Aqueous polyurethane emulsions
US4070323A · kind A · utility
Inventors
Key dates
| Filing date | Mar 26, 1976 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Mar 26, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31605
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method comprising PA0 I. reacting isocyanate groups in an organic polyisocyanate by anhydrous reaction with a chemically equivalent amount of primary hydroxyl-containing material, at least about 50 mole % of which material is one or a mixture of PA1 A. allyl alcohol, or PA1 B. at least one C.sub.2-4 hydroxyalkyl ester of acrylic or methacrylic acid, to form a water-resistant adduct of said polyisocyanate with said material, and PA0 Ii. intimately dispersing said adduct, in the form of a water insoluble liquid phase, into an aqueous liquid medium containing PA1 A. an anionic or cationic oil-in-water functioning emulsifying agent, in the presence of PA1 B. an aliphatic hydrocarbon or hydrocarbyl alcohol which is inert, non-volatile, water insoluble, liquid, and contains a terminal aliphatic hydrocarbyl group of at least about 8 carbon atoms; homogenizing the resulting crude emulsion to reduce the average size of the dispersed phase particles to below 0.5 .mu.; polymerizing the dispersed polyurethane particles in the resulting stable emulsion at suitable temperatures; coating substrates with the emulsions; the adducts, emulsions and coated substrates so produced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.