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Process for preparing vinyl acetate-ethylene copolymers by means of emulsion polymerization

A technology of vinyl acetate and ethylene copolymers, applied in the direction of monocarboxylate copolymer adhesives, adhesive types, etc.

Inactive Publication Date: 2013-06-05
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, nonionic emulsifiers are often used, more specifically alkylphenol ethoxylates, however according to GB-A1546275 the use of anionic emulsifiers is disadvantageous

Method used

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  • Process for preparing vinyl acetate-ethylene copolymers by means of emulsion polymerization
  • Process for preparing vinyl acetate-ethylene copolymers by means of emulsion polymerization
  • Process for preparing vinyl acetate-ethylene copolymers by means of emulsion polymerization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2～11

[0297] These examples demonstrate that adhesive properties can be achieved through the use of the emulsifier of the present invention and the simultaneous presence of alkanols of the present invention, and especially an achievable and adjustable performance level with high adhesion and high adhesion. Examples 2 and 3 of the present invention are based on Comparative Example C5, which are implemented without using emulsifiers and alkanols. Examples 4, 5, 7, 9, 10 and 11 of the present invention are based on Comparative Example C4, which are implemented without using emulsifiers and alkanols. Example 6 of the present invention is based on Comparative Example C6, which is implemented without using an emulsifier and alkanol, and Example 8 of the present invention is based on Comparative Example C3, which is implemented without using an emulsifier and alkanol. For all the examples of the present invention, from Table 4 compared with the related comparative examples, it is obvious th...

Embodiment 12～18

[0300] These examples are all based on Comparative Example C4, for which neither emulsifier nor the amount of alkanol according to the invention is used. Examples 12, 13, 14, 17, 18 and 20 of the present invention also used different amounts of the alkanol of the present invention in the absence of an emulsifier, and were prepared only through the introduction of metering feed 4. These examples demonstrate that even only in the case of the present invention using solvents, especially alkanols, without the presence of emulsifiers, sufficient adhesion values ​​can still be achieved, and if for small amounts of solvents used, the solvents are first and initially introduced— -Just like Examples 15 and 16 of the present invention-to the initial reactor charge, the adhesive properties are further improved.

Embodiment 19

[0302] Example 19 of the present invention is also based on Comparative Example C4. This confirms that due to the use of the solvents of the present invention, especially alkanols, in the presence of non-ionic emulsifiers, the adhesion value is significantly improved.

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Abstract

The invention provides processes for preparing vinyl acetate-ethylene copolymers by means of free-radical initiated emulsion polymerization of vinyl acetate, ethylene and optionally one or more further comonomers in the presence of at least one protective colloid and optionally at least one emulsifier, characterized in that the vinyl acetate-ethylene copolymers contain 18 to 45% by weight of ethylene units, based on the total weight of the vinyl acetate-ethylene copolymers, and at least 70% by weight of ethylene units, based on the total weight of the ethylene units and of the further comonomer units of the vinyl acetate-ethylene copolymers, and the free-radical initiated emulsion polymerization is performed in the presence of A) 0.5 to 20% by weight, based on the total weight of the monomers used overall, of one or more solvents, or B) 0.1 to 20% by weight, based on the total weight of monomers used overall, of one or more solvents, and 0.5 to 4% by weight, based on the total weight of monomers used overall, of one or more anionic sulphosuccinic esters of the general formula R1O-CO-CH2-CH (SO3M)-CO-O-R1 (I) in which M is a cation, R1 is a linear or branched alkyl radical having 4 to 17 carbon atoms, an alkylene oxide group -(R2-O)n-X or a cation M, where R2 is a linear or branched alkylene unit having 2 to 5 carbon atoms, n is an integer from 2 to 20 and X is a linear or branched alkyl radical having 4 to 17 carbon atoms, where at most one R1 radical in the general formula (I) is a cation M.

Description

Technical field [0001] The present invention relates to a method for preparing vinyl acetate-ethylene copolymer by emulsion polymerization, the obtained ethyl acetate-ethylene copolymer, and its use in adhesives, more specifically for bonding polymer substrates To the use of cellulosic materials in binders. Background technique [0002] Emulsion polymerization of vinyl acetate and ethylene, optionally with other comonomers, in the aqueous phase has been used for a long time for the purpose of preparing polymer dispersions. In order to obtain colloidal stability in the correspondingly prepared dispersions, water-soluble polymers, such as polyvinyl alcohol, cellulose derivatives, or polyvinylpyrrolidone, for example, are used during emulsion polymerization as so-called protective colloids and / or low Surface active substances with molecular mass are called emulsifiers or surfactants. [0003] For example, in the method described in DE-A1595402, the rate of introduction of ethylene i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C09J131/04
CPCC08F2/26C08F2/06C08F218/08C08F210/02
Inventor 赫尔穆特·泽查格哈德·凯格勒
Owner WACKER CHEM GMBH