Very low-emission, solvent-, plasticizer-, coalescent-, filler- and light filler-free aqueous dispersion parquet adhesive with low density and particularly advantageous mechanical properties
AssigneeStauf Klewbstoffwerk GmbH
InventorFrank Gahlmann
Life of this patent
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Abstract
Disclosed is an aqueous dispersion parquet adhesive based on at least one dissolved polyvinyl alcohol, at least one dispersed, vinyl acetate-containing polymer, and at least one dispersed, acrylate-containing polymer. The dispersion parquet adhesive has low density, excellent processing properties, and advantageous mechanical properties. The dispersion parquet adhesive according to the invention has an exceptionally high weight ratio of polymeric binder to water and a defined weight ratio of dissolved polymeric binder to dispersed polymeric binder. Also disclosed is a method of producing the parquet adhesive.
Claims19
An aqueous dispersion parquet adhesive that is in a ready to use state, and comprising up to 39 wt % of total water content in the dispersion, and the following at least three polymeric binders:
- a) at least 4 wt % by solid content of at least one dissolved polyvinyl alcohol,
- b) at least 20 wt % by solid content of at least one water-insoluble, dispersed, vinyl acetate-containing polymer,
- c) at least 3 wt % by solid content of at least one water-insoluble, dispersed, acrylate-containing polymer, and
- optionally pH adjuster or pH adjusters,
- wherein
- the weight ratio of the sum of all the dissolved and dispersed polymeric binders present in the composition to water is 1.5:1 to 3.0:1, wherein the term “weight ratio” refers to the ratio of dry solid weights, and
- the weight ratio of the sum of all the dispersed polymeric binders present in the composition to the sum of all the dissolved polymeric binders present in the composition is 3:1 to 15:1, wherein the term “weight ratio” refers to the ratio of dry solid weights, and
- at most 2 wt % of volatile organic compounds are contained therein, and
- at most 5 wt % by the fillers' solid content of fillers are contained therein, and
- the pH is neutral or alkaline, and
- the sum of water, fillers, volatile organic compounds, any pH adjuster, and polymeric binders (a) to (c) is less than or equal to 100% by weight.
A method for producing an aqueous dispersion parquet adhesive, comprising:
- in a first step, optionally water and optionally an aqueous solution of at least one dissolved polyvinyl alcohol (a) is mixed with an aqueous dispersion of at least one water-insoluble, dispersed, acrylate-containing polymer (c) and an aqueous dispersion of 0 to 90 wt % of the total weight of at least one water-insoluble, dispersed, vinyl acetate-containing polymer (b) is added until homogenization is achieved, and
- in a second step, the at least one vinyl acetate-containing polymer (b) in the form of at least one water-dispersible dispersion powder is added to the product of the first step, with stirring, until the final concentration of the at least one vinyl acetate-containing polymer (b) is reached, and stirring is continued until homogenization is achieved, and
- optionally, in a subsequent step, adding with stirring one or more agents selected from the group consisting of pH adjusters, dispersing additives, pigments, dyes, and defoamers, and
- in a final step, stirring of the mixture is continued until homogenization is achieved, and the pH is checked and adjusted if necessary.
Dependencies are inferred from the claim text.