CA2061199C - Heat stable polyurethane foams - Google Patents
Heat stable polyurethane foams Download PDFInfo
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- CA2061199C CA2061199C CA002061199A CA2061199A CA2061199C CA 2061199 C CA2061199 C CA 2061199C CA 002061199 A CA002061199 A CA 002061199A CA 2061199 A CA2061199 A CA 2061199A CA 2061199 C CA2061199 C CA 2061199C
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- polyol
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
- C08G18/72—Polyisocyanates or polyisothiocyanates
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
Low density polyurethane foams having improved resistance to degradation of properties of compression set and flexibility when exposed to elevated temperatures and pressures are made by reacting a polyisocyanate of about 2.3 to 2.7 functionality at an isocyanate index of about 1.0 with a blend of polyols, catalysts, blowing agents and the like in which the polyols are a mixture of a polyether polyol having a molecular weight of at least 5,000 and a polymer polyol, and the catalysts are a mixture of a major portion of an amine catalyst and a minor portion of a metal catalyst. The foams made by this invention are particularly well suited for use as components of sport shoes that are assembled by vulcanization.
Description
TITLE OF '~'HE IIwENTION
Meat Stable Polyurethane Foams.
$ACKGROUND OF THE ~2lyEENTION
1. Field of the invention. .
This invention relates to low density polyurethane foams and, more particularly, this invention relates to molded foamed polyurethanes that are formulated to better retain certain of their physical properties after exposure to .
elevated temperatures and pressures.
Meat Stable Polyurethane Foams.
$ACKGROUND OF THE ~2lyEENTION
1. Field of the invention. .
This invention relates to low density polyurethane foams and, more particularly, this invention relates to molded foamed polyurethanes that are formulated to better retain certain of their physical properties after exposure to .
elevated temperatures and pressures.
2. definitions.
The following terms as eased in the specification and~claims, are defined as follows:
1r L~. A foot~-shaped form on which the parts of a shoe are assembled to make a shoe.
~ The part of a shoe that encases the foot 9 3. Outsole. The bottom part of a shoe that fakes contact with the ground. , 4. Midsole. A cushioning material between the upper and the outsole.
The following terms as eased in the specification and~claims, are defined as follows:
1r L~. A foot~-shaped form on which the parts of a shoe are assembled to make a shoe.
~ The part of a shoe that encases the foot 9 3. Outsole. The bottom part of a shoe that fakes contact with the ground. , 4. Midsole. A cushioning material between the upper and the outsole.
5. Insole. A pad, often removable, on which the foot rests inside the shoe. It is sometimes called the sock liner or the footbed.
6. Sport Shoe. Casual footwear that is generally constructed with a rubber sole bonded, as opposed to sewn, to a cloth (canvas), rubber or leather upper. Examples of casual footwear include slip-ons and sneakers and tennis, basketball, running and deck shoes.
7. how Density Foam. A foam having a density less than 0.3 g/cc.
'8. Com~aression Set. A measure of a rubbery compound's retention of its elastic properties expressed as the ratio.of the loss in thickness to the original thickness of a specimen. that is compressed under constant load or constant deflection for a defined period of time at a defined temperature.
The values for compression set as given in this specification and claims are based upon ASTM D-3574, test D, constant deflection .
compression set test using a 50% deflection at 140° C for one and °ne half hours.
S. One Shot Moldincs. A method for making polyurethanes in desired sizes and shapes by reacting a p°lyol blend and an isocyanate in situ in a mold. It differs from two step methods in which a prepolymer is first prepared.
l0. Cald Cure. A molding meth°d in which the mold temperature does not exceed about 60° C.
11. Isocyanate Index. The NCO equivalent divided by the reactive hydrogen equivalent.
12. Polymer Pol~rol. A composition produced by polymerizing one or more olefinically unsaturated monomers dissolved or dispersed in. a polyol in the presence of a free radical catalyst as more fully disclosed, for example, in United States Patent 4,208,3144 13. Vulcanization. A term used in the shoe industry to describe a method of bonding the various components of a sport shoe together :by subjecting the components to elevated temperatures and pressures as they are assembled around a last.
