Stable polyurethane latices, emulsifiable prepolymers therefor and methods of making the same
US4110286A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 7, 1977 |
| Grant date | Aug 29, 1978 |
| Priority date | — |
| Expiry date | Feb 7, 1997 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/10
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Novel emulsifiable prepolymers for polyurethanes comprising an isocyanate prepolymer a minor proportion of the terminal isocyanate groups of which have been reacted with a quaternized tertiary amino alcohol, storage stable polyurethane latices produced therefrom and methods of making them are described. In a preferred embodiment a conventional isocyanate terminated prepolymer is first produced by the reaction of a polyol, preferably a diol of polyether or polyester origin, with a stoichiometric excess of a polyisocyanate, preferably a diisocyanate such as toluene diisocyanate; this prepolymer is then reacted, under anhydrous conditions, with a small amount, usually from about 1% to 5%, preferably about 1% to about 2%, by weight of a quaternized tertiary amino alcohol. Alternatively, a small amount of the quaternized tertiary amino alcohol may be included in the mixture of polyol and excess isocyanate used for making the prepolymer. In both cases there is obtained a prepolymer a minor proportion of the terminal isocyanate groups of which have been reacted through an urethane (carbamic ester) linkage with the quaternized tertiary amino alcohol. The thus obtained prepolymer is readily…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.