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US 12,509,545 B2Granted
Anhydride catalysts for urethane and urethane-urea systems
AssigneeUrethane Systems USA LLC
InventorJohnathon A. Cribb
Life of this patent
Estimating the term…
Abstract
Polyurethane and polyurethane-urea compositions are prepared by amine cure under catalyzed reaction conditions. The curing reaction is performed with an acid anhydride based curing catalyst which is added to a prepolymer and then subsequently reacted with an amine based curative.
Claims13
A polyurethane forming composition, comprising the reaction product of:
- i) a diisocyanate,
- ii) a polyol,
- iii) a latent catalyst,
- iv) a chain extender, and
- v) optionally one or more additives,
- wherein
- the diisocyanate and the polyol are reacted to form a prepolymer and the prepolymer is subsequently added with the latent catalyst to form a modified prepolymer and the modified prepolymer is reacted with the chain extender and optionally one or more of the additives,
- the prepolymer contains less than 0.5% by weight of unreacted diisocyanate monomer,
- the latent catalyst is at least one of maleic anhydride, acetic anhydride, propionic anhydride, isobutyric anhydride, hexanoic anhydride, and benzoic anhydride,
- the polyol is at least one of poly(adipate) glycol, poly(hexamethyleneadipate) glycol, poly(ethylene adipate) glycol (PEAG), poly(diethylene adipate) glycol, poly(ethylene/propylene adipate) glycol, poly(trimethylolpropane/hexamethylene adipate) glycol, poly(ethylene/butylene adipate) glycol, poly(butylene adipate) glycol, poly(hexamethylene/neopentyl adipate) glycol, poly(butylene/hexamethylene adipate) glycol (PBHAG), poly(neopentyl adipate) glycol, and mixtures, copolymers and terpolymers thereof, and
- the chain extender is at least one of 4,4′-methylene-bis (2-chloroaniline) (MOCA);
- 4,4,′-methylene-bis(3-chloro-2,6-diethylaniline);
- diethyl toluene diamine;
- t-butyl toluene diamine;
- dimethylthiotoluene diamine;
- trimethylene glycol di-p-amino-benzoate;
- methylenedianiline;
- methylenedianiline-sodium chloride complex;
- and mixtures thereof.
16 more elements
A process for curing a polyurethane forming composition, comprising:
- mixing a prepolymer and a latent catalyst, wherein the latent catalyst comprises an anhydride, thereby forming a modified prepolymer,
- mixing the modified prepolymer and a chain extender and optionally further additives, whereby a curative mixture is formed, and
- reacting the curative mixture,
- wherein
- the prepolymer is the reaction product of a diisocyanate and a polyol,
- the prepolymer contains less than 0.5% by weight of unreacted diisocyanate monomer,
- the latent catalyst is at least one of maleic anhydride, acetic anhydride, propionic anhydride, isobutyric anhydride, hexanoic anhydride, and benzoic anhydride,
- the polyol is at least one of poly(adipate) glycol, poly(hexamethyleneadipate) glycol, poly(ethylene adipate) glycol (PEAG), poly(diethylene adipate) glycol, poly(ethylene/propylene adipate) glycol, poly(trimethylolpropane/hexamethylene adipate) glycol, poly(ethylene/butylene adipate) glycol, poly(butylene adipate) glycol, poly(hexamethylene/neopentyl adipate) glycol, poly(butylene/hexamethylene adipate) glycol (PBHAG), poly(neopentyl adipate) glycol, and mixtures, copolymers and terpolymers thereof, and
- the chain extender is at least one of 4,4′-methylene-bis (2-chloroaniline) (MOCA);
- 4,4,′-methylene-bis(3-chloro-2,6-diethylaniline);
- diethyl toluene diamine;
- t-butyl toluene diamine;
- dimethylthiotoluene diamine;
- trimethylene glycol di-p-amino-benzoate;
- methylenedianiline;
- methylenedianiline-sodium chloride complex;
- and mixtures thereof.
14 more elements
Dependencies are inferred from the claim text.