JP3077507B2 - Foam wallpaper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foamed wallpaper used as a building material, in particular, as an interior material, and which passes a quasi noncombustible (grade 2) and nonflammable (grade 1) as a fire wall material.

[0002]

2. Description of the Related Art Soft polyvinyl chloride is mainly used as wallpaper used as an interior material, but hydrogen chloride gas generated at the time of combustion causes a decrease in safety and the life of an incinerator during incineration. Emphasis has been placed on environmental issues.

In order to improve these drawbacks, use of an acrylic or ethylene vinyl alcohol-based aqueous emulsion is conceivable. However, the design and workability are remarkably inferior to those of flexible polyvinyl chloride. Is not desirable.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a rubber having elasticity, voluminousness and surface strength to improve the design. Another object of the present invention is to provide a foamed wallpaper having excellent workability.

[0005]

In order to solve this problem, the present invention provides a coating layer comprising an aqueous emulsion resin, a foaming agent and other additives on a substrate, foams it, and optionally embosses or prints it. In the foam wallpaper made of
At least one monomer unit 50 selected from the group consisting of alkyl acrylates having 1 to 8 carbon atoms in the alkyl group;
A resin comprising 1 to 49% by weight of a monoethylenic monomer unit copolymerizable therewith and 1 to 20% by weight of a polyfunctional grafting agent and / or a polyfunctional crosslinking agent unit as an inner layer; At least one monomer unit selected from the group consisting of alkyl methacrylates having 1 to 4 carbon atoms in an amount of 10 to 99% by weight, and a monoethylenic monomer unit copolymerizable therewith in an amount of 1 to 90% by weight; Functional grafting agent and / or
Alternatively, a resin comprising 3% by weight or less of a polyfunctional crosslinking agent unit is used as an outer layer , an inner layer is 50% by weight or more, and a glass transition temperature is 20 ° C.
A foamed wallpaper characterized by using the following aqueous emulsion is provided.

The inner layer of the aqueous emulsion according to the present invention is a soft resin layer containing alkyl acrylate as a main component,
As the alkyl acrylate, the alkyl group has 1 carbon atom.
Of these, n-butyl acrylate is particularly preferred.

As the copolymerizable monoethylenic monomer, an alkyl methacrylate having 1 to 4 carbon atoms is preferable.
Methyl methacrylate is particularly preferred.

As the polyfunctional grafting agent and / or polyfunctional crosslinking agent, allyl methacrylate, allyl acrylate,
1,4-butylene glycol dimethacrylate, ethylene glycol diacrylate, 1,3-butylene glycol diacrylate, divinylbenzene and the like,
In particular, 1,3-butylene glycol diacrylate is preferable, and 1 to 20% by weight is used.

The outer layer of the aqueous emulsion according to the present invention is a hard resin layer containing alkyl methacrylate as a main component. The alkyl methacrylate has 1 to 4 carbon atoms, particularly preferably methyl methacrylate.

The copolymerizable monoethylenic monomer may be selected in consideration of the appearance, touch, glass transition temperature and the like, and is preferably an alkyl acrylate having an alkyl group having 1 to 8 carbon atoms. .

As the polyfunctional grafting agent and / or the polyfunctional crosslinking agent, the same ones as those for the inner layer can be used, and the amount is 3% by weight or less.

As for the whole aqueous emulsion, the inner layer has 5
The glass transition temperature is preferably 0% or more and 20 ° C. or less.

[0013]

According to the present invention, alkyl acrylate, which is the main component of the inner layer, imparts rubber elasticity and, when used in combination with a capsule foaming agent, expresses excellent mechanical embossing suitability and excellent physical properties. The glass transition temperature is controlled by methacrylate, and there is no stickiness and physical properties excellent in surface strength. This has made it possible to obtain a foamed wallpaper that is equal to or more than conventional soft vinyl chloride.

[0014]

Example: Backing paper (special paper manufacturing Co., Ltd.)
Manufactured by "TT-120cw"), and
A resin composed of an aqueous emulsion having the composition shown in (1) above was coated with a comma coater to a thickness of 80 μm and a furnace temperature of 90 to 130 ° C.
After coating with gravure printing on this
Foaming and mechanical embossing were performed at 50 to 170 ° C.

[0015]

[Table 1]

The foamed wallpaper thus obtained is provided on a noncombustible gypsum board base material and subjected to a surface burning test (JIS-A132).
As a result of performing 1), tdθ = 0 and CA = 8.

[0017]

As described above, according to the present invention, it is possible to provide a foamed wallpaper excellent in design and workability by giving rubber elasticity, volume feeling and surface strength.

Claims (1)

(57) [Claims] 1. A foamed wallpaper which is provided with a coating layer comprising an aqueous emulsion resin, a foaming agent and other additives on a base material and is foamed and optionally embossed or printed. At least one monomer unit selected from the group consisting of alkyl acrylates of 8 to 50 to 99% by weight, a monoethylenic monomer unit copolymerizable therewith from 1 to 49% by weight, a polyfunctional grafting agent and / or A resin comprising 1 to 20% by weight of a polyfunctional crosslinking agent unit as an inner layer, and 10 to 99% by weight of at least one monomer unit selected from the group consisting of alkyl methacrylates having 1 to 4 carbon atoms in an alkyl group; copolymerizable monoethylenic monomer units 1-90 wt%, of a polyfunctional grafting agent and / or polyfunctional crosslinking agent units 3 wt% resin consisting of the outer layer and the inner layer 50 The amount% or more, the glass transition temperature of 20
A foamed wallpaper characterized by using an aqueous emulsion having a temperature of not more than ° C.