CS218928B1 - Emulsion Adhesive for Laminating Plastic Films on (Paper - Google Patents

Abstract

Lamination of plastic films, for example onto printed matter in laminating equipment in the printing or paper industry. The invention is an adhesive for laminating plastic films onto paper, which is made up of a mixture of trichloroethylene, acrylate dispersion — i.e. an aqueous dispersion of vinyl acetate acrylate copolymer without plasticizers — ethyl acetate and water.

Description

The present invention relates to a dispersion adhesive for laminating plastic films, for example, for printing in laminating equipment of the printing or paper industry.

The plastic dispersions produced hitherto are used as adhesives either untreated or only with a viscosity adjustment after thickening with a suitable substance. Their disadvantage is mainly their rheological properties, unsuitable viscosity, flow behavior and thixotropy.

A plastic adhesive is known in which the absolute value of flow viscosity and elimination of thixotropy is conditional on the addition of a highly viscous hydrocolloid according to the US Patent No. 176 634. This adhesive is suitable only for gluing paper to paper but not suitable for laminating plastics on printed paper. For this purpose, one- or two-component adhesives which are predominantly diluted with toluene or ethyl acetate are more suitable from a technical point of view. These thinners are both harmful to health, especially in a closed environment of printers, and they also have a negative effect on the printed matter, where they cause color migration into the plastic laminating foil. The service life and quality of the laminated printed matter is thereby impaired. Moreover, the lamination with said adhesives is carried out at a temperature of about 100 ° C, which is energy-intensive, difficult to manufacture and economically demanding.

The above-mentioned disadvantages are eliminated by the adhesive for laminating plastics films to paper according to the invention, which consists of a mixture of up to 4% by weight of trichlorethylene, up to 95% acrylate dispersion, up to 4% ethyl acetate, up to 6% water.

By acrylate dispersion is meant for this purpose an aqueous dispersion of vinyl acetate-acrylate copolymer without plasticizers.

The advantage of the adhesive according to the invention is the easy and quick cold treatment. Water is used as the diluent, and the required viscosity of the adhesive can be varied at will.

This adhesive can be used for all types of lamination and all kinds of plastic films. It can also be used for laminating raster images in the production of plastic photographs.

The content of undesirable substances is minimal here and evaporation of water does not create an undesirable working environment, as is the case with the adhesives used hitherto. Solvent residues in finished products are negligible. Examples of composition:

He did

3,5 kg of trichlorethylene,

90.6 kg acrylic dispersion,

3,5 kg of ethyl acetate,

1 water.

Example 2 kg of trichlorethylene,

90.6 kg acrylic dispersion,

3,5 kg of ethyl acetate,

3.5 liters of water.

Example 3

3,5 kg of trichlorethylene,

90.6 k, g of acrylate dispersion, kg of ethyl acetate,

3.5 liters of water.

Example 4 kg of trichlorethylene, kg of acrylate dispersion, kg of ethyl acetate,

1 water.

The material components are mixed mechanically in any order, at room temperature of 18-25 ° C. The adhesive thus prepared can be used immediately. It is applied to a strip of optical raster, which is pressed in the laminating device onto the continuously fed printed material in the device according to c. Certificate No. 202 800.

Claims (1)

An emulsion adhesive for laminating plastic films to paper, characterized in that it comprises a mixture of 2-4% by weight of triethylene chloride, 80-95% dispersion of vinyl acetate-acrylate copolymer, 2-4% ethyl acetate and 3-6% water.