Moisture curing polyurethane topcoat paint with improved gloss stability
US4243792A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 11, 1977 |
| Grant date | Jan 6, 1981 |
| Priority date | — |
| Expiry date | May 11, 1997 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31551
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In a preferred embodiment, an improved moisture curing urethane resin that is durable in the presence of moisture and sunlight is formed by reacting an excess of a suitable aliphatic isocyanate with a suitable mixture of organic triols and diols and a hindered piperidine type stabilizer, e.g., bis(2,2,6,6 tetramethyl piperidinyl-4) sebacate in the presence of an organotin urethane forming catalyst such as dibutyltin dilaurate. This resin mixture product may be formulated with pigments, solvents and the like to form a topcoat paint that, upon application to a substrate, is curable under conditions of high relative humidity but relatively low temperatures (e.g., about 90.degree. C.). The cured paint has excellent gloss stability due to the chemical incorporation of the stabilizer segments throughout the binder resin molecules.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.