Agent for forming surface-protecting layer on coated paper
US4581394A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 6, 1984 |
| Grant date | Apr 8, 1986 |
| Priority date | — |
| Expiry date | Nov 6, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31895
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An agent for forming a surface-protecting layer on a coated paper, which comprises an aqueous solution of an alkali metal salt, ammonium salt or amine salt of a graft copolymer and an epoxy group-containing cross-linking agent incorporated in the aqueous solution, said graft copolymer comprising (A) 10 to 60% by weight of a polyvinyl alcohol polymer selected from the group consisting of partially saponified polyvinyl alcohols, polyvinyl alcohols containing copolymerized units of a vinyl monomer having carboxyl group, and polyvinyl alcohol having the recurring vinyl alcohol units esterified with a higher fatty acid, (B) 20 to 70% by weight of acrylamide or methacrylamide, (C) 5 to 30% by weight of at least one member selected from the group consisting of acrylonitrile, methacrylonitrile, lower alkyl esters of acrylic acid and methacrylic acid and hydroxyl lower alkyl esters of acrylic acid and methacrylic acid, and (D) 5 to 20% by weight of at least one vinyl monomer containing a carboxyl group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.