Process for producing stable latex
US5284905A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 12, 1993 |
| Grant date | Feb 8, 1994 |
| Priority date | — |
| Expiry date | Feb 12, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F257/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The subject invention discloses a process for producing a neutralized latex that is useful in the manufacture of water reducible coatings which involves. PA0 (1) free radical aqueous emulsion polymerizing at a pH of less then about 3.5, a monomer mixture which comprises based on 100 weight percent monomers: (a) from about 45 to about 85 weight percent vinyl aromatic monomers, (b) from about 15 to about 50 weight percent of at least one alkyl acrylate monomer, and (c) from about 1 to about 6 weight percent of at least one unsaturated carbonyl compound; in the presence of about 0.5 to 4.0 phm at least one phosphate ester surfactant; in the presence of about 0.5 to 4.0 phm of at least one water insoluble nonionic surface active agent to produce a latex; and in the presence of at least one seed polymer which contains repeat units which are derived from about 45 to about 85 weight percent vinyl aromatic monomers, from about 15 to about 50 weight percent alkyl acrylate monomers, and from about 1 to about 6 weight percent unsaturated carbonyl compounds; and PA0 (2) neutralizing the latex with ammonia to a pH which is within the range of about 7 to about 10.5 to produce the neutralized lat…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.