Unlock instant, AI-driven research and patent intelligence for your innovation.

Coating composition comprising hydrolysed wheat proteins

a technology of hydrolysed wheat protein and coating composition, which is applied in the direction of coating, coating, paper coating, etc., can solve the problems of large technical challenge, difficult to maintain the performance level of coating color, and use of synthetic latex proportion

Inactive Publication Date: 2018-02-15
TEREOS STARCH & SWEETENERS BELGIUM
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text is discussing the benefits of using hydrolyzed wheat proteins in coating colors. These proteins are more soluble than soy proteins, which means they can be added directly to the color without needing to be diluted first. This helps to control the dry matter content of the color, making it easier to create different variations.

Problems solved by technology

In order to reduce the number of chemical products used in this industry, and to reduce the consumption of petroleum-derived products and also the costs, the replacement of latex in coating colors represents a potential market but also a sizeable technical challenge.
This is because it is very difficult to maintain the performance levels of a coating color while reducing the proportion of synthetic latex used.
However, these starches have a tendency to form aggregates during the dissolving thereof; they also require the use of a high-shear mixer with which most paper manufacturers are not equipped.
Thus, in the case of non-uniformity or of excess viscosity, these shear forces lead not only, at the level of the application zone, to turbulences responsible for defects in the deposit, called “filaments” or “beads”, but also to an increase in the pressure exerted on the paper, increasing by the same token the risks of breakage and thus potentially hours of production interruption.
However, the reduction of the dry matter of the composition (and thus the increase in the water content) in order to reduce the viscosity thereof is not an advantageous solution in the present application.
This has several consequences, the first of which is the weakening of the paper or of the cardboard which, due to the excess water, can lose its integrity and can lead to breaking of the paper produced and thus hours of production interruption.
This migration leads to a third consequence which is the weakening of the cohesion of the layer of the paper, leading to problems during printing.
Moreover, among the approaches envisioned in the replacement of latex, none makes it possible to improve or at the very least maintain the pick resistance capacities of the paper or cardboard obtained.
This phenomenon is responsible for the fouling of the blankets and can make it necessary for the printer to interrupt production in order to clean them.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

Replacement of Latex by a Modified Starch

Production of Coating Colors:

[0062]Preliminary tests showed that the best results were obtained with a dry matter content greater than 45% (machinability and energy yield). A clearer improvement is observed from 60%. Indeed, an increase in the breaking of the paper when the coating color is diluted (less than 45% of DM) was noted. Furthermore, an increase was noted in the drying time below 60% and even more below 45%, which appears to be the lowest acceptable dry matter content. Since the paper undergoes a drying step after coating, any excess water in the coating color results in an increase in the drying times and thus in the production cost. Consequently, the tests were continued with coating colors having a dry matter content of 70%.

[0063]A coating color was produced according to formulae R1 to R4 of table 1 below.

TABLE 1Coating compositionscomprising dextrin as partialreplacement for latexCalciumSyntheticcarbonatebinderDextrinR11003.53.5...

example 2

Replacement of Latex with Hydrolyzed Soy or Wheat Proteins

[0076]The use of plant proteins as a replacement for latex was evaluated. After several tests, it was noted that the addition of proteins in addition to the dextrin makes it possible to observe better results in the replacement of latex than those observed for the dextrin alone, more particularly regarding the dry pick properties of the composition obtained. This effect was observed only for hydrolyzed proteins, not for native proteins. Thus, nonhydrolyzed wheat gluten, because of its low solubility, does not make it possible to obtain uniform coating colors of acceptable viscosity, and even less so the replacement of latex. In order to evaluate the effect of replacing the latex with hydrolyzed proteins of various botanical origins, the R1 mixture was chosen as reference recipe for a coating color.

[0077]The coating colors were produced as in example 1 according to the formulae of table 3 in which the synthetic latex is replac...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Fractionaaaaaaaaaa
Login to View More

Abstract

A paper or cardboard coating composition having a dry matter content of between 45% and 80%, comprising i) binders which include at least one modified starch and one adhesive, ii) a hydrolyzed wheat protein having an average molecular weight of between 7 and 1000 kDa, and iii) a mineral filler, and also the method for obtaining such a composition. A method for coating or brightening paper or cardboard, comprising the steps consisting of i) the provision of a composition as described, and ii) the depositing of said composition on a paper or cardboard substrate, and to the coated paper or cardboard thus obtained. Finally, the use of a hydrolyzed wheat protein in the replacement of latex in a paper or cardboard coating composition.

Description

[0001]This application claims the benefit of French patent application No. 15 / 00337, filed Feb. 23, 2015, which is hereby incorporated by reference in its entirety.TECHNICAL FIELD[0002]The present application relates to a paper or cardboard coating composition comprising a modified starch and a hydrolyzed wheat protein, and also to the method for obtaining such a composition. The application also relates to a method for coating or brightening paper or cardboard using such a composition, and to the coated paper or cardboard thus obtained. Finally, the application relates to the use of a hydrolyzed wheat protein in the replacement of latex in a paper or cardboard coating composition.TECHNICAL BACKGROUND[0003]Coating is a paper or cardboard finishing step which makes it possible to confer on a sheet of paper or on a cardboard a certain number of properties, such as opacity, gloss or whiteness or else to improve the printability for printing processes such as offset printing or photogra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): D21H19/54D21H19/38D21H19/50
CPCD21H19/54D21H19/50D21H19/385D21H17/22
Inventor PERALBA, MAGALIERIVOLTA, VITTORIOFREDERIX, SOFIE
Owner TEREOS STARCH & SWEETENERS BELGIUM