JP2001262490A - Backing paper for polyvinyl chloride wall paper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a backing paper for polyvinyl chloride wall paper, having high dimensional stability even in heating and moisture absorption and excellent processing suitability of polyvinyl chloride paste. SOLUTION: Both sides of a paper base are coated or impregnated within the range of 2 wt.% to 25 wt.% based on the base paper of a polyethylene glycol.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backing paper for vinyl chloride wallpaper (hereinafter referred to as "vinyl wallpaper"), and particularly has high dimensional stability even during heating and moisture absorption, and has excellent suitability for vinyl paste processing. Related to backing paper for vinyl wallpaper.

[0002]

2. Description of the Related Art Wallpaper backing paper is used as a backing paper for vinyl wallpaper or textile wallpaper. For vinyl wallpaper, apply vinyl paste to the surface of the backing paper,
After gelation, it is commercialized through printing, foaming, embossing and other steps. Vinyl wallpaper is widely used because it is inexpensive compared to woven wallpaper, but in the application of vinyl paste or in the subsequent drying process, wavy deformation (flapping) occurs at the edge of the backing paper, When the flapping becomes severe, there is a problem that a paper break occurs. This is because a change in moisture in the paper causes a dimensional change in the backing paper. In particular, in recent years, due to the speeding up of the vinyl paste processing step, the gelling temperature after the vinyl paste is applied has been further increased, and the dimensional stability of the backing paper for wallpaper has been required more.

Japanese Patent Application Laid-Open No. 8-127999 discloses that 3 to 7% by weight of organic fiber and 0.3% of flame-retardant resin are used per total weight.
A backing paper for vinyl wallpaper having improved dimensional stability by containing 〜6% by weight is described. However, since synthetic fibers other than pulp are mixed and the inorganic pigment is also contained in an amount of 50 to 70% by weight based on the total weight, the formation deteriorates. Also, JP-A-6-280192 discloses that by coating a polyacrylamide having a molecular weight of 50,000 or more and 300,000 or less and further overcoating the coated surface with a water-resistant agent, the workability is improved by improving blocking and improving waist. Is described, but the improvement in dimensional stability upon water absorption is insufficient.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to prevent the backing paper from flapping at the end thereof during the coating of the vinyl paste or in the subsequent drying step.
An object of the present invention is to provide a backing paper for vinyl wallpaper having excellent dimensional stability even when absorbing water.

[0005]

The object of the present invention has been attained by applying or impregnating polyethylene glycol in a range of 2% by weight to 25% by weight with respect to a paper substrate. JP-A-5-295693 describes a surface sizing agent containing polyethylene glycol and a polyvinyl alcohol-based resin as essential components.However, when coating a polyvinyl alcohol-based resin to improve the surface strength of printing paper, Polyethylene glycol is used to suppress scattering of the coating solution and improve high-speed coating suitability.
There is no description suggesting improvement of dimensional stability by polyethylene glycol.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION In the backing paper for vinyl wallpaper of the present invention, the content of polyethylene glycol must be in the range of 2% by weight to 25% by weight based on the paper base material. If the content of polyethylene glycol is less than 2% by weight, the improvement of dimensional stability is insufficient, and 25% by weight.
If it exceeds, the paper strength becomes remarkable.

The molecular weight of the polyethylene glycol used in the present invention is preferably 100 or more and 10,000 or less. Molecular weight 100
If the molecular weight is less than 10,000, the dimensional stability is insufficiently improved, and if the molecular weight exceeds 10,000, the viscosity increases, and it becomes difficult to apply or impregnate the paper base material.

[0008] As a method of applying or impregnating the polyethylene glycol to the paper substrate, a commonly used coating machine such as a size press coater, a gate roll coater, and a curtain coater may be used. Further, a surface treatment agent other than polyethylene glycol may be mixed and applied or impregnated for the purpose of imparting surface strength and size to the extent that dimensional stability is not deteriorated. Examples of the surface treatment agent include polyvinyl alcohol, polyacrylamide, starch, and modified starch.

The paper base material of the backing paper for vinyl wallpaper of the present invention is bleached kraft pulp of softwood (NBKP), bleached kraft pulp of hardwood (LBKP), and groundwood pulp (G).
P), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), deinked pulp (DIP)
Is used alone or mixed at an arbitrary mixing ratio to produce paper.

The paper substrate of the backing paper for vinyl wallpaper of the present invention preferably contains a filler in an amount of 1 to 30% by weight per paper substrate in order to improve opacity. As the filler, calcined clay, kaolin, and illite capable of suppressing the generation of blisters (swelling between the backing paper and the vinyl layer) at the time of applying the vinyl paste are preferable.

In order to impart flame retardancy to the vinyl paper backing paper of the present invention, a flame retardant is applied or impregnated with the above-mentioned polyethylene glycol, or aluminum hydroxide or magnesium hydroxide is blended as a filler. Good. As the flame retardant, guanidine sulfamate,
Guanidine sulfamate methylolate, guanidine phosphate, ammonium sulfamate, ammonium polyphosphate, or the like may be used alone or in combination.

