Rapid-setting polyurethanes prepared in the presence of a cyclic unsaturated aliphatic hydrocarbon

Claim 2

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° 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.

Claim 3

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.

Claim 4

A polyurethane of claim 2 wherein Component (C) is employed in quantities of 20% to 40%.

Claim 5

A polyurethane of claim 3 wherein Component (C) is selected from dicyclopentadiene, 1,5-cyclooctadiene, cyclooctene, dihydrodicyclopentadiene and mixtures thereof.

Claim 6

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° 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.

Claim 7

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° 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.

Claim 8

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.

Claim 9

The process of claim 2 wherein Component (C) is employed in quantities of 20% to 40%.

Claim 10

The process of claim 3 wherein Component (C) is selected from dicyclopentadiene, 1,5-cyclooctadiene, cyclooctene, dihydrodicyclopentadiene and mixtures thereof.