Soft and flexible foams made from blends of alkenyl aromatic polymers and alpha-olefin/vinyl or vinylidene aromatic and/or sterically hindered aliphatic or cycloaliphatic vinyl or vinylidene interpolymers

摘要

A soft foam having an Asker C hardness of less than about 65, comprising;;(A) from about 30 to about 70 percent by weight (based on the combined weight of Components A and B) of one or more alkenyl aromatic polymers and wherein at least one of said alkenyl aromatic polymers has a molecular weight (M_w) of from about 100,000 to about 500,000; and;(B) from about 30 to about 70 percent by weight (based on the combined weight of Components A and B) of one or more substantially random interpolymers having an I₂ of about 0.1 to about 50 g/10 min, an M_w/M_n of about 1.5 to about 20; comprising;(1) from about 8 to about 45 mol % of polymer units derived from;;(a) at least one vinyl or vinylidene aromatic monomer, or;(b) at least one 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 hindered aliphatic or cycloaliphatic vinyl or vinylidene monomer, and;(2) from about 55 to about 92 mol % of polymer units derived from at least one of ethylene and/or a C_3-20 -olefin; and;(3) from 0 to about 20 mol % of polymer units derived from one or more of ethylenically unsaturated polymerizable monomers other than those derived from (1) and (2); and;(C) optionally, one or more nucleating agents; and;(D) optionally, one or more other additives; and;(E) one or more blowing agents present in a total amount of from about 0.4 to about 5.0 gram-moles per kilogram (based on the combined weight of Components A and B).