CS253128B1 - Adhesive composition on base of water dispersions - Google Patents

Abstract

The invention relates to adhesive compositions capable of being used combine a wide range of materials including polyethylene and polypropylene. They consist of 40 to 65% aqueous dispersion of acrylic copolymer by emulsion copolymerization 2-ethylhexyl acrylate, butyl acrylate, ethyl acrylate, acrylic acid, methacrylamide, optionally hydroxyethyl methacrylate. This the copolymer may optionally be modified with dodecyl mercaptan. They can also be used mixtures of the acrylic copolymer dispersion above with an acrylic copolymer dispersion and vinyl monomers, including vinyl acetate, styrene, methyl methacrylate, methacrylamide and glycidyl methacrylate; weight ratio of 1: 2 to 10. Further optionally the composition comprises additives from the group including fillers, modified or unmodified natural and / or synthetic resins, wetting and dispersing additives, defoamers, thickeners, coalescers, antifungal additives, pigments and dyes.

Description

The invention relates to adhesive compositions based on aqueous dispersions or mercaptans of modified acrylic copolymers or mixtures thereof with aqueous dispersions of copolymers of acrylic and vinyl monomers and optionally containing additives.

Hitherto known aqueous dispersion compositions employ acrylic or methacrylic copolymers as binder such as methyl methacrylate, butyl acrylate, 2-ethylhexyl acrylate and acrylic acid in combination with styrene, vinyl acetate, acrylonitrile, etc. Compositions prepared from these dispersions have limited applicability for some applications only , they have low adhesion to plastics, lower heat resistance, they lose their adhesion properties in humid environments, or they are made of harmful monomers, such as acrylonitrile.

The foregoing drawbacks are overcome by the present invention, which are directed to adhesive compositions based on aqueous dispersions or mercaptans of modified acrylic copolymers or mixtures thereof with aqueous dispersions of acrylic / vinyl monomer copolymers and optionally containing additives.

SUMMARY OF THE INVENTION The composition of the present invention consists of a 40 to 65% aqueous dispersion of acrylic copolymers prepared by emulsion copolymerization of 25 to 60 wt. parts by weight of 2-ethylhexyl acrylate, 10 to 60 wt. % of butyl acrylate, 5 to 40 wt. parts by weight of ethyl acrylate, 2 to 7 wt. parts of acrylic acid and 0.5 to 5 wt. 0.5 parts to 8 parts by weight of methacrylamide; parts of hydroxyethyl acrylate and optionally modified from 0.01 to 1 wt. or a mixture of a dispersion of said acrylic copolymer with a dispersion of copolymers of acrylic and vinyl monomers, in particular from the group comprising vinyl acetate, styrene, methyl methacrylate, methacrylamide and glycidyl methacrylate, in a weight ratio of 1: 2 to 10 and optionally up to 400 wt. parts of additives from the group comprising fillers, modified or unmodified natural and / or synthetic resins, wetting and dispersing additives, defoamers, thickeners, coalescents, antifungal additives, pigments and dyes.

An advantage of the adhesive compositions of the present invention is the ability to bond a wide variety of materials, including polyethylene and polypropylene. This ability is due to the low glass transition value of the base copolymers and in addition to the partial crosslinking of the functional groups contained in the system. This partial sieving is both physical in nature for hydroxyethyl methacrylate-free compositions and chemical in nature for hydroxyethyl methacrylate-containing compositions. In this way, heat resistance up to 150 ° C is achieved while maintaining resistance to low minus temperatures. Another important advantage is the elastomeric behavior of the compositions, i.e. under load, plastic flow occurs only at higher application temperatures.

Filled systems are preferably applied as self-adhesive, i.e., those which, upon drying, form a permanently tacky film (particularly suitable for laminating polyethylene and polypropylene).

