Polysaccharide graft polymers containing acetal groups and their conversion to aldehyde groups
US4866151A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 1987 |
| Grant date | Sep 12, 1989 |
| Priority date | — |
| Expiry date | Oct 26, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F251/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Polysaccharide graft polymers which comprise an acetal-containing or aldehyde-containing homopolymer or copolymer grafted to a polysaccharide base have been prepared. The monomer repeating units in the homopolymer are derived from one or more ethylenically or allylically unsaturated monomers containing an acetal group or aldehyde group; The monomer repeating units in the copolymer are derived from the above monomer and derived from one or more ethylenically or allylically unsaturated monomers other than the acetal-containing or aldehyde-containing monomer. A and A' are independently a lower alkyl or A and A' together form at least a 5-membered cyclic acetal; with the proviso that the graft polymer contain no ##STR1## groups when the aldehyde groups are present. The aldehyde-containing graft polymers are useful for imparting wet strength to paper. Various novel acetal- and aldehyde-containing monomers have also been prepared; they can be graft polymerized to polysaccharide substrates or polymerized by conventional emulsion polymerization techniques with vinyl polymerizable monomers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.