US4324716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solutions of polyisocyanate polyaddition products
Assignee: Bayer AG
•
Filing: 1980-11-24
•
Granted: 1982-04-13
•
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 04:18
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.
References Cited (Backward Citations)
US2917471A
Cited
US3373143A
Cited
US3503934A
Cited
DE1168075B
Cited
DE1260142B
Cited
US3300417A
Cited
US3264134A
Cited
US3983087A
Cited
US4014809A
Cited
DE2513815C3
Cited
DE2550797A1
Cited
US4093569A
Cited
US4184990A
Cited
DE2550796B2
Cited
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 |