US3905925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing polyurethane products
Assignee: Shell USA Inc
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Filing: 1974-02-25
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Granted: 1975-09-16
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Expires: 1994-02-25
Abstract
Abstract The present invention is concerned with a process for preparing polyurethane products, which may be solid polyurethane products or microcellular foam polyurethane products, from quasi-hydroxylprepolymers and quasi-isocyanate prepolymers (sometimes also called semi-prepolymers).
Inventors
- 👤 Christiaan Vervloet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:07
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/10; C08G18/12
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
211 words
A PROCESS FOR PREPARING POLYURETHANE PRODUCTS WHICH COMPRISES CONTACTING A QUASI-HYDROXYL PREPOLYMER WITH A MOLAR EXCESS OF QUASI-ISOCYANATE PREPOLYMER WHEREIN THE RESULTING MIXTURE WAS TERMINAL ISOCYANATE GROUPS AND THE ISOCYANATE INDEX OF THE RESULTING MIXTURE IS ABOVE 100 AND LESS THAN 115, AND WHEREIN: A. THE QUASI-ISOCYANATE PREPOLYMER IS OBTAINED BY CONTACTING I. A DI-ISOCYANATE HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 100 TO 500, WITH II. A HIGH MOLECULAR WEIGHT DIOL HAVING AN AVERAGE MOLEC ULAR WEIGHT OF FROM 500 TO 4500 WHEREIN THE AMOUNT OF DI-ISOCYANATE IS FROM 3 TO 12 MOLES PER MOLE OF HIGH MOLECULAR WEIGHT DIOL, AND B. THE QUASI-HYDROXYL PREPOLYMER IS OBTAINED BY CONTACTING I. A TRUE-ISOCYANATE PREPOLYMER WHICH IS PREPARED BY CONTACTING A. A DI-ISOCYANATE, HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 100 TO 500, WITH B. A HIGH MOLECULAR WEIGHT DIOL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 500 TO 4,500, WHEREIN THE AMOUNT OF DI-ISOCYANATE IS FROM 1.8 TO 2.2 MOLES PER MOLE OF HIGH MOLECULAR WEIGHT DIOL, WITH II. A LOW MOLECULER WEIGHT DIOL, HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 60 TO 250, WHEREN THE AMOUNT OF LOW MOLECULAR WEIGHT DIOL IS FROM 4 TO 17 MOLES PER MOLE OF HIGH MOLECULAR WEIGHT DIOL USED TO PREPARE THE TRUE-ISOCYANATE PREPOLYMER.
Claim 2
Dependent Claim
211 words
A PROCESS FOR PREPARING POLYURETHANE PRODUCTS WHICH COMPRISES CONTACTING A QUASI-HYDROXYL PREPOLYMER WITH A MOLAR EXCESS OF QUASI-ISOCYANATE PREPOLYMER WHEREIN THE RESULTING MIXTURE WAS TERMINAL ISOCYANATE GROUPS AND THE ISOCYANATE INDEX OF THE RESULTING MIXTURE IS ABOVE 100 AND LESS THAN 115, AND WHEREIN: A. THE QUASI-ISOCYANATE PREPOLYMER IS OBTAINED BY CONTACTING I. A DI-ISOCYANATE HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 100 TO 500, WITH II. A HIGH MOLECULAR WEIGHT DIOL HAVING AN AVERAGE MOLEC ULAR WEIGHT OF FROM 500 TO 4500 WHEREIN THE AMOUNT OF DI-ISOCYANATE IS FROM 3 TO 12 MOLES PER MOLE OF HIGH MOLECULAR WEIGHT DIOL, AND B. THE QUASI-HYDROXYL PREPOLYMER IS OBTAINED BY CONTACTING I. A TRUE-ISOCYANATE PREPOLYMER WHICH IS PREPARED BY CONTACTING A. A DI-ISOCYANATE, HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 100 TO 500, WITH B. A HIGH MOLECULAR WEIGHT DIOL HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 500 TO 4,500, WHEREIN THE AMOUNT OF DI-ISOCYANATE IS FROM 1.8 TO 2.2 MOLES PER MOLE OF HIGH MOLECULAR WEIGHT DIOL, WITH II. A LOW MOLECULER WEIGHT DIOL, HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM 60 TO 250, WHEREN THE AMOUNT OF LOW MOLECULAR WEIGHT DIOL IS FROM 4 TO 17 MOLES PER MOLE OF HIGH MOLECULAR WEIGHT DIOL USED TO PREPARE THE TRUE-ISOCYANATE PREPOLYMER.
Claim 3
Dependent Claim
20 words
A process as claimed in claim 1, wherein the reaction mixture has an isocyanate index of from 101 to 105.
Claim 4
Dependent Claim
34 words
A process as claimed in claim 1, wherein the quasi-isocyanate prepolymer is prepared by a one-stage process, comprising adding from 3 to 12 moles of di-isocyanate to 1 mole of high molecular weight diol.
Claim 5
Dependent Claim
18 words
A process as claimed in claim 3, wherein the amount of di-isocyanate is from 4 to 6 moles.
Claim 6
Dependent Claim
47 words
A process as claimed in claim 1, wherein the quasi-hydroxyl prepolymer is prepared in a one-stage process, comprising adding from 4 to 17 moles of low molecular weight diol to the true-isocyanate prepolymer for each mole of high molecular weight diol used to prepare the true-isocyanate prepolymer.
Claim 7
Dependent Claim
21 words
A process as claimed in claim 5, wherein the amount of low molecular weight diol is from 5 to 9 moles.
Claim 8
Dependent Claim
21 words
A PROCESS AS CLAIMED IN CLAIM 1 FOR THE PREPARATION OF MICROCELLULAR POLYURETHANE, WHEREIN WATER IS INCLUDED IN THE REACTION MIXTURE.
Claim 9
Dependent Claim
27 words
A process as claimed in claim 7, wherein the amount of water is from 0.5 to 1.0 part per hundred parts of quasi-hydroxyl prepolymer plus quasi-isocyanate prepolymer.
Claim 10
Dependent Claim
16 words
A process as claimed in claim 1, wherein poly-tetrahydrofuran diol is premixed with the quasi-hydroxyl prepolymer.
Claim 11
Dependent Claim
22 words
A process as claimed in claim 1, wherein the average molecular weight of the high molecular diol is from 500 to 2,500.
Claim 12
Dependent Claim
17 words
A process as claimed in claim 10, wherein the high molecular weight diol is a poly-1,2-propane diol.
Claim 13
Dependent Claim
23 words
A process as claimed in claim 1, wherein the average molecular weight of the low molecular weight diol is from 60 to 128.
Claim 14
Dependent Claim
23 words
A process as claimed in claim 12, wherein the low molecular weight diol is selected from the group consisting of 1,4-butanediol and 1,6-hexanediol.
Claim 15
Dependent Claim
20 words
A process as claimed in claim 1, wherein the di-isocyanate has an average molecular weight of from 150 to 300.
Claim 16
Dependent Claim
22 words
A process as claimed in claim 14, wherein the di-isocyanate is selected from the group consisting of 4,41-methylene diphenyl di-isocyanate and 1,5-di-isocyanatonaphthalene.
Claim 17
Dependent Claim
24 words
A process as claimed in claim 1, wherein the quasi-hydroxyl prepolymer and the quasi-isocyanate prepolymer are contacted at a temperature between 25* and 100*C.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |