US3936483A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organic polyisocyanates
Assignee: Bayer Corp
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Filing: 1970-07-28
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Granted: 1976-02-03
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Expires: 1990-07-28
Abstract
Abstract A polyisocyanate composition comprising a mixture of from about 10 percent to about 90 percent by weight of toluene diisocyanate and the balance a mixture of polyphenyl-polymethylene-polyisocyanates which latter are preferably the refined condensation product of aniline and formaldehyde. These polyisocyanate compositions are eminently suitable as isocyanate precursors for the production of high rise, thin section cellular polyurethane moldings.
Inventors
- 👤 Paul G. Gemeinhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:49
CPC Classifications
C; C07; C07C; C07C265/00; C07C265/14; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/74; C08G18/76; C08G18/7607
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
77 words
A composition comprising a mixture of from about 10 per cent to about 90 per cent by weight of toluylene diisocyanate selected from the group consisting of 2,4-toluylene diisocyanate, 2,6-toluylene diisocyanate and mixtures thereof and the balance a polyphenylpolymethylene-polyisocyanate comprising a mixture of from about 40 per cent to about 60 per cent diphenylmethane diisocyanate, from about 20 per cent to about 30 per cent of triisocyanate having the formula ##SPC5## and the balance higher functional polyphenyl-poltmethylene-polyisocyanates.
Claim 2
Dependent Claim
77 words
A composition comprising a mixture of from about 10 per cent to about 90 per cent by weight of toluylene diisocyanate selected from the group consisting of 2,4-toluylene diisocyanate, 2,6-toluylene diisocyanate and mixtures thereof and the balance a polyphenylpolymethylene-polyisocyanate comprising a mixture of from about 40 per cent to about 60 per cent diphenylmethane diisocyanate, from about 20 per cent to about 30 per cent of triisocyanate having the formula ##SPC5## and the balance higher functional polyphenyl-poltmethylene-polyisocyanates.
Claim 3
Dependent Claim
27 words
The composition of claim 1 wherein the toluylene diisocyanate is an isomeric mixture of about 80 per cent 2,4-toluylene diisocyanate and about 20 per cent 2,6-toluylene diisocyanate.
Claim 4
Dependent Claim
50 words
The composition of claim 2 wherein the toluylene diisocyanate component is present in an amount of from about 50 per cent to about 35 per cent by weight and the polyphenyl-polymethylene-polyisocyanate component is present in an amount of from about 50 per cent to about 65 per cent by weight.
Claim 5
Dependent Claim
38 words
The composition of claim 2 wherein the toluylene diisocyanate component is present in an amount of about 50 per cent by weight component the polyphenyl-polymethylene-polyisocyanate compound is present in an amount of about 50 per cent by weight.
Claim 6
Dependent Claim
74 words
The composition of claim 1 wherein the polyphenyl-polymethylene-polyisocyanates are represented by the formula ##SPC6## wherein n has an average value of 1.1 and the mixture contains about 45 per cent diphenylmethane diisocyanate, about 20 per cent triisocyanate, about 15 per cent tetraisocyanate and about 20 per cent penta- or higher functional polyisocyanates, the mixture having a viscosity of about 200 cp/25°C., a pour point of about 0°F. and about 31.5 per cent free --NCO.
Claim 7
Dependent Claim
39 words
The composition of claim 1 wherein the higher functional polyphenyl-polymethylene-polyisocyanate comprises from about 8 per cent to about 17 per cent tetraphenylene trimethylene tetraisocyanate and from about 5 per cent to about 30 per cent higher frunction homologous polyphenyl-polymethylene-polyisocyanates.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |