| abstract |
A cross-linkable acrylic copolymer having reduced amounts of silane functionalized monomeric units has been found to achieve unexpectedly superior adhesive, cohesive and flexural properties when used in a sealant formulation as compared with known silane functionalized acrylic copolymers. More particularly, it has been found that by reducing the amount of silane functionalized vinyl addition type monomer to less than 1 molar part per 100 molar parts of (meth)acrylate monomer, and reducing the amount of mercaptosilane chain transfer agent to less than 1 molar part per 100 molar parts of (meth)acrylate monomer, it is possible to obtain a copolymer which is capable of being used in a sealant formulation which exhibits vastly improved elastic properties, which are important for high movement sealant formulations, and improved adhesion to metal and glass substrates, while retaining other important sealant properties. |