Super thin foam gasket and bonding tape

An assembly comprising:

• a first member and a second member;
• and
• a bonding tape compressed between the first member and the second member, wherein the bonding tape includes a polyurethane core, having a first major surface and a second major surface opposite the first major surface;
• and
• the bonding tape is compressed between the first and the second member at a compression of at least about 5%,
• wherein the polyurethane core comprises polyurethane polymer, wherein the polyurethane core has at least one feature selected from the group consisting of:
• (i) an elasticity as measured according to the Thin Gauge Elasticity Test of not more than 30%,
• (ii) a loss of tensile strength of not greater than 30% when exposed to UV light according to standard SAE J1960 (Rev. August 2003),
• (iii) a thickness of polyurethane core tPC of not greater than 0.2 mm,
• (iv) an elongation at break of at least 200%, and
• (v) a tensile strength at break of at least 0.3 MPa.

A method of preparing a polymer sheet, the method comprising

• preparing a polyurethane dispersion;
• casting the polyurethane dispersion onto a liner;
• treating the polyurethane dispersion to have a uniform thickness;
• drying the polyurethane dispersion to form a polyurethane core, wherein the polyurethane core has at least one feature selected from the group consisting of:
• (i) an elasticity as measured according to the Thin Gauge Elasticity Test of not more than 30%,
• (ii) a loss of tensile strength of not greater than 30% when exposed to UV light according to standard SAE J1960 (Rev. August 2003),
• (iii) a thickness in an uncompressed state of not greater than 0.2 mm,
• (iv) an elongation at break of at least 200%, and
• (v) a tensile strength at break of at least 0.3 MPa.