The term as so used in the shoe industry may or may not accurately reflect the ordinary meaning of vulcanization as used and understood in the rubber industry.
3. Description of the Prior Art.
This invention relates to one shot molded polyurethane foamed parts that are suitable for use as components for sport shoe. In the ordinary construction of a sport shoe, there may be included between the outer sole and the upper a :number of components such as, for example, innersoles, midsole, ~3nd arch supporters. One shot molded foam polyurethanes are well :suited materials from which to make these intermediate parts ::, .
~~ecause of a number of desirable properties including ):lexibility, resilience and low density. The polyurethanes are also useful because they can be formulated to be soft to the touch and comfortable to the foot.
Tn one method of making sport shoes, the components of the shoe are bonded together with adhesives. By another method of construction, referred to in the trade as vulcanization, the components of the shoe are heated to vulcanization temperatures and the rubber components are cohered, under pressure, to each other. Typically, the vulcanization process is conducted at a temperature of about 140° C for a period of about one and a half hours. As a general rule, the vulcanization method is preferred to the use of adhesives because it is simpler and cheaper. vulcanization is also superior to adhesive bonding in that the shoe is more durable and can be washed, for example, in hot detergents without any concern of dissolving or softening an adhesive. One drawback of the vulcanization procedure is, however, that components such as midsoles, insoles and arch supporters cannot be molded from polyurethanes since the. one shot, low density, foamed polyurethanes known to the prior art cannot survive vulcanizing temperatures and pressures without a substantial diminution in some of their desired physical properties. Arbitrarily the sport shoe industry has established the criteria that if the components of a sports shoe made by vulcanizing are to be useful, they should have a compression set of less than 20% and, for some applications, also should pass a bend test in which the polyurethane foam is heated in a 140~ C oven for ~ne hour and a half and doubled back on itself (180° bend) without breaking immediately after it is taken out of the oven.
One process for making polyurethanes faith a better high temperature property of modulus of torsional elasticity is disclosed in U.S. patent 4,688,410. This gatent makes use of certain urea derivatives reacted with conventional isocyanates and polyols to achieve better high temperature properties and is concerned with dense or foamed polyurethanes with densities above 0.3 g/cc.
It is also known that polyurethanes with improved resistance to thermal degradation can be obtained if polyester polyols are used rather than polyether polyols. However, because polyester polyols are significantly more expensive than polyether polyols and for other reasons, it is preferred to use polyether polyols in making components fox sport shoes.
SUI~AR~ OF THE 2NVENTION
Accordingly, it is an~object of this invention to pravide low density polyurethane foams that display improved resistance~to physical degradation at elevated temperatures and pressures.
Anather object of this invention is to provide polyurethane foams that remain both flexible and resilient after exposure to temperatures of about 140°.
Another object of this invention is to prepare low density foamed polyurethanes from polyether palyols with improved resistance to elevated temperatures.
A further object of this invention is to provide a method for making components of sport shoes from one shot molded low density polyurethanes that substantially maintain desired physical properties under shoe vulcanizing conditions.
These and other objects of this invention are achieved by preparing the polyurethanes from a blend of high molecular weight polyols, catalysts, blowing agents, pigments, stabilizers and the like, and reacting the blend with a polymeric diphenylmethane isocyanate characterized in that: the polyols are a mixture of a high molecular weight polyether polyol and a polymer polyolt the polymeric diphenylmethane isocyanate has a functionality of between about 2.3 and 2.7; the isocyanate index is about l; and the catalysts are a mixture of metal and amine catalysts.
In order to maintain desired properties after exposure to elevated temperatures and pressures, it is necessary to use an isocyanate with a functionality of 2.3 to about 2.7.
If the functionality is greater, the molded article will be too rigid and if lower, the resistance to elevated temperatures and pressures will be sacrificed.
