US4048104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyisocyanate prepolymers from scrap polyester and polyurethane foam products obtained therefrom
Assignee: Cook Composites and Polymers Co
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Filing: 1976-08-05
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Granted: 1977-09-13
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Expires: 1996-08-05
Abstract
Abstract Polyisocyanate prepolymers for use in preparing polyurethane products elastomers, adhesives and foams, are prepared by combining (1) organic polyisocyanate with (2) polyols which are the hydroxyl-terminated digestion products of (a) waste or scrap polyalkylene terephthalate polymers and (b) organic polyols. Polyurethane products resulting from the polyisocyanate prepolymers exhibit useful and unexpected properties.
Inventors
- 👤 Glenn R. Svoboda
- 👤 John T. Suh
- 👤 William L. Carlstrom
- 👤 Gary L. Maechtle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:04
CPC Classifications
C; C08; C08J; C08J11/00; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08J2367/00; C08J2367/02; Y; Y10; Y10S; Y10S528/00; Y10S528/905; Y10S528/906
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
The method of preparing a polyisocyanate prepolymer comprising A. digesting polyalkylene terephthalate having a molecular weight greater than 15,000 in a reactive solvent selected from the class consisting of organic diols and triols having a molecular weight from 62 to 500 until the digestion product is soluble in acetone at room temperature; B. reacting the said digestion product with an organic polyisocyanate to produce a polyisocyanate-terminated prepolymer substantially free of unreacted hydroxyl radicals.
Claim 2
Independent Claim
73 words
The method of preparing a polyisocyanate prepolymer comprising A. digesting polyalkylene terephthalate having a molecular weight greater than 15,000 in a reactive solvent selected from the class consisting of organic diols and triols having a molecular weight from 62 to 500 until the digestion product is soluble in acetone at room temperature; B. reacting the said digestion product with an organic polyisocyanate to produce a polyisocyanate-terminated prepolymer substantially free of unreacted hydroxyl radicals.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein the said polyalkylene terephthalate is polyethylene terephthalate.
Claim 4
Dependent Claim
13 words
The method of claim 1 wherein the said reactive solvent is polypropylene glycol.
Claim 5
Dependent Claim
13 words
The method of claim 1 wherein the said reactive solvent is polyethylene glycol.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the said reactive solvent is bis(2-hydroxy-ethoxy-ethyl)glutarate.
Claim 7
Dependent Claim
13 words
The method of claim 1 wherein the said reactive solvent is diethylene glycol.
Claim 8
Dependent Claim
13 words
The method of claim 1 wherein the said reactive solvent is dipropylene glycol.
Claim 9
Dependent Claim
22 words
The method of claim 1 wherein the said reactive solvent is mixed ether-ester triol having a molecular weight of less than 500.
Claim 10
Dependent Claim
13 words
The method of claim 1 wherein the said organic polyisocyanate is toluene diisocyanate.
Claim 11
Dependent Claim
35 words
The method of preparing a polyurethane product comprising mixing together under reactive conditions: A, the polyisocyanate prepolymer of claim 1; B. an organic polyol; C. a catalyst for the reaction of hydroxy and isocyanate radicals.
Claim 12
Dependent Claim
14 words
The method of claim 10 wherein the said organic polyol is a polyether polyol.
Claim 13
Dependent Claim
18 words
The method of claim 11 wherein the said polyether polyol has a molecular weight of 1,000 to 6,500.
Claim 14
Dependent Claim
8 words
A polyisocyanate prepolymer prepared according to claim 1.
Claim 15
Dependent Claim
22 words
A polyurethane foam prepared by adding a blowing agent to the ingredients recited in claim 11 prior to carrying out the method.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-12 | 1981-03-14 | 1981-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-12 | 1985-03-14 | 1985-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-12 | 1989-03-14 | 1989-09-13 | $7700.00 | Window Closed / Lapsed |