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Polyvinyl ester-based latex coating compositions

A polyvinyl ester-based, coating composition technology, applied in the carrier field of optical brighteners, can solve problems such as poor rheology and negative effects of paper coating methods, and achieve the effect of improving rheology

Active Publication Date: 2014-06-11
TRINSEO EURO GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The result is that the paper coating composition has poor rheology and has a negative impact on the paper coating process

Method used

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  • Polyvinyl ester-based latex coating compositions
  • Polyvinyl ester-based latex coating compositions
  • Polyvinyl ester-based latex coating compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] 500 g of polyvinyl acetate (PVAc)-latex XZ 92806 (The Dow Chemical Company, Midland, MI) containing 40 wt. Partially hydrolyzed at room temperature. This amount of base corresponds to a 20% degree of hydrolysis of the acetate functional groups in the PVAc particles. figure 1 The pH of the dispersion is shown dropping from about pH 13 to about pH 8.5 after 3 days over time. The resulting PVAc-based latex exhibits good storage stability over at least 12 months.

[0060] The PVAc-based latex was then blended with styrene butadiene binder DL 920 (The Dow Chemical Company, Midland MI) at 12.5%, 25%, 37.5%, and 50% by weight of the total polymer content of the blend. Each of the resulting blends was then used as 10 parts dry polymer in a coating composition containing 100 parts of calcium carbonate sold under the trade designation HYDROCARB 90 (Omya, Inc, Proctor VT) and 1 part as OBA sold under the trade designation TINOPAL ABP-Z (Ciba Specialty Chemicals, Basel Switzerla...

Embodiment 2

[0070] 500 g of polyvinyl acetate-butyl acrylate copolymer XU 31631 (The Dow Chemical Company, Midland MI) containing 50.4 wt. % solids was partially hydrolyzed at room temperature by adding 174.4 g of a 10 wt. % sodium hydroxide solution. This amount of base corresponds to a 20% degree of hydrolysis of the acetate functional groups in the PVAc particles. The pH of the dispersion dropped over time from about pH 13 to about pH 9.5 after 3 days. The resulting PVAc-based latex exhibits good storage stability over at least 2 months.

[0071] The PVAc-based latex was then blended with styrene butadiene binder DL 920 (The Dow Chemical Company, Midland MI) at 12.5%, 25%, 37.5%, and 50% by weight of the total polymer content of the blend. Each of the resulting blends was then used as 10 parts dry polymer in a coating composition containing 100 parts of calcium carbonate sold under the trade designation HYDROCARB 90 (Omya, Inc, Proctor VT) and 1 part as OBA sold under the trade desig...

Embodiment 3

[0078] 1.25 parts of each of the PVAc-based latexes of Example 1 and Example 2 were blended with 8.75 parts of styrene butadiene adhesive DL 920 (The Dow Chemical Company, Midland MI). 10 parts of the latex formulated above were then mixed with 100 parts of clay pigment sold under the trade designation Capim SP (Imerys, France), 1 part of TINOPAL ABP-Z (Ciba Specialty Chemicals, Basel Switzerland), and 0.35 parts under the trade designation DST 3250 ( Thickener blends sold by The Dow Chemical Company, Midland MI).

[0079] The pH of each coating composition was then adjusted to pH 8.5 and to a solid composition of 63% using a 10% by weight NaOH solution. The different coating compositions were then coated on wood-free paper and compared to formulations prepared using 0.25 parts of Mowiol 6-98 and 9.75 parts of styrene butadiene binder DL 920.

[0080] The viscosities of coating compositions containing PVAc-based latexes were then compared to those containing PVOH. Coating co...

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Abstract

Embodiments of the present disclosure include a polyvinyl ester-based latex having polyvinyl ester-based particles with vinyl ester groups that have been partially hydrolyzed to a predetermined degree, and methods of modifying and forming the polyvinyl ester-based latex of the present disclosure. Embodiments of the present disclosure also include coating compositions that include the polyvinyl ester-based latex of the present disclosure and an optical brightening agent (OBA), where the polyvinyl ester-based particles act as a carrier for the OBA in a coating composition for a print media substrate.

Description

technical field [0001] The present invention relates generally to partially hydrolyzed polyvinyl ester-based latices and their use as carriers for optical brighteners in coating compositions. Background technique [0002] Paper coating compositions are used in the papermaking industry to impart various physical properties and a desired appearance to paper. Typically, paper coating compositions consist of aqueous dispersions containing pigments (eg, clay, calcium carbonate, and / or titanium dioxide) and binders, among other components. [0003] The paper coating composition can be applied to a continuous paper web by high speed coating machines such as knife coaters, air knife coaters, rod coaters and roll coaters. It may be advantageous to use faster coaters to increase productivity and to use higher solids coating compositions to reduce drying costs and improve binder distribution. Therefore, the flow properties of paper coating compositions are important with regard to th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F16/06C08F18/02C08K5/00
CPCC08L21/00C08L31/04C08K3/346C08K5/0008C08L2666/04C08L2666/08
Inventor 艾蒂·拉萨鲁斯纳塔莉·A·哈恩-贝伦斯亚历山大·K·希普
Owner TRINSEO EURO GMBH
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