The selectian of the polyol is also important in obtaining the desired temperature and pressure resistance. It has been found that the use of a blend of polyols,.including a high molecular weight polyol and polymer polyol, is necessary.
Modifications in the properties within the scope of this invention are obtained by using either diols or triols as the polyol component of either the high molecular weight polyol or the polymer polyol, provided however, that at least one off, the ...r polyols should be a triol. If,both polyols are triols, the molded polyurethane will maintain good compression set properties after exposures to shoe vulcanization conditions but may be too stiff to pass the 180~ bend test. The ability to pass the 1800 bend test may or not be important depending upon the shoe component that is being made.
Tt is also important in the practice of this invention to use a mixed catalyst system including a minor amount, less than 10% by weight, of a metal catalyst and a major portion, more than 90% by weight, of an amine catalyst. The' combination of the two catalysts provide for the desired reactivity of tie system and the stiffness of the molded article.
A. Procedure.
The open-celled low density foams of the present invention are formed by the reaction of a bland of polyols, catalysts, cross-linkers, blowing-agents, fillers, pigments, stabilizers and the.like, with a polyisacyanate at an isocyanate index of'about ~.. 'The palyols are a mixture of a high molecular weight p0lyether polyol having a molecular weight between about x,000 and 7,000 and a polymer polyol. The isocyanate is a polymeric aromatic isocyanate based upon diphenylmethane diisocyanate having a functionality of between about 2.3 and 2.7. In the preferred embodiments of this example, the high molecular weight polyol is a triol and the polyme'~
~ polyol is a diol. In any case, at least one of the polyols should be a triol.
The blend of the polyols, catalysts, cross linking agents, blowing agents, fillers, pigments, stabilizers, etc. is mechanically mixed at room temperature. Following thorough mixing, the isocyanate is added to the polyol blend, mixed~together and poured into an open mold preheated to 50-600 C. The mold is then closed and the resultant foamed polyurethane is allowed to cure for 6-10 minutes. After this low temperature cure, a foamed product is demolded. The mechanical properties were measured three to five days after demolding.
The shot size, or quantity of reactants charged into the-mold, may be stated as apercentage of the volume of space available which the polyurethane foam must fill.
As is.known, the density and hardness of a molded article will vary with the shot size and a larger shot size will yield a denser, harder article than will a~smaller shot size.
'8. Com~aression Set. A measure of a rubbery compound's retention of its elastic properties expressed as the ratio.of the loss in thickness to the original thickness of a specimen. that is compressed under constant load or constant deflection for a defined period of time at a defined temperature.
The values for compression set as given in this specification and claims are based upon ASTM D-3574, test D, constant deflection .
compression set test using a 50% deflection at 140° C for one and °ne half hours.
S. One Shot Moldincs. A method for making polyurethanes in desired sizes and shapes by reacting a p°lyol blend and an isocyanate in situ in a mold. It differs from two step methods in which a prepolymer is first prepared.
l0. Cald Cure. A molding meth°d in which the mold temperature does not exceed about 60° C.
11. Isocyanate Index. The NCO equivalent divided by the reactive hydrogen equivalent.
12. Polymer Pol~rol. A composition produced by polymerizing one or more olefinically unsaturated monomers dissolved or dispersed in. a polyol in the presence of a free radical catalyst as more fully disclosed, for example, in United States Patent 4,208,3144 13. Vulcanization. A term used in the shoe industry to describe a method of bonding the various components of a sport shoe together :by subjecting the components to elevated temperatures and pressures as they are assembled around a last.
The term as so used in the shoe industry may or may not accurately reflect the ordinary meaning of vulcanization as used and understood in the rubber industry.
3. Description of the Prior Art.
This invention relates to one shot molded polyurethane foamed parts that are suitable for use as components for sport shoe. In the ordinary construction of a sport shoe, there may be included between the outer sole and the upper a :number of components such as, for example, innersoles, midsole, ~3nd arch supporters. One shot molded foam polyurethanes are well :suited materials from which to make these intermediate parts ::, .
