Vinyl acetate/ethylene copolymer emulsions exhibiting both partially- and fully-hydrolyzed polyvinyl alcohol compatibility
US4521561A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 29, 1984 |
| Grant date | Jun 4, 1985 |
| Priority date | — |
| Expiry date | Feb 29, 2004 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2666/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A vinyl acetate/ethylene copolymer emulsion exhibiting both partially- and fully-hydrolyzed polyvinyl alcohol compatibility which comprises an aqueous colloidal dispersion of a copolymer prepared by the emulsion polymerization of vinyl acetate and ethylene in the presence of a polyvinyl alcohol stabilizing system having an 8 to 10 mole % residual vinyl acetate content, especially comprising a mixture of a polyvinyl alcohol having a 3 to 6 mole % vinyl acetate content and a polyvinyl alcohol having a 10 to 14 mole % vinyl acetate content in a ratio that yields an average residual vinyl acetate content of 8 to 10 mole %. When blended with a partially- or fully-hydrolyzed polyvinyl alcohol to provided an adhesive composition, such compositions demonstrate an enhanced plasticizer thickening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.