Oligomeric polyol compositions
There is provided an oligomeric polyol composition having (a) an oligomeric network containing residues of at least one polyhydroxylated aromatic compound and residues of at least one polyol having at least three hydroxyl groups; and (b) a plurality of peripheral groups having one or more pendant hydroxyl groups bound to the oligomeric network by a plurality of linking units. The residues of the polyol may optionally contain one or more oxygen ether groups, one or more amino ether groups, or both of one or more oxygen ether groups and one or more amino ether groups. Reaction of the oligomeric polyols with isocyanate monomers affords a new class of polyurethanes having superior heat and water resistance. The new polyurethanes exhibit lower peak exotherms, typically less than 250° F. during in-mold polymerization. Articles prepared from polyurethanes incorporating such oligomeric polyol compositions exhibit flexural strengths and moduli in excess of 10,000 psi and 400,000 psi respectively, and outstanding green strength.
1. An oligomeric polyol composition comprising at least one oligomeric polyol component, at least one monomeric polyol, and at least one polyhydroxylated aromatic compound;
wherein the at least one oligomeric polyol component comprises residues of either or both of the at least one monomeric polyol and the at least one polyhydroxylated aromatic compound linked by one or more carbonate groups and optionally one or more oxygen ether groups; and
wherein the at least one monomeric polyol comprises more than three hydroxyl groups and comprises one or more oxygen ether groups.
2. The composition of claim 1 , wherein the at least one monomeric polyol has more than three secondary hydroxyl groups.
3. The composition of claim 1 , wherein at least a portion of the residues of the polyhydroxylated aromatic compound comprises residues of at least one bisphenol.
4. The composition of claim 1 , wherein at least a portion of the oligomeric polyol component residues are linked by carbonate groups.
5. The composition of claim 1 , wherein the at least one monomeric polyol comprises both one or more oxygen ether groups and one or more or linking nitrogen atoms comprised within an alkylene chain.
6. The composition of claim 1 , wherein at least a portion of the at least one polyhydroxylated aromatic compound comprises bisphenol A.
7. The composition of claim 1 , wherein the at least one monomeric polyol is tetrafunctional having four hydroxyl groups.
8. The composition of claim 7 , wherein the at least one monomeric polyol comprises four or more secondary hydroxyl groups.
9. The composition of claim 8 , wherein the at least one polyhydroxylated aromatic compound is present in an amount of from about 15 weight percent to about 37 weight percent based on the total weight of the oligomeric polyol composition.
10. The composition of claim 1 , wherein at least one oligomeric polyol component comprises four or more secondary hydroxyl groups.
11. The composition of claim 10 , wherein at least one oligomeric polyol component comprises six or more secondary hydroxyl groups.
12. The composition of claim 1 , wherein at least one the oligomeric polyol component comprises an oligomeric network comprising residues of the at least one polyhydroxylated aromatic compound and residues of the at least one monomeric polyol; and a plurality of peripheral groups each comprising one or more hydroxyl groups bound to the oligomeric network by a plurality of linking units, wherein at least a portion of the linking units are oxygen atoms of carbonate linkages and optionally hydrocarbyl ether linkages.
13. The composition of claim 12 , wherein at least a portion of the linking units are carbonate linkages.
14. The composition of claim 1 , wherein the at least one oligomeric polyol component comprises carbonate species comprising one or more carbonate groups and two or more residues of the monomeric polyol.
15. The composition of claim 1 , wherein the at least one monomeric polyol comprises a mixture of polyols having an average molecular weight of less than 500 grams per mole.
16. The composition of claim 15 , wherein the at least one monomeric polyol comprises a propoxylated polyether polyol.
17. A method of making the oligomeric polyol composition of claim 1 , comprising contacting one or more compositions containing one or more polyhydroxylated aromatic moieties with one or more monomeric polyols having more than three hydroxyl groups in the presence of at least one activating agent and an effective amount of at least one of a catalyst, a promoter or a mixture thereof, at a temperature sufficient to cause formation of the oligomeric polyol component to provide the product oligomeric polyol composition.
18. The method of claim 17 , wherein the one or more polyhydroxylated aromatic moieties are present in an amount such that the molar ratio of polyhydroxylated aromatic compound to the at least one monomeric polyol is about 0.25 to 1 or greater.
19. The method of claim 17 , wherein the one or more polyhydroxylated aromatic moieties are derived from one or more polycarbonates.
20. The composition of claim 1 , prepared by a method comprising contacting one or more compositions containing one or more polyhydroxylated aromatic moieties with one or more monomeric polyols having more than three hydroxyl groups in the presence of at least one activating agent and an effective amount of at least one of a catalyst, a promoter or a mixture thereof, at a temperature sufficient to cause formation of the oligomeric polyol component to provide the product oligomeric polyol composition.
21. The composition of claim 20 , wherein the one or more polyhydroxylated aromatic moieties are derived from one or more polycarbonates.
22. A polyurethane composition prepared from a composition comprising at least one oligomeric polyol component, at least one monomeric polyol, and at least one polyhydroxylated aromatic compound;
wherein the at least one oligomeric polyol component comprises residues of either or both of the at least one monomeric polyol and the at least one polyhydroxylated aromatic compound linked by one or more carbonate groups and optionally one or more oxygen ether groups; and
wherein the at least one monomeric polyol comprises more than three hydroxyl groups, wherein urethane units are formed from reaction of isocyanate moieties of one or more polyisocyanates and at least a portion of the hydroxyl groups of the at least one oligomeric polyol component and at least a portion of the hydroxy groups of the at least one monomeric polyol.
23. An article comprising the composition according to claim 22 , which exhibits a heat distortion temperature in excess of 110 degrees centigrade, a flexural strength in excess of 10,000 psi and a flexural modulus in excess of 400,000 psi.
24. A method comprising: contacting the composition of claim 1 with one or more polyisocyanate moieties, optionally in the presence of a catalyst, at a temperature sufficient to cause at least a portion of the hydroxyl groups of the at least one oligomeric polyol component and at least a portion of the hydroxy groups of the at least one monomeric polyol to react with one or more isocyanate groups or latent isocyanate groups of the polyisocyanate moieties to form a polyurethane product.
25. A method comprising:
(a) mixing a first reactant comprising one or more polyisocyanates or latent polyisocyanates with a second reactant comprising the oligomeric polyol composition according to claim 1 to form a reactive mixture;
(b) transferring the reactive mixture into a mold; and
(c) curing the reactive mixture within the mold to afford a molded part;
wherein during step (c) at least a portion of the hydroxyl groups of the at least one oligomeric polyol component and at least a portion of the hydroxy groups of the at least one monomeric polyol reacts with one or more isocyanate groups or latent isocyanate groups to form a polyurethane product.
26. A composition comprising:
(a) first part comprising a polyisocyanate; and
(b) a second part comprising an oligomeric polyol composition according to claim 1 ; wherein when the first part and the second part are contacted the composition cures by reaction of at least a portion of the hydroxyl groups of the at least one oligomeric polyol component and at least a portion of the hydroxy groups of the at least one monomeric polyol with the polyisocyanate.
27. The composition of claim 1 wherein the at least one monomeric polyol is a polyether polyol.