Patent ID: 8901201
Filing Date: 2014-12-02
Classification: C08K,C08L,C09D

Abstract:
1. A method for making a durable ambient light curable waterproof liquid rubber formulation with a volatile organic compound content of less than 450 grams per liter, comprising: a. blending in a closed vessel forming a solution, a first portion of ethylene propylene diene terpolymer (EPDM) with a first portion of solvent, wherein the ethylene propylene diene terpolymer (EPDM) is 50 weight percent to 99 weight percent of a total amount of ethylene propylene diene terpolymer used in a resulting durable ambient light curable waterproof liquid rubber formulation and the first portion of solvent 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; b. mixing the solution in a high shear mixer for at least 10 to 240 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius forming a high viscosity solution; c. adding a second portion of ethylene propylene diene terpolymer (EPDM) to the high viscosity solution, 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) used in the resulting durable ambient light curable waterproof liquid rubber formulation; d. adding a second portion of solvent to the high viscosity solution 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; e. blending the high viscosity solution for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius to form 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 for crosslinking with or reacting with a free radical or a free radical on another terpolymer; f. adding a co-agent to the low viscosity liquid intermediate rubber formulation to accelerate reaction of the free radicals with the active sites of the unsaturated diene to cross link the terpolymer, wherein the co-agent is 0.01 weight percent to 10 weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation and the co-agent comprises at least one of: an acrylate, a triallyl cyanurate, a polybutadiene, and a phenylenedimaleimide; and g. blending the low viscosity liquid intermediate rubber formulation with the co-agent at a low shear rate for 10 minutes to 120 minutes at a temperature from 20 degrees Celsius to 50 degrees Celsius in the absence of ultraviolet light; and h. adding 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 0.1 weight percent to 10 weight percent of the resulting durable ambient light curable waterproof liquid rubber formulation; wherein the photoinitiator is from 1 weight percent to 20 weight percent based on the total solvent content of the resulting durable ambient light curable waterproof liquid rubber formulation, wherein photoinitiators include Type I photoinitiators including: bis (2,4,6-trimethylbenzoyl)-phenyl phosphineoxide, and 1-hydroxy-cyclohexyl-phenyl-ketone; and Type II photoinitiators include benzophenone, alpha hydroxyl ketone, alpha amino ketone, isothioxanthone, and combinations thereof, and wherein all photoinitiators are devoid of thermally activated accelerators; and i. forming a 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 without the addition of heat.