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US RE32,634 EGranted
Adhesive for bonding cured EPDM rubber
AssigneeUniroyal Plastics Company, Inc.
InventorsChester T. Chmiel, Daniel J. Cotsakis
Life of this patent
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Abstract
An adhesive for bonding cured EPDM membranes is provided comprising (A) a halogenated butyl rubber (B) a pre-cross linked butyl rubber (C) a styrene/ethylene butylene/styrene block thermoplastic rubber, (D) a thermoplastic petroleum based hydrocarbon feedstock derived aliphatic monomer resin and (E) an aliphatic isocyanate.
Claims12
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-crosslinked 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.sub.5 -C.sub.9 streams polymerized to varying molecular weights to give a softening point range of 162.degree.-181.degree. 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.
3 more elements
A process for making an adhesive for the bonding of cured EPDM membrane comprising:
- (A) Milling or mixing separately , with carbon black, about 20.0 to about 45.0 parts PHR of a halogenated butyl rubber of the formula:
- ##STR9## where X is Cl or Br and n is about 50 and about 40 to about 65 parts PHR a pre-crosslinked butyl rubber of the formula:
- ##STR10## where A=Crosslinking Agent and n is about 50 , (B) [Solubizing] Solubilizing the butyl rubbers of (A) with about 15 to about 20 parts PHR of a styrene/ethylene butylene/styrene block thermoplastic rubber, about 120 to about 160 parts PHR of a thermoplastic, petroleum hydrocarbon feedstock derived aliphatic monomer resin derived from C.sub.5 -C.sub.9 streams polymerized to varying molecular weights to give a softening point range of 162.degree.-181.degree. C., about 20 to about 35 parts PHR of an aliphatic isocyanate based on an adduct of 1,6 - hexamethylene diisocyanate, about 5 to about 15 parts PHR of an alkali-metal alumino-silicate zeolite adsorbent, and about 0.5 to about 2 PHR of 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.
Dependencies are inferred from the claim text.