JPS59163499A - Fiber bond weakening compound consisting of diamide quaternary ammonium compound and alkoxylated fatty acid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to paper bond weakening agents (d, ebonders), and more particularly to novel paper or fiber debonding formulations.

Partly due to publicity, consumers are expecting a soft, fluffy facial tissue-2 and a water mosquito-repellent toilet tissue-Δ. Additionally, the goal of some factory tissue manufacturers is to provide a single ply bathroom tissue that has the appearance of a standard double tissue in fluffy feel, softness, and overall appearance. The process of processing wood pulp to achieve the softness and fluffy feel that consumers expect once the tissue loses its ability to absorb moisture involves the use of paper bond weakening agents (
Use paper debonder.

The paper bond weakening agent reduces the tensile strength of the tee/knee by weakening the bond between the cellulose fiber pairs. Desirably, the tinny's ability to absorb total moisture is not adversely affected by the paper bond weakening agent.

Paper bond weakening agents are currently being used in two consumer product lines; one line is in disposable tissue (facial and bathroom) products; In this case, bond weakening agents should be added to the pulp slurry in the wet final part of the tissue manufacturing operation. These bond weakening agents will produce a finished tissue with improved softness.
is expected to give. Disposable diapers are the second consumer product system that uses bond weakening agents, and their use is somewhat different in disposable tissue manufacturing. When added to the pulp slurry during the wet final stage of a diaper manufacturing operation (i.e. at the same point of manufacture as in a disposable tissue manufacturing operation), bond weakening agents act as processing aids to fluff the finished paper sheet. It helps to make bulky diaper sheets.The anti-resistance of pulp fiber
The rectangular drop thus assists the mechanical picker in fluffing the dried pulp into a lofty sheet that is soft yet possesses excellent water absorbency.

A variety of paper bond weakening agents are used commercially and proposed in the literature. For example, U.S. Patent No. 8,554,862 proposes bond weakening agents that are cationic long chain aliphatic alkyl compounds having at least 12 carbon atoms in at least one of the alkyl chains; , U.S. Patent No. 3.9 B
No. 0,933 uses the same cationic compound in combination with a natural non-drying oil. British Patent No. 1,407,134 describes the use of imidacillins as paper bond weakening agents. U.S. Patent No. 4.144. ．． No. 122 is a bis(alkoxy)- containing both cationic and nonionic hydrophilic groups.
It is proposed to use (2-hydroxypropylene) quaternary ammonium compounds as paper bond weakening agents. Even though conventional bond weakening agents function effectively in reducing the bonding between cellulosic fibers, the risk of one-sided bonding is common.

The present invention is not only effective in reducing the total bond between cellulosic fibers, but is also non-toxic and safe (less irritating to the skin);
It is aimed at a new fiber optic weakening method.

DETAILED DESCRIPTION OF THE INVENTION The present invention is a method for reducing fiber-to-fiber bonding and mechanical strength of webs formed therefrom.

This method uses an aqueous cellulosic pulp slurry (wherein
R+=CsCso aliphatic group, R2-(polyoxyalkylene)hydrokinealkyl group, R3-C,1C4 alkyl group, X-=monovalent anion), and (b) alkoxylated CaCso fatty acid bond. Characterized by mixing with a weakening formulation. A resulting web of weakened cellulosic Phinocou pulp with reduced interfiber bonding and reduced mechanical strength is produced from the above method and further constitutes an aspect of the present invention.

An advantage of the present invention is that it provides a fluffy web of treated pulp so that the web spanning sheet has better moisture absorption properties, reduces interfiber bonding and reduces mechanical strength. Includes superior leakage performance imparted by paper bond weakening agents. Another advantage is that the bond weakening formulation components are non-toxic and non-irritating.

Another advantage of this bond-weakening formulation is that it is liquid at room temperature and can be easily handled by the fluffing valve or tissue manufacturer.

These and other advantages will be readily apparent to those skilled in the art based on the disclosure contained herein.

The alkoxylated fatty acids used in the release formulations of the present invention have not previously been recognized as effective paper bond weakening agents by themselves, but in combination with the disclosed quaternary ammonium compounds and alkoxylated fatty acids. The modified fatty acids provide a unique (synergistic) fiber bond weakening formulation that is highly effective and its effectiveness is completely unexpected based on the prior art.Thus, one of the features of the present invention What must be considered in the evaluation is the unique combination of ingredients that make up the bond-weakening formulation, rather than each individual ingredient itself.

First, regarding quaternary ammonium compounds, such quaternary amidoammonium compounds can be represented by the general formula.

In this general formula, R1 consists of a Cs Cso aliphatic group, preferably such a group is a hydrocarbyl (aliphatic) group.However, oxygen and nitrogen may sometimes be present among such substituents. and their existence (
However, it is acceptable as long as the resulting quaternary ammonium compound compound in combination with the alkoxylated fatty acid provides a bond-weakening formulation with the necessary flow properties for use as a paper bond-weakening agent in commercial-scale operations. I have to admit that. Thus, preferably R1 is represented by Cl2-, which is a fatty acid group derived from natural and synthetic fatty acids.
CIA aliphatic group. R2 consists of a (polyoxyalkylene)hydroxyalkyl group, which results from alkoxylation of the attached amine nitrogen. Bokushikake,
No I! 2 results from ethoxylation or propoxylation of the attached amine nitrogen. R3 is Shizuko or C1C
It is a 4-alkyl group, resulting from the conventional alkylation of a tertiary amine to form a quaternary ammonium compound. X
are the m anions that are commonly encountered in the formation of quaternary ammonium compounds, most frequently halogens, nitrates, acetates, hydrooxides, monoxides, etc., although chlorine and sulfate are the most common. It is true.

The synthesis of these quaternary ammonium compounds is based on soethylenetriamine (2,2'-diaminoneethylamine). The diethylenetriamine molecule is reacted with a CsC3n carboxylic acid to form an amide group. The resulting diamidoamine is then alkoxylated in a conventional manner and to an extent of 1 resulting in essentially 100% tertiary amine content of the reaction mixture.Theoretically, approximately Although only 1 mole of alkylene oxide is required for this reaction, an excess of e.g. up to 50% is generally used to ensure the required tertiary amine content.As mentioned above, ethylene oxide and propylene oxide is the reactant of choice, resulting in the formation of the 1f12 substituent group.Finally, the diamide tertiary amine molecule is alkylated in a conventional manner to form the resulting quaternary ammonium structure.Alkyl halogen, alkyl nitrate salt. , alkyl sulfates, etc., are conventionally used in this reaction to yield the R substituent and the X-valent anion. The resulting quaternary ammonium compound can be cut in a glycol or similar solvent to increase its handling properties. , and/or the full concentration of quaternary ammonium compound activity desired to formulate the bond-weakening formulations of the present invention.

The proportion of quaternary ammonium compound in the final bond-weakening formulation is generally about 10% by weight of the formulation.
d5()X.

Alkoxylated Cs Gso fatty acidsvIn particular, this fatty acid is of conventional character, and is widely used as Cs
Cso fatty acids are advantageously CI2 C22 and preferably CIs fatty acids. The fatty acids are alkoxylated in a conventional manner, preferably with ethylene oxide, except for propylene oxide, butylene oxide, B and Ike's conventional alkylene oxides. The proportion of alkoxy groups (should be between about 2 and about 12 moles of alkoxy groups per mole of fat, advantageously between about 4 and 7 moles per mole of fatty acid) Should be alkoxylated in the bond-weakening formulation (
The percentage of fatty acids is approximately 90% to 50% by weight of the formulation.
It is located at 1uj.

The bond-weakening formulation may optionally contain a small amount of solvent to improve its overall flow and handling properties. For example, propylene glycol and the like may be used therein to improve the overall handling properties of the bond weakening formulation without adversely affecting the pulp. Additional such flow-improving solvents include, for example, alkanols, other alkylene glycols, ethers, and the like. When a flow-enhancing solvent is used in the formulation, the proportion of alkoxylated fatty acids is reduced to provide between about 40 and 60 weight N% alkoxylated fatty acids and between about 5 and 20% flow-enhancing solvent. Adapt it to do so.

In practicing the present invention, the bond-weakening formulation is prepared by mechanically mixing the quaternary ammonium compound's alkoxylated fatty acid in an all-through manner and optionally also by including a flow-enhancing solvent. Easily manufactured. This bond weakening formulation is applied to the aqueous pulp slurry in a conventional manner.

The type of pulp used is not a limitation on the use of this bond weakening formulation and can be conventional kraft or sulfide pulp. The bond weakening formulation is approximately 0.
Between 1% and 2% (by weight of dry pulp solids), the weight of the oil is about 0.2% and 1%, and the sweetness is about 0.2% and 0.
．． It is added at a rate between 4% and 4%. As above,
This pulp slurry can be considered for tissue manufacturing, disposable diaper manufacturing, or any other cellulosic fiber manufacturing where reduced tensile strength is desired. Preferably, the pulp slurry is fluffed for making disposable diapers, sanitary absorbent materials, and the like.

The following examples illustrate how the invention may be practiced, but should not be considered limiting. In this patent application, parts and percentages are by weight and all units are in the metric system unless otherwise specified.

Example 50 Gno wood half (Aibacelp white kraft kneaded uvqts bleached zulfite) was added to a 4 liter volume of TA for each bond weakening agent evaluated.
Placed in a PPI Standard 30 Q rprn disintegrator. Approximately 3 liters of tap water was added and allowed to disperse into the wood bulb for approximately 5 minutes. Next, add the bond weakening mixture at a ratio of 4.0 g/pulp for 1.54 ft,
Continue stirring for an additional 2 minutes. The slurry from Tutan t't+'r was diluted with tap water for use in manual sheet production. This manually made sheet (nominally 60g/
rn2) was made in a TAPPI/-tomold.

If removed from the mold and dried with blotting paper, press 3.5 to 5 at 9/(:m2C50psi) for the first press.
minutes, followed by a second press for 2 minutes. The compressed sheeters were then placed for drying overnight in a TAPPI drying ring under standardized conditions of constant temperature of 21.1°C (70°F) and 50% relative humidity.

This hand-adjusted sheet was tested according to the following standard test method: ((L) Manual Sheet Formation, T A l) P I
Test method T205om 81: (b) Physical test of manually made sheets, TAPPI test method 7'22Dos-71; (c) Z-direction tensile test, 7' A P P I test method T506su, -68:'j6 and (d ) Water absorption due to one par V in lightweight phrebut, Canadian test method CPPAF, 7 P (PAf
-74) Candidates for bond weakening agents were blended as follows.

These bond weakening agents were added to the pulp at a ratio of k 1.5 r /kg·pulp. The pulp was softwood kraft pulp (Al)bacel for the first test series and softwood sulfide pulp (puget S) for the second test series. The following test results were recorded.

The results presented above demonstrate the bond-weakening effect achieved by the bond-weakening formulation of the present invention. To make this data easier to understand, the strength reduction of hand-made sheets is shown.

The results shown above demonstrate the overall reduction imparted by the new bond weakening agent formulation. Even though the overall strength is significantly reduced, the water absorption rate remains essentially constant 11
Met.

Example 2 Next, in order to demonstrate the synergistic effect achieved by diamide-ammonium quaternary bond weakening j11] in combination with gold alkoxylated fat adversaries (/?-), alkoxylated fatty acids with and without total combination were used. The bond weakening agent formulation was evaluated at a usage rate of 47/lack pulp.The other lily weakening agent formulations are as shown in the arrow.

Sample number Weight % Component reference standard
None 5c61-53 30.0 Bis(oleylamide ethyl)-(2-hydroxyethyl)-methylammonium methylsulfate 70.0 Isoprotumanol SC50-40F' 3 u, 0 Bis(oleylamide ethyl)-(2-hydroxyethyl)-methylammonium methylsulfate 70.0 7 moles of oleic acid 4th coating test control standard 5C61-535C50
-40F7"APPI manual installation seat 2UUOCTL" (9) L12 L2
4 L24 tsubo ft (?/m2) 55.8 12
6L8) J'l-i (mm) Old 22
0.139 (1148 apparent density (2/mark)
α459 (14440,418 volume (CC
/S') 2.18 Z25
2-39 Mullen breaking strength 8L1
5 & 3 3a2 (kPa 1 Tensile strength (K9/m) 143 11a0
673 Breaking length (km) 2.569
L822 L (189 The strength reduction percentage based on the mackerel rice shown above is as follows.

