Method for repulping fibrous materials containing crosslinked polyamide wet strength agents with enzyme
First Claim
Patent Images
1. A method of repulping fibrous paper or paperboard sheet materials containing a polyamide wet strength resin which is crosslinked with epicholorhydrin which comprises reacting said fibrous materials with an enzyme selected from the group consisting of bromelain, pepsin, tyrspin, alcalase, savinase, and mixtures thereof, in an amount sufficient to hydrolyze said resin.
8 Assignments
0 Petitions
Accused Products
Abstract
A method for treating fibrous sheet materials such as paper or paperboard containing polyamide resin as a wet strength agent which comprises reacting the fibrous materials with an enzyme to hydrolyze the resin and thereby improve repulping of the fibrous materials.
25 Citations
12 Claims
- 1. A method of repulping fibrous paper or paperboard sheet materials containing a polyamide wet strength resin which is crosslinked with epicholorhydrin which comprises reacting said fibrous materials with an enzyme selected from the group consisting of bromelain, pepsin, tyrspin, alcalase, savinase, and mixtures thereof, in an amount sufficient to hydrolyze said resin.
-
9. A method of treating fibrous paper or paperboard sheet materials containing a polyamide wet strength resin which is crosslinked with epichlorohydrin which comprises the steps of:
-
(a) forming an aqueous slurry of said polyamide-containing, fibrous material; (b) adding to said slurry about 1 to 4000 units/g (dry fiber weight) of an enzyme selected from the group consisting of bromelain, pepsin, tryspin, alcalase, savinase and mixture thereof to effectively hydrolyze said polyamide resin, and (c) reacting said slurry containing said polyamide-containing, fibrous material with said enzyme at a pH of about 4 to 10 and a temperature of less than about 70°
C. - View Dependent Claims (10, 11, 12)
-
Specification