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Low voc solvent-borne printing inks

A solvent and dispersant technology for low VOC solvent-based printing inks to address issues such as health effects

Inactive Publication Date: 2014-07-30
BASF CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known that drying inks by solvent evaporation often leads to undesirable environmental and health effects

Method used

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  • Low voc solvent-borne printing inks
  • Low voc solvent-borne printing inks
  • Low voc solvent-borne printing inks

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0059] Example 1 - An ink was prepared by mixing a titanium dioxide dispersion with nitrocellulose, dimer acid derived polyamide or thermoplastic polyurethane and diluting with the appropriate solvent to standard application viscosity (100 cps measured at 25 s from a No. 2 viscosity cup). Titanium dioxide dispersions were prepared using standard nitrocellulose dispersants and various styrene-acrylic dispersants. The ink is then coated onto polyethylene terephthalate, polypropylene, oriented polypropylene or polyethylene film using an automated K-coater equipped with a wire wound rod or anilox proofer, followed by drying in a 50°F drying oven. Dry for 30 to 60 seconds. The physical and optical properties of the inks were then measured, such as tack, water resistance, wrinkle resistance, gloss, color strength and opacity.

[0060] In general, the styrene-acrylic dispersions improved the gloss and color properties of the inks compared to standard inks. Table 1 is a comparison o...

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Abstract

The styrene-acrylic dispersants used in the pigment dispersions were less viscous than benchmark formulations prepared under otherwise identical conditions, such as nitrocellulose, dimer acid-based polyamides, and thermoplastic polyurethanes. Compared to traditional dispersants, the lower viscosity allows: (a) at lower solvent loads; or if solvent loads are to be maintained, (b) higher pigment and solids contents from styrene- Acrylics make dispersions and inks of similar viscosity.

Description

Background technique [0001] Typical inks used in solvent-based printing applications contain high levels of solvent, ie 50% to 70% or more. However, it is well known that drying inks by solvent evaporation often leads to undesirable environmental and health effects. Therefore, reducing solvents in inks or eliminating solvents in inks is an ongoing goal of the ink industry. Contents of the invention [0002] The styrene-acrylic dispersions, methods of making and uses thereof embodied herein provide for the preparation of high solids pigment dispersions which can be used to make low volatile organic component (VOC) solvent-borne printing ink. In general, the amount of solvent used in styrene-acrylic dispersions and inks is greatly reduced compared to the amount of solvent required for a benchmark dispersant, such as nitrocellulose. The aforementioned solvent reduction for styrene-acrylic dispersants can provide significant cost savings and environmental protection without c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D11/03
CPCC08L33/06C09D11/033C09D11/106C08L77/00C08F212/08C08L33/08C08L25/14C08L35/06C09D135/06C08L25/16C08L75/04C09D133/06Y10T428/24802C08L2666/02C08F220/06C08F220/14C08F220/1808C08F220/1804
Inventor 加里·A·迪特尔前·苏提摩太·D·克洛茨
Owner BASF CORP
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