then applied to a thickness of 2.0 mils (50 microns) dry film thickness. The coating is air-dried and aged for two weeks. The panels are then exposed in a Xenon-Arc Weather-Ometer under the following conditions: 

Cam 180 cycle: 40 minutes light only; 20 minutes light and front spray; 60 minutes light only; 60 minutes dark and rear spray condensate. 

Lamp filters are: quartz inner/borosilicate S outer. 

Irradiance: 0.45 watts per square meter. 

20° Gloss is measured before exposure and at 500 hour intervals during exposure. Higher gloss retention is desir› able. 

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Stabilization of a Two-Component Acrylic Urethane Clearcoat 

## EXAMPLE 106 

## EXAMPLE 107 

## EXAMPLE 108 

