Blocked tin catalyst system for use with mercapto resin/acrylic resin blends
US5478790A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 20, 1994 |
| Grant date | Dec 26, 1995 |
| Priority date | — |
| Expiry date | Apr 20, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09D175/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
In its broadest aspects, the present invention is directed to a tin or bismuth catalyst/mercapto complex as disclosed in U.S. Pat. No. 4,788,083 which catalyst complex exhibits substantially the same stability and activity after extended periods of storage as it exhibits upon initial formation. Such long term storage stability is achieved by restricting the vehicle for the catalyst complex to one that will not react with said mercapto compound upon extended storage of said catalyst system. Advantageous such vehicles include aromatic hydrocarbons and terpenes. Importantly, ketone vehicles are excluded from the catalyst complex formulation. Preferred vehicles include toluene, xylene, turpentine, d-limonene, aromatic petroleum distillates, and mixtures thereof. Corresponding method for forming the stabilized catalyst complex forms yet further aspect of the present invention. As another aspect of the present invention, the present invention is directed to polymercapto resin/polyisocyanate formulations as disclosed in U.S. Pat. No. 4,753,825 which are more stable by dint of the elimination of ketonic and like vehicles that are involved in unintended side reactions with the mercapto cont…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.