Patent ID: 8901194

Claim:
A durable ambient light curable waterproof liquid rubber formulation with a volatile organic compound content of less than 450 grams per liter, comprising: a. a low viscosity liquid intermediate rubber formulation with a saturated backbone of propylene, a saturated backbone of ethylene, and an unsaturated diene with ultra violet activated sites capable of crosslinking with or reacting with a free radical or a free radical on another terpolymer, comprising: (i) a first portion of ethylene propylene diene terpolymer (EPDM) wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer; (ii) a first portion of solvent, wherein the first portion of solvents is 33 weight percent to 67 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation; (iii) a second portion of ethylene propylene diene terpolymer (EPDM), wherein the second portion of ethylene propylene diene terpolymer (EPDM) is 0.1 weight percent to 50 weight percent of the total amount of ethylene propylene diene terpolymer (EPDM); and (iv) a second portion of solvent, wherein the second portion of solvent is 33 weight percent to 80 weight percent of a total amount of solvent used in the resulting durable ambient light curable waterproof liquid rubber formulation; b. 0.01 weight percent to 10 weight percent of a co-agent, wherein the co-agent is based upon the total weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation to accelerate reaction of the free radicals with the active sites of the unsaturated diene to cross link the terpolymer, and the co-agent comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, and a phenylenedimaleimide; and c. 0.1 weight percent to 10 weight percent of a photoinitiator devoid of thermally activated accelerators to the low viscosity liquid intermediate rubber formulation to generate free radicals that react with the active sites of the unsaturated diene, wherein the photoinitiator is selected from the group having at least one Type I photoinitiators including: bis (2,4,6- trimethylbenzoyl)-phenyl phosphineoxide, and 1-hydroxy-cyclohexyl-phenyl-ketone; and at least one Type II photoinitiators including benzophenone, alpha hydroxyl ketone, alpha amino ketone, and isothioxanthone, wherein all the photoinitiators are devoid of thermally activated accelerators; and forming the durable ambient light curable waterproof liquid rubber formulation devoid of thermally activated accelerators and adapted to crosslink and form a waterproof seal on a substrate only in the presence of ultraviolet light at ambient temperatures without the addition of heat.