Patent US4336341A successfully refreshed from Google Patents.
US4336341A
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US
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Production of polyisocyanurate foam
Assignee: DKS Co Ltd
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Filing: 1980-11-26
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Granted: 1982-06-22
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Expires: 2000-11-26
Abstract
Abstract Polyisocyanurate foam is produced by reacting a polyisocyanate component with an anhydrous reaction product between a dibasic acid anhydride and a partially alcoholated polyether-polyol with an alkali metal hydroxide and/or alkaline earth metal hydroxide. The reaction product acts as a catalyst for trimerizing the polyisocyanate and also as a polyether-polyol component.
Inventors
- 👤 Tsuyoshi Fujiwara
- 👤 Osamu Sugimoto
- 👤 Chuzo Isoda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:25
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4244; C08G18/08; C08G18/0804; C08G18/0819; C08G18/16; C08G18/22; C08G18/225; C08G18/4247; C08G18/48; C08G18/4887; C08G18/50; C08G63/00; C08G63/66; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/331; C08G65/332; C08G2110/00; C08G2110/0025; C08G2115/00; C08G2115/02; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
73 words
In a method for producing polyisocyanurate foam comprising reacting a polysiocyanate component with a polyether-polyol component in the presence of a foaming agent and a catalyst for trimerizing said polyisocyanate, the improvement comrising employing the anhydrous reaction product between a dibasic carboxylic acid anhydride and a partially alcoholated polyether-polyol with an alkali metal hydroxide and/or an alkaline earth metal hydroxide as the polyether-polyol component, whereby said component simultaneously acts as a trimerization catalyst.
Claim 2
Dependent Claim
73 words
In a method for producing polyisocyanurate foam comprising reacting a polysiocyanate component with a polyether-polyol component in the presence of a foaming agent and a catalyst for trimerizing said polyisocyanate, the improvement comrising employing the anhydrous reaction product between a dibasic carboxylic acid anhydride and a partially alcoholated polyether-polyol with an alkali metal hydroxide and/or an alkaline earth metal hydroxide as the polyether-polyol component, whereby said component simultaneously acts as a trimerization catalyst.
Claim 3
Dependent Claim
25 words
The method according to claim 1, wherein said dibasic acid is selected from the group consisting of succinic, glutaric, fumaric, maleic, phthalic and cyclohexanedicarboxylic acids.
Claim 4
Dependent Claim
21 words
The method according to claim 1, wherein said metal is selected from the group consisting of sodium, potassium, calcium and magnesium.
Claim 5
Dependent Claim
27 words
The method according to claim 1, wherein said partially alcoholated polyether-polyol comprises 0.05 to 10 parts by weight of said metal per 100 parts by weight thereof.
Claim 6
Dependent Claim
26 words
The method according to claim 1, wherein said reaction product comprises 0.5 to 1.5 equivalents of said dibasic acid anhydride per one equivalent of said metal.
Claim 7
Dependent Claim
20 words
The method according to claim 1, wherein the equivalent ratio of said polyisocyanate to said polyether-polyol is greater than 2.
Claim 8
Dependent Claim
41 words
The method according to claim 1, wherein said polyether-polyol is prepared by reacting an initiator compound having at least two active hydrogen atoms with an alkylene oxide in the presence of an alkali metal hydroxide and/or an alkaline earth metal hydroxide.
Claim 9
Dependent Claim
32 words
The method according to claim 7, wherein said initiator compound is selected from the group consisting of low molecular weight aliphatic polyhydric alcohols, alkanolamines, aliphatic polyamines, aromatic polyamines and aromatic polyhydric alcohols.
Claim 10
Dependent Claim
26 words
The method according to claim 7, wherein said alkylene oxide is selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, and mixtures thereof.
Claim 11
Dependent Claim
18 words
The method according to claim 7, wherein said polyether-polyol initially has a hydroxyl number from 25 to 1000.
References Cited (Backward Citations)
US3455886A
Cited
US4128532A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-21 | 1985-12-21 | 1986-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-21 | 1989-12-21 | 1990-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-21 | 1993-12-21 | 1994-06-22 | $7700.00 | Window Closed / Lapsed |