초록 ▼

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% a

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.

대표청구항 ▼

[ We claim:] [1.] 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 stab

[ We claim:] [1.] 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.