Polyurea-polyurethane composite structure substantially free of volatile organic compounds

A composite structure comprising:

• (A) a first-layer substantially free of volatile organic compounds, said first-layer comprising a polyurea and at least one UV performance enhancing additive wherein said first-layer is a show surface of the composite structure and has a Shore D hardness of at least 65;
• and
• (B) a second-layer substantially free of volatile organic compounds, said second-layer comprising the reaction product of;
• (I) a second-layer polyisocyanate component;
• and
• (II) a second-layer resin component comprising at least one polyol having a theoretical functionality of at least three;
• wherein the composite structure has a flexural modulus of at least 200,000 lb/in2.

A composite structure comprising:

• (A) a first-layer substantially free of volatile organic compounds, said first-layer comprising the reaction product of;
• (I) a first-layer polyisocyanate component including an aliphatic polyisocyanate;
• (II) a first-layer resin component including an isocyanate-reactive compound, said compound selected from the group consisting of aromatic polyamines, aliphatic polyamines, and mixtures thereof;
• wherein said first-layer has a Shore D hardness of at least 65;
• and
• (B) a second-layer substantially free of volatile organic compounds, said second-layer comprising the reaction product of;
• (I) a second-layer polyisocyanate component;
• and
• (II) a second-layer resin component comprising a plurality of polyols including a first polyether polyol, said first polyether polyol made from an initiator compound having at least three functional groups;
• wherein said first polyether polyol of said plurality has a hydroxyl number of 200 meq polyol/g KOH or more and a viscosity of 5,000 centipoise or less at 25° C.

A composite structure comprising:

• (A) a first-layer substantially free of volatile organic compounds, said first-layer comprising the reaction product of;
• (I) a first-layer polyisocyanate component including an aliphatic polyisocyanate;
• (II) a first-layer resin component comprising a polyamine;
• wherein said first-layer is a show surface of the composite structure and has a Shore D hardness of at least 65;
• (B) a second-layer substantially free of volatile organic compounds, said second-layer comprising the reaction product of;
• (I) a Second-layer polyisocyanate component;
• and
• (II) a second-layer resin component comprising at least one polyol having a theorectical Ranctionality of at least three;
• and
• (C) a barrier-layer (C) disposed between said first (A) and second (B) layers, said barrier-layer (C) comprising the reaction product of a barrier-layer polyisocyanate component, and a barrier-layer resin component;
• wherein the composite structure has a flexural modulus of at least 200,000 lb/in2.