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 ultra violet 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≦3.00 after 2450 kilojoules of exposure.
Claims41
An improved light stable aliphatic based polyurethane elastomer comprising:
- (a) a hindered amine light stabilizer and a hindered phenol light stabilizer;
- (b) antioxidant;
- and
- (c) pigment;
- wherein the ratio of hindered amine to said hindered phenol stabilizer is in the range of about 1:1 to 2:1 and the concentration of components (a), (b) and (c) in said elastomer, based upon the entire product composition, are selected to provide a light stable elastomer following exposure to Xenon arc artificial weathering with a DE≦3.00 after 2450 kilojoules of output.
A light stable automotive trim component comprising a light stable aliphatic based polyurethane elastomer comprising:
- (a) a hindered amine light stabilizer and a hindered phenol light stabilizer;
- (b) antioxidant;
- and
- (c) pigment;
- wherein the ratio of hindered amine to said hindered phenol stabilizer is in the range of about 1:1 to 2:1 and concentration of components (a), (b) and (c) in said elastomer, based upon the entire product composition, are selected to provide a light stable elastomer following exposure to Xenon arc artificial weathering with a DE≦3.00 after 2450 kilojoules of output.
A method of fabricating an improved light stable aliphatic based polyurethane elastomer which comprises the steps of combining a polyol, a chain extender, and a polyfunctional isocyanate, along with
- (a) a hindered amine light stabilizer and a hindered phenol light stabilizer;
- (b) antioxidant;
- and
- (c) pigment
- wherein the ratio of hindered amine to said hindered phenol stabilizer is in the a range of about 1:1 to 2:1 and the concentration of components (a), (b) and (c) in said elastomer, based upon the entire product composition, are selected to provide a light stable elastomer following exposure to Xenon arc artificial weathering with a DE≦3.00 after 2450 kilojoules of output.
A thermoplastic microsphere said microspheres being spheroidal and having an outer diameter in the range of about 0.007″ to 0.040″, said thermoplastic microsphere comprising a light stable aliphatic based polyurethane elastomer formed by combining said aliphatic based polyurethane elastomer with:
- (a) a hindered amine light stabilizer and a hindered phenol light stabilizer;
- (b) antioxidant;
- and
- (c) pigment
- wherein the ratio of hindered amine to said hindered phenol stabilizer and the concentration of components (a), (b) and (c) in said aliphatic based polyurethane elastomer, based upon the entire product composition, are selected to provide a light stable elastomer following exposure to Xenon arc artificial weathering with a DE <3.00 after 2450 kilojoules of output.
Dependencies are inferred from the claim text.