Vesiculated beads
US4461849A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1983 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Jul 26, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L67/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Vesiculated beads having improved scattering efficiency and resistance to shrinkage are prepared by a process which comprises: PA0 (a) forming in the presence of a polyamine, as a water-in-oil emulsion, a stable dispersion of droplets of water in a solution of a carboxylic acid functional unsaturated polyester resin having an acid value of 8 to 20, and at least one ethylenically unsaturated monomer copolymerizable with the polyester; and PA0 (b) forming in an aqueous solution, as a water-in-oil-in-water emulsion, a stable dispersion of the globules of the droplet-containing amine neutralized solution of the carboxylic acid functional unsaturated polyester and copolymerizable monomer; and PA0 (c) polymerizing the polyester and copolymerizable monomer by free radical addition polymerization thereby producing granules of opaque, cross-linked vesiculated beads; wherein the polyamine contains at least 3 amine groups per molecule; and wherein the amine is present at a concentration such that there are at least about 2.0 amine groups per each carboxylic acid group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.