US3723394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polyurethane prepolymers comprising terminal isocyanate groups
Assignee: Naphtachimie SA
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Filing: 1971-05-28
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Granted: 1973-03-27
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Expires: 1991-05-28
Abstract
Abstract Preparation of polyurethane prepolymers having terminal isocyanate groups comprising reacting an organic polyisocyanate with a polyhydroxylated compound having less than 0.1 percent by weight of water in the presence of a hydrolyzable metal halide at a temperature within the range of 50* to 100* C.
Inventors
- 👤 A Gibier-Rambaud
- 👤 B Blanc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:04
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/089; C08G18/088; C08G18/0885; C08G18/10; Y; Y10; Y10S; Y10S528/00; Y10S528/905
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
The process as claimed in claim 1 in which the reaction is carried out at an elevated temperature with the range of 50*-100*C.
Claim 2
Dependent Claim
15 words
The process as claimed in claim 1 in which the titanium halide is titanium tetra-chloride.
Claim 3
Dependent Claim
42 words
The process as claimed in claim 1 in which the polyhydroxylated compound is a polyol of a polyether-polyol obtained by the reaction of a polyol with an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide and mixtures thereof.
Claim 4
Dependent Claim
24 words
The process as claimed in claim 4 in which the polyol is selected from the group consisting of alkyleneglycols, glycerol, trimethylolpropane, pentaerythritol and sorbitol.
Claim 5
Dependent Claim
15 words
As new industrial products, the polyurethane prepolymers produced by the process according to claim 1.
Claim 6
Dependent Claim
30 words
Cross-linked polyurethanes produced by the reaction of the prepolymers of claim 6 with compounds having, per molecule, at least two hydrogen atoms which are active with respect to the isocyanates.
Claim 7
Dependent Claim
32 words
The processes claimed in claim 3 in which the ratio by weight between the amount of titanium halide to the amount of water contained in the polyhydroxylated compound is more than 0.8.
References Cited (Backward Citations)
DE1170627B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |