Method for making waterborne polyurethane with a reactive functional group and a nanocomposite made of the same
US9150753B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 2014 |
| Grant date | Oct 6, 2015 |
| Priority date | — |
| Expiry date | Aug 1, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K9/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for forming an aqueous polyurethane dispersion including providing an isocyanate (NCO)-terminated prepolymer with a side-chain reactive functional group by admixing (i) at least one diisocyanate, (ii) at least one difunctional polyol, (iii) a short-chain diol monomer having a side-chain reactive functional group or a modified clay thereof, (iv) at least one hydroxy carboxylic acid compound and (v) a hydrophilic cosolvent; neutralizing the NCO-terminated prepolymer with a tertiary amine; dispersing the NCO-terminated prepolymer in water; and admixing the NCO-terminated prepolymer with at least one chain extending agent comprising a hydrophilic diamine; wherein the short-chain diol monomer (iii) is expressed by structural formula (I):wherein, A is an azetidine-2,4-dione functional groupor a malonamide-linked alkyl groupand B is a nitrogen-linked di-hydroxy terminal groupor tertiary amine-linked di-hydroxy terminal groupwherein IDD was synthesized by methylenedi-p-phenyl diisocyanate and isobutyryl chloride using triethylamine as catalyst.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.