Core-shell polymeric particles

A technology of polymer particles and polymers, applied in physical therapy, prosthetics, massage auxiliary products, etc., to achieve the effect of saving energy

Active Publication Date: 2010-01-13
ROHM & HAAS CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the previously disclosed full range of core-shell polymers can meet this need

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Example 1 : Example 1 was prepared according to the method of Comparative Example B, except that the composition of ME I consisted of the following: 55.0 grams of DI water, 3.7 grams of SDS, 81.4 grams of STY, 22.0 grams of AN and 6.6 grams of MAA, and the composition of ME II consisted of Composition of the following substances: 220.0 g DI water, 9.9 g SDS, 521.4 g STY, 132.0 g AN, 3.3 g LOFA, and 8.3 g DVB. The solids content of the filtered dispersion was 40.6%. The S / Mil was determined to be 0.70 with 7% collapse.

Embodiment 2

[0068] Example 2 : Example 2 was carried out as in Comparative Example C except that the composition of ME I consisted of: 275.0 grams DI water, 13.6 grams SDS, 600.6 grams STY, 154 grams AN and 3.9 grams LOFA. The solids content of the filtered dispersion was 41.2%. The S / Mil was determined to be 0.87 with 6% collapse.

Embodiment 3

[0070] Example 3 : Example 3 was carried out as in Comparative Example E except that the composition of ME I consisted of: 275.0 grams DI water, 13.6 grams SDS, 600.6 grams STY, 154 grams AN, 9.6 grams DVB and 3.9 grams LOFA. DVB was initially added to the ME I composition, but no DVB was added when the ME I feed was added. The solids content of the filtered dispersion was 41.5%. The S / Mil was determined to be 0.69 with 0% collapse.

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Abstract

The present invention provides a polymeric particle including a core, a first shell, and a second shell is provided: the core including, when dry, at least one void; the first shell polymer having a calculated glass transition temperature('Tg') greater than 50 DEG C and including, as polymerized units, from 15% to 60%, by weight based on the weight of the first shell, monomer selected from the group consisting of acrylonitrile, methacrylonitrile, acrylamide, methacrylamide, and mixtures thereof; and from 0.3% to 10%, by weight based on the weight of the first shell polymer, multiethylenically unsaturated monomer; and the second shell polymer having a Tg of from -60 DEG C to 50 DEG C; wherein the weight ratio of the second shell polymer to the total of all other structures of the polymeric particle is from 0.5:1 to 3:1.The particle provides binding functionality and, when dry, opacity and energy savings. A method for providing a polymeric particle and a method for providing opacity to a dry coating are also provided.

Description

technical field [0001] The present invention relates to core-shell polymer particles suitable for use in aqueous compositions, which polymer particles are capable of exhibiting a binding function and have a useful level of opacity in the dried composition. More specifically, the present invention relates to polymer particles comprising a core, a first shell and a second shell: the core comprising at least one void when dry; the first shell polymer having a glass transition temperature (Tg) greater than 50°C , the first shell polymer comprises as polymerized units 15-60% by weight of monomers based on the weight of the first shell polymer selected from the group consisting of: acrylonitrile, methacrylonitrile, acrylamide, methyl Acrylamide and mixtures thereof, and 0.3-10% by weight of polyethylenically unsaturated monomers based on the weight of the first shell polymer; the Tg of the second shell polymer is -60°C to 50°C; wherein, The weight ratio of the second shell polymer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/22C08F265/08C08F265/10C08F291/00C08J9/00
CPCC08F291/00C08F265/00C08F257/02C08F285/00C08F265/04C08F265/06C08L51/003C08L2666/02A61F6/04A61H19/50A61L27/04A61F2006/048A61H2205/087
Inventor J·K·巴德曼
Owner ROHM & HAAS CO
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