US4254069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat stable reaction injection molded elastomers
Assignee: Huntsman Corp
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Filing: 1979-04-30
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Granted: 1981-03-03
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Expires: 1999-04-30
Abstract
Abstract The invention is a method for making reaction injection molded polyurethane of improved properties. The product comprises the cured reaction product of a high molecular weight polyhydric polyether, a low molecular weight active hydrogen containing compound of at least two functionality and a polyisocyanate. The reaction product is cured by subjecting it to an ambient temperature of from about 290°-425° F. for a time sufficient to achieve an improvement in properties. The invention is also the resulting polyurethane.
Inventors
- 👤 Richard J. G. Dominguez
- 👤 Doris M. Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:54
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; C08J3/244; B; B29; B29C; B29C67/00; B29C67/24; B29C67/246; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/65; C08G18/66; C08G18/6603; C08G18/82; B29C44/00; B29K; B29K2075/00; C08J2375/00; C08J2375/04; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/83; Y10S521/00; Y10S521/904; Y10S521/914
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
147 words
A method of making a foamed polyurethane elastomer of improved properties which comprises injecting via a RIM machine into a mold cavity of the desired configuration a foam formulation, demolding the molded article and post curing the demolded article at a temperature from about 290° F. to 425° F. for a time sufficient to achieve an improvement in properties said formulation being the reaction product of an aromatic polyisocyanate, a polyol of above about 500 equivalent weight and a chain-extending agent comprising a low molecular weight active hydrogen containing component of at least two (2) functionality wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 2
Independent Claim
147 words
A method of making a foamed polyurethane elastomer of improved properties which comprises injecting via a RIM machine into a mold cavity of the desired configuration a foam formulation, demolding the molded article and post curing the demolded article at a temperature from about 290° F. to 425° F. for a time sufficient to achieve an improvement in properties said formulation being the reaction product of an aromatic polyisocyanate, a polyol of above about 500 equivalent weight and a chain-extending agent comprising a low molecular weight active hydrogen containing component of at least two (2) functionality wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 3
Dependent Claim
12 words
A method of claim 1 wherein said chain-extending agent comprises ethylene glycol.
Claim 4
Dependent Claim
12 words
A method of claim 1 wherein said aromatic polyisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 5
Dependent Claim
34 words
A method of claim 1 wherein said polyol is a diol or triol having an equivalent weight of from about 1000 to about 3000 and contains at least about 50 percent primary hydroxyl groups.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein said polyol is a polyether polyol.
Claim 7
Dependent Claim
138 words
In a method for making a polyurethane elastomer of improved properties wherein a polyol of above about 500 equivalent weight, an aromatic polyisocyanate and a chain-extending agent comprising a low molecular weight active hydrogen containing compound of at least two (2) functionality is injected into a mold cavity of the desired configuration wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product wherein a molded article is formed the improvement which comprises post curing the molded article at a temperature of about 290° F. to 425° F. for a time sufficient to achieve an improvement in properties.
Claim 8
Dependent Claim
138 words
In a method for making a polyurethane elastomer of improved properties wherein a polyol of above about 500 equivalent weight, an aromatic polyisocyanate and a chain-extending agent comprising a low molecular weight active hydrogen containing compound of at least two (2) functionality is injected into a mold cavity of the desired configuration wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product wherein a molded article is formed the improvement which comprises post curing the molded article at a temperature of about 290° F. to 425° F. for a time sufficient to achieve an improvement in properties.
Claim 9
Dependent Claim
135 words
In a method for making a polyurethane elastomer of improved properties wherein a polyol of above about 500 equivalent weight, an aromatic polyisocyanate and a chain-extending agent comprising a low molecular weight active hydrogen containing compound of at least two (2) functionality is injected into a mold cavity of the desired configuration wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product wherein a molded article is formed the improvement which comprises post curing the molded article at a temperature of about 310° F. for a time sufficient to achieve an improvement in properties.
Claim 10
Dependent Claim
135 words
In a method for making a polyurethane elastomer of improved properties wherein a polyol of above about 500 equivalent weight, an aromatic polyisocyanate and a chain-extending agent comprising a low molecular weight active hydrogen containing compound of at least two (2) functionality is injected into a mold cavity of the desired configuration wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product wherein a molded article is formed the improvement which comprises post curing the molded article at a temperature of about 310° F. for a time sufficient to achieve an improvement in properties.
Claim 11
Independent Claim
147 words
A method of making a foamed polyurethane elastomer of improved properties which comprises injecting via a RIM machine into a mold cavity of the desired configuration a foam formulation, demolding the molded article and post curing the demolded article at a temperature from about 310° F. to 350° F. for a time sufficient to achieve an improvement in properties said formulation being the reaction product of an aromatic polyisocyanate, a polyol of above about 500 equivalent weight and a chain-extending agent comprising a low molecular weight active hydrogen containing component of at least two (2) functionality wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 12
Independent Claim
147 words
A method of making a foamed polyurethane elastomer of improved properties which comprises injecting via a RIM machine into a mold cavity of the desired configuration a foam formulation, demolding the molded article and post curing the demolded article at a temperature from about 310° F. to 350° F. for a time sufficient to achieve an improvement in properties said formulation being the reaction product of an aromatic polyisocyanate, a polyol of above about 500 equivalent weight and a chain-extending agent comprising a low molecular weight active hydrogen containing component of at least two (2) functionality wherein the polyisocyanate and chain-extender are chosen from products which yield an isocyanate chain-extender reaction product with a glass transition temperature of above about 325° F. and wherein the polyol is chosen from those products which do not significantly adversely affect the glass transition temperature of the isocyanate chain-extender reaction product.
Claim 13
Dependent Claim
12 words
A method of claim 8 wherein said chain-extending agent comprises ethylene glycol.
Claim 14
Dependent Claim
12 words
A method of claim 8 wherein said aromatic polyisocyanate is 4,4'-diphenylmethane diisocyanate.
Claim 15
Dependent Claim
34 words
A method of claim 8 wherein said polyol is a diol or triol having an equivalent weight of from about 1000 to about 3000 and contains at least about 50 percent primary hydroxyl groups.
Claim 16
Dependent Claim
12 words
The method of claim 8 wherein said polyol is a polyether polyol.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-02 | 1984-09-01 | 1985-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-02 | 1988-09-01 | 1989-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-02 | 1992-09-01 | 1993-03-03 | $7700.00 | Window Closed / Lapsed |