~~ecause of a number of desirable properties including ):lexibility, resilience and low density. The polyurethanes are also useful because they can be formulated to be soft to the touch and comfortable to the foot.
Tn one method of making sport shoes, the components of the shoe are bonded together with adhesives. By another method of construction, referred to in the trade as vulcanization, the components of the shoe are heated to vulcanization temperatures and the rubber components are cohered, under pressure, to each other. Typically, the vulcanization process is conducted at a temperature of about 140° C for a period of about one and a half hours. As a general rule, the vulcanization method is preferred to the use of adhesives because it is simpler and cheaper. vulcanization is also superior to adhesive bonding in that the shoe is more durable and can be washed, for example, in hot detergents without any concern of dissolving or softening an adhesive. One drawback of the vulcanization procedure is, however, that components such as midsoles, insoles and arch supporters cannot be molded from polyurethanes since the. one shot, low density, foamed polyurethanes known to the prior art cannot survive vulcanizing temperatures and pressures without a substantial diminution in some of their desired physical properties. Arbitrarily the sport shoe industry has established the criteria that if the components of a sports shoe made by vulcanizing are to be useful, they should have a compression set of less than 20% and, for some applications, also should pass a bend test in which the polyurethane foam is heated in a 140~ C oven for ~ne hour and a half and doubled back on itself (180° bend) without breaking immediately after it is taken out of the oven.
One process for making polyurethanes faith a better high temperature property of modulus of torsional elasticity is disclosed in U.S. patent 4,688,410. This gatent makes use of certain urea derivatives reacted with conventional isocyanates and polyols to achieve better high temperature properties and is concerned with dense or foamed polyurethanes with densities above 0.3 g/cc.
It is also known that polyurethanes with improved resistance to thermal degradation can be obtained if polyester polyols are used rather than polyether polyols. However, because polyester polyols are significantly more expensive than polyether polyols and for other reasons, it is preferred to use polyether polyols in making components fox sport shoes.
SUI~AR~ OF THE 2NVENTION
Accordingly, it is an~object of this invention to pravide low density polyurethane foams that display improved resistance~to physical degradation at elevated temperatures and pressures.
Anather object of this invention is to provide polyurethane foams that remain both flexible and resilient after exposure to temperatures of about 140°.
Another object of this invention is to prepare low density foamed polyurethanes from polyether palyols with improved resistance to elevated temperatures.
A further object of this invention is to provide a method for making components of sport shoes from one shot molded low density polyurethanes that substantially maintain desired physical properties under shoe vulcanizing conditions.
These and other objects of this invention are achieved by preparing the polyurethanes from a blend of high molecular weight polyols, catalysts, blowing agents, pigments, stabilizers and the like, and reacting the blend with a polymeric diphenylmethane isocyanate characterized in that: the polyols are a mixture of a high molecular weight polyether polyol and a polymer polyolt the polymeric diphenylmethane isocyanate has a functionality of between about 2.3 and 2.7; the isocyanate index is about l; and the catalysts are a mixture of metal and amine catalysts.
In order to maintain desired properties after exposure to elevated temperatures and pressures, it is necessary to use an isocyanate with a functionality of 2.3 to about 2.7.
If the functionality is greater, the molded article will be too rigid and if lower, the resistance to elevated temperatures and pressures will be sacrificed.
The selectian of the polyol is also important in obtaining the desired temperature and pressure resistance. It has been found that the use of a blend of polyols,.including a high molecular weight polyol and polymer polyol, is necessary.
Modifications in the properties within the scope of this invention are obtained by using either diols or triols as the polyol component of either the high molecular weight polyol or the polymer polyol, provided however, that at least one off, the ...r polyols should be a triol. If,both polyols are triols, the molded polyurethane will maintain good compression set properties after exposures to shoe vulcanization conditions but may be too stiff to pass the 180~ bend test. The ability to pass the 1800 bend test may or not be important depending upon the shoe component that is being made.
