JPH06240225A - Warm-water-washable solid adhesive - Google Patents

Abstract

PURPOSE:To provide a warm-water-washable solid adhesive capable of improving the operation efficiency of cutting, polishing, cutting down, etc., of a glass material, a ceramic material, a magnetic material, rock crystal, a metallic material, an org. material, or the like by bundling and fixing such a material with the adhesive while preventing dust from scattering during such operations, being temporarily fixed on a platen during the operations of cutting, polishing, etc., of the material, and being washed with a perfectly pollution-free detergent after the operations of cutting, polishing, etc., of the material. CONSTITUTION:A warm water-washable solid adhesive comprises as the main component a block polymer having a hydrophilic main chain group of polyethylene glycol obtd. by polymn. of ethylene oxide and two lipophilic terminal groups provided through partial addn. polymn. of propylene oxide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is for cutting, polishing, polishing glass materials, ceramic materials, magnetic materials, quartz crystals, metal materials, organic materials, etc.
The present invention relates to a hot water-washable solid adhesive which is useful for bundling, fixing and fixing to a surface plate when it is subjected to processing such as cutting.

[0002]

2. Description of the Related Art A diamond cutter or a carbon dioxide gas laser method is used for cutting, polishing, cutting or processing a glass material, a ceramic material, a magnetic material, a crystal, a metal material, an organic material or the like.

[0003]

However, when such a glass material or ceramic material is cut with a diamond cutter or the like, scattering of dust is unavoidable.
Further, if these materials can be temporarily fixed to the surface plate during polishing and cutting, it is advantageous in positioning and processing such materials.

When polishing a thin film wafer of semiconductor silicon or the like, the adhesive used to temporarily fix the wafer to a surface plate or the like is used to prevent the wafer from moving during polishing. Some are known up to.

However, all of the adhesives conventionally used for such applications are used in a form in which a thermoplastic resin is dissolved in an organic solvent in order to achieve uniform and uniform application, and the thickness is Was unsuitable for fixing glass etc.

Therefore, an object of the present invention is to condense and fix glass materials, ceramic materials, magnetic materials, crystal, metal materials, organic materials, etc. when cutting, polishing, cutting or the like to improve work efficiency. It is possible to improve and prevent scattering of dust, and when polishing or cutting these materials, it is possible to temporarily fix them to the surface plate,
It is an object of the present invention to provide a hot water washable solid adhesive that can be washed with a completely pollution-free cleaning agent after processing such as polishing.

[0007]

In order to achieve the above object, the hot water-washable solid adhesive of the present invention has a main chain of polyethylene glycol obtained by polymerization of ethylene oxide as a hydrophilic group and propylene oxide at both ends thereof. The main component is a block polymer obtained by partially addition-polymerizing with a lipophilic group.

The above block polymer has a softening point of 50 to 50.
It is a heat fusion crystalline thermoplastic resin having a low softening point of 60 ° C. and having a repeating structure of a single unit. The molecular weight of such a single unit is preferably 6,000 to 30,
000, and the molecular weight of the whole polymer is
It is preferably in the range of 10,000 to 200,000.

The ratio of polypropylene glycol as a lipophilic group to polyethylene glycol as a hydrophilic group is preferably in the range of 50 to 150% by weight. In addition, instead of the addition polymerization of propylene oxide, the same effect as that of the present invention can be obtained by introducing a chain extender having an alkyl group into both ends of polyethylene glycol.

The above block polymer can be produced by a conventionally known method. For example, ethylene glycol is blown into ethylene glycol in the presence of an alkali catalyst under pressure and temperature to perform polymerization to obtain polyethylene glycol, and then, for example, in the presence of a metal alcoholate catalyst, propylene oxide is added to the above polyethylene glycol. The above block polymer can be obtained by polymerizing both ends as a polymerization base. The molecular weight and the rate of partial addition polymerization of propylene oxide can be set within a desired range by controlling the polymerization conditions such as a catalyst and temperature.

The hot-water-washable solid adhesive of the present invention is a modifier capable of forming a film having a sea-island structure, as long as it is compatible with the block polymer or does not completely reduce the fluidity even if it is not completely compatible. Resins can be used.

Examples of the modifying resin which can be used in combination include gelatin, polysaccharide linear polymer, ionomer, vinyl acetate, polyvinyl butyral, p-toluene sulfonic acid type compound, polyurethane, polyester, acrylic compound, caprolactone, Ethylene vinyl acetate resin,
Methyl vinyl maleic anhydride, ethylene maleic acid, an amide compound, etc. can be mentioned.

