Patent ID: 6160029
Filing Date: 2000-12-12
Classification: C08J,C08L

Abstract:
A polymer foam having a crosslinked gel content of no greater than 10 percent, and a density of no greater than 250 kilograms per cubic meter, wherein at least 70 percent by weight of polymers in the foam comprises a blend of:(A) from 5 to 60 percent by weight, based on the combined weight of components (A) and (B), of at least one substantially random interpolymer having a melt index of 0.05 to 1000 grams per 10 minutes, either a crystalline melting point or a glass transition temperature of about 80.degree. C. or less, whichever is appropriate, and having:(1) from 8 to 65 mole percent of its monomeric units derived from;(a) at least one vinyl or vinylidene aromatic monomer, or(b) at least one sterically hindered aliphatic or cycloaliphatic vinyl or vinylidene monomer, or(c) a combination of at least one aromatic vinyl or vinylidene monomer and at least one sterically hindered aliphatic or cycloaliphatic vinyl or vinylidene monomer, and(2) from 35 to 92 mole percent of its monomeric units derived from ethylene, an aliphatic .alpha.-olefin containing from 3 to 20 carbon atoms, or a mixture thereof; and having at least 80 mole percent of its monomeric units derived from (1) and (2); and(B) from 95 to 40 percent by weight, based on the combined weight of components (A) and (B), of at least one polymer having no monomeric units derived from (1)(a), (1)(b), or (1)(c), and at least 80 mole percent of its monomeric units derived from monomers selected from ethylene, aliphatic .alpha.-olefins containing from 3 to 20 carbon atoms, and aliphatic .alpha.-olefins having from 3 to 20 carbon atoms and containing polar groups.