Insecticidally treated fabric having improved wash durability and insecticidal efficacy and method for its production
The invention provides a method for preparing insecticidally treated textile having improved properties. A novel combination of an insecticide and certain polymeric binder(s) or dye fixatives is used to coat and/or impregnate fabric via a combination of application methods used in the textile industry. The insecticide-binder or insecticide-dye fixative combination and the method by which it is applied to the textile yield a coated fabric and, ultimately, finished goods with improved wash durability of the insecticide over several launderings and prolonged insecticidal efficacy.
1 . A method of enhancing efficacy of fabric to repel insects before and after repeated launderings of said fabric, said method comprising
a) providing a solution containing a dispersion of an insecticide and
b) impregnating a fabric with said solution either by pad application or exhaustion application.
2 . The method according to claim 1 , wherein the insecticide is permethrin.
3 . The method according to claim 1 , wherein said solution further includes a polymeric binder.
4 . The method according to claim 2 , wherein said solution further includes a polymeric binder.
5 . The method according to claim 1 , wherein said solution further includes a dye fixative agent.
6 . The method according to claim 2 , wherein said solution further includes a dye fixative agent.
7 . The method according to claim 3 wherein said polymeric binder comprises a polyester polymer.
8 . The method according to claim 4 wherein said polymeric binder comprises a polyester polymer.
9 . The method according to claim 3 wherein said polymeric binder comprises a polyetheramide polymer.
10 . The method according to claim 4 wherein said polymeric binder comprises a polyetheramide polymer.
11 . The method according to claim 3 wherein said polymeric binder comprises a DMDHEU/polyol polymer.
12 . The method according to claim 4 wherein said polymeric binder comprises a DMDHEU/polyol polymer.
13 . The method according to claim 7 wherein said polyester polymer comprises a reaction product of a polyalkyleneglycol, an aromatic dicarboxylic acid, and an alkyleneglycol.
14 . The method according to claim 8 wherein said polyester polymer comprises a reaction product of a polyalkyleneglycol, an aromatic dicarboxylic acid, and an alkyleneglycol.
15 . The method according to claim 14 wherein said polyester polymer comprises a poly(C 2 -C 4 )alkyleneterephthalate or mixtures thereof.
16 . The method according to claim 15 wherein said polyester polymer comprises polyethyleneterephthalate or polytetramethyleneterephthalate.
17 . The method according to claim 9 wherein said polyetheramide polymer comprises a copolymer of a polyalkyleneglycol and a poly(C 3 -C 12 )alkyllactam.
18 . The method according to claim 10 wherein said polyetheramide polymer comprises a copolymer of a polyalkyleneglycol and a poly(C 3 -C 12 )alkyllactam.
19 . The method according to claim 17 wherein said polyetheramide polymer comprises a PEG/polycaprolactam polymer or a PEG/polylauryllactam polymer.
20 . The method according to claim 18 wherein said polyetheramide polymer comprises a PEG/polycaprolactam polymer or a PEG/polylauryllactam polymer.
21 . The method according to claim 5 wherein said dye fixative agent comprises a sulfonated naphthalene formaldehyde condensate, a sulfonated phenol formaldehyde condensate, a dihydroxy diphenyl sulfone formaldehyde condensate, or mixtures thereof.
22 . The method according to claim 6 wherein said dye fixative agent comprises a sulfonated naphthalene formaldehyde condensate, a sulfonated phenol formaldehyde condensate, a dihydroxy diphenyl sulfone formaldehyde condensate, or mixtures thereof.
23 . The method according to claim 11 , wherein said polymeric binder is a DMDHEU/PEG polymer.
24 . The method according to claim 12 , wherein said polymeric binder is a DMDHEU/PEG polymer.
25 . The method according to claim 1 , wherein said fabric to be impregnated is selected from the group consisting of cotton, polyester, natural and synthetic polyamides, acrylic, cellulose acetate, polyaramide, polypropylene fabric, and blends thereof.
26 . The method according to claim 2 , wherein said fabric to be impregnated is selected from the group consisting of cotton, polyester, natural and synthetic polyamides, acrylic, cellulose acetate, polyaramide, polypropylene fabric, and blends thereof.
27 . An insect repelling fabric intended for garment manufacture and incorporating an insect repelling effective amount of permethrin and a retention additive for retaining an effective insecticidal amount of permethrin in said fabric following multiple wash cycles of garments made from said fabric, wherein said retention aid comprises a polyester polymer binder, a polyetheramide polymer binder, a polyurethane binder, DMDHEU/polyol polymer, or a dye fixative agent.
28 . The fabric according to claim 27 wherein the fabric is a nylon fabric and the retention additive is selected from the group consisting of a polyetheramide polymer binder and a dye fixative agent.
29 . The fabric according to claim 27 wherein the fabric is a polyester fabric and the retention additive is a polyester polymer binder.
30 . The fabric according to claim 29 wherein the retention additive is a poly(C 2 -C 4 )alkyleneterephthalate polymer.
31 . The fabric according to claim 27 wherein the fabric is a cotton or a cotton/polyester blend and the retention additive is a DMDHEU/PEG polymer.
32 . The fabric according to claim 27 wherein the effective insecticidal amount of permethrin is achieved at an application rate of 1.25 g/m 2 and said retention additive enables retention of permethrin in the fabric following successive machine launderings at levels from about 90% to about 95% of said application rate.
33 . The fabric according to claim 32 which is machine laundered from 5 to about 50 times.
34 . A method of enhancing efficacy of fabric to repel insects before and after repeated launderings of said fabric, said method comprising
a) providing a solution containing a dispersion of permethrin and a retention additive selected from the group consisting of a polyester polymer binder, a polyetheramide polymer binder, a polyurethane binder, a DMDHEU/polyol polymer, and a dye fixative agent, and
b) impregnating a fabric with said solution to achieve a permethrin application rate of 1.25 g/m 2 either by pad application or exhaustion application.
35 . The method of claim 34 wherein said fabric is a polyamide fabric.
36 . The method of claim 35 wherein said polyamide fabric is a nylon fabric.
37 . The method of claim 36 wherein said nylon fabric is a cordura nylon fabric.