US4072636A
Expired / Lapsed
US
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Process for preparing smoke-retardant polyisocyanurate foam
Assignee: Mitsubishi Chemical Corp
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Filing: 1976-03-03
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Granted: 1978-02-07
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Expires: 1996-03-03
Abstract
Abstract In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, an improvement is characterized in that the reaction is conducted in the presence of an organosilicate having the formula Si(OR)4 or RnSi(OR')4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1-12 carbon atoms or substituted derivatives thereof and n is an integer of 1 to 3.
Inventors
- 👤 Kaneyoshi Ashida
- 👤 Masaaki Ohtani
- 👤 Shoichi Ohkubo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:09
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0014; C08J9/0042; C08G; C08G18/00; C08G18/02; C08G18/022; C08J2379/00; C08J2379/04; Y; Y10; Y10S; Y10S521/00; Y10S521/902
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
95 words
In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, an improvement characterized in that the reaction is conducted in the presence of from 0.7 to 1.5 wt. %, as Si, of an organosilicate having the formula Si(OR) 4 or R n Si(OR') 4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof and n is an integer of 1 to 3.
Claim 2
Dependent Claim
95 words
In a process for preparing a smoke-retardant polyisocyanurate foam by reacting an organic polyisocyanate in the presence of a blowing agent and an isocyanate-trimerization catalyst, an improvement characterized in that the reaction is conducted in the presence of from 0.7 to 1.5 wt. %, as Si, of an organosilicate having the formula Si(OR) 4 or R n Si(OR') 4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof and n is an integer of 1 to 3.
Claim 3
Dependent Claim
36 words
The process according to claim 1, wherein an organosilicate having the formula Si(OR) 4 is added in an amount of 0.7-1.5 wt. % as Si derived from the organosilicate relative to the weight of the foam.
Claim 4
Dependent Claim
37 words
The process according to claim 1, wherein an organosilicate having the formula R Si(OR') 3 is added in an amount of 0.7-1.5 wt. % as Si derived from the organosilicate relative to the weight of the foam.
Claim 5
Dependent Claim
29 words
The process according to claim 1, wherein an organic polyisocyanate which is produced by reacting phosgene with a condensation product of aniline and formaldehyde is used as the polyisocyanate.
Claim 6
Dependent Claim
71 words
The process according to claim 1, wherein a modified polyisocyanate which is produced by reacting a polyisocyanate with a modifier selected from the group consisting of polyether polyols, polyester polyols, polyepoxides, polyester amides, polyamines, polycarboxylic acids, liquid diene polymers having terminal hydroxyl groups, oils and fats having hydroxy groups and phenol resin prepolymers, is used as the polyisocyanate, and wherein the equivalent ratio of NCO groups to the modifier is 5-20.
Claim 7
Dependent Claim
28 words
The process according to claim 1, wherein the organosilicate is admixed with the isocyanate trimerization catalyst, and this mixture is admixed with this polyisocyanate and the blowing agent.
Claim 8
Dependent Claim
29 words
The process according to claim 1, wherein the organosilicate is admixed with the isocyanate-trimerization catalyst, the blowing agent and other additives and this mixture is admixed with the polyisocyanate.
Claim 9
Dependent Claim
33 words
The process according to claim 1, wherein the organosilicate is Si(OR) 4 or RSi (OR') 3 in which R and R' are both an aliphatic hydrocarbon groups having 2 to 5 carbon atoms.
Claim 10
Dependent Claim
70 words
A polyisocyanurate foam which contains an organosilicate having the formula Si(OR) 4 or R n Si(OR') 4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof and n is an integer of 1-3, in an amount of 0.7-1.5 wt.% as Si derived from the organosilicate relative to the weight of the foam.
Claim 11
Dependent Claim
70 words
A polyisocyanurate foam which contains an organosilicate having the formula Si(OR) 4 or R n Si(OR') 4-n wherein R and R' are the same or different and represent aliphatic, alicyclic and aromatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof and n is an integer of 1-3, in an amount of 0.7-1.5 wt.% as Si derived from the organosilicate relative to the weight of the foam.
Claim 12
Dependent Claim
27 words
The polyisocyanurate foam according to claim 9, wherein the organosilicate is Si(OR) 4 in which R is an aliphatic hydrocarbon group having 1 - 12 carbon atoms.
Claim 13
Dependent Claim
20 words
The polyisocyanurate foam according to claim 9, wherein the organosilicate is Si(OR) 4 , RSi (OR') 3 or mixtures thereof.
Claim 14
Dependent Claim
32 words
The polyisocyanurate foam according to claim 11, wherein R and R' are the same or different and both are aliphatic hydrocarbon groups having 1 - 12 carbon atoms or substituted derivatives thereof.
Claim 15
Dependent Claim
25 words
The polyisocyanurate foam according to claim 10, wherein R is an aliphatic hydrocarbon group having 2 to 5 carbon atoms or a substituted derivative thereof.
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) | 1981-02-06 | 1981-08-08 | 1982-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-06 | 1985-08-08 | 1986-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-06 | 1989-08-08 | 1990-02-07 | $7700.00 | Window Closed / Lapsed |