Tt is also important in the practice of this invention to use a mixed catalyst system including a minor amount, less than 10% by weight, of a metal catalyst and a major portion, more than 90% by weight, of an amine catalyst. The' combination of the two catalysts provide for the desired reactivity of tie system and the stiffness of the molded article.
A. Procedure.
The open-celled low density foams of the present invention are formed by the reaction of a bland of polyols, catalysts, cross-linkers, blowing-agents, fillers, pigments, stabilizers and the.like, with a polyisacyanate at an isocyanate index of'about ~.. 'The palyols are a mixture of a high molecular weight p0lyether polyol having a molecular weight between about x,000 and 7,000 and a polymer polyol. The isocyanate is a polymeric aromatic isocyanate based upon diphenylmethane diisocyanate having a functionality of between about 2.3 and 2.7. In the preferred embodiments of this example, the high molecular weight polyol is a triol and the polyme'~
~ polyol is a diol. In any case, at least one of the polyols should be a triol.
The blend of the polyols, catalysts, cross linking agents, blowing agents, fillers, pigments, stabilizers, etc. is mechanically mixed at room temperature. Following thorough mixing, the isocyanate is added to the polyol blend, mixed~together and poured into an open mold preheated to 50-600 C. The mold is then closed and the resultant foamed polyurethane is allowed to cure for 6-10 minutes. After this low temperature cure, a foamed product is demolded. The mechanical properties were measured three to five days after demolding.
The shot size, or quantity of reactants charged into the-mold, may be stated as apercentage of the volume of space available which the polyurethane foam must fill.
As is.known, the density and hardness of a molded article will vary with the shot size and a larger shot size will yield a denser, harder article than will a~smaller shot size.
.. , _ 1 ) B. The reactive Mixture. Grams T~-iANC)LTM DP-1373 (6000 MW Triol) 60 NI~M 24-32 !Diol Polymer Polyol) 4 0 WATER 1.0 FOMREZTM UL-1 (Catalyst) 0.01 DABCO'1'M 33-LV (Catalyst) 0.4 DABCO'~M 8154 (Catalyst) L-5309 (Surfactant) 1.0 F-11 (Blowing Agent) . 1.0 PAPI - 94 :(Polymeric Isocyanate) 21.9 (Index =
1) C. Definitions of the.Reactants.
THANOLTM DP-1373 Polyol (Arco Chemical) . A
6,000 molecular weight triol.
NIA~'N~ 24-32 Polymer Polyol (Union Carbide) . A
polymer polyol which is a capped primary hydroxol diol. The molecular weight of the base polyol is 2800, it has an hydroxol number of 32 and it contains about 10% by weight each of acrylonitrile and styrene.
FOMRETTM UL-1 Catalyst (Witco Chemical Corporation Organics Division). A dibutyltin sulfide dissolved in a plasticizer.
DABCOT°' 33LV Catalyst (Air Products &
Chemicals). A clear, colorless, nonaqueous solution containing one part by weight DABCOTM(a crystalline triethylenediamine, a high-purity tertiary amine.) and two parts dipropylene glycol.
1) C. Definitions of the.Reactants.
THANOLTM DP-1373 Polyol (Arco Chemical) . A
6,000 molecular weight triol.
NIA~'N~ 24-32 Polymer Polyol (Union Carbide) . A
polymer polyol which is a capped primary hydroxol diol. The molecular weight of the base polyol is 2800, it has an hydroxol number of 32 and it contains about 10% by weight each of acrylonitrile and styrene.
FOMRETTM UL-1 Catalyst (Witco Chemical Corporation Organics Division). A dibutyltin sulfide dissolved in a plasticizer.
DABCOT°' 33LV Catalyst (Air Products &
Chemicals). A clear, colorless, nonaqueous solution containing one part by weight DABCOTM(a crystalline triethylenediamine, a high-purity tertiary amine.) and two parts dipropylene glycol.
