A tacky agent-forming composition includes a polylactic acid structure-including monofunctional (meth)acrylic monomer, a polylactic acid structure-including polyfunctional (meth)acrylic monomer, and a polylactic acid structure-including non-functional compound. A content of the polylactic acid structure-including non-functional compound is 10% by mole or more.

A tacky agent-forming composition includes a polylactic acid structure-including monofunctional (meth)acrylic monomer, a polylactic acid structure-including polyfunctional (meth)acrylic monomer, and a polylactic acid structure-including non-functional compound. A content of the polylactic acid structure-including non-functional compound is 10% by mole or more.

A composition with improved adhesive and sealant properties comprises a) a pre-polymer comprising a polymeric unit of the general formula (-A-B-).sub.n, wherein A represents a substituted or un-substituted ester, B represents a substituted or un-substituted acid ester comprising at least two acid ester functionalities, and n represents an integer greater than 1; wherein the content of grafted anhydride in the composition is less than 0.05 mol/mol of polyacid.

A composition with improved adhesive and sealant properties comprises a) a pre-polymer comprising a polymeric unit of the general formula (-A-B-).sub.n, wherein A represents a substituted or un-substituted ester, B represents a substituted or un-substituted acid ester comprising at least two acid ester functionalities, and n represents an integer greater than 1; wherein the content of grafted anhydride in the composition is less than 0.05 mol/mol of polyacid.

A composition with improved adhesive and sealant properties comprises a) a pre-polymer comprising a polymeric unit of the general formula (-A-B-).sub.n, wherein A represents a substituted or un-substituted ester, B represents a substituted or un-substituted acid ester comprising at least two acid ester functionalities, and n represents an integer greater than 1; wherein the content of grafted anhydride in the composition is less than 0.05 mol/mol of polyacid.

A composition with improved adhesive and sealant properties comprises a) a pre-polymer comprising a polymeric unit of the general formula (-A-B-).sub.n, wherein A represents a substituted or un-substituted ester, B represents a substituted or un-substituted acid ester comprising at least two acid ester functionalities, and n represents an integer greater than 1; wherein the content of grafted anhydride in the composition is less than 0.05 mol/mol of polyacid.

Polyester compositions are the reaction product of a reaction mixture including at least two different diacids, and at least two different diols. At least one diacid or diol has at least one pendant ethylenically unsaturated group, and at least one diacid or diol has at least one pendant ionic group. The polyester composition has a glass transition temperature in a range of 60 C. to 12 C., and is a vibration-damping, pressure sensitive adhesive.