Filled systems are used for bonding absorbent materials. As fillers it is possible to use chalk, kaolin, feldspar, feldspar, limestone, slate meal, colloidal silica, talc, mineral fibers and the like. Due to the high fillability of the present acrylic copolymers it is possible to prepare flexible cements, e.g. for leveling, jointing and the like. Less filled systems are preferably used for gluing tiles.

The present copolymers are viscosity dependent on the pH change, with increasing pH the viscosity increases. Ammonia, alkali metal hydroxide solutions or, preferably, primary, secondary and tertiary amines such as butylamine, morpholine and aminoalcohols such as monoethanolamine, diethanolamine, triethanolamine and the like can be used to treat it.

Adhesive properties can be adjusted by the addition of unmodified or modified natural and / or synthetic resins such as rosin, modified rosin-based resins, copal resins, shellacs, balsams, phenol-formaldehyde resins, epoxy, epoxyester, polyester, coumarone and coumaroneindene and terpene-terpene resins. The resin products are preferably added in the form of dispersions containing surfactants.

Dispersing and wetting additives such as ethoxyalcohols, ethoxylated alkylphenol, sulfonated alcohols or oils and the like are added to facilitate dispersion of the multiple filled compositions and to stabilize them.

Thickeners such as polyvinyl alcohol, hydroxyethylcellulose, carboxymethylcellulose, starch and the like can be used to thicken the compositions.

Defoamers such as ester alcohols, high molecular weight fatty alcohols, polyglycolamides and the like are added to reduce the foaming of the compositions especially during manufacture.

Antifungal additives such as chlorinated phenols, bis (tributyltin) oxide, triazines and the like are added to ensure resistance to molds.

As coalesters, ethoxyethylene glycol acetate, hexylene glycol, butoxyethylene glycol, 1,4-butanediol and the like can be used.

The compositions are suitable for bonding foil and board materials based on softened polyvinyl chloride, polyethylene, polypropylene, etc., on absorbent and non-absorbent substrates, for bonding floor coverings, ceramic, glass and wood cladding, thermal and acoustic insulation materials, packaging and polygraphy, upholstery and shoemaking, and in combination with hard dispersions for gluing wood, building cladding, etc. Due to the nature of the copolymers, the compositions are useful as sealants or cements. protective coatings with the ability to withstand weather conditions and dilatations.

The invention is further illustrated by the following examples:

He did

The composition suitable for adhesive tapes, for the lamination of polyethylene and polypropylene to paper and cardboard consists of 55% aqueous copolymers prepared by emulsion copolymerization

25 wt. parts 2-ethylhexyl crylate 60 wt. parts butyl acrylate 8 wt. parts ethyl acrylate 2 wt. parts acrylic acid 5 wt. parts methacrylamide and from 2 wt. parts ammonia 0.02 wt. parts polyglycolamine. Ex lad 2

The adhesive composition for bonding floor coverings comprises 50 wt. parts of 40% copolymers prepared by emulsion copolymerization

60 wt. parts Of 2-ethylhexyl acrylate 20 May wt. parts butyl acrylate 12 wt. parts ethyl acrylate 7 wt. parts acrylic acid 1 wt. part methacrylate,

modified

0.02 wt. part dodecylmercaptan and and 23 wt. parts limestone VJM 20 May wt. parts chalk 3 wt. parts morpholine 3.6 wt. parts coumarone resins 0.4 wt. parts bis (tributyltin) oxide

Example 3

Adhesive composition for bonding thermal and acoustic insulation materials in the automotive industry for use in the temperature range of -40 to +150 ° C contains a copolymer prepared by emulsion co-polymerization

40 wt. parts of 2-ethylhexyl acrylate 30 wt. 20 wt. parts of butyl acrylate, parts of ethyl acrylate 5 wt. parts of acrylic acid 2 wt. parts of methacrylamide 3 wt. parts of hydroxyethyl methacrylate 3 wt. 26% ammonia

Example 4

The adhesive composition for gluing wood consists of 10 wt. parts of a 50% aqueous copolymer prepared by emulsion copolymerization

