Hybrid acrylic polyurethane pre-polymer and sealant thereon

A process for preparing a silylated hybrid acrylic polyurethane pre-polymer comprising:

• in situ grafting of a silylated polyurethane on a backbone of an acrylic polymer by the steps of:
• reacting said acrylic pre-polymer with a polyol and an initiator;
• adding an isocyante to a reaction mixture leading to the formation of an acrylic urethane hybrid pre-polymer;
• and
• adding a silane to the said reaction mixture.

A process for preparing a sealant composition comprising a silylated hybrid polyurethane acrylic pre-polymer, said process comprising:

• in situ grafting of silylated polyurethane on a back bone of acrylic pre-polymer by the steps of:
• adding an initiator, antioxidant, filler, and UV stabilizer to the acrylic pre-polymer reacting the said reaction mixture with a sylilated polyurethane pre-polymer;
• adding a catalyst to a reaction mixture leading to formation of said sylilated acrylic poly urethane hybrid pre-polymer;
• and
• adding a filler, an adhesion promoters, a moisture scavenger to the reaction mixture.