US4639502A
Expired / Lapsed
US
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Substantially colorless organic polyisocyanates, processes for their production and their use in the production of polyurethane plastics
Assignee: Bayer AG
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Filing: 1985-05-03
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Granted: 1987-01-27
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Expires: 2005-05-03
Abstract
Abstract The present invention relates to substantially colorless organic polyisocyanates, optionally in solution in an inert solvent, having a Hazen color index according to DIN 53 409 of at most 60 and a yellow value according to DIN 6167 of at most 3.0, characterized by a content of about 0.01 to 1 ppm (by weight), based on polyisocyanate, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or a mixture of such dyes. The present invention also relates to two processes for preparing the substantially colorless organic polyisocyanates. In the first process, the organic dye is added to the prepared polyisocyanate while in the second process the organic dye is added to the starting materials used to prepare the polyisocyanate. Finally, the present invention is directed to the production of polyisocyanate polyaddition products from the substantially colorless organic polyisocyanates and isocyanate-reactive compounds.
Inventors
- 👤 Hanns P. Muller
- 👤 Werner Clarenz
- 👤 Ulrich VON Gizycki
- 👤 Kuno Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:59
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/791; C08G18/792; C08G18/7806; C08G18/7818; C08G18/7831; C08K; C08K5/00; C08K5/0008; C08K5/0041
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
76 words
A substantially colorless organic polyisocyanate, optionally in solution in an inert solvent, having a Hazen color index according to DIN 53 409 of at most 60 and a yellow value according to DIN 6167 of at most 3.0, which contains about 0.01 to 1 ppm (by weight), based on polyisocyanate, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or of a mixture of said dyes.
Claim 2
Dependent Claim
76 words
A substantially colorless organic polyisocyanate, optionally in solution in an inert solvent, having a Hazen color index according to DIN 53 409 of at most 60 and a yellow value according to DIN 6167 of at most 3.0, which contains about 0.01 to 1 ppm (by weight), based on polyisocyanate, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or of a mixture of said dyes.
Claim 3
Dependent Claim
48 words
The substantially colorless organic polyisocyanate of claim 1 wherein the polyisocyanate is a lacquer-grade polyisocyanate selected from the group consisting of biuret polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane and isocyanurate polyisocyanates based on mixtures of 1,6-diisocyanatohexane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane.
Claim 4
Dependent Claim
55 words
A process for producing a substantially colorless organic polyisocyanate which comprises mixing a polyisocyanate, optionally dissolved in an inert solvent, with about 0.01 to 1 ppm, based on polyisocyanate, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or of a mixture of said dyes.
Claim 5
Dependent Claim
55 words
A process for producing a substantially colorless organic polyisocyanate which comprises mixing a polyisocyanate, optionally dissolved in an inert solvent, with about 0.01 to 1 ppm, based on polyisocyanate, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or of a mixture of said dyes.
Claim 6
Dependent Claim
48 words
The process of claim 3 wherein said substantially colorless organic polyisocyanate is a lacquer-grade polyisocyanate selected from the group consisting of biuret polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1,6-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane and isocyanurate polyisocyanates based on mixtures of 1,6-diisocyanatohexane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane.
Claim 7
Dependent Claim
98 words
A process for producing a substantially colorless, lacquer-grade polyisocyanate selected from the group consisting of biuret polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane and isocyanurate polyisocyanates based on mixtures of 1,6-diisocyanatohexane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane which comprises biuretizing or trimerizing the corresponding diisocyanate in the presence of about 0.01 to 1 ppm, based on the weight of the lacquer-grade polyisocyanate obtained by the biuretization or trimerization, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or a mixture of said dyes.
Claim 8
Dependent Claim
98 words
A process for producing a substantially colorless, lacquer-grade polyisocyanate selected from the group consisting of biuret polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1,6-diisocyanatohexane, isocyanurate polyisocyanates based on 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane and isocyanurate polyisocyanates based on mixtures of 1,6-diisocyanatohexane and 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethyl cyclohexane which comprises biuretizing or trimerizing the corresponding diisocyanate in the presence of about 0.01 to 1 ppm, based on the weight of the lacquer-grade polyisocyanate obtained by the biuretization or trimerization, of an organic dye soluble in the polyisocyanate and having an absorption maximum of about 560 to 590 nm or a mixture of said dyes.
Claim 9
Dependent Claim
23 words
A process for the production of polyisocyanate polyaddition products which comprises reacting (a) the polyisocyanate of claim 1 with (b) an isocyanate-reactive compound.
Claim 10
Dependent Claim
21 words
The process of claim 6 wherein said polyisocyanate polyaddition product is a polyurethane plastic and said isocyanate-reactive compound contains hydroxyl groups.
Claim 11
Dependent Claim
17 words
The process of claim 6 wherein said polyisocyanate is blocked with a blocking agent for isocyanate groups.
Claim 12
Dependent Claim
17 words
The process of claim 7 wherein said polyisocyanate is blocked with a blocking agent for isocyanate groups.
Claim 13
Dependent Claim
37 words
The substantially colorless organic polyisocyanate of claim 1 wherein an inert solvent containing ether groups is present and, in addition, about 10 to about 1000 ppm, based on the total composition, of an antioxidant is also present.
Claim 14
Dependent Claim
37 words
The substantially colorless organic polyisocyanate of claim 2 wherein an inert solvent containing ether groups is present and, in addition, about 10 to about 1000 ppm, based on the total composition, of an antioxidant is also present.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-01-26 | 1990-07-28 | 1991-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-26 | 1994-07-28 | 1995-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-26 | 1998-07-28 | 1999-01-27 | $7700.00 | Window Closed / Lapsed |