Process for the preparation of aqueous dispersions or solutions of polyurethanes and the use thereof
CA 1102027 A · Owner: Bayer Aktiengesellschaft · Inventors: Dieterich, Dieter; Wenzel, Wolfgang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a process for the preparation of aqueous dispersions or solutions of polyurethanes which have urea end groups and contain non-ionic hydrophilic segments and which are capable of being cross-linked with the aid of cross-linking agents which are reactive with urea groups, characterized in that prepolymers which have isocyanate end groups and which (i) have an average molecular weight of less than about 15,000 and, (ii) contain from about 2 to 30% by weight, of, ethylene oxide units corresponding to the following formula:, -CH2-CH2-O-, within a polyether chain (containing ethylene oxide units), are reacted at from about 10 to 70°C with an aqueous solution of …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 26, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 26, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.