Composition and method for curing latex compounds
View Patent ↗The invention pertains to a latex compound comprising a natural rubber or a synthetic rubber material and a curing system having organic peroxide. The invention also concerns a method of curing a latex film comprising the steps of forming a film from a latex compound comprising a natural rubber or synthetic rubber material and a curing system having organic peroxide and heating the film to obtain cured natural rubber or synthetic rubber materials.
1. A method of curing a latex film comprising the steps of forming a film from a latex compound having a rubber material and a curing system comprising organic peroxide at about 0.1 to about 5.0 phr, a combination comprising sodium lauryl sulfate and sulfated methyl oleate at about 0.1 to about 5.0 phr, and zinc 2-mercaptotoluimidazole at about 0.1 to about 5.0 phr, and heating the film for about 6 peroxide half-lives to about 10 peroxide half-lives in an open air system.
2. The method of claim 1 wherein the curing system comprises an emulsion or dispersion of organic peroxide in water comprising from about 10% to about 90% organic peroxide and about 10% to about 90% water.
3. The method of claim 1 , wherein the organic peroxide is selected from the group consisting of dicumyl peroxide, 2,5-dimethyl-di-(t-butylperoxy)hexane, di-t-butylperoxide, t-butylcumyl-peroxide, bis(t-butylperoxyisopropyl)benzene, butyl4,4-bis(t-butylperoxy)valerate, 2,5-bis(t-butylperoxy)-2,5-dimethylhexane, 2,5-bis(t-butylperoxy)-2,5-dimethyl-3-hexyne, t-butyl 3-isopropenylcumyl peroxide, bis(3-isopropenylcumyl) peroxide, 1,1-bis(t-butylperoxy)-3,3,5-trimethylcyclohexane, t-butylperoxybenzoate, and bis(2,4-dichlorobenzoyl)peroxide.
4. The method of claim 1 , wherein the rubber material is selected from the group consisting of natural rubber, polyisoprene, polychloroprene, acrylonitrile, styrene-butadiene, sulfur cured butyl, and combinations thereof.
5. The method of claim 1 , wherein the combination further comprises ammonia salts of alkyl phosphates.
6. The method of claim 1 , wherein the curing system further comprises an antioxidant.
7. The method of claim 1 , wherein the curing system further comprises sulfur.
8. The method of claim 1 , wherein the sodium lauryl sulfate is present at about 1.0 phr, the sulfated methyl oleate is present at about 0.5 -1.0 phr, the peroxide is present at about 1.0 phr and the zinc 2-mercaptotoluimidazole is present at about 0.3 -1.7 phr.
9. The method of claim 8 , wherein the combination further comprises ammonia salts of alkyl phosphates at about 0.5 phr.
10. The method of claim 1 , further comprising about 0.75 to 3.75 phr of TAIC or m-phenylenediamaleimide.