Patent US4189541A successfully refreshed from Google Patents.
US4189541A
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Method for producing heat resistant and flame resistant polyisocyanurate foams using little or no organosilicone surfactant
Assignee: Bridgestone Corp
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Filing: 1978-06-20
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Granted: 1980-02-19
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Expires: 1998-06-20
Abstract
Abstract Polyisocyanurate foams having excellent heat resistance and flame resistance are produced by using no common organic silicone surfactant or using less than 0.2% by weight based on an organic polyisocyanate, of said organic silicone surfactant, when producing a polyisocyanurate foam by reacting an organic polyisocyanate, a blowing agent and a catalyst for trimerizing isocyanate and if necessary a surfactant, a modifier and the other additives.
Inventors
- 👤 Takashi Ohashi
- 👤 Toru Okuyama
- 👤 Katsuhiko Arai
- 👤 Akira Suzuki
- 👤 Minoru Kojima
- 👤 Yoshiko Taniguchi
- 👤 Masako Yoshida
- 👤 Ryozo Sakata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:11
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08G; C08G18/00; C08G18/02; C08G18/022; C08G18/06; C08G18/08; C08G18/09; C08G18/092; C08J2379/00; C08J2379/04; C08J2483/00; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
83 words
In a method for producing a polyisocyanurate foam by reacting an organic polyisocyanate together with a blowing agent and a catalyst for trimerizing isocyanate, the improvement which comprises using no organosilicone surfactant or adding an organosilicone surfactant in a ratio of less than 0.2% by weight based on the organic isocyanate to form a polyisocyanurate foam having excellent heat resistance and flame resistance, wherein said organosilicone surfactant is selected from the group consisting of organosiloxanepolyoxyalkylene copolymers and polyalkenylsiloxanes having a polyoxyalkylene side chain.
Claim 2
Dependent Claim
83 words
In a method for producing a polyisocyanurate foam by reacting an organic polyisocyanate together with a blowing agent and a catalyst for trimerizing isocyanate, the improvement which comprises using no organosilicone surfactant or adding an organosilicone surfactant in a ratio of less than 0.2% by weight based on the organic isocyanate to form a polyisocyanurate foam having excellent heat resistance and flame resistance, wherein said organosilicone surfactant is selected from the group consisting of organosiloxanepolyoxyalkylene copolymers and polyalkenylsiloxanes having a polyoxyalkylene side chain.
Claim 3
Dependent Claim
15 words
The method as claimed in claim 1, wherein the organic polyisocyanate is an aromatic polyisocyanate.
Claim 4
Dependent Claim
32 words
The method as claimed in claim 2, wherein the organic polyisocyanate is mixture of polymethylene polyphenylisocyanates having the following formula ##STR3## wherein n is 0 or an integer of 1 or more.
Claim 5
Dependent Claim
20 words
The method as claimed in claim 1, wherein the blowing agent is an inactive solvent having a low boiling point.
Claim 6
Dependent Claim
13 words
The method as claimed in claim 4, wherein the blowing agent is trichloromonofluoromethane.
Claim 7
Dependent Claim
31 words
The method as claimed in claim 1, wherein the trimerizing catalyst is selected from the group consisting of a tertiary amine, a metal salt of carbonic acid or a mixture thereof.
Claim 8
Dependent Claim
27 words
The method as claimed in claim 1, wherein the trimerizing catalyst is used in an amount of 1 to 10% by weight based on the organic polyisocyanate.
Claim 9
Dependent Claim
13 words
The method as claimed in claim 1, wherein no organosilicon surfactant is used.
Claim 10
Dependent Claim
49 words
The method as claimed in claim 1, wherein the modifier is polyether polyol, polyester polyol, polyepoxide, polyesteramide, polyamine, polycarboxylic acid, liquid diene polymer having hydroxyl terminal group, fats and oils having hydroxyl group or phenol resin initial condensate selected from the group consisting of novolak and resol initial condensates.
Claim 11
Dependent Claim
16 words
The method as claimed in claim 9, wherein the modifier is polyether polyol or polyester polyol.
Claim 12
Dependent Claim
39 words
The method as claimed in claim 1, wherein an additive selected from the group consisting of inorganic hollow particles, granular refractories, fibrous substance and an inorganic filler is added to the organic polyisocyanate, blowing agent, catalyst and organosilicone surfactant.
Claim 13
Dependent Claim
19 words
The method as claimed in claim 1, wherein the surfactant(s) present, if any, consists essentially of the organosilicone surfactant.
References Cited (Backward Citations)
US4072636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-02-18 | 1983-08-20 | 1984-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-02-18 | 1987-08-20 | 1988-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-02-18 | 1991-08-20 | 1992-02-19 | $7700.00 | Window Closed / Lapsed |