25 wt. parts of 2-ethylhexyl acrylate 40 wt. parts of butyl acrylate 20 wt. parts of ethyl acrylate 6 wt. parts of acrylic acid 4 wt. parts of methacrylamide 5 wt. parts of hydroxyethyl methacrylate and from 75 wt. parts of a copolymer prepared by emulsion copolymerization 50 wt. parts of methyl methacrylate 44 wt. parts of butyl acrylate 4 wt. parts of methacrylamide 2 wt. parts of acrylic acid and from 10 wt. parts of feldspar dust 5 wt. parts of colloidal silica

Example5

The adhesive composition for bonding building claddings consists of 10 wt. parts of a 55% copolymer prepared by emulsion copolymerization

40 wt. parts of 2-ethylhexyl acrylate 22 wt. parts of butyl acrylate 30 wt. 3.5 wt. parts of ethyl acrylate, part of acrylic acid 3 wt. parts of methacrylamide

0.5 wt. % of the modified mass of hydroxyethyl methacrylate; portion of dodecyl mercaptan. and from 30 wt. % of a 50 wt. parts of vinyl acetate 10 wt. parts of butyl acrylate the composition further comprises

49.5 wt. 5 wt. parts of limestone VJM parts of modified rosin 5 wt. parts of colloidal silica 0.5 wt. parts of bis (tributyloin) oxide

Example 6

The adhesive composition having the character of an adhesive sealant useful for jointing consists of 25 wt. parts of a 65% copolymer prepared by emulsion copolymerization

26 wt. parts Of 2-ethylhexyl acrylate 26 wt. parts butyl acrylate 40 wt. parts ethyl acrylate 2 wt. parts acrylic acid 3 wt. parts methacrylamide 3 wt. parts hydroxyethyl methacrylate 75 wt. parts mining 15 Dec wt. parts limestone 3 wt. parts colloidal silica 5 wt. parts dibutyl phthalate 2 wt. parts triethanolamine to lad 7

The adhesive composition suitable as a protective coating for roofs consists of 50 wt. parts of a 60% copolymer

prepared emulsion copolymerization 30 wt. parts of 2-ethylhexyl acrylate 24 wt. . parts of butyl acrylate 40 wt. parts of ethyl acrylate 2 wt. parts of acrylic acid 4 wt. parts of methacrylamide and from 45 wt. feldspar parts 2.5 wt. parts of colloidal silica 2 wt. parts of propylene glycol 0.3 wt. parts of ester alcohol 0.2 wt. parts of ethoxylated alkalphenol.

SUBJECT OF THE INVENTION

Claims (2)

SUBJECT OF THE INVENTION Adhesive composition based on aqueous dispersions or mercaptans of modified acrylic copolymers or mixtures thereof with aqueous dispersions of copolymers of acrylic and vinyl monomers, optionally containing additives, characterized in that it consists of 40 to 65% of an aqueous dispersion of acrylic copolymer prepared by emulsion copolymerization of 25 to 60% by weight parts of 2-ethylhexyl acrylate, 10 to 60 parts by weight of butyl acrylate, 5 to 40 parts by weight of ethyl acrylate, 2 to 7 parts by weight of acrylic acid and 0.5 to 5 parts by weight of methacrylamide, optionally 0.5 to 8 parts by weight of hydroxyethyl methacrylate and optionally modified with 0.01 to 1 part by weight of dodecylmercaptan or a mixture of said acrylic copolymer dispersion with acrylic / vinyl monomer copolymer dispersion especially from the group comprising vinyl acetate, styrene, methyl methacrylate, methacrylamide and glycidyl methacrylate, in a weight ratio of 1: 2 to 10 and optionally up to 400 parts by weight of additives from the group comprising fillers, modified or unmodified natural and / or synthetic resins, wetting and dispersing additives , defoamers, thickeners, coalescents, antifungal additives, pigments and dyes.