Claims
- 1. A process for preparing a polyurethane elastomer which comprises reacting
- (a) an organic polyisocyanate,
- (b) one or more compounds with an average molecular weight of 1000 to 8000 having two or more active hydrogen atoms as determined by the Zerewitinoff method, and
- (c) from 5 to 40 parts of a mixture of alkylated vicinal toluenediamines having the following structural formulae: ##STR3## wherein R and R' independently represent a linear or nonlinear alkyl radical having 1 to 4 carbon atoms.
- 2. The process of claim 1 carried out by means of reaction injection molding techniques.
- 3. The process of claim 2 wherein the amount of reactants is such that 0.9 equivalent to 1.15 equivalents of isocyanate is present per equivalent of active hydrogen atom in (b) plus (c).
- 4. The process of claim 3 carried out in the presence of a catalyst.
- 5. The process of claim 4 carried out in the presence of a blowing agent.
- 6. The process of claim 5 wherein the polyol is selected from the group consisting of polyoxyalkylene polyether polyols and graft polyoxyalkylene polyether polyols.
- 7. The process of claim 6 wherein the organic polyisocyanate is selected from the group consisting of a urethane modified 4,4'-diphenylmethane diisocyanate, a carbodimide modified 4,4'-diphenylmethane diisocyanate, and mixtures of diphenylmethane diisocyanates and polymethylene polyphenyl polyisocyanates.
- 8. A molded polyurethane part prepared in accordance with claim 1.
- 9. A molded polyurethane part prepared in accordance with claims 2, 3, 4, 5, 6, or 7.
Parent Case Info
This is a division, of application Ser. No. 430,176, filed Sept. 30, 1982 and now abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4218543 |
Weber et al. |
Aug 1980 |
|
Divisions (1)
|
Number |
Date |
Country |
Parent |
430176 |
Sep 1982 |
|