Sample number (% reduction) Test 5C61-535C50-40F Mullen bursting strength 28.1 59.1 Tensile strength
21,0 52.9 The results shown above show that the addition of alkoxylated fatty acids to the quaternary bond weakened ill resulted in a 40% decrease in Mullen burst strength and a 67% decrease in tensile strength. The dramatic effects of bond-weakening column formulations have been demonstrated.

Claims (1)

[Claims] L A web of debonded (debonclecL) cellulose fiber-pulp with reduced fiber-to-fiber bonding forces and reduced mechanical strength, the web comprising (cxl
General formula (wherein, R+ = Cs Cso aliphatic group, R2-(polyoxyalkylene) hydroxyalyal group R3 = C+ C4 alkyl group X = quaternary ammonium compound lacking -valent anion, and (b) alkoxylated Cs A web characterized in that it is impregnated with a debonding formulation comprising C3o fatty acids. 2 Between about 0.1% and 2% of said debonding formulation by weight of said dry pulp solids. A web of exfoliated cellulose fiber pulp as claimed in claim 1 impregnated with: a web of exfoliated cellulose fiber pulp as claimed in claim 1 impregnated with between about 2% and 1% of said bond weakening formulation. A web of bond-weakened cellulose fiber pulp according to Range 2. t For the quaternary ammonium compound (α), R1 is C
, 2-C,8 aliphatic group di, R2 is ethoxylate,
A web of bonded weakened cellulose fiber pulp according to claim 1, which is a residue of polyethoxylate, proboxylate, or polypropoxylate. & the above alkoxylated fat chain (b+ is ethoxylated C,
A web of bonded weakened cellulose fiber pulp according to claim 1, having a 2- to 22 fat content. G The above fatty acid is about 2 moles and 12 moles per mole of this fatty acid.
Web of bond weakened cellulose fiber pulp according to claim 5, ethoxylated with between moles of ethylene oxide; A web of bond-weakening cellulose fiber pulp according to claim 4, which is an ethoxylated Cl2-C22 fat ethoxylated with ethylene oxide between about 10% and about 50%
The above quaternary ammonium compound (α) between about 9 by weight
between 0% and about 50% of the above alkoxylated fat Ub+
A web of bonded weakened cellulose fiber pulp according to claim 1, comprising: A web of bonded weakened cellulose fiber pulp according to claim 1, additionally comprising a fluidized bed enhancing solvent. 10. The web of bonded weakened cellulose fiber pulp of claim 9, wherein said fluidized bed enhancing solvent comprises an alkylene glycol. A method of treating IL cellulose pulp fibers to reduce interfiber bonding and reduce the mechanical strength of webs formed therefrom; a group, R2-(polyoxydialkylene hydroxyalkyl group R3=C, -C, alkyl group 12. The method of claim 11, wherein the cellulose pulp fiber is mixed with a bond weakening compound of between about 1% and about 2% by weight of the dried pulp fiber. about 0.2% and 1
13. The method of claim 12, wherein between % of said bond weakening formulation is mixed. 14 The above quaternary ammonium compound (for α1, Ro
is a C,, -C,8 aliphatic group, and R2 is an ethoxylate, a polyethoxylate, a propoxylate, or a residue of a polypropoxylate, the bond-weakened cellulose fiber according to claim 1. Pulp web. 1 & Claim 1, wherein the alkoxylated fatty acid to be mixed is an ethoxylated Cl2-C22 fatty acid.
The method described in Section 1. IG above fat [・2 is the molar equivalent of this fatty acid! 16. The process of claim 15, wherein 9 is ethoxylated with between about 2 and about 12 moles of ethylene oxide. 17. The method of claim 14, wherein the alkoxylated fatty acid is an ethoxylated CI2C2□ fatty acid that is ethoxylated with between about 4 and 7 moles of ethylene oxide per mole of fatty acid. The bond weakening formulation mixed with the aqueous cellulose pulp slurry comprises between about 10% and about 50% by weight of the quaternary ammonium compound (α) and about 90% by weight.
and about 50% of said alkoxylated fatty acid (b). 19. The above bond weakening formulation is effective @j skin increase 5! The method according to claim 18, additionally comprising a Ii solvent. 2(l) The method of claim 19, wherein the fluidized bed enhancing solvent is an alkylene glycol.