GB2195921A

GB2195921A - Method of manufacturing dust-free gloves

Info

Publication number: GB2195921A
Application number: GB08723561A
Authority: GB
Inventors: Terukazu Fujihana; Koichi Tsubota
Original assignee: SHOWA CHEM
Current assignee: SHOWA CHEM
Priority date: 1986-10-09
Filing date: 1987-10-07
Publication date: 1988-04-20
Anticipated expiration: 2007-10-07
Also published as: JPS6399303A; GB2195921B; GB8723561D0; JPH0327642B2; KR880004768A; KR920006576B1

Abstract

A hand pattern block coated with a gelated vinyl chloride resin is dipped in a mixed emulsion bath and, after being removed from the bath, the pattern block is heated so that the vinyl chloride is melted while the mixed emulsion deposited around the vinyl chloride is simultaneously formed into a coat layer in order to obtain a layer having slip characteristics, the mixed emulsions comprising a synthetic resin emulsion having adhesive properties relative to the vinyl chloride resin and, in mixture therewith, a resin having high hardness, such as methamethyl acrylate, in emulsion state. The film layer formed on the pattern block is reversed and released from the block, a dust-free glove is thus obtained.

Description

SPECIFICATION Method of manufacturing dust-free gloves This invention relates to a method of manufacturing dust-free gloves.

Vinyl chloride-made gloves have hitherto been known for use as household gloves, such as kitchen gloves and washing gloves, and recently it has become known to use gloves of the type as working gloves in precision industry operations.

A vinyl chloride-made glove incorporates a substantial amount of plasticizer in order to provide good flexibility. Therefore, it has high surface stickiness and poor slip quality. In the process if manufacture, such stickiness and poor slip quality are particularly inconvenient because the surface of a glove is likely to stick, portion to portion, when the glove is reversed and released from a hand pattern, glove release operation being thus hampered.

Another difficulty is that such glove is not very convenient for use because it has no good slip on/slip off performance relative to hand. In order to overcome this difficulty, one known approach is to flock piles, or deposit a powdery material, such as calcium carbonate, magnesium carbonate, or mica powder, on the interior of the glove. However, when such glove is used as a working glove in a clean room of an integrated circuit assembly plant or a biotechnology related plant, such flocked fibers or deposited powdery masses are likely to cause dust generation.

As such, for use in clean rooms, supply is required of a working glove which is free of dust generating possibilities and which provides ease of putting on and off.

To this end, it has been known to reasonably reduce the proportion of a plasticizer which would otherwise be a cause of glove stickiness to provide improved slipperiness, and to admix about 50 % of a coarse particle vinyl chloride resin having a particle diameter of about 100 Am with a vinyl chloride paste resin so as to produce a resin film having a thickness of about 100 im, thus incorporating greater slip effect due to the surface irregularity of the coarse particle resin, whereby a dust-free glove having good slip effect is produced.However, such conventional dust-free glove has the following disadvantages: (a) that the use of coarse particle resin in a fairly large proportion results in a reduced film strength; (b) that if the film has a thickness of more than 100 Am, no good slipperiness can be obtained; (c) that since the proportion of the plasticizer is small, the resulting film is rather hard if it is more than 100,um thick, and (d) that sufficient slipperiness cannot be obtained which is required for reversing and releasing the glove from the pattern block, it being thus difficult to carry out release operation in any smooth manner.

Another method of manufacturing a dustfree glove is proposed in Japanese Laid Open Patent Application No.60-119204 (1985). According to the method disclosed in 60119204, a metallic or porcelain hand pattern block is dipped in a vinyl chloride resin sol, and after being removed therefrom, the pattern block is heated so that the vinyl chloride resin sol deposited on the block is gelated.

Then the block is dipped in a synthetic resin emulsion containing 0.1 to 8 % by weight of a uniformly dispersed particulate silica so that the synthetic resin emulsion is deposited around the gelated vinyl chloride resin layer formed on the pattern block. Subsequently, the composite is heated so that the vinyl chloride resin is melted while the synthetic resin emulsion deposited therearound is simuitaneously formed into a layer integral with the vinyl chloride resin layer, the particulate silica contained in the emulsion being thus fixed.

After the composite is cooled, the resulting film is reversed and removed from the pattern block.

In the method disclosed in above cited Japanese Laid Open Patent Application No.60119204, fine particle silica is used, but the silica cannot be dispersed at a primary particle size. In practice, it is dispersed at a secondary particle size of 1 to 5 Am. Therefore, when a very thin synthetic resin layer in which the silica is dispersed is formed on a vinyl chloride resin layer, silica particles are held protuberant on the synthetic resin layer. Therefore, the raised silica portions are likely to be rubbed off in the course of long time use of the glove, thus causing dust generation.

This invention is intended to overcome aforesaid difficulties with the prior art, and has as its primary object the provision of a method of manufacturing gloves which permits easy glove removal from a pattern block and which makes it possible to obtain a glove which is easy to put on and off and free of dust generating possibilities.

In order to accomplish this objective, the method of the invention comprises dipping a metallic or porcelain pattern block in a vinyl chloride resin sol, removing the pattern block therefrom, then heating the block so that the vinyl chloride resin sol deposited on the block is gelated, dipping the composite in a mixed emulsion comprising a synthetic resin emulsion having adhesive properties relative to vinyl chloride- resins and, in mixture therewith, a hard resin, such as methamethyl acrylate, in emulsion state so that a mass of the mixed emulsion is deposited on the outer periphery of the gelated vinyl chloride resin layer formed on the pattern block, removing the composite from the mixed emulsion, then heating same so that the vinyl chloride resin is melted while the mixed emulsion deposited around the vinyl chloride resin is formed into an outer layer integral with the vinyl chloride resin layer and having slip characteristics, cooling the composite, then reversing and releasing the resulting film from the pattern block.

