Hybrid sealant composition

The hybrid sealant composition comprising:

• an acrylic pre-polymer;
• an isocyanate that is a diisocyanate or a polyisocyanate;
• a tri-functional acrylate as a cross-linker;
• a catalyst;
• a plasticizer present in an amount of 0 to 15 percent by weight;
• an initiator present in an amount of 0.01 to 0.1 percent by weight;
• a solvent present in an amount of 1 to 15 percent by weight;
• an antioxidant present in an amount of 0.1 to 2 percent by weight;
• an adhesion promoter and a moisture scavenger each present in an amount of 0.1 to 1 percent by weight;
• and an ultraviolet (UV) stabilizer present in an amount of 0.1 to 2 percent by weight.

A process of preparing the hybrid sealant composition comprising:

• adding together acrylic pre-polymer, optionally filler, plasticizer and anti-oxidant dissolved in solvent in a reaction vessel;
• blending to form a homogenous mass;
• adding a cross-linker, an initiator, an adhesion promoter and a moisture scavenger to the homogenous mass;
• cooling down the mass;
• adding UV stabilizers to the homogenous mass;
• continuing reaction with addition of isocyanate functional monomer and catalyst with vigorous stirring to form a final charge;
• cooking the final charge under vacuum;
• and
• packing the final charge after the cooking in a nitrogen atmosphere.