Insect resistant polyurethane foam
View Patent ↗The invention described herein relates to an essentially closed-cell two-component polyurethane foam containing an pesticide, which upon curing provides a barrier to insect infestation.
1. 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.
2. The foam of claim 1 wherein
said at least one second polyol further comprises a rigid polyether polyol having a functionality greater than or equal to 4.4.
3. The foam of claim 2 wherein
said at least one third polyol further comprises a glycerine-based oxypropylated polyether polyol having a functionality greater than or equal to 3.
4. The foam of claim 3 wherein said
“B”-side blowing agent further comprises between 0.1-2% water by weight based on said “B”-side composition.
5. The foam of claim 1 wherein
a closed cell percentage is greater than or equal to 90%.
6. The foam of claim 5 wherein
an R-value of said foam is greater than or equal to approximately 6.0.
7. The foam of claim 6 wherein
a compressive strength of said foam is greater than or equal to approximately 15 psi.
8. The foam of claim 7 wherein
said compressive strength of said foam is greater than or equal to approximately 20 psi.
9. The foam of claim 1 which further comprises
a dye.
10. The foam of claim 1 which further comprises
a diluent and wherein said diluent comprises a compound containing at least one phosphorus atom.
11. The foam of claim 1 which further comprises
a diluent and wherein said diluent comprises a compound containing at least one halogen atom.
12. The foam of claim 11 wherein
said at least one halogen atom is chlorine.
13. The foam of claim 1 which further comprises
a diluent and wherein said diluent comprises at least one phosphorus atom and at least one chlorine atom.
14. An insect-resistant non-water blown, closed cell, two-component polyurethane foam which comprises:
an “A”-side composition comprising
a polymeric methylene diisocyanate;
at least 5% by weight of 1,1,1,2-tetrafluoroethane “A”-side blowing agent based on said “A”-side composition;
a “B”-side hydrophobic resin blend composition comprising
at least one first phthalate-based essentially linear 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 rigid sucrose/glycerine polyether polyol having a functionality greater than or equal to 4;
at least one third polyol, said third polyol comprising an aliphatic glycerine-based polyether polyol having a functionality greater than 3;
at least 15% by weight of 1,1,1,2-tetrafluoroethane “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,
15-32 weight % glyceryl triacetate in said solvent system;
15-32 weight % hydrotreated light petroleum distillate consisting of predominantly C 12 -C 15 isoparafinic hydrocarbons in said solvent system; and
40-55 weight % bis(methylethyl)-1,1′-biphenyl 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 ;
a weight ratio of said “A” composition to said “B” composition ranging from greater than or equal to 1.03:1 to less than or equal to 1.20:1; and
said cured polyurethane foam having a closed cell content of greater than or equal to 90%.
15. The foam of claim 14 wherein
said at least one second polyol further comprises a rigid sucrose/glycerine polyether polyol having a functionality greater than or equal to 4.
16. The foam of claim 15 wherein
said at least one third polyol further comprises an oxypropylated polyether triol having a functionality greater than or equal to 3.
17. An insect-resistant non-water blown, closed cell, two-component polyurethane foam which comprises:
an “A”-side composition comprising:
a polymeric methylene diisocyanate;
at least 5% by weight of 1,1,1,2-tetrafluoroethane “A”-side blowing agent based on said “A”-side composition;
a “B”-side hydrophobic resin blend composition comprising:
at least one phthalate-based essentially linear polyol, said polyol comprising an aromatic polyester having a functionality greater than or equal to 2.2;
at least one rigid polyether polyol having a functionality greater than or equal to 4;
at least one polyether triol having a functionality equal to 3;
at least 15% by weight of 1,1,1,2-tetrafluoroethane “B”-side blowing agent based on said “B”-side composition;
at least one pyrethroid pesticide in a solvent system, said pyrethroid pesticide comprising
bifenthrin in an amount of about 23.4 weight percent in said solvent system,
15-32 weight % glyceryl triacetate in said solvent system;
15-32 weight % hydrotreated light petroleum distillate consisting of predominantly C 12 -C 15 isoparafinic hydrocarbons in said solvent system; and
40-55 weight % bis(methylethyl)-1,1′-biphenyl 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 ;
a weight ratio of said “A” composition to said “B” composition ranging from greater than or equal to 1.03:1 to less than or equal to 1.20:1;
said cured polyurethane foam having a closed cell content of greater than or equal to 90%; and
said cured polyurethane foam having a compressive strength greater than or equal to 15 psi.
18. The foam of claim 17 wherein
said at least one phthalate-based essentially linear polyol, said polyol comprising an aromatic polyester having a functionality greater than or equal to 2.2 is an aromatic phthalate-derived polyester polyol;
said at least one rigid polyether polyol having a functionality greater than or equal to 4 is a sucrose-based polyol/glycerine; and
said at least one polyether triol having a functionality equal to 3 is a glycerine-based polyether polyol.
19. The foam of claim 18 wherein
a weight ratio of said phthalate-based polyol:said sucrose-based polyol:said polyether polyol is approximately 6:6:1.