Patent ID: 8318827

Claim:
An insect-resistant non-water blown, closed cell, two-component polyurethane foam which comprises: an “A”-side composition comprising a diisocyanate; at least 5% by weight of an “A”-side blowing agent based on said “A”-side composition; a “B”-side hydrophobic resin blend composition comprising at least one first polyol, said first polyol comprising an aromatic polyester having a functionality greater than or equal to 2,2; at least one second polyol, said second polyol comprising a polyether polyol having a functionality greater than or equal to 4; at least one third polyol, said third polyol comprising an aliphatic polyether polyol having a functionality greater than or equal to 3.0; at least 15% by weight of a “B”-side blowing agent based on said “B”-side composition; at least one pyrethroid pesticide in a solvent system comprising bifenthrin in an amount of about 23.4 weight percent in said solvent system, 40-55 weight % bis(methylethyl)-1,1′-biphenyl in said solvent system; 15-32 weight % hydrotreated light petroleum distallate consisting of predominantly C 12 -C 15 isoparafinic hydrocarbons in said solvent system; 15-32 weight % glyceryl triacetate in said solvent system; and about 8.5% of one or more surfactants in said solvent system; said cured polyurethane foam having a foam density greater than or equal to approximately 2.0 lb/ft 3 ; and a weight ratio of said “A” composition to said “B” composition ranging from greater than or equal to 0.9:1 to less than or equal to 1.20:1.