Coated front copy paper
US4762868A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1988 |
| Grant date | Aug 9, 1988 |
| Priority date | — |
| Expiry date | Jun 13, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31967
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A coating composition for coated front copy papers comprises pre-treated carboxylated soybean protein, pigment, binder, phenolic resin, and defoamer. In a preferred embodiment, the carboxylated soybean protein is pre-treated by the steps of: PA1 (a) adding carboxylated soybean protein to water in a mixer, PA1 (b) continuing mixing to achieve an even dispersion, PA1 (c) heating the dispersion to a temperature of 58.degree.-65.degree. C. while continuing mixing, PA1 (d) adding sufficient ammonia solution to neutralize the carboxylic acid groups in the protein, and PA1 (e) maintaining the temperature in the range 58.degree.-65.degree. C. until the reaction is complete as indicated by pH, or by complete dissolution of the protein, and PA1 (f) adding defoamer and mixing by gentle agitation. A method for coating paper is also claimed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.