Extrudable thermoplastic elastomeric urea-extended polyurethane
AssigneeSimula, Inc.
InventorEdwin C. Slagel
Life of this patent
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Abstract
An extrudable urea-extended thermoplastic polyurethane elastomer is formed from at least one aliphatic diisocyanate, at least one polyester glycol or polyether glycol, and at least one diamine curing agent. At least one second diamine curing agent and/or at least one extrusion processing aid may be included. The polyurethane has high-temperature-resistance and is thus extrudable at high temperatures. The polyurethane is also strong and durable. The polyurethane can be liquid-cast, injection-molded, transfer-molded, sprayed, and extruded without changing either the chemistry or stoichiometry of the polyurethane. The polyurethane may be used for making vehicle air bags or other any application for thermoplastic urethanes which requires increased thermal stability.
Claims28
An extrudable thermoplastic elastomeric urea-extended polyurethane comprising the reaction product of:
- (a) a polyurethane prepolymer comprising the reaction product of at least one aliphatic diisocyanate with at least one hydroxy-containing intermediate selected from the group consisting of polyester glycols, polyether glycols, and mixtures thereof,
- (b) at least one first diamine curing agent selected from the group consisting of 2,4-diamino-3,5-diethyl-toluene, 2,6-diamino-3,5-diethyl-toluene, and methylene dianiline, and
- (c) at least one second diamine curing agent selected from the group consisting of 4,4'-methylene-bis(2,6-diisopropylaniline), 4,4'-methylene-bis(2,6-dimethylaniline), 4,4'-methylene-bis(2-ethyl-6-methylaniline), 4,4'-methylene-bis(2,6-diethylaniline), 4,4'-methylene-bis(2-isopropyl-6-methylaniline), 4,4'-methylene-bis(2,6-diethyl-3-chloroaniline), and trimethylene glycol di-para aminobenzoate.
A process for making an extrudable thermoplastic elastomeric urea-extended polyurethane comprising the steps of:
- (a) reacting at least one aliphatic diisocyanate with at least one hydroxy-containing intermediate selected from the group consisting of polyester glycols and polyether glycols, to form a prepolymer, and
- (b) reacting said prepolymer with at least one first diamine curing agent selected from the group consisting of 2,4-diamino-3,5-diethyl-toluene, 2,6-diamino-3,5-diethyl-toluene, and methylene dianiline, and with at least one second diamine curing agent selected from the group consisting of 4,4'-methylene-bis(2,6-diisopropylaniline), 4,4'-methylene-bis(2,6-dimethylaniline), 4,4'-methylene-bis(2-ethyl-6-methylaniline), 4,4'-methylene-bis(2,6-diethylaniline), 4,4'-methylene-bis(2-isopropyl-6-methylaniline), 4,4'-methylene-bis(2,6-diethyl-3-chloroaniline), and trimethylene glycol di-para aminobenzoate.
A process for forming a product comprising
- (a) heating a thermoplastic elastomeric urea-extended polyurethane comprising the reaction product of at least one aliphatic diisocyanate, at least one hydroxy-containing intermediate selected from the group consisting of polyester glycols, polyether glycols, and mixtures thereof, and at least one diamine curing agent comprising at least one member selected from the group consisting of 2,4-diamino-3,5-diethyl-toluene, 2,6-diamino-3,5-diethyl-toluene, and methylene dianiline, and at least one member selected from the group consisting of 4,4'-methylene-bis(2,6-diisopropylaniline), 4,4'-methylene-bis(2,6-dimethylaniline), 4,4'-methylene-bis(2-ethyl-6-methylene), 4,4'-methylene-bis(2,6-diethylaniline), 4,4'-methylene-bis(2-isopropyl-6-methylaniline), 4,4'-methylene-bis(2,6-diethyl-3-chloroaniline), and trimethylene glycol di-para aminobenzoate, and
- (b) extruding the heated polyurethane to form an extruded product.
Dependencies are inferred from the claim text.