Light stable aliphatic thermoplastic urethane elastomers and method of making same
AssigneeDavidson Textron Inc.
InventorsWilliam M. Humphrey, Victor E. Gerard
Life of this patent
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Abstract
An improved light stable polyether/polyol based aliphatic urethane thermoplastic elastomer prepared from reacting inter alia a polyol having low terminal end unsaturation and an organic diisocyanate. The elastomer is characterized by ultraviolet stabilizer being present in a range of 0.25% to 2.0% at a total concentration of 1.0% to 2.0%, an antioxidant being present at a total concentration of 0.10% to 1.0%, and colorants/pigment being present in a total concentration in a range from 1.0% to 2.05% to produce an elastomer capable of withstanding Xenon arc artificial weathering with DE.ltoreq.3.00 after 2450 kilojoules of exposure.
Claims26
An improved light stable polyether/polyol based aliphatic thermoplastic urethane elastomer, said elastomer comprising the product of:
- (a) a polyol;
- (b) a chain extender;
- (c) an organic diisocyanate;
- (d) a first hindered amine light stabilizer and a second benzotriazole ultraviolet stabilizing agent;
- (e) an antioxidant;
- (f) at least one pigment;
- (g) a urethane catalyst;
- and characterized by said first and second ultraviolet stabilizing agents being present in a ratio in a range of approximately 1:1 to 2:1 at a concentration in a range of approximately 0.25% to 2.0% of entire product composition, said antioxidant being present at a total concentration in a range of approximately 0.10% to 1.0% of entire product composition and said pigment being present at a total concentration in a range of approximately 1.0% to 2.0%, whereby said elastomer is light stable following exposure to a Xenon arc artificial weathering with a DE.ltoreq.3.00 after 2450 kilojoules of output.
A light stable automotive trim component, said component comprising the product of:
- (a) a polyol;
- (b) a chain extender;
- (c) an organic diisocyanate;
- (d) a first hindered amine light stabilizer and a second benzotriazole ultraviolet stabilizing agent;
- (e) an antioxidant;
- (f) at least one pigment;
- (g) a urethane catalyst;
- and characterized by said first and second ultraviolet stabilizing agents being present in a ratio in a range of approximately 1:1 to 2:1 at a concentration in a range of aproximately 0.25% to 2.0% of entire product composition, said antioxidant being present at a total concentration in a range of approximately 0.10% to 1.0% of entire product composition, and said pigment being present at a total concentration in a range of approximately 1.0% to 2.0% of entire product composition, whereby said elastomer is light stable following exposure to Xenon arc artificial weathering with a DE.ltoreq.3.00 after 2450 kilojoules of output.
Dependencies are inferred from the claim text.