High viscosity surfactants for the manufacture of polyurethane foams
First Claim
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1. A method of manufacturing polyurethane foam comprising:
- 1) preparing a mixture comprising;
(a) a siloxane-oxyalkylene copolymer having the general formula M"Dx D"y M" wherein;
M" represents (CH3)3 SiO1/2 or R(CH3)2 SiO1/2 ;
D represents (CH3)2 SiO2/2 ;
D" represents (CH3)(R)SiO2/2 ;
x is 81-220, y is 8-40, and x/y<
10;
R is a polyether-containing substituent derived from a blend of Cn H2n -started polyethers selected from the following two groups such that the overall average molecular mass of the polyethers in the surfactant are in the range 1100-1800;
(i) --Cn H2n O(C2 H4 O)a (C3 H6 O)b R" moieties having a blend average molecular mass in the range 2000-6000, and wherein;
at least one polyether of type (i) has a molecular weight above 3000;
n is 3-10;
a is a number such that ethylene oxide residues constitute greater than or equal to 30%, but less than or equal to 50%, by weight of the alkylene oxide residues of the polyether;
b is a number such that propylene oxide residues constitute less than or equal to 70%, but greater than 50% by weight, of the alkylene oxide residues of the polyether;
R" represents --H, an alkyl group of 1-4 carbon atoms, --C(O)R'"'"'", --C(O)OR'"'"'" or --C(O)NHR'"'"'"; and
R'"'"'" represents mono-functional alkyl or aryl groups; and
(ii) --Cn H2n O(C2 H4 O)a '"'"'(C3 H6 O)b '"'"'R" moieties having average molecular masses in the range 300-750, and wherein;
n'"'"' is 3-10;
a'"'"' is 30 to a number such that ethylene oxide residues constitute 30% to 100% by weight of the alkylene oxide residues of the polyether; and
b'"'"' is 0 to a number such that propylene oxide residues constitute less than or equal to 70% by weight of the alkylene oxide residues of the polyether; and
R" is as defined above; and
(b) a diluent in an amount sufficient to reduce the viscosity of the mixture to less than 3,000 cP;
2) preparing a mixture comprising;
(a) a polyether polyol containing an average of more than two hydroxyl groups per molecule;
(b) an organic diisocyanate;
(c) at least one catalyst for production of polyurethane foam;
(d) water;
(e) the mixture made in step (1); and
(f) optionally, reduced or no blowing agent;
2) allowing the mixture made in step (2) to foam; and
3) curing the foamed composition.
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Abstract
The present invention discloses high viscosity surfactants which may be used, when diluted to a viscosity below 2500 cP at 25° C., as surfactants for the production of polyuretahne foam. Specifically, the surfactants of the present invention have the generalized average formula M*Dx D"y M* wherein
M* is (CH3)3 SiO1/2 or R(CH3)2 SiO1/2 ;
M" is R(CH3)2 SiO1/2 ;
D is (CH3)2 SIO2/2 ;
D" is (CH3)(R)SiO2/2 ;
x is 81-220, y is 8-40 and D/(D"+M")≦10;
R is a polyether-containing substituent derived from a blend of Cn H2n -started polyethers selected from two different groups such that the average molecular mass is 1100-1800.
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Citations
9 Claims
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1. A method of manufacturing polyurethane foam comprising:
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1) preparing a mixture comprising; (a) a siloxane-oxyalkylene copolymer having the general formula M"Dx D"y M" wherein; M" represents (CH3)3 SiO1/2 or R(CH3)2 SiO1/2 ; D represents (CH3)2 SiO2/2 ; D" represents (CH3)(R)SiO2/2 ; x is 81-220, y is 8-40, and x/y<
10;R is a polyether-containing substituent derived from a blend of Cn H2n -started polyethers selected from the following two groups such that the overall average molecular mass of the polyethers in the surfactant are in the range 1100-1800; (i) --Cn H2n O(C2 H4 O)a (C3 H6 O)b R" moieties having a blend average molecular mass in the range 2000-6000, and wherein; at least one polyether of type (i) has a molecular weight above 3000; n is 3-10; a is a number such that ethylene oxide residues constitute greater than or equal to 30%, but less than or equal to 50%, by weight of the alkylene oxide residues of the polyether; b is a number such that propylene oxide residues constitute less than or equal to 70%, but greater than 50% by weight, of the alkylene oxide residues of the polyether; R" represents --H, an alkyl group of 1-4 carbon atoms, --C(O)R'"'"'", --C(O)OR'"'"'" or --C(O)NHR'"'"'"; and R'"'"'" represents mono-functional alkyl or aryl groups; and (ii) --Cn H2n O(C2 H4 O)a '"'"'(C3 H6 O)b '"'"'R" moieties having average molecular masses in the range 300-750, and wherein; n'"'"' is 3-10; a'"'"' is 30 to a number such that ethylene oxide residues constitute 30% to 100% by weight of the alkylene oxide residues of the polyether; and b'"'"' is 0 to a number such that propylene oxide residues constitute less than or equal to 70% by weight of the alkylene oxide residues of the polyether; and R" is as defined above; and (b) a diluent in an amount sufficient to reduce the viscosity of the mixture to less than 3,000 cP; 2) preparing a mixture comprising; (a) a polyether polyol containing an average of more than two hydroxyl groups per molecule; (b) an organic diisocyanate; (c) at least one catalyst for production of polyurethane foam; (d) water; (e) the mixture made in step (1); and (f) optionally, reduced or no blowing agent; 2) allowing the mixture made in step (2) to foam; and 3) curing the foamed composition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification
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Current AssigneeGeneral Electric Company
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Original AssigneeOSI Specialties, Inc. (MPM Holdings, Inc.)
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InventorsKirchner, David L., Miller, Glenn A., McVey, Susan B.
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Primary Examiner(s)Foelak, Morton
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Application NumberUS08/436,788Time in Patent Office274 DaysField of Search521/112US Class Current521/112CPC Class CodesC08G 77/46 containing polyether sequences