[0013]

The present inventors have found that the specific modified product of polyethylene glycol partially introduced with a lipophilic group (hydrophobic group) has water resistance at the time of processing such as cutting and polishing of a glass material etc., and continues to fix the glass material etc. However, it was found that it basically takes the form of a composition that dissolves in warm water. That is, even if a polishing liquid such as a glass material (polishing agent dispersion aqueous solution) penetrates from the end surface, it has water resistance due to the action of the lipophilic group during polishing,
It has been found that it is possible to prevent the glass material and the like from falling off the surface plate and making it impossible to polish. Therefore, by using the hot water washable solid adhesive of the present invention, when the glass material or the like is subjected to a processing treatment such as cutting or polishing, the material is bundled and fixed to improve the work efficiency and dust. The splash can be prevented, and the adhesive can be washed off with warm water after processing.

When the ratio of polypropylene glycol as a lipophilic group to polyethylene glycol as a hydrophilic group is less than 50% by weight, the above-mentioned water resistance effect is insufficient, while when it exceeds 150% by weight, an adhesive agent is used. Is difficult to wash off with warm water, which is not preferable.

The hot water washable solid adhesive of the present invention comprises 50 to 50
By using the heat-melting crystalline resin having a low softening point of 60 ° C. as a main component, the thermocompression bonding temperature due to melting can be suppressed low.

Further, since such a solid adhesive for washing with hot water is a crystalline resin, it does not deteriorate the handling property due to stickiness, and can be washed off with warm water, so the washing wastewater is completely pollution-free. That is, the cleaning residue of the adhesive can be incinerated, and the constituent elements are C.I. H. O
Since it is only, no harmful gas is generated and no environmental damage is caused.

[0017]

EXAMPLES Next, the present invention will be specifically described by way of examples. Ethylene glycol 5 parts by weight with ethylene oxide 995
In the presence of an alkali catalyst, parts by weight are blown and polymerized by heating under pressure, and first, polyethylene glycol (M.
W. 12,000) was obtained.

Thereafter, 1,000 parts by weight of propylene oxide was polymerized in the presence of 1,000 parts by weight of the above polyethylene glycol using a metal alcoholate catalyst,
Polypropylene glycol 100% by weight partially added to polyethylene glycol Polymerization molecular weight 24.0
00 crystalline target compound was obtained.

Then, the above-mentioned target compound is added to a size of 10 cm.
A sheet having a square shape and a thickness of 2 mm was formed, and these and five glass plates having the same size were alternately laminated. The laminate was then heated to 100 ° C. to melt the sheets and bond the glass plates together.

When such a laminate was cut with a diamond cutter, almost no dust was scattered. The adhesive strength between the glass plates was 12 kg / cm ² .

After cutting and cutting, an attempt was made to peel the glass plate and dissolve and wash the adhesive by using hot water of 70 ° C. on the above-mentioned laminate. As a result, it was possible to easily peel the glass plate and clean the adhesive. I was able to wash it away.

[0022]

As described above, in the hot water washable solid adhesive of the present invention, glass material, ceramic material, magnetic material, crystal, metal material, organic material, etc. are cut, polished,
When processing such as cutting, they can be bundled and fixed to improve work efficiency and prevent dust from scattering.In addition, when polishing or cutting these materials, use them temporarily on the surface plate. It can be fixed and can be washed with a completely pollution-free cleaning agent after processing such as cutting and polishing.

Claims (3)

[Claims] 1. A hot water washable solid adhesive containing a main chain of polyethylene glycol obtained by polymerization of ethylene oxide as a hydrophilic group, and a block polymer as a main component which is partially addition-polymerized with propylene oxide as a lipophilic group at both ends thereof. . 2. The block polymer has a softening point of 50.
The hot water washable solid adhesive according to claim 1, which is composed of a crystalline thermoplastic resin having a single unit repeating structure in the range of -60 ° C. 3. Gelatin, polysaccharide linear polymer, ionomer, vinyl acetate, polyvinyl butyral, p-toluenesulfonic acid compound, polyurethane, polyester,
The hot water washable solid adhesive according to claim 1, which contains one or more of an acrylic compound, a caprolactone, and a resin of ethylene vinyl acetate.