Aqueous multi-stage emulsion copolymer compositions for use in joinery applications
US10190002B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2016 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | May 10, 2037 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/25
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides aqueous compositions for use in coating wood joinery, especially for exterior use, comprising (a) one or more dihydrazide compounds in a total amount of from 0.5 to 4 wt. %, based on the total weight of composition solids and (b) of one or more aqueous multistage emulsion copolymers containing, as (i) a first stage, an emulsion copolymer having a glass transition temperature (Tg) via differential scanning calorimetry (DSC) of from −50 to 30° C., and containing, in copolymerized form one or more monoethylenically unsaturated phosphorous acid monomers and, one or more keto group containing amide monomers, and, as (ii) a second stage, an emulsion copolymer having a DSC Tg of at least 50° C. to 125° C., wherein the weight ratio of (i) the first stage to (ii) the second stage, based on copolymer solids, ranging from 50:50 to 90:10.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.