Spray polyurea elastomers containing organic carbonates to improve processing characteristics
AssigneeHuntsman Corporation
InventorDudley J. Primeaux, II
Life of this patent
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Abstract
Spray polyurea elastomers are disclosed made from an (A) component and a (B) component, where the (A) component has a quasi-prepolymer made from an isocyanate and an active hydrogen-containing material, such as a polyoxyalkylenepolyamine. The (B) component includes an amine resin, such as an amine-terminated polyoxyalkylene polyol which may be the same or different from the polyoxyalkylene polyamine of the quasi-prepolymer. The viscosity of the (A) component is reduced by the inclusion of an organic, alkylene carbonate, such as ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate, and the like. The alkylene carbonate also serves as a compatibilizer between between the two components, thus giving an improved mix of the system.
Claims20
A spray polyurea elastomer made by the process comprising the steps of:
- reacting together an isocyanate, and an active hydrogen-containing material to form a quasi-prepolymer;
- mixing an alkylene carbonate with the quasi-prepolymer after the quasi-prepolymer is formed, to produce an (A) component;
- and
- reacting together the (A) component and a (B) component comprising at least one amine resin by combining the components through a spray gun.
A spray polyurea elastomer made by the process comprising the steps of:
- reacting together an isocyanate, and an active hydrogen-containing material to form a quasi-prepolymer;
- mixing an alkylene carbonate of the formula:
- ##STR3## where R.sup.1 and R.sup.2 are independently hydrogen or lower alkyl groups of 1 to 4 carbon atoms, with the quasi-prepolymer after the quasi-prepolymer is formed, to produce an (A) component, where the proportion of alkylene carbonate in the (A) component ranges from about 1 to about 20% of the (A) component;
- and
- reacting together the (A) component;
- and
- a (B) component comprising at least one amine resin, by combining the components through a spray gun.
A spray polyurea elastomer made by the process comprising the steps of:
- reacting together an isocyanate, and an active hydrogen-containing material to form a quasi-prepolymer;
- mixing an alkylene carbonate selected from the group consisting of ethylene carbonate, propylene carbonate, butylene carbonate, dimethyl carbonate and mixtures thereof, with the quasi-prepolymer after the quasi-prepolymer is formed, to produce an (A) component where the proportion of alkylene carbonate in the (A) component ranges from about 1 to about 20% of the (A) component;
- and
- reacting together the (A) component;
- and
- a (B) component comprising an amine resin blend having at least two amine-terminated polyoxyalkylene polyols by combining the components through a spray gun,
- where the volumetric ratio of the (A) component to the (B) component is from about 30 to 70 percent of the (A) component to about 70 to 30 percent of the (B) component.
Dependencies are inferred from the claim text.