Static dissipative polyurethane foams
First Claim
1. A method for making a flexible polyurethane foam, comprising:
- mixing at a mix head to react (i) a polyether graft polyol or a polyether graft polyol mixed with an ester polyol and/or a polyether polyol, wherein said polyol or combination of polyols has a number average molecular weight of from about 500 to about 8000, with (ii) an isocyanate selected from the group consisting of diphenylmethane 4,4′
diisocyanate, diphenyl methane 2,2′
diisocyanate, diphenylmethmne 2,4′
diisocyanate, toluene diisocyanate, higher molecular weight isocyanate oligomers, and mixtures thereof, with an isocyanate index in the range of 95 to 110 to form a reaction mix;
incorporating into the reaction mix water in an amount from 0.2 to 1.0 parts by weight per hundred parts polyol;
further incorporating into the reaction mix one or more anti-static additives in an amount from 0.1 to 20 parts by weight per hundred parts polyol, to form a foam-forming mixture; and
presenting the foam-forming mixture to an open container or a moving conveyor to permit free rise expansion of the polyurethane foam;
wherein, upon curing, the polyurethane foam has a density in the range of 6 to 20 pounds per cubic foot, a surface resistivity below 1×
1011 ohms/square as determined at 12% relative humidity and 23°
C., and a pore size in the range of 100 to 250 pores per inch.
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Accused Products
Abstract
A static dissipative flexible polyurethane foam is formed under free rise expansion conditions from a polyether graft polyol and an isocyanate, wherein one or more anti-static additives are incorporated into the reaction mix in an amount from 0.10 to 20 parts by weight. Water is added in an amount of from 0.2 to 1.0 parts per weight. Upon curing, the foam has a density in the range of 6 to 20 pounds per cubic foot, a surface resistivity below 1×1011 ohms/square, and a pore size in the range of 100 to 250 pores per inch. The foam may be fabricated (cut or shaped) to form a shaped article, such as a roller, a clean room wipe, a cosmetic applicator or a packaging element.
24 Citations
17 Claims
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1. A method for making a flexible polyurethane foam, comprising:
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mixing at a mix head to react (i) a polyether graft polyol or a polyether graft polyol mixed with an ester polyol and/or a polyether polyol, wherein said polyol or combination of polyols has a number average molecular weight of from about 500 to about 8000, with (ii) an isocyanate selected from the group consisting of diphenylmethane 4,4′
diisocyanate, diphenyl methane 2,2′
diisocyanate, diphenylmethmne 2,4′
diisocyanate, toluene diisocyanate, higher molecular weight isocyanate oligomers, and mixtures thereof, with an isocyanate index in the range of 95 to 110 to form a reaction mix;
incorporating into the reaction mix water in an amount from 0.2 to 1.0 parts by weight per hundred parts polyol;
further incorporating into the reaction mix one or more anti-static additives in an amount from 0.1 to 20 parts by weight per hundred parts polyol, to form a foam-forming mixture; and
presenting the foam-forming mixture to an open container or a moving conveyor to permit free rise expansion of the polyurethane foam;
wherein, upon curing, the polyurethane foam has a density in the range of 6 to 20 pounds per cubic foot, a surface resistivity below 1×
1011 ohms/square as determined at 12% relative humidity and 23°
C., and a pore size in the range of 100 to 250 pores per inch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 16)
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8. A method for making a shaped polyurethane foam part, comprising:
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mixing at a mix head to react (i) a polyether graft polyol or polyol mixed with ester polyol and/or a polyether polyol, wherein said polyol or combination of polyols has a number average molecular weight of from about 500 to about 8000, with (ii) an isocyanate selected from the group consisting of diphenyl 4,4′
diisocyanate, diphenylmethane 2,2′
diisocyanate, diphenylmethane 2, 4′
diisocyanate, toluene diisocyanate, higher molecular weight isocyanate oligomers, and mixtures thereof, to form a reaction mix;
incorporating into the reaction mix water in an amount from 0.2 to 1.0 parts by weight per hundred parts polyol;
further incorporating into the reaction mix one or more anti-static additives in an amount from 0.1 to 20 parts by weight per hundred parts polyol, to form a foam-forming mixture;
presenting the foam-forming mixture to an open container or a moving conveyor to permit free rise expansion of the polyurethane foam, wherein, upon curing, the polyurethane foam has a density in the range of 6 to 20 pounds per cubic foot, a surface resistivity below 1×
1011 ohms/square as determined at 12% relative humidity and 23°
C., and a pore size in the range of 100 to 250 pores per inch.; and
fabricating the polyurethane foam into the shaped polyurethane foam part. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 17)
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Specification