US3928258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of low friability rigid polyurethane foam
Assignee: Olin Corp
•
Filing: 1974-09-23
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Granted: 1975-12-23
•
Expires: 1994-09-23
Abstract
Abstract An improvement is disclosed in the preparation of rigid polyurethane foams which have relatively high surface friability. The improvement resides in the use of a select group of supplemental polyether polyols having 2-3 hydroxy groups in order to reduce the friability of the resulting foam.
Inventors
- 👤 Roy P Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/50; C08G18/5003; C08G18/5006; C08G18/5009; C08G18/4804; Y; Y10; Y10S; Y10S521/00; Y10S521/914
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
129 words
IN A PROCESS OF RIGID POLYURETHANE FOAM FROM A REACTION MIXTURE COMPRISED OF A POLYETHER POLYOL REACTANT, AN ORGANIC POLYISOCYANATE REACTANT, A REACTION CATALYST AND A FOAMING AGENT, SAID POLYETHER POLYOL REACTION CATALYST AND A DROXYL NUMBER OF ABOUT 150-800 AND BEING THE PRODUCT OF CONDENSING 4,4,4-TRICHLORO-1,2-EPOXYBUTANE WITH A MIXTURE SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF DEXTROSE AND WATER, A MIXTURE OF DEXTROSE AND AN ALIPHATIC DIOL OR TRIOL, AND A MIXTURE OF DEXTROSE, WATER AN AN ALIPHATIC DIOL OR TIOL, THE IMPROVEMENT OF INCLUDING IN SAID REACTION MIXTURE A SECOND POLYETHER POLYOL HAVING 2-3 HYDROXY GROUPS AND A MOLECULAR WEIGHT FROM ABOUT 1,000 TO ABOUT 6,000, SAID SECOND POLYETHER POLYOL BEING EMPLOYED IN A PROPORTION WHICH IS EFFECTIVE IN REDUCING THE FRIABILITY OF SAID FOAM.
Claim 2
Dependent Claim
129 words
IN A PROCESS OF RIGID POLYURETHANE FOAM FROM A REACTION MIXTURE COMPRISED OF A POLYETHER POLYOL REACTANT, AN ORGANIC POLYISOCYANATE REACTANT, A REACTION CATALYST AND A FOAMING AGENT, SAID POLYETHER POLYOL REACTION CATALYST AND A DROXYL NUMBER OF ABOUT 150-800 AND BEING THE PRODUCT OF CONDENSING 4,4,4-TRICHLORO-1,2-EPOXYBUTANE WITH A MIXTURE SELECTED FROM THE GROUP CONSISTING OF A MIXTURE OF DEXTROSE AND WATER, A MIXTURE OF DEXTROSE AND AN ALIPHATIC DIOL OR TRIOL, AND A MIXTURE OF DEXTROSE, WATER AN AN ALIPHATIC DIOL OR TIOL, THE IMPROVEMENT OF INCLUDING IN SAID REACTION MIXTURE A SECOND POLYETHER POLYOL HAVING 2-3 HYDROXY GROUPS AND A MOLECULAR WEIGHT FROM ABOUT 1,000 TO ABOUT 6,000, SAID SECOND POLYETHER POLYOL BEING EMPLOYED IN A PROPORTION WHICH IS EFFECTIVE IN REDUCING THE FRIABILITY OF SAID FOAM.
Claim 3
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 1.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein said second polyether polyol is an oxypropylated or oxypropylated than oxyethylated diol or triol.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein said second polyether polyol has a molecular weight of about 1,200-4,500.
Claim 6
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 4.
Claim 7
Dependent Claim
36 words
The process of claim 4 wherein said polyether polyol reactant is the product of condensing, in the presence of a Lewis acid catalyst, 4,4,4-trichloro-1,2-epoxybutane with a mixture of dextrose and an aliphatic diol or triol alcohol.
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein said polyether polyol reactant has a hydroxyl number of about 260-550.
Claim 9
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 7.
Claim 10
Dependent Claim
28 words
The process of claim 7 wherein said second polyether polyol has a molecular weight of about 2,000-4,000 and is an oxypropylated triol or an oxypropylated then oxyethylated triol.
Claim 11
Dependent Claim
30 words
The process of claim 9 wherein said second polyether polyol is employed in a proportion of about 8-30 parts per every 100 parts by weight of said polyether polyol reactant.
Claim 12
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 10.
Claim 13
Dependent Claim
18 words
The process of claim 10 wherein said Lewis acid catalyst is boron trifluoride or an etherate derivative thereof.
Claim 14
Dependent Claim
25 words
The process of claim 12 wherein the mixture used in preparing said polyether polyol reactant is a mixture of Alpha -d-glucose monohydrate and ethylene glycol.
Claim 15
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 13.
Claim 16
Dependent Claim
13 words
The process of claim 13 wherein said reaction mixture comprises a silicon-based surfactant.
Claim 17
Dependent Claim
29 words
The process of claim 15 wherein said foaming agent is a halogenated hydrocarbon foaming agent and said organic polyisocyanate is toluene diisocyanate, polymethylene polyphenyl isocyanate, or a mixture thereof.
Claim 18
Dependent Claim
10 words
A polyurethane foam prepared by the process of claim 16.
References Cited (Backward Citations)
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US3369014A
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US3419532A
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US3847844A
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US3728288A
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |