US4405725A
Expired / Lapsed
US
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Foamed polyisocyanurates
Assignee: Bayer Corp
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Filing: 1977-07-20
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Granted: 1983-09-20
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Expires: 1997-07-20
Abstract
Abstract Foams having improved flammability characteristics are prepared by reacting a polyaryl polyalkylene polyisocyanate with 2 to 15 parts of an active hydrogen compound having a molecular weight of from about 350 to about 10,000 and from one to six active hydrogen containing groups as determined by the Zerewitinoff method in the presence of a blowing agent, a stabilizer and a catalyst.
Inventors
- 👤 David L. Bernard
- 👤 John K. Backus
- 👤 Anthony J. Doheny, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/08; C08G18/09; C08G18/092; C08G18/16; C08G18/18; C08G18/1825; C08G18/28; C08G18/40; C08G18/64; C08G18/6492; C08G18/74; C08G18/76; C08G18/7657; C08G18/7664; C08G2110/00; C08G2110/0025
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
A foamed polymer prepared by a process which comprises reacting a mixture of polyaryl alkylene polyisocyanates having the formula: ##STR13## wherein R is an organic radical obtained by removing the carbonyl oxygen from an aldehyde or ketone, m is 1 or 2, X is halogen, lower alkyl or hydrogen and n is 0.1 to 1.5 with from about 2 to about 15 parts by weight of an organic compound per 100 parts of the polyisocyanate mixture, the organic compound containing from 2 to 4 hydroxyl groups as determined by the Zerewitinoff method and having a molecular weight of 350 to 10,000, in the presence of a foam stabilizer, a blowing agent and a catalyst which will trimerize isocyanate groups.
Claim 2
Dependent Claim
119 words
A foamed polymer prepared by a process which comprises reacting a mixture of polyaryl alkylene polyisocyanates having the formula: ##STR13## wherein R is an organic radical obtained by removing the carbonyl oxygen from an aldehyde or ketone, m is 1 or 2, X is halogen, lower alkyl or hydrogen and n is 0.1 to 1.5 with from about 2 to about 15 parts by weight of an organic compound per 100 parts of the polyisocyanate mixture, the organic compound containing from 2 to 4 hydroxyl groups as determined by the Zerewitinoff method and having a molecular weight of 350 to 10,000, in the presence of a foam stabilizer, a blowing agent and a catalyst which will trimerize isocyanate groups.
Claim 3
Dependent Claim
25 words
The foamed polymer of claim 1 wherein the organic compound has from 2 to 4 hydroxyl groups and a molecular weight of 350 to 5000.
Claim 4
Dependent Claim
79 words
The foamed polymer of claim 1 wherein R is CH 2 , m is 1, X is hydrogen, n is 0.1 to 1.5, said active hydrogen compound is a polyol having 3 to 4 hydroxyl groups and a molecular weight of 350 to 5000, said blowing agent is a halohydrocarbon, said catalyst is one that will cause gelation of an isocyanate in 10 minutes at 20° C. and said foam stabilizer is a polyoxyalkylene block copolymer of a silane.
Claim 5
Dependent Claim
11 words
The foamed polymer of claim 3 wherein said catalyst is 4,4,6-tris(dimethylaminomethyl)phenol.
Claim 6
Dependent Claim
23 words
The foamed polymer of claim 3 wherein the mixture of isocyanates has the formula ##STR14## wherein n has an average value of 0.7.
Claim 7
Dependent Claim
124 words
A highly flame resistant foam containing isocyanurate groups prepared by reacting in the presence of (a) blowing agent and (b) a catalyst which will trimerize isocyanates, (c) an alcohol having 2 to 4 hydroxyl groups and a molecular weight of 350 to 10,000 with (d) a mixtuure of polyaryl alkylene polyisocyanates having the formula: ##STR15## wherein R is an organic radical obtained by removing the carbonyl oxygen from formaldehyde or ketone; m is 1 or 2; X is selected from halogen, lower alkyl, or hydrogen; and n has an average value of from 0.1 to 1.5, with the proviso that the amount of alcohol (C) used is from 2 to 15 parts by weight per 100 parts by weight of polyaryl alkylene polyisocyanates (D).
Claim 8
Dependent Claim
124 words
A highly flame resistant foam containing isocyanurate groups prepared by reacting in the presence of (a) blowing agent and (b) a catalyst which will trimerize isocyanates, (c) an alcohol having 2 to 4 hydroxyl groups and a molecular weight of 350 to 10,000 with (d) a mixtuure of polyaryl alkylene polyisocyanates having the formula: ##STR15## wherein R is an organic radical obtained by removing the carbonyl oxygen from formaldehyde or ketone; m is 1 or 2; X is selected from halogen, lower alkyl, or hydrogen; and n has an average value of from 0.1 to 1.5, with the proviso that the amount of alcohol (C) used is from 2 to 15 parts by weight per 100 parts by weight of polyaryl alkylene polyisocyanates (D).
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) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |