Polyurethane foams comprising phosphorus compounds
The present invention relates to polyurethanes obtained by mixing to give a reaction mixture of (a) polyisocyanate, (b) polymeric compounds having groups reactive toward isocyanates, (c) catalysts comprising incorporable amine catalysts, (d) phosphoric esters, polyphosphates, phosphonic esters, and/or phosphorous esters, and optionally (e) blowing agents, (f) chain extenders and/or crosslinking agents, and (h) auxiliaries and/or additives, and completing the reaction of the reaction mixture to give the polyurethane. The invention further relates to a process for producing these polyurethanes and to their use in automobile interiors.
1. A polyurethane foam obtained by a process comprising:
mixing a reaction mixture comprising
(a) polyisocyanate,
(b) a polymeric compound comprising a group reactive toward isocyanates,
(c) a catalyst composition consisting of at least one reactive amine catalyst and optionally one or more organometallic compounds,
(d) at least one of a phosphoric ester, a polyphosphate, a phosphonic ester, and a phosphorous ester,
(e) a blowing agent comprising water,
(f) optionally a chain extender, a crosslinking agent, or both, and
(g) optionally an additive, and
reacting the reaction mixture to give the polyurethane foam,
wherein
the phosphoric ester has formula
(R 1 —O) 3 —P═O,
wherein moieties R 1 are independently organic moieties comprising one or more phenyl groups, one or more phosphoric acid groups or esters comprising the phenyl groups, the phosphoric acid groups, and optionally one or more atoms selected from the group consisting of nitrogen, oxygen, fluorine, chlorine, and bromine,
the polyphosphate has formula
—[P(O)(O—R′ + )—O] n —,
wherein n is an integer of from 2 to 10 000 and R′ + is an alkali metal cation or an ammonium cation,
the phosphonic ester has formula
(R 3 )(R 2 —O) 2 —P═O,
wherein moieties R 2 are independently organic moieties comprising one or more atoms selected from the group consisting of nitrogen, oxygen, fluorine, chlorine, and bromine, and moiety R 3 is either hydrogen or aromatic, aliphatic, or cycloaliphatic moieties comprising from 1 to 10 carbon atoms,
the phosphorous ester has formula
(R 4 —O) 3 —P,
wherein moieties R 4 are independently organic moieties comprising one or more atoms selected from the group consisting of nitrogen, oxygen, fluorine, chlorine, and bromine, wherein at least one of the phosphoric ester, the phosphonic ester, or the phosphorus ester is present and comprises a group which is reactive towards an isocyanate group
wherein a proportion of component (d), based on a total volume of components (a) to (f), is smaller than 3% by weight; and
wherein said reactive amine catalyst comprises groups reactive toward isocyanates, and optionally at least one tertiary aliphatic amino group comprising two moieties independently selected from the group consisting of a methyl moiety and an ethyl moiety, and an organic moiety; and
wherein said polyurethane foam comprises less than 2% of further flame retardants.
2. The polyurethane foam according to claim 1 , wherein the group of the phosphoric ester, the phosphonic ester, or the phosphorous ester which is reactive toward an isocyanate group comprises a group which is an OH group.
3. The polyurethane foam according to claim 1 , wherein component (d) comprises compounds comprising at least two phosphate groups.
4. The polyurethane foam according to claim 1 , wherein the polyurethane foam has an average density of from 100 to 850 g/L.
5. The polyurethane foam according to claim 4 , wherein the polyurethane foam is a molded polyurethane foam.
6. The polyurethane foam according to claim 5 , wherein the molded polyurethane foam has an average density of from 150 to 500 g/L.
7. The polyurethane foam according to claim 1 , wherein the polyurethane foam is an automobile interior part.
8. The polyurethane foam according to claim 7 , wherein the automobile interior part is a steering wheel, a dashboard, an interior door cladding, a headrest, or a control button.
9. The polyurethane foam according to claim 1 , comprising no further flame retardants.
10. A process for producing a polyurethane foam, the process comprising:
mixing
a) polyisocyanate,
b) polymeric compounds comprising groups reactive toward isocyanates,
c) a catalyst composition consisting of at least one reactive amine catalyst and optionally one or more organometallic compounds,
d) at least one of a phosphoric ester, a polyphosphate, a phosphonic ester, and a phosphorous ester,
e) blowing agents comprising water,
f) optionally chain extenders, crosslinking agents, or both, and
g) optionally additives,
thereby obtaining a reaction mixture, and
reacting the reaction mixture, thereby obtaining the polyurethane foam,
wherein
the phosphoric ester has formula
(R 1 —O) 3 —P═O,
wherein moieties R 1 are independently organic moieties comprising one or more phenyl groups, one or more phosphoric acid groups or esters comprising the phenyl groups, the phosphoric acid groups, and optionally one or more atoms selected from the group consisting of nitrogen, oxygen, fluorine, chlorine, and bromine,
the polyphosphate has formula
—[P(O)(O—R′ + )—O] n —,
wherein n is an integer of from 2 to 10 000 and R′ + is an alkali metal cation or an ammonium cation,
the phosphonic ester has formula
(R 3 )(R 2 —O) 2 —P═O,
wherein moieties R 2 are independently organic moieties comprising one or more atoms selected from the group consisting of nitrogen, oxygen, fluorine, chlorine, and bromine, and moiety R 3 is either hydrogen or aromatic, aliphatic, or cycloaliphatic moieties comprising from 1 to 10 carbon atoms,
the phosphorous ester has formula
(R 4 —O) 3 —P,
wherein moieties R 4 are independently organic moieties comprising one or more atoms selected from the group consisting of nitrogen, oxygen, fluorine, chlorine, and bromine, wherein at least one of the phosphoric ester, the phosphonic ester, or the phosphorus ester is present and comprises a group which is reactive towards an isocyanate group
wherein a proportion of component (d), based on a total volume of components (a) to (f), is smaller than 3% by weight; and
wherein said reactive amine catalyst comprises groups reactive toward isocyanates, and optionally at least one tertiary aliphatic amino group comprising two moieties independently selected from the group consisting of a methyl moiety and an ethyl moiety, and an organic moiety; and
wherein said polyurethane foam comprises less than 2% of further flame retardants.
11. A method for making an automobile interior, comprising:
employing the polyurethane foam according to claim 1 in an automobile interior in need thereof.
12. The polyurethane foam according to claim 1 , wherein said polyurethane foam comprises less than 1% of further flame retardants.