Elastomeric compound
View Patent ↗The subject invention reveals a method for preparing a coated fabric which comprises (I) applying a vulcanizable elastomer composition to a layer of fabric, wherein the vulcanizable elastomer composition is made by: (1) mixing a cross-linkable functionalized polyethylene with at least one cross-linkable liquid elastomer to form a non-reactive extrudant, wherein the mixing occurs at a temperature in the range of 10° F. above or below the melt point of the cross-linkable functionalized polyethylene, and wherein the non-reactive extrudant contains from 20 to 80 pph of the cross-linkable liquid elastomer, (2) extruding the non-reactive extrudant, and (3) mixing the extrudent with at least one curing agent, wherein the mixing is sufficient to form the vulcanizable elastomer which has a complex dynamic viscosity of less than 5 McP (5,000 N*s/m2) for at least 2 minutes at a maximum flow temperature; and (II) heating the layer of fabric having the vulcanizable elastomer applied thereto to a temperature which is within the range of 200° F. to 310° F. for at least 2 minutes to produce the coated fabric.
1. A method for preparing a coated fabric which comprises (I) applying a vulcanizable elastomer composition to a layer of fabric, wherein the vulcanizable elastomer composition is made by a method comprising the steps of: (1) mixing a cross-linkable functionalized polyethylene with at least one cross-linkable liquid elastomer to form a non-reactive extrudant, wherein the mixing occurs at a temperature in the range of 10° F. above or below the melt point of the cross-linkable functionalized polyethylene, and wherein the non-reactive extrudant contains from 20 to 80 parts per hundred of the cross-linkable liquid elastomer, (2) extruding the non-reactive extrudant, and (3) mixing the extrudent with at least one curing agent, wherein the mixing is sufficient to form the vulcanizable elastomer, and wherein the vulcanizable elastomer has a complex dynamic viscosity of less than 5 McP (5,000 N*s/m 2 ) for at least 2 minutes at a maximum flow temperature; and (II) heating the layer of fabric having the vulcanizable elastomer applied thereto to a temperature which is within the range of 200° F. to 310° F. for at least 2 minutes to produce the coated fabric.
2. The method of claim 1 wherein the layer of fabric is a non-woven fabric.
3. The method of claim 1 wherein the layer of fabric is a woven fabric.
4. The method of claim 1 wherein the layer of fabric is a knitted fabric.
5. The method of claim 1 wherein the layer of fabric is a nylon fabric.
6. The method of claim 1 wherein the layer of fabric is a polyester fabric.
7. The method of claim 1 wherein the layer of fabric is an aramid fabric.
8. The method of claim 1 wherein the layer of fabric is a rayon fabric.
9. The method of claim 1 wherein the layer of fabric is a cotton fabric.
10. The method of claim 1 wherein the extrudant is formed into the shape of strings or pellets.
11. The method of claim 1 wherein the cross-linkable functionalized polyethylene is a cross-linkable oxidized polyethylene.
12. The method of claim 1 wherein the non-reactive extrudant contains from 25 to 60 parts per hundred of the cross-linkable liquid elastomer.
13. The method of claim 1 wherein the cross-linkable liquid elastomer is selected from the group consisting of polybutadiene rubber, nitrile rubber, hydrogenated nitrile rubber, styrene-butadiene rubber, neoprene rubber, butyl rubber, polyisoprene rubber, propylene rubber, carboxylated nitrile rubber, and EP(D)M rubber.
14. The method of claim 1 wherein the non-reactive extrudant contains from 30 to 55 parts per hundred of the cross-linkable liquid elastomer.
15. The method of claim 1 wherein the cross-linkable liquid elastomer is polybutadiene rubber.
16. The method of claim 1 wherein the cross-linkable liquid elastomer is styrene-butadiene rubber.
17. The method of claim 1 wherein the cross-linkable liquid elastomer is polyisoprene rubber.
18. The method of claim 1 wherein a non-reactive extrudant is further comprised of an ethylene-propylene rubber and an enthylene-propylene-diene rubber.
19. A method for preparing a coated cord which comprises (I) applying a vulcanizable elastomer composition to an uncoated cord, wherein the vulcanizable elastomer composition is made by a method comprising the steps of: (1) mixing a cross-linkable functionalized polyethylene with at least one cross-linkable liquid elastomer to form a non-reactive extrudant, wherein the mixing occurs at a temperature in the range of 10° F. above or below the melt point of the cross-linkable functionalized polyethylene, and wherein the non-reactive extrudant contains from 20 to 80 parts per hundred of the cross-linkable liquid elastomer, (2) extruding the non-reactive extrudant, and (3) mixing the extrudent with at least one curing agent, wherein the mixing is sufficient to form the vulcanizable elastomer, and wherein the vulcanizable elastomer has a complex dynamic viscosity of less than 5 McP (5,000 N*s/m 2 ) for at least 2 minutes at a maximum flow temperature; and (II) heating the cord having the vulcanizable elastomer applied thereto to a temperature which is within the range of 200° F. to 310° F. for at least 2 minutes to produce the coated cord.
20. The method of claim 19 wherein the cross-linkable liquid elastomer is selected from the group consisting of polybutadiene rubber, nitrile rubber, hydrogenated nitrile rubber, styrene-butadiene rubber, neoprene rubber, butyl rubber, polyisoprene rubber, propylene rubber, carboxylated nitrile rubber, and EP(D)M rubber; and wherein the non-reactive extrudant contains from 30 to 55 parts per hundred of the cross-linkable liquid elastomer.