EP0000029B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for the preparation of aqueous dispersions or solutions of polyurethanes, their use as coatings forf lexible substrates
Assignee: Bayer AG
•
Filing: 1978-06-01
•
Granted: 1980-07-23
•
Expires: 1998-06-01
Abstract
No abstract record available.
Inventors
- 👤 Josef Dr. Pedain
- 👤 Klaus Dr. Nachtkamp
- 👤 Klaus Dr. Noll
- 👤 Jürgen Dr. Grammel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-02 23:49
CPC Classifications
C; C08; C08G; C08G18/00; C08G18/06; C08G18/08; C08G18/0804; C03; C03C; C03C25/00; C08G18/10; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31551
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
Process for the preparation of aqueous solutions or dispersions of polyurethane poly- ureas by the reaction of prepolymers which have at least two free isocyanate groups and contain chemically fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed, with organic compounds containing at least two primary and/or secondary amino groups, in the aqueous phase, characterised in that the prepolymer containing isocyanate groups, which prepolymer is hydro- philically modified and/or contains an external emulsifier, is mixed, in the absence of water, with compounds which have at the most one free primary or secondary amino group and at least one blocked group from which a free primary or secondary amino group is formed by the action of water, and a total of at least two at least partially blocked primary and/or secondary amino groups, and the mixture obtained is subsequently admixed with water.
Claim 2
Dependent Claim
143 words
Process for the preparation of aqueous solutions or dispersions of polyurethane poly- ureas by the reaction of prepolymers which have at least two free isocyanate groups and contain chemically fixed hydrophilic groups and/or external emulsifiers which are not chemically fixed, with organic compounds containing at least two primary and/or secondary amino groups, in the aqueous phase, characterised in that the prepolymer containing isocyanate groups, which prepolymer is hydro- philically modified and/or contains an external emulsifier, is mixed, in the absence of water, with compounds which have at the most one free primary or secondary amino group and at least one blocked group from which a free primary or secondary amino group is formed by the action of water, and a total of at least two at least partially blocked primary and/or secondary amino groups, and the mixture obtained is subsequently admixed with water.
Claim 3
Dependent Claim
47 words
Process according to claim 1, characterised in that the nature and proportions of the reactants are chosen so that from 0.25 to 1.5 at least partially blocked amino groups which are reactive with isocyanate groups are present for each isocyanate group of the prepolymer containing isocyanate groups.
Claim 4
Dependent Claim
18 words
The use of the dispersions or solutions obtained according to claims 1 and 2 for coating flexible substrates.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.