_. ) DABCO 8154 Catalyst (Air Products &
Chemicals). A chemically (amine) blocked delayed action catalyst used to delay cream time.
L-5309 Surfactant (Union Carbide Corporation). A polyoxyethylene-polysiloxane surfactant having a specific gravity of x..00 and a viscosity of 225 cps, at 25 degrees Celcius.
FREON ~.5. Mowing Agent (Dupont) .
Fluorotrichloromethane.
PApI 94 Ise~cyanate (Dow Chemical Corporation).' A polymeric MDI product.derived from the reaction of carbonylchloride with an aniline-formaldehyde condensate. It has.a functionality of 2.3, an isocyanate equivalent of 131 and ~an NCO content of 32~ by weight.
D. Results.
A polyurethane foam made in accordance with the above procedure was faund to have a density of 0.28 g/ec, a .
hardness of S5-60 Shore (00) and a ball rebound resiliency of 58-62~. The compression set measured as defined above was 5.90.
The compression set was again measured at 70o C for 22 hours and at room temperature for 72 hours and found to be 3.2% and 2.0%
respectively. These amounts of compression set are acceptable to the shoe industry for use as components in sport shoes of vulcanized construction.
Additional samples of the foamed polyurethane were heated in an 140° C oven for one and one half hours and then bent 180~ immediately after they were removed. The samples survived the bend test without breaking or cracking.
The linear shrinkage at 160° for one hour of polyurethanes made as above-described was measured to be less than 0.5% and the high temperature sag Was 0.12 inches (as determined by ASTM D-3769 with a 4 inch overhang at 120° C for one hour).
Chemicals). A chemically (amine) blocked delayed action catalyst used to delay cream time.
L-5309 Surfactant (Union Carbide Corporation). A polyoxyethylene-polysiloxane surfactant having a specific gravity of x..00 and a viscosity of 225 cps, at 25 degrees Celcius.
FREON ~.5. Mowing Agent (Dupont) .
Fluorotrichloromethane.
PApI 94 Ise~cyanate (Dow Chemical Corporation).' A polymeric MDI product.derived from the reaction of carbonylchloride with an aniline-formaldehyde condensate. It has.a functionality of 2.3, an isocyanate equivalent of 131 and ~an NCO content of 32~ by weight.
D. Results.
A polyurethane foam made in accordance with the above procedure was faund to have a density of 0.28 g/ec, a .
hardness of S5-60 Shore (00) and a ball rebound resiliency of 58-62~. The compression set measured as defined above was 5.90.
The compression set was again measured at 70o C for 22 hours and at room temperature for 72 hours and found to be 3.2% and 2.0%
respectively. These amounts of compression set are acceptable to the shoe industry for use as components in sport shoes of vulcanized construction.
Additional samples of the foamed polyurethane were heated in an 140° C oven for one and one half hours and then bent 180~ immediately after they were removed. The samples survived the bend test without breaking or cracking.
The linear shrinkage at 160° for one hour of polyurethanes made as above-described was measured to be less than 0.5% and the high temperature sag Was 0.12 inches (as determined by ASTM D-3769 with a 4 inch overhang at 120° C for one hour).
Claims (19)
1. A polyurethane foam composition that has a bulk density of less than about 0.3 grams per cubic centimeter which composition comprises the reaction product of a. at least one high molecular weight polyether polyol, b. at least one polymer polyol, c. a catalyst blend comprising more than 90% by weight of an amine catalyst and less than 10% by weight of a metal catalyst, d. at least one blowing agent and e. a polymeric diphenylmethane isocyanate under urethane forming reaction conditions, having a functionality of between about
2.3 and 2.7 and an isocyanate index of about 1.
2. A composition according to claim 1 wherein the polymeric diphenylmethane isocyanate has a functionality from about 2.3 to 2.7 and an isocyanate index of about 1.