[0012]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. The vinyl paper backing papers produced in the examples and comparative examples were evaluated for dimensional stability and paper strength by the following methods. Evaluation of dimensional stability: JAPAN TAPPI No. 27
According to −78, the elongation of the paper in the transverse direction (papermaking width direction) was measured. When the elongation was 1.5% or less, it was evaluated as ○ (good), and when it exceeded 1.5%, it was evaluated as × (improper). Evaluation of paper strength: According to JIS P8113, the breaking length of the paper in the longitudinal direction (papermaking direction) was measured. .

Example 1 A pulp mixed with 35 parts by weight of NBKP, 61 parts by weight of LBKP and 4 parts by weight of TMP was beaten to a freeness of 500 ml, and a sulfuric acid band was added to the mixed pulp slurry at 0.15% per pulp. Resin wet paper strength enhancer was added to the pulp in an amount of 0.2%, and a mixture of calcined clay and kaolin at a ratio of 50/50 was used as a filler.
And then impregnated with an aqueous solution of polyethylene glycol (molecular weight: 200) with a size press coater so as to be 3% by weight based on the base paper.
to prepare a paper backing of m ^2. The dimensional stability and paper strength of the obtained backing paper were evaluated.

Example 2 A backing paper was prepared in the same manner as in Example 1 except that polyethylene glycol was impregnated with a size press coater so as to be 6% by weight per base paper, and dimensional stability and paper strength were measured. evaluated.

Example 3 A backing paper was prepared in the same manner as in Example 1 except that polyethylene glycol was impregnated with a size press coater so as to be 10% by weight per base paper, and dimensional stability and paper strength were measured. evaluated.

Example 4 A backing paper was prepared in the same manner as in Example 1 except that polyethylene glycol was impregnated with a size press coater so as to be 20% by weight per base paper, and dimensional stability and paper strength were measured. evaluated.

Example 5 A backing paper was prepared in the same manner as in Example 1 except that polyethylene glycol having a molecular weight of 6000 was used, and dimensional stability and paper strength were evaluated.

Example 6 A backing paper was prepared in the same manner as in Example 5, except that polyethylene glycol having a molecular weight of 6000 was impregnated with a size press coater so as to be 6% by weight based on the base paper. The paper strength was evaluated.

Example 7 A backing paper was prepared in the same manner as in Example 5 except that polyethylene glycol having a molecular weight of 6000 was impregnated with a size press coater so as to be 10% by weight based on the base paper. The paper strength was evaluated.

Example 8 A backing paper was prepared in the same manner as in Example 5, except that polyethylene glycol having a molecular weight of 6000 was impregnated with a size press coater so as to be 20% by weight based on the base paper. The paper strength was evaluated.

Example 9 The procedure of Example 1 was repeated except that polyethylene glycol having a molecular weight of 200 was impregnated with a size press coater to 3% by weight per base paper and polyvinyl alcohol to 1% by weight per base paper. Similarly, a backing paper was prepared, and dimensional stability and paper strength were evaluated.

Example 10 The procedure of Example 1 was repeated except that polyethylene glycol having a molecular weight of 6000 was impregnated with a size press coater at 3% by weight per base paper and polyvinyl alcohol at 1% by weight per base paper. Similarly, a backing paper was prepared, and dimensional stability and paper strength were evaluated.

Comparative Example 1 A backing paper was prepared in the same manner as in Example 1 except that only water was impregnated with a size press coater, and dimensional stability and paper strength were evaluated.

Comparative Example 2 A backing paper was prepared in the same manner as in Example 1, except that polyethylene glycol having a molecular weight of 200 was impregnated with a size press coater so as to be 30% by weight based on the base paper. The paper strength was evaluated.

Comparative Example 3 A backing paper was prepared in the same manner as in Example 5 except that polyethylene glycol having a molecular weight of 6000 was impregnated with a size press coater so as to be 30% by weight based on the base paper. The paper strength was evaluated.

[0026]

[Table 1] As shown in Table 1, the dimensional stability of the backing paper can be improved by impregnating with polyethylene glycol. However, when the paper base material is impregnated with 30% by weight of polyethylene glycol, the paper strength becomes remarkable,
Not suitable for backing paper.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsunemi Hosokawa 505-1 Pulp Town, Asahikawa City, Hokkaido Nippon Paper Industries Co., Ltd. Asahikawa Mill (72) Inventor Takashi Inogari 505-1 Pulp Town, Asahikawa City, Hokkaido Nippon Paper Asahikawa Co., Ltd. In-plant F-term (reference) 4F055 AA17 BA02 CA18 EA26 FA29 HA17 HA20 4L055 AG88 BE08 BE10 EA14 EA30 GA23

Claims (2)

[Claims] 1. A backing paper for vinyl wallpaper in which polyethylene glycol is applied or impregnated on both sides in a range of 2% by weight to 25% by weight with respect to a paper base. 2. Polyethylene glycol having a molecular weight of 100
2. The method according to claim 1, wherein the range is not less than 10,000.
Backing paper for vinyl wallpaper as described in.