Polymer and use of the polymer as grinding and dispersing resin

Details Polymer and use of the polymer as grinding and dispersing resin Polymer and use of the polymer as grinding and dispersing resin

1995-03-28

1997-11-04

Szekely, Peter A.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

523201, 524458, 524460, 524521, 524522, 524533, 525902, C08F 224, C08L 3102, C08L 3324

Patent

active

056840780

DESCRIPTION:

BRIEF SUMMARY
This application is a 371 of PCT/EP92/02282, Oct, 2, 1992.
The invention relates to a water-dilutable emulsion polymer which is prepared by multistep emulsion polymerization of ethylenically unsaturated monomers in the aqueous phase in the presence of an emulsifier or a plurality of emulsifiers and in the presence of one or more free radical-forming initiators, where the first step of the emulsion polymerization involves polymerization of ethylenically unsaturated monomers containing carboxyl groups and amide groups, and the second step of the emulsion polymerization involves polymerization of ethylenically unsaturated monomers containing no further functional groups in the presence of the emulsion polymer prepared in the first step.
The invention furthermore relates to a process for the preparation of the water-dilutable emulsion polymer, to a coating composition based on the emulsion polymer, and to the use thereof.
Primary dispersions have proven unusable for use as grinding resins in pigment pastes due to the high mechanical load in grinding processes, since the primary dispersions frequently coagulate during grinding. In addition, primary dispersions are generally inferior in pigment wettability to solvent-containing coating compositions based on alkyd resins, acrylate resins and epoxy ester resins, and to known mixtures of water-soluble alkyd resins and secondary dispersions based on polyacrylates.
Emulsion polymers prepared by multistep emulsion polymerization are known. Thus, for example, EP A-332 011 discloses polymers formed by stepwise emulsion polymerization in the presence of conventional water-soluble free radical-forming polymerization initiators and conventional emulsifiers, where the first and second emulsion steps involve polymerization of, inter alia, olefinically unsaturated carboxylic acids. According to EP-A-332 011, the resultant dispersions are employed in wood paints. However, they are unsuitable as grinding resins for pigment pastes, since paints based on the emulsions described generally coagulate immediately after the pigment grinding.
U.S. Pat. No. 4,150,005 relates to two-step emulsion polymers prepared by polymerizing, in a first step, at least 10% by weight, based on the total weight of the monomers in the first step, of hydrophilic monomers, more precisely hydrophilic ionic monomers and non-ionic hydrophilic monomers, such as acrylamides or hydroxyalkyl esters of .alpha.,.beta.-unsaturated acids. In the second step of the emulsion polymerization, monomers containing no further functional groups, such as, for example, methyl methacrylate and styrene, are used. The polymer latices formed can be used as coating compositions, adhesives and binders, for example for coating floors. The emulsions disclosed in U.S. Pat. No. 4,150,005 are suitable for grinding processes, but their pigment wetting capacity is inadequate. This has the consequence that the gloss of the paints prepared from them is in great need of improvement and the coating compositions can only be employed for matt finishes. In addition, the coating compositions disclosed in U.S. Pat. No. 4,150,005 are unsuitable for coating metal substrates, since the adhesion to the substrate is inadequate and the coating compositions are in need of improvement with respect to elasticity.
The object of the invention was to develop aqueous coating compositions which have good pigment wetting capacity and can thus be employed as grinding resins for pigment pastes. In addition, the dispersions should be suitable for grinding processes and should be suitable as binders for physically drying coating compositions. They should be suitable as binders in coating compositions, in particular for metallic substrates, wood and mineral substrates.
The object of the application is achieved by water-dilutable emulsion polymers of the type mentioned at the outset, which are characterized in that ethylenically unsaturated monomers containing carboxyl groups, and olefinically unsaturated carboxamides, weight, of hydrophilic ionic and hydrophilic noni

REFERENCES:
patent: 3389110 (1968-06-01), Taft
patent: 4150005 (1979-04-01), Gehman et al.
patent: 4277384 (1981-07-01), Arkens
patent: 4351875 (1982-09-01), Arkens
patent: 5356956 (1994-10-01), Uemae et al.
patent: 5405879 (1995-04-01), Uemae et al.

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