Claims
- 1. A process for the preparation of polyureapolyurethane elastomers comprising reacting in a closed mold in accordance with the reaction injection molding technique at an isocyanate index of about 95 to 110
- (a) an isocyanate prepolymer having an isocyanate content of about 4 wt. % to about 10 wt. % and having a molecular weight range of about 1000 to about 4000, wherein said isocyanate prepolymer is a reaction product of
- (i) at least one organic polyisocyanate with
- (ii) at least one hydroxyl-group-containing compound having a molecular weight range of about 750 to about 3500, wherein said hydroxyl-group-containing compound contains (A) at least two hydroxyl groups or (B) at least one hydroxyl group and at least one primary or secondary amino group; with
- (b) at least one diamine chain extender having no isocyanate-reactive groups other than amino groups,
- in the substantial absence of compounds having isocyanate-reactive groups other than amino groups.
- 2. A process according to claim 1 wherein the diamine chain extender is an aromatic diamine.
- 3. A process according to claim 2 wherein the aromatic diamine chain extender has at least one C.sub.1 -C.sub.3 alkyl substituent located ortho to one of the amino groups and two C.sub.1 -C.sub.3 alkyl substituents located ortho to the other amino group.
- 4. A process according to claim 2 wherein the aromatic diamine chain extender is 1-methyl-3,5-diethyl-2,4-diaminobenzene.
- 5. A process according to claim 2 wherein the aromatic diamine chain extender is a mixture of 1-methyl-3,5-diethyl-2,4-dimainobenzene with 1-methyl-3,5-diethyl-2,6-diaminobenzene.
- 6. A process according to claim 1 wherein the organic polyisocyanate (i) is a methylene bis(phenylisocyanate).
- 7. A process according to claim 1 wherein component (ii) is a hydroxyl-group-containing compound containing at least two hydroxyl groups.
- 8. A process according to claim 1 wherein component (ii) is a polyoxyalkylene polyether polyol.
- 9. A process according to claim 1 wherein component (ii) is a polytetramethylene diol.
- 10. A process according to claim 1 wherein component (ii) is a polyester of a dicarboxylic acid and a diol or a mixture of two diols.
- 11. A process according to claim 10 wherein the dicarboxylic acid is adipic acid.
- 12. A process according to claim 1 for the preparation of polyurea-polyurethane elastomers comprising reacting in a closed mold in accordance with the reaction injection molding technique at an isocyanate index of about 95 to about 110
- (a) an isocyanate prepolymer having an isocyanate content of about 4 wt. % to about 10 wt. % and having a molecular weight range of about 1000 to about 4000, wherein said isocyanate prepolymer is a reaction product of
- (i) a methylene bis(phenylisocyanate) with
- (ii) a hydroxyl-group-containing compound having a molecular weight range of about 750 to about 3500, wherein said hydroxyl-group-containing compound is a polytetramethylene diol or a polyester of adipic acid and a diol or a mixture of two diols; with
- (b) 1-methyl-3,5-diethyl-2,4-diaminobenzene or a mixture of 1-methyl-3,5-diethyl-2,4-diaminobenzene with 1-methyl-3,5-diethyl-2,6-diaminobenzene,
- in the substantial absence of compounds having isocyanate-reactive groups other than amino groups.
- 13. A process according to claim 1 furhter comprising as an additional component
- (c) an amine terminated polyether containing essentially no hydroxyl groups or other isocyanate reactive groups other than amino groups.
- 14. A process according to claim 1 wherein the reaction of components (a) and (b) is performed in the presence of (d) one or more auxiliaries or additives.
- 15. A process according to claim 13 wherein the reaction of components (a), (b), and (c) is performed in the presence of
- (d) one or more auxiliaries or additives.
- 16. A process according to claim 1 for the preparation of polyurea-polyurethane elastomers comprising reacting in a closed mold in accordance with the reaction injection molding technique at an isocyanate index of about 95 to about 110
- (a) an isocyanate prepolymer having an isocyanate content of about 4 wt. % to about 10 wt. % and having a molecular weight range of about 1000 to about 4000, wherein said isocyanate prepolymer is a reaction product of
- (i) at least one organic polyisocyanate with
- (ii) at least one hydroxyl-group-containing compound having a molecular weight range of about 750 to about 3500, wherein said hydroxyl-group-containing compound contains (A) at least two hydroxyl groups or (B) at least one hydroxyl group and at least one primary or secondary amino group; with
- (b) at least one aromatic diamine chain extender having no isocyanate-reactive groups other than amino groups, and
- (c) an amine terminated polyether containing essentially no hydroxyl groups or other isocyanate reactive groups other than amino groups,
- in the presence of
- (d) one or more auxiliaries or additives,
- in the substantial absence of compounds having isocyanate-reactive groups other than amino groups.
- 17. A polyurea-polyurethane elastomer prepared according to the process of claim 1.
- 18. A polyurea-polyurethane elastomer prepared according to the process of claim 2.
- 19. A polyurea-polyurethane elastomer prepared according to the process of claim 12.
- 20. A polyurea-polyurethane elastomer prepared according to the process of claim 16.
Parent Case Info
This application is a continuation of application Ser. No. 07/386,190 filed Jul. 28, 1989, now abandoned.
US Referenced Citations (16)
Non-Patent Literature Citations (1)
Entry |
Polyurethane Handbook, Edited by G. Oertel (Hanser Publishers, Munich, Vienna and New York, 1985), pp. 352-326. |
Continuations (1)
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Number |
Date |
Country |
Parent |
386190 |
Jul 1989 |
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