Claims
- 1. Polyurethane plastic, which may be cellular, produced by the reaction of organic polyisocyanates with relatively high molecular weight polyhydroxyl compounds and, optionally, low molecular weight polyhydroxyl compounds; and diamines, said polyurethane plastic containing structural units corresponding to the general formula; ##STR11## in which R' represents a straight or branched divalent aliphatic or cycloaliphatic radical containing from 2 to 20 carbon atoms and
- R" represents hydrogen, a straight or branched alkyl radical containing from 1 to 6 carbon atoms, an aryl radical containing from 6 to 15 carbon atoms, a cycloalkyl radical containing from 4 to 12 carbon atoms, halogen, --NO.sub.2' --CN, --OR'" or a radical ##STR12## where R'" represents a straight or branched alkyl radical containing from 1 to 6 carbon atoms.
- 2. Polyurethane plastics as claimed in claim 1, wherein R" represents hydrogen.
- 3. The polyurethane plastics of claim 1 wherein R" represents an optionally branched alkyl radical containing 1 to 3 carbon atoms, an aryl radical containing from 6 to 10 carbon atoms or a cycloalkyl radical containing from 6 to 9 carbon atoms.
- 4. The polyurethane plastics of claim 1 wherein the urea group in said structural units of said diamines is in the ortho or meta position to the sulfur.
- 5. The polyurethane plastics of claim 1 wherein said relatively high molecular weight polyhydroxyl compounds have a molecular weight of from 400 to 10,000.
- 6. The polyurethane plastics of claim 5 wherein said polyhydroxyl compounds are selected from the group consisting of polyesters, polyethers, polythioethers, polyacetals, polycarbonates, and polyester amides and wherein said polyhydroxyl compounds contain two to four hydroxyl groups.
- 7. The polyurethane plastics of claim 1 wherein said low molecular weight polyhydroxyl compounds have a molecular weight of from 32 to 400 and have at least two hydroxyl groups.
- 8. The polyurethane plastics of claim 1 wherein the molar ratio of polyisocyanates to compounds containing hydroxyl and amino groups is between 0.9:1 and 1.5:1.
- 9. The polyurethane plastics of claim 8 wherein said molar ratio is between 1.05:1 and 1.25:1.
- 10. The polyurethane plastics of claim 1 wherein the molar ratio of reactive hydrogen in the diamine to reactive hydroxyl groups is between 0.4:1 and 1.5:1.
- 11. In a process for the production of polyurethane plastics comprising reacting:
- (a) organic polyisocyanates;
- (b) compounds containing at least 2 hydroxyl groups and having a molecular weight of from 400 to 10,000;
- (c) optionally low molecular weight polyhydroxyl compounds; and
- (d) sulfur-containing diamines as chain extenders, the improvement wherein said diamines correspond to the formula ##STR13## in which R' represents a straight or branched divalent aliphatic or cycloaliphatic radical containing from 2 to 20 carbon atoms and represents hydrogen, a straight or branched alkyl radical containing from 1 to 6 carbon atoms, an aryl radical containing from 6 to 15 carbon atoms, a cycloalkyl radical containing from 4 to 12 carbon atoms, halogen, --NO.sub.2' --CN, --OR'" or a radical ##STR14## in which R'" represents a straight or branched alkyl radical containing from 1 to 6 carbon atoms.
- 12. A process as claimed in claim 11, wherein said diamines correspond to the formula ##STR15## in which R' and R" are as defined in claim 11.
- 13. A process as claimed in claim 11, wherein said diamines correspond to the formula ##STR16## in which R' is as defined in claim 11.
- 14. The process of claim 11 wherein R" represents an optionally branched alkyl radical containing 1 to 3 carbon atoms, an aryl radical containing from 6 to 10 carbon atoms or a cycloalkyl radical containing from 6 to 9 carbon atoms.
- 15. The process of claim 13 wherein R' represents a straight or branched chain aliphatic hydrocarbon radical containing from 2 to 12 carbon atoms.
- 16. The process of claim 12 wherein said component (b), compounds containing at least 2 hydroxyl groups are selected from the group consisting of polyesters, polyethers, polythioethers, polyacetals, polycarbonates, and polyester amides and contain two to four hydroxyl groups.
- 17. The process of claim 11 wherein said low molecular weight polyhydroxyl compounds have a molecular weight of from 32 to 400 and have at least two hydroxyl groups.
- 18. The process of claim 11 wherein the molar ratio of polyisocyanates to compounds containing hydroxyl and amino groups is between 0.9:1 and 1.5:1.
- 19. The process of claim 18 wherein said molar ratio is between 1.05:1 and 1.25:1.
- 20. The process of claim 11 wherein the molar ratio of reactive hydrogen in the diamine to reactive hydroxyl groups is between 0.4:1 and 1.5:1.
- 21. Polyurethane plastics as claimed in claim 1, wherein said diamines correspond to the formula ##STR17## in which R' represents a straight or branched divalent aliphatic or cycloaliphatic radical containing from 2 to 20 carbon atoms and
- R" represents hydrogen, a straight or branched alkyl radical contaning from 1 to 6 carbon atoms, an aryl radical containing from 6 to 15 carbon atoms, a cycloalkyl radical containing from 4 to 12 carbon atoms, halogen, --NO.sub.2' --CN, --OR'" or a radical ##STR18## where R'" represents a straight or branched alkyl radical containing from 1 to 6 carbon atoms.
- 22. Polyurethane plastics as claimed in claim 21 wherein R" of said diamines is hydrogen.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2734574 |
Jul 1977 |
DEX |
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Parent Case Info
This is a continuation of application Ser. No. 925,349 filed July 17, 1978, now abandoned.
US Referenced Citations (9)
Continuations (1)
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Number |
Date |
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Parent |
925349 |
Jul 1978 |
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