Patent US4324716A successfully refreshed from Google Patents.
US4324716A
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Solutions of polyisocyanate polyaddition products
Assignee: Bayer AG
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Filing: 1980-11-24
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Granted: 1982-04-13
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Expires: 2000-11-24
Abstract
Abstract This invention relates to solutions of polyisocyanate polyaddition products with a solids content of from 5 to 70% by weight of A. Reaction products of (a) polyisocyanates, (b) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and/or urea and/or low molecular weight polyols, (c) optionally higher molecular weight polyols and (d) optionally formaldehyde in B. polyhydric alcohols having a molecular weight of between 62 and 450.
Inventors
- 👤 Artur Reischl
- 👤 Gert Jabs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:48
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/32; C08G18/3225; C08G18/08; C08G18/0804; C08G18/0838; C08G18/0842; C08G18/0847; C08G18/0852; C08G18/0857; C08L; C08L75/00; C08L75/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
A process for the preparation of clear, transparent, uniform and homogeneous polyhydric alcohol solutions of polyisocyanate polyaddition products with a solids content of 5 to 70% by weight in 30 to 95% by weight polyhydric alcohol solvent having a molecular weight between 62 and 200 comprising reacting: (A) polyisocyanates or isocyanate containing prepolymers of polyisocyanates and higher molecular weight and/or low molecular weight polyhydroxyl compounds in situ with (B) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and optionally formaldehyde in (C) polyhydric alcohols having a molecular weight of between 62 and 200, optionally in the presence of water, and the water, if used, being subsequently removed in known manner.
Claim 2
Dependent Claim
109 words
A process for the preparation of clear, transparent, uniform and homogeneous polyhydric alcohol solutions of polyisocyanate polyaddition products with a solids content of 5 to 70% by weight in 30 to 95% by weight polyhydric alcohol solvent having a molecular weight between 62 and 200 comprising reacting: (A) polyisocyanates or isocyanate containing prepolymers of polyisocyanates and higher molecular weight and/or low molecular weight polyhydroxyl compounds in situ with (B) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and optionally formaldehyde in (C) polyhydric alcohols having a molecular weight of between 62 and 200, optionally in the presence of water, and the water, if used, being subsequently removed in known manner.
Claim 3
Dependent Claim
26 words
A process according to claim 1 wherein isocyanate containing compounds (A) and aminofunctional compounds (B) are reacted in an equivalent ratio of from 0.50:1 to 1.50:1.
Claim 4
Dependent Claim
23 words
The process of claim 1, wherein said polyhydric alcohols are selected from the group consisting of ethylene glycol, diethylene glycol, propanediol and butanediol.
Claim 5
Dependent Claim
108 words
Clear, transparent, uniform and homogeneous polyhydric alcohol solutions of polyisocyanate polyaddition products with a solids content of from 5 to 70% by weight in 30 to 95% by weight polyhydric alcohol solvent having a molecular weight between 62 and 200, produced by the process comprising reacting: (A) polyisocyanates or isocyanate containing prepolymers of polyisocyanates and higher molecular weight and/or low molecular weight polyhydroxyl compounds in situ with (B) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and optionally formaldehyde in (C) polyhydric alcohols having a molecular weight of between 62 and 200, optionally in the presence of water, and the water, if used, being subsequently removed in known manner.
Claim 6
Dependent Claim
108 words
Clear, transparent, uniform and homogeneous polyhydric alcohol solutions of polyisocyanate polyaddition products with a solids content of from 5 to 70% by weight in 30 to 95% by weight polyhydric alcohol solvent having a molecular weight between 62 and 200, produced by the process comprising reacting: (A) polyisocyanates or isocyanate containing prepolymers of polyisocyanates and higher molecular weight and/or low molecular weight polyhydroxyl compounds in situ with (B) hydrazines and/or polyamines and/or dihydrazides and/or ammonia and optionally formaldehyde in (C) polyhydric alcohols having a molecular weight of between 62 and 200, optionally in the presence of water, and the water, if used, being subsequently removed in known manner.
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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) | 1985-04-12 | 1985-10-12 | 1986-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-12 | 1989-10-12 | 1990-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-12 | 1993-10-12 | 1994-04-13 | $7700.00 | Window Closed / Lapsed |