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Process of making aqueous dispersions of polymers, emulsions polymers and use thereof

An emulsion polymerization and polymer technology, applied in the field of emulsion polymers, can solve the problems of poor coating appearance and so on

Inactive Publication Date: 2009-06-03
RHODIA OPERATIONS SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If there is too much grit, the coating appearance will be poor, so the polymer dispersion may have to be filtered, which is time consuming and expensive

Method used

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  • Process of making aqueous dispersions of polymers, emulsions polymers and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0104] The emulsion polymer (latex) was prepared according to the following polymerization method.

[0105] aggregation method

[0106] All amounts of compounds given in the polymerization formulations are expressed in parts by weight relative to a total of 100 parts of monomer used ("phm", "per hundred monomers") or in grams.

[0107] A mixture of water, seed crystals and surfactant was prepared as shown in Table 1 in a 5 liter polymerization vessel. The seed crystal is polystyrene latex with a particle size of 25-45nm.

[0108] A mixture of water, surfactant, sodium hydroxide and ammonium persulfate was prepared as shown in Table 1 in batch tank "A".

[0109] A mixture of butadiene, styrene, acrylic acid and t-dodecylmercaptan (tDDM) was prepared as shown in Table 1 in batch tank "B".

[0110] Oxygen was removed from the polymerization vessel by at least two cycles of vacuum and nitrogen introduction, then the temperature was raised to 80°C and stirring was continued at...

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Abstract

The present invention relates to a process of making aqueous dispersions of copolymers, for example based on conjugated, aliphatic dienes and vinyl aromatic compounds. It relates also to the emulsions polymers obtained thereby, and to the use thereof as binders for the coating of paper. The invention also related to a coated paper having a coating comprising the emulsion copolymer. The process involves using at least two emulsifiers.

Description

technical field [0001] The present invention relates to a process for the preparation of aqueous polymer dispersions, eg based on copolymers of conjugated aliphatic dienes and vinylaromatics. It also relates to the emulsion polymers thus obtained, and their use as paper coating binders. The invention also relates to coated paper having a coating comprising the emulsion copolymer. The method involves the use of at least two emulsifiers. Background technique [0002] Aqueous polymer dispersions based, for example, on copolymers of conjugated aliphatic dienes and vinylaromatics are known (see eg DE-A 26 02 445, DE-A 26 02 444, US Pat. No. 3,575,913). Aqueous polymer dispersions are generally stabilized with known emulsifiers or protective colloids known to those skilled in the art (Houben-Weyl, Methoden der org. Chemie, Vol. XIV / 1, 1961, Stuttgart). Examples thereof are polyethylene glycol ethers, sulfonated paraffins, higher alkyl sulfates (such as, for example, lauryl sulf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/26C08F36/04C08F12/00D21H19/56C09D125/02C09D147/00
CPCD21H19/58C08F236/10C08F2/26C09D125/14C08F212/08C08F257/02Y10T428/31895C08F236/06C08F220/1804C08F220/06C08F279/02C09D151/04D21H19/56
Inventor F·特雷兹
Owner RHODIA OPERATIONS SAS