Claims
- 1. A solid, rigid, non-cellular polyurethane having a density of at least about 1 g/cc, a percent elongation of less than 100, resulting from the admixture of the components of a polyurethane-forming composition, which can be demolded within 5 minutes after admixture of said components said polyurethane-forming composition comprising
- (A) a polyol or mixture of polyols having a functionality of from 2 to about 8 and an average hydroxyl equivalent weight of from about 30 to less than about 250;
- (B) an organic polyisocyanate;
- (C) as a modifier, a cyclic unsaturated aliphatic hydrocarbon having a boiling point of at least about 140.degree. C.;
- (d) an organo-metallic catalyst for urethane formation;
- wherein Components (A) and (B) are present in quantities so as to provide an NCO:OH ratio of from about 0.8:1 to about 2:1; Component (C) is present in quantities of from about 15 to about 50 percent by weight of the sum of Components (A), (B) and (C); Component (D) is present in quantities of from about 0.1 to about 10 percent by weight of the sum of the weights of Components (A), (B) and (C); with the proviso that when Component (A) is an amine initiated polyol, the quantity of Component (D) may be zero and when Component (A) is a difunctional polyol, then the average NCO-functionality of Component (B) is at least about 2.5.
- 2. A polyurethane of claim 1, wherein Component (A) has an average equivalent weight of from about 75 to about 200; Components (A) and (B) are employed in quantities such that the NCO:OH ratio is from about 0.95:1 to about 1.1:1; and Component (D) when present is employed in quantities of from about 0.1 to about 2 percent.
- 3. A polyurethane of claim 2 wherein Component (C) is employed in quantities of 20% to 40%.
- 4. A polyurethane of claim 3 wherein Component (C) is selected from dicyclopentadiene, 1,5-cyclooctadiene, cyclooctene, dihydrodicyclopentadiene and mixtures thereof.
- 5. A process for producing solid, rigid, non-cellular polyurethane articles having a density of at least 1 g/cc, a percent elongation of less than about 100, and which can be demolded within a period of about 5 minutes without the addition of an external source of heat which process comprises:
- (1) admixing the components of a composition comprising
- (A) a polyol or mixture of polyols having a functionality of from 2 to about 8 and an average hydroxyl equivalent weight of from about 30 to less than about 250;
- (B) an organic polyisocyanate;
- (C) as a modifier, a cyclic unsaturated aliphatic hydrocarbon having a boiling point of at least about 140.degree. C.;
- (d) an organo-metallic catalyst for urethane formation;
- wherein Components (A) and (B) are present in quantities so as to provide an NCO:OH ratio of from about 0.8:1 to about 2:1; Component (C) is present in quantities of from about 15 to about 50 percent by weight of the sum of Components (A), (B) and (C); Component (D) is present in quantities of from about 0.1 to about 10 percent by weight of the sum of the weights of Components (A), (B) and (C); with the proviso that when Component (A) is an amine initiated polyol, the quantity of Component (D) may be zero and when Component (A) is a difunctional polyol, then the average NCO-functionality of Component (B) is as least about 2.5;
- (2) placing the admixed composition into a suitable mold wherein said composition solidifies within less than about 5 minutes to a solid having the aforesaid density and elongation; and
- (3) subsequently demolding the resultant article from the mold.
- 6. The process of claim 1, wherein Component (A) has an average equivalent weight of from about 75 to about 200; Components (A) and (B) are employed in quantities such that the NCO:OH ratio is from about 0.95:1 to about 1.1:1; and Component (D) when present is employed in quantities of from about 0.1 to about 2 percent.
- 7. The process of claim 2 wherein Component (C) is employed in quantities of 20% to 40%.
- 8. The process of claim 3 wherein Component (C) is selected from dicyclopentadiene, 1,5-cyclooctadiene, cyclooctene, dihydrodicyclopentadiene and mixtures thereof.
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of application Ser. No. 768,134, filed Feb. 14, 1977, and now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
3714110 |
Verdol et al. |
Jan 1973 |
|
3801532 |
Olstowski |
Apr 1974 |
|
3878157 |
Olstowski et al. |
Apr 1975 |
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3879329 |
Olstowski et al. |
Apr 1975 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
768134 |
Feb 1977 |
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