Adhesive for bonding cured EPDM rubber

Claim 2

An adhesive for bonding cured EPDM comprising: (A) a halogenated butyl rubber of the formula: ##STR6## where X is Cl or Br and n is about 50 (B) a pre-cross linked butyl rubber of the formula: ##STR7## where A is a crosslinking agent and n is about 50 (C) a styrene/ethylene butylene/styrene block thermoplastic rubber, (D) a thermoplastic, petroleum hydrocarbon feedstock derived aliphatic monomer resin derived from C 5 -C 9 streams polymerized to varying molecular weights to give a softening point range of 162°-181° C. and (E) an aliphatic isocyanate; wherein (A) is at a concentration of 20.0-45.0 PPHR, (B) is at a concentration of 40.0-65.0 PPHR, (C) is at a concentration of 15.0-20.0 PPHR, (D) is at a concentration of 120-160 PPHR and (E) is at a concentration of 20-35 PPHR.

Claim 3

An adhesive of claim 1 where (E) is an aliphatic isocyanate adduct based on 1,6 hexamethylene diisocyanate of the formula: ##STR8##

Claim 4

An adhesive of claim 2 wherein said halogenated butyl rubber has a bromine content of 2.0-2.5% or a chlorine content of 1.1-1.3%.

Claim 5

An adhesive of claim 2 wherein said pre-crosslinked butyl rubber has a weight percent of solubility in cyclohexane of 15-50 percent.

Claim 6

An adhesive of claim 2, wherein said block thermoplastic rubber contains a styrene content of 28-29% by weight, a mid-block content of 71-72% by weight and a tensile strength of 4500-5000 lbs. per square inch.

Claim 7

An adhesive of claim 2, wherein said thermoplastic, aliphatic type hydrocarbon resin has a softening point of 175°-181° C., an acid number of less than 1 and a bromine number of 16.0-20.0.

Claim 8

An adhesive of claim 2, wherein said aliphatic isocyanate is based on 1,6 hexamethylene diisocyanate adduct with an NCO content of 15.0-17.0 percent concentration.

Claim 9

An adhesive composition of claim 2, further comprising an adsorbent of the alkali-metal alumino-silicate zeolite family of compounds at a concentration of 5.0-15.0 PPHR; zinc oxide at a concentration of 0.5-2.0 PPHR; an organic liquid having a solubility parameter of 8.5-8.9. and a hydrogen bonding index of 3.0-3.5 at a total concentration of 500.0-640.0 PPHR resulting in a total solid level of 31.0-37.0 percent and carbon black concentration of 2.0-20.0 PPHR.

Claim 10

An adhesive composition of claim 1 wherein A is 1,4 divinyl benzene, methyl divinyl benzene, 1,3 butadiene, isoprene, 2-ethyl 1,3-butadiene, 1,6 hexadiene, 1,6 hexanediol-diacrylate, 2 methyl-1,3-butadiene, butylene glycol dimethacrylate, 1,4 butanediol diacrylate, thiodiglycol dimethacrylate, diallyl maleate, decamethylene glycol diacrylate, 2-chloro 1,3 butadiene, polyethylene glycol dimethacrylate, 1 phenyl ethylene-1,2 dimethacrylate.

Claim 11

A process for making an adhesive for the bonding of cured EPDM membranes comprising: (A) Milling or mixing separately a halogenated butyl rubber of the formula: ##STR9## where X is Cl or Br and n is about 50 and a pre-crosslinked butyl rubber of the formula: ##STR10## where A=Crosslinking Agent and n is about 50 (B) Solubizing the butyl rubbers of (A) with a styrene/ethylene butylene/styrene block thermoplastic rubber, a thermoplastic, petroleum hydrocarbon feedstock derived aliphatic monomer resin derived from C 5 -C 9 streams polymerized to varying molecular weights to give a softening point range of 162°-181° C., an aliphatic isocyanate based on an adduct of 1,6 hexamethylene diisocyanate, an alkali-metal alumino-silicate zeolite adsorbent, zinc oxide and carbon black in an organic liquid having a solubility parameter of 8.5-8.9 and a hydrogen bonding index of 3.0-3.5.

Claim 12

A process for making an adhesive for the bonding of cured EPDM membranes comprising: (A) Milling or mixing separately a halogenated butyl rubber of the formula: ##STR9## where X is Cl or Br and n is about 50 and a pre-crosslinked butyl rubber of the formula: ##STR10## where A=Crosslinking Agent and n is about 50 (B) Solubizing the butyl rubbers of (A) with a styrene/ethylene butylene/styrene block thermoplastic rubber, a thermoplastic, petroleum hydrocarbon feedstock derived aliphatic monomer resin derived from C 5 -C 9 streams polymerized to varying molecular weights to give a softening point range of 162°-181° C., an aliphatic isocyanate based on an adduct of 1,6 hexamethylene diisocyanate, an alkali-metal alumino-silicate zeolite adsorbent, zinc oxide and carbon black in an organic liquid having a solubility parameter of 8.5-8.9 and a hydrogen bonding index of 3.0-3.5.