US4177205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of highly stable liquid carbodiimide-containing polyisocyanate compositions
Assignee: BASF Corp
•
Filing: 1978-11-20
•
Granted: 1979-12-04
•
Expires: 1998-11-20
Abstract
Abstract Highly stable liquid 4,4'-diphenylmethane diisocyanate (MDI) containing MDI-carbodiimide adducts are prepared by (a) heating MDI at a temperature of from 60 DEG C. to 120 DEG C. for a period of from one hour to ten hours in the presence of tris(chloromethyl)phosphine oxide, (b) stopping the carbodiimide formation by adding thereto a quenchant selected from the group consisting of magnesium chloride hydrate, stannous chloride and trichlorosilane, (c) heating the reaction mixture at a temperature between 60 DEG C. and 120 DEG C. for a period of from 0.5 hour to 6.0 hours, and (d) cooling to room temperature. The resulting compositions are highly stable and may be advantageously employed in the preparation of polyurethane compositions.
Inventors
- 👤 Robert L. Schaaf
- 👤 Peter T. Kan
- 👤 Moses Cenker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:14
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C07; C07C; C07C263/00; C07C263/18; C08G18/08; C08G18/10; C08G18/28; C08G18/30; C08G18/32; C08G18/3203; C08G18/3206; C08G18/40; C08G18/48; C08G18/4833; C08G18/4837; C08G18/4841; C08G18/65; C08G18/66; C08G18/6666; C08G18/667; C08G18/6674; C08G2110/00; C08G2110/0041; C08G2110/0066; Y; Y10; Y10S; Y10S521/00; Y10S521/901
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
121 words
A process for the preparation of highly stable liquid carbodiimide-containing 4,4'-diphenylmethane diisocyanate having an isocyanate content of from 20 to 32 percent by weight comprising (a) heating 4,4'-diphenylmethane diisocyanate or mixtures containing same at a temperature of from 60° C. to 120° C. for a period of from one hour to ten hours in the presence of tris(chloromethyl)phosphine oxide, (b) stopping the carbodiimide formation by adding to the reaction mixture a quenchant selected from the group consisting of magnesium chloride hydrate, stannous chloride and trichlorosilane, (c) maintaining the reaction mixture at a temperature of from 60° C. to 120° C. for a period of from 0 hour to six hours and (d) cooling the product resulting from (c) to room temperature.
Claim 2
Dependent Claim
121 words
A process for the preparation of highly stable liquid carbodiimide-containing 4,4'-diphenylmethane diisocyanate having an isocyanate content of from 20 to 32 percent by weight comprising (a) heating 4,4'-diphenylmethane diisocyanate or mixtures containing same at a temperature of from 60° C. to 120° C. for a period of from one hour to ten hours in the presence of tris(chloromethyl)phosphine oxide, (b) stopping the carbodiimide formation by adding to the reaction mixture a quenchant selected from the group consisting of magnesium chloride hydrate, stannous chloride and trichlorosilane, (c) maintaining the reaction mixture at a temperature of from 60° C. to 120° C. for a period of from 0 hour to six hours and (d) cooling the product resulting from (c) to room temperature.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the quenchant is stannous chloride.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein the quenchant is magnesium chloride hydrate.
Claim 5
Dependent Claim
28 words
The process of claim 1 wherein (a) is conducted at a temperature of from 80° C. to 100° C. for a period of from two to six hours.
Claim 6
Dependent Claim
23 words
The process of claim 1 wherein the quenchant is employed in a mole ratio of quenchant to catalyst of from 1:1 to 3:1.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein (a) is carried out in the presence of a polyol.
Claim 8
Dependent Claim
13 words
A highly stable liquid composition prepared in accordance with claim 1 or 6.
References Cited (Backward Citations)
US3761502A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-03 | 1983-06-04 | 1983-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-03 | 1987-06-04 | 1987-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-03 | 1991-06-04 | 1991-12-04 | $7700.00 | Window Closed / Lapsed |