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Hydrophobic polymers and their use in preparing cellulosic fiber compositions

a cellulosic fiber and polymer technology, applied in the field of hydrophobic polymers and copolymers in the preparation of cellulosic fiber compositions, can solve the problems of insufficient retention, affecting limiting the speed of papermaking machines,

Inactive Publication Date: 2006-11-30
HERCULES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0014] The invention further relates to cellulosic fiber compositions, including an aqueous slurry of cellulosic pulp, containing such water compatib...

Problems solved by technology

As to drainage / dewatering improvement, drainage or dewatering of the fibrous slurry on the papermaking wire or fabric is often the limiting step in achieving faster machine speeds.
Without adequate retention of the fine solids, they are either lost to the mill effluent or accumulate to high levels in the recirculating white water loop, potentially causing deposit buildup.
Additionally, insufficient retention increases the papermakers' cost due to loss of additives intended to be adsorbed on the fiber to provide paper opacity, strength, or sizing properties.
It has been found, unexpectedly, that hydrophobic polymers or copolymers provide unanticipated retention and drainage activity and can function as contaminant control aids in applications including papermaking applications Although the synthesis methods employed are generally known to those skilled in the art, there is no prior art suggesting that the unique physical characteristics would result in the unanticipated activity observed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0095] To a suitable reaction flask equipped with an overhead mechanical stirrer, thermometer, nitrogen sparge tube, and condenser, charge an oil phase of paraffin oil (135.0 g, Escaid® 110 oil, Exxon—Houston, Tex.) containing surfactants (4.5 g Atlas® G-946 and 9.0 g Hypermer® B246SF), to which 1.77 g of OA (t-octylacrylamide) is added. The temperature of the oil phase is adjusted to 37° C.

[0096] An aqueous phase is prepared separately which comprises 53-wt. % acrylamide solution in water (126.5 g), acrylic acid (68.7 g), deionized water (62.12 g), and Versenex® 80 (Dow Chemical) chelant solution (0.7 g). The aqueous phase is then adjusted to pH 5.4 with the addition of ammonium hydroxide solution in water (33.1 g, 29.4-wt. % as NH3). The temperature of the aqueous phase after neutralization is 39° C.

[0097] The aqueous phase is then charged to the oil phase while simultaneously mixing with a homogenizer to obtain a stable water-in-oil emulsion. This emulsion is then mixed with a ...

example 2-5

[0101] Examples 2-5 were prepared as described in example 1 except that the molar composition of monomer was as shown in Table 1.

TABLE 1Exam-Monomer 1Monomer 2Monomer 3pleMonomer(a)%(b)Monomer(a)%(b)Monomer(a)%(b)2Acrylic Acid50.00Acrylamide49.75COPS10.253Acrylic Acid50.00Acrylamide49.60BEM-250.404Acrylic Acid50.00Acrylamide49.90SEM-250.105Acrylic Acid50.00Acrylamide49.7050100.30

(a)Monomer(s) used in the example.

(b)Mole % of monomer, based on total monomer

[0102] Prior to inverting the emulsions of Examples 1 to 5 for analysis or use, ˜2 wt. % of a breaker surfactant, for example a 80:20 by weight mixture of Tergitol 15-S-9 (Dow, Midland, Mich.) and Aerosol-OT-S (Cytec Industries, West Patterson, N.J.), was added. The pH of the inverted water-soluble anionic copolymers was then adjusted to a minimum of 7.0 with aqueous sodium hydroxide or ammonium hydroxide, as required.

examples 6-10

[0103] Example 6 is PerForm® 9232 Retention and Drainage Aid (Hercules Incorporated, Wilmington, Del.)

[0104] Example 7 is Acrysol® TT-935 a HASE material marketed by Rohm and Haas Company, Philadelphia, Pa.

[0105] Example 8 is a copolymer of butylacrylate and acrylic acid, monomer molar ratio at 50:50, obtained from Polysciences, Inc., Warrington, Pa.

[0106] Example 9 is poly(N-isopropylacrylamide) obtained from Scientific Polymer Products, Inc., Ontario, N.Y.

[0107] Example 10 is poly(N,N-dimethylacrylamide) obtained from Scientific Polymer Products, Inc., Ontario, N.Y.

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Abstract

A method of improving retention and drainage comprising adding a water compatible hydrophobic copolymer to a papermaking slurry is disclosed. A composition comprising a water compatible hydrophobic copolymer is described.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001] This application claims the benefit of U.S. Provisional Application No. 60 / 684,816, filed May 26, 2005, the entire content of which is herein incorporated by reference.FIELD OF THE INVENTION [0002] The present invention relates to the use of hydrophobic polymers and copolymers in the preparation of cellulosic fiber compositions. The present invention further relates to cellulosic fiber compositions, such as paper and paperboard, which incorporate the water compatible hydrophobic polymers or copolymers. BACKGROUND OF THE INVENTION [0003] The making of cellulosic fiber sheets, particularly paper and paperboard, includes the following: 1) producing an aqueous slurry of cellulosic fiber; which may also contain inorganic mineral extenders or pigments; 2) depositing this slurry on a moving papermaking wire or fabric; and 3) forming a sheet from the solid components of the slurry by draining the water. [0004] The foregoing is followed by press...

Claims

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Application Information

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IPC IPC(8): D21H21/10D21H17/55
CPCD21H17/375D21H21/10D21H17/42
Inventor DOHERTY, ERIN A. S.GELMAN, ROBERT A.
Owner HERCULES INC
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