2. A composition according to claim 1 wherein the polymeric diphenylmethane isocyanate has a functionality from about 2.3 to 2.7 and an isocyanate index of about 1.
3. A composition according to claim 1 wherein the high molecular weight polyether polyol has a polyol component that is either a diol or a triol.
4. A composition according to claim 1 wherein the polymer polyol has a polyol component that is either a diol or a triol.
5. A composition according to claim 1 wherein the polyol mixture is comprised of a major portion of a high molecular weight polyether triol and a minor portion of a diol polymer polyol.
6. A composition according to claim 1 wherein the polymer polyol comprises about 60% of a polyether triol and about 40% of a diol polymer polyol.
7. A composition according to claim 1 wherein the high molecular weight polyether polyol has a molecular weight of at least about 5,000.
8. A composition according to claim 1 wherein the compression set of the composition is less than 10%.
9. A composition according to claim 1 wherein the composition does not break when bent 180° immediately after it has been heated in an oven to 140°C for about one and one half hours.
10. A method of making a polyurethane foam composition that has a bulk density of less than about 0.3 grams per cubic centimeter which method comprises a. forming a reactive blend of i. at least one high molecular weight polyether polyol, ii. at least one polymer polyol, iii. a catalyst blend comprising more than 90% by weight of an amine catalyst and less than 10% by weight of a metal catalyst and iv. at least one blowing agent and b. reacting the reactive blend with a polymeric diphenylmethane isocyanate, having a functionality of between about 2.3 and 2.7 and an isocyanate index of about 1.
11. A method according to claim 10 wherein the polymeric diphenylmethane isocyanate has a functionality from about 2.3 to about 2.7 and an isocyanate index of about 1.
12. A method according to claim 10 wherein the high molecular weight polyether polyol has a polyol component that is either a diol or a triol.
13. A method according to claim 10 wherein the polymer polyol has a polyol component that is either a diol or a triol.
14. A method according to claim 10 wherein the polymer polyol is comprised of a major portion of a high molecular weight polyether triol and a minor portion of a diol polymer polyol.
15. A method according to claim 10 wherein the polymer polyol comprises about 60% of a polyether triol and about 40% of a diol polymer polyol.
16. A method according to claim 10 wherein the high molecular weight polyether polyol has a molecular weight of at least about 5,000.
17. A molded polyurethane component made in accordance with the method of claim 10 wherein the compression set of the molded polyurethane component is less than 10%.
18. A molded polyurethane component made in accordance with claim 10 wherein the molded polyurethane component does not break when bent 180°
immediately after it has been heated in an oven to 140°C for one and one half hours.
immediately after it has been heated in an oven to 140°C for one and one half hours.
19. A vulcanized polyurethane composition that comprises the vulcanization product of a polyurethane composition that has a bulk density of less than about 0.3 grams per cubic centimeter and comprises the reaction product of a. at least one high molecular weight polyether polyol, b. at least one polymer polyol, c. a catalyst blend comprising more than 90% by weight of an amine catalyst and less than 10% by weight of a metal catalyst, d. at least one blowing agent and e. a polymeric diphenylmethane isocyanate having a functionality from about 2.3 to about 2.7 and an isocyanate index of about 1 under urethane forming reaction conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002061199A CA2061199C (en) | 1992-02-24 | 1992-02-24 | Heat stable polyurethane foams |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA002061199A CA2061199C (en) | 1992-02-24 | 1992-02-24 | Heat stable polyurethane foams |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2061199A1 CA2061199A1 (en) | 1993-08-25 |
| CA2061199C true CA2061199C (en) | 2002-07-16 |
Family
ID=4149254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002061199A Expired - Fee Related CA2061199C (en) | 1992-02-24 | 1992-02-24 | Heat stable polyurethane foams |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2061199C (en) |
-
1992
- 1992-02-24 CA CA002061199A patent/CA2061199C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2061199A1 (en) | 1993-08-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |