Roof sheeting and flashing elastomeric composition

Claim 2

A roofing composition, said composition selected from the group consisting of roof sheeting and roof flashing, comprising: (a) 100 parts of an elastomer selected from the group consisting of ethylene-propylene-non-conjugated diene terpolymer, butyl rubber and mixtures thereof; (b) 0.1 to 3.0 parts of a compound having the structural formula [(CH 2 ) n NCS)] 2 S 6 wherein n is 4 or 5; and (c) 0.4 to 5.0 parts of a sulfur donor curative; wherein said components (b) and (c) provide at least 0.25 part of total available sulfur; said composition not containing bitumen; and all said parts being by weight.

Claim 3

A roofing composition in accordance with claim 1, wherein said component (b) is dipentamethylenethiuram hexasulfide.

Claim 4

A roofing composition in accordance with claim 1, wherein said component (c) selected from the group consisting of sulfur, dimethyl-diphenylthiuram disulfide, dipentamethylenethiuram disulfide, tetraethylthiuram disulfide, tetramethylthiuram disulfide, alkyl disulfides, selenium diethyldithiocarbamate, selenium dimethyldithiocarbamate, 4,4'-dithiodimorpholine, N,N'-dithiobis(hexahydro-2H-azepinon-2) and mixtures of the above compounds.

Claim 5

A roofing composition in accordance with claim 3, wherein said component (c) is sulfur.

Claim 6

A roofing composition in accordance with claim 1, wherein said component (b) is present in a concentration of 0.2 to 2.0 parts, and said component (c) is present in a concentration of 0.4 to 3.0 parts, all said parts being by weight.

Claim 7

A roofing composition in accordance with claim 5, wherein said component (b) is present in a concentration of 0.3 to 1.2 parts, and said component (c) is present in a concentration of 0.5 to 2.0 parts, all said parts being by weight.

Claim 8

A roofing composition in accordance with claim 1, including an accelerator, said accelerator characterized by the absence of sulfur donor capability.

Claim 9

A roofing composition in accordance with claim 7, wherein said accelerator is selected from the group consisting of dialkylthiourea; trialkylthiourea; tetraalkylthiourea; 2-mercaptoimidazoline; N,N'-diphenylguanidine; N,N-di(2-methylphenyl)guanidine; salts of dialkyldithiocarbamates, where the alkyl group has 1 to 6 carbon atoms and said salts are formed from bismuth, cadmium, copper, iron, lead, potassium, selenium, sodium, tellurium, or zinc; mono-alkylamines; dialkylenethiuram or tetraalkylthiuram monosulfides, where the alkyl or alkylene groups have from 1 to 8 carbon atoms; mercaptobenzothiazole; 4-morpholinylbenzothiazyl disulfide; zinc mercaptobenzothiazole; and mixtures of the above compounds.

Claim 10

A roofing composition in accordance with claim 1, comprising at least one processing oil.

Claim 11

A roofing composition in accordance with claim 1, comprising at least one plasticizer.

Claim 12

A roofing composition in accordance with claim 1, comprising at least one filler and reinforcing agent.

Claim 13

A roofing composition in accordance with claim 11, wherein said filler and reinforcing agent are selected from the group consisting of carbon black, silicates, talc, clay, calcium carbonate, and mixtures thereof.