By carrying out these steps, a glove is produced in which a layer having slip characteristics and formed of a mixed emulsion containing a hard resin is positioned on the inner side, so that the glove is easy to put on and off and handy for use and is free of dust generating possibilities. Furthermore, during the stage of glove reversal and release from the pattern block, the slippy layer formed of the mixed emulsion is positioned on the surface side, which fact facilitates glove release operation without the trouble of face to face sticking.

Example: One example of the method of the invention is given to further illustrate the invention.

A metallic or porcelain hand pattern block is first dipped in a vinyl chloride sol comprising a vinyl chloride paste resin admixed with conventional types of plasticizer, stabilizer, and pigment, and with a gelling agent, a diluent, and a filler as required. The pattern block is withdrawn after-a thin layer of the vinyl chloride sol is deposited on the outer surface of the block. The pattern block is heated for one minute while being rotated in a heating oven at about 250"C so that the thin layer on the block is gelated.

Then, the pattern block on which the gelated thin layer is formed is dipped in a mixed emulsion comprising an emulsion of synthetic resins having adhesive characteristics relative to the vinyl chloride resin, such as vinyl chloride, acrylate, and vinyl chloride-acrylate copolymer resin, and in mixture therewith, a hard resin, such as methamethyl acrylate, in emulsion state, so that a deposit of the mixed emulsion is formed over the thin layer of the vinyl chloride resin sol. The hard resin ingredient of the mixed emulsion should be of a particle diameter range of 0.05 ,um to 0.5 jtm.

In order to meet the requirements for slip perinessof the coat layer formed by the mixed emulsion and adhesivity thereof relative to the thin layer of the vinyl chloride resin, the proportions of component resins in the mixed emulsion are set as follows the adhesion purpose resin component (A) (adhesive resin) and the slipperiness purpose resin component (B)(methamethyl acrylate or the like) are in the ratio of (A):(B) = 30 to 60 : 70 to 40, within which range their proportions may be suitably selected. Such material as surface active agent, stickening agent, anti-forming agent, and water may be added to the mixed emulsion as required, and resulting aqueous dispersion is suitably adjusted in concentration and viscosity so as to allow formation of a thin coat layer.More specifically, the concentration of the mixed resin relative to the water is adjusted to about 3 % to 1 5 %, and the viscosity of the dispersion is adjusted to about 150 centipoise.

The pattern block as removed from such mixed emulsion bath has a thin layer of the mixed emulsion deposited on the outer surface thereof. Then, the pattern block is again heated so that the thin layer of the vinyl chloride resin thereon is melted while a thin coat layer of the mixed emulsion is concurrently formed, so that the thin mixed emulsion layer is made integral with the thin layer of the vinyl chloride resin. Thus, a thin film layer of the mixed emulsion having slip characteristics is integrally formed over the thin vinyl chloride layer. Subsequently, the composite is cooled and then a glove comprised of the integrally combined two layers is reversed and released from the pattern block. The process of glove manufacturing has now been completed and aforesaid thin layer having slip characteristics is positioned on the inner side of the glove.

The resin ingredient having high hardness, such as methamethyl acrylate, used in the mixed emulsion should be of a particle diameter range of 0.05 ,um to 0.5 ,um as earlier mentioned, and particles of the resin are dispersed in the mixed emulsion. Therefore, when the mixed emulsion is thinly coated on the thin layer of the vinyl chloride, particles of the resin having high hardness in the thin layer of the mixed emulsion integrally formed with the thin vinyl chloride layer are uniformly dispersed in the so formed thin layer without being allowed to protrude therefrom. Thus, the thin layer formed of the mixed emulsion has reasonable slip characteristics, which provides ease of putting on and off of the glove when in use. Moreover, the fact that particles of the hard resin is uniformly dispersed without being allowed to protrude assures that they are not subject to being rubbed off in the course of prolonged use.

The thin layer formed of the mixed emulsion incorporates for adhesion purpose a synthetic resin emulsion having adhesive characteristics relative to the vinyl chloride resin, and therefore the thin layer itself is free from the possibility of being separated from the thin vinyl chloride resin layer.

The glove thus produced is free from the possibility of surface sticking. This provides ease of release from the pattern block, and when in use it involves no possibility of dust generation and provides ease of slip on and off relative to the operator's hand.

Claims

1. A method of manufacturing a dust-free glove, comprising dipping a metallic or porcelain pattern block in a vinyl chloride resin soi, removing the pattern block therefrom, then heating the block so that the vinyl chloride resin sol deposited on the block is gelated, dipping the composite in a mixed emulsion comprising a synthetic resin emulsion having adhesive properties relative to vinyl chloride resins and, in mixture therewith, a hard resin, such as methamethyl acrylate, in emulsion state so that a mass of the mixed emulsion is deposited on the outer periphery of the gelated vinyl chloride resin layer formed on the pattern block, removing the composite from the mixed emulsion, then heating same so that the vinyl chloride resin is melted while the mixed emulsion deposited around the vinyl chloride resin is formed into an outer layer integral with the vinyl chloride resin layer and having slip characteristics, cooling the composite, then reversing and releasing the resulting film from the pattern block.

2. A dustfree glove produced by the method of claim 1,

3. A method of producing a dust free glove substantially as described herein with reference to the example.