Process for producing a ring-opening polymerization product
The invention relates to a process for producing a ring-opening polymerization product by reacting at least one polyisocyanate and 2-oxo-1,3-dioxolane-4-carboxylic acid and subjecting the reaction product to a temperature within the range of from about 40 to about 150° C. in the presence of a catalytic amount of at least one non-nucleophilic base. The obtained polymerization product may be present as a foam and is suitable as binder, insulation material, sealant or coating and in the production of mattresses or wound pads.
1. A process for producing a ring-opening polymerization product in the form of an open-cell foam which comprises the steps of:
a) providing a reaction product of at least one polyisocyanate and 2-oxo-1,3-dioxolane-4-carboxylic acid; and
b) subjecting said reaction product to a temperature within the range of from 40 to 150° C. in the presence of a catalytic amount of at least one non-nucleophilic base,
wherein carbon dioxide is cleaved off.
2. The process of claim 1 , wherein the polyisocyanate is selected from an aliphatic isocyanate, an aromatic isocyanate, a cycloaliphatic isocyanate, or a combination thereof, having an —NCO functionality of ≥2.
3. The process of claim 1 , wherein the polyisocyanate is selected from toluylenediisocyanate, isophorondiisocyanate, diphenylmethanediisocyanate, 4,4′-diisocyanato-dicyclohexylmethane, tetramethylenediisocyanate, pentamethylenediisocyanate, hexamethylene-diisocyanate, and mixtures thereof.
4. The process of claim 1 , wherein the polyisocyanate is a polyisocyanate prepolymer which is obtained by reacting a molar excess of a polyisocyanate with a polyol, wherein the polyisocyanate:
i.) is selected from an aliphatic isocyanate, an aromatic isocyanate, a cycloaliphatic isocyanate, or a combination thereof, having an —NCO functionality of ≥2; or
ii.) is selected from toluylenediisocyanate, isophorondiisocyanate, diphenylmethanediisocyanate, 4,4′-diisoyanatodicyclohexylmethane, tetramethylene diisocyanate, pentamethylenediisocyanate, hexamethylenediisocyanate, and mixtures thereof.
5. The process of claim 4 , wherein the polyol has an average OH functionality of 2 to 8.
6. The process of claim 5 , wherein the polyol is a poly-C 2-4 -alkylenoxide having a number average molecular weight Mn in the range of from 400 to 10000.
7. The process of claim 1 , wherein the reaction product of step (a) is obtained by:
(1) reacting the polyisocyanate with an equimolar amount of 2-oxo-1,3-dioxolane-4-carboxylic acid; or by
(2) reacting in a first step a molar excess of the polyisocyanate with 2-oxo-1,3-dioxolane-4-carboxylic acid to obtain an intermediate, and in a second step reacting the intermediate with a polyol, wherein the polyol has an average OH functionality of 2 to 8.
8. The process of claim 7 , wherein the polyol is a poly-C 2-4 -alkylenoxide having a number average molecular weight Mn in the range of from 400 to 10000.
9. The process of claim 1 , wherein the reaction product of step (a) is of formula (I)
wherein R is an x-valent radical derived from said polyisocyanate by formally removing the NCO groups and x is an integer from 2 to 6.
10. The process of claim 1 , wherein step (b) is carried out at a temperature in the range of from 60 to 150° C.
11. The process of claim 1 , wherein the non-nucleophilic base is selected from 1,8-diazabicyclo[5.4.0]undec-7-ene, 1,5-diazobicyclo[4.3.0]non-5-ene, 1,4-diazabicyclo[2.2.2]octane, 2,6-di-tert-butylpyridine, diisopropylethylamine, tetramethylguanidine or mixtures thereof.
12. A process for producing a ring-opening polymerization product in the form of an open-cell foam which comprises the steps of:
a) providing a reaction product of at least one polyisocyanate and 2-oxo-1,3-dioxolane-4-carboxylic acid; and
b) subjecting said reaction product to a temperature within the range of from 40 to 150° C. in the presence of a catalytic amount of at least one non-nucleophilic base,
wherein carbon dioxide is cleaved off;
wherein the reaction product of step (a) is obtained by: (1) reacting the polyisocyanate with an equimolar amount of 2-oxo-1,3-dioxolane-4-carboxylic acid; or by (2) reacting in a first step a molar excess of the polyisocyanate with 2-oxo-1,3-dioxolane-4-carboxylic acid to obtain an intermediate, and in a second step reacting the intermediate with a polyol; and
wherein the polyol has an average OH functionality of 2 to 8; wherein the polyol is a poly-C 2-4 -alkylenoxide having a number average molecular weight Mn in the range of from 400 to 10000.
13. A ring-opening polymerization product in the form of an open-cell foam obtained by the process of claim 1 .
14. The product of claim 13 , wherein the polyisocyanate:
i.) is selected from an aliphatic isocyanate, an aromatic isocyanate, a cycloaliphatic isocyanate, or a combination thereof, having an —NCO functionality of ≥2; or
ii.) is selected from toluylenediisocyanate, isophorondiisocyanate, diphenylmethanediisocyanate, 4,4′-diisocyanatodicyclohexylmethane, tetramethylene diisocyanate, pentamethylenediisocyanate, hexamethylenediisocyanate and mixtures thereof.
15. The product of claim 13 , wherein the non-nucleophilic base is selected from 1,8-diazabicyclo[5.4.0]undec-7-ene, 1,5-diazobicyclo[4.3.0]-non-5-ene, 1,4-diaza bicyclo[2.2.2]octane, 2,6-di-tert-butylpyridine, diisopropylethylamine, tetramethyl guanidine or mixtures thereof.