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Dip forming composition and dip formed article

A dip molding and composition technology, which is applied in the field of dip molding compositions and dip molding products, can solve problems such as low flex fatigue resistance, cracking at finger bifurcations, etc.

Inactive Publication Date: 2006-12-20
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such a rubber glove, although it has wearing comfort and sufficient tensile strength, has a problem of coloration occurring when exposed to high temperature during production, and a problem of low flex fatigue resistance, which leads to problems in 2-3 hours of use causes cracking at the split ends of the fingers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0121] (production example 1: the production of NBR latex)

[0122] Add 28 parts of acrylonitrile, 66 parts of 1,3-butadiene, 6 parts of methacrylic acid, 0.3 parts of tert-dodecyl mercaptan, 132 parts of ion-exchanged water, 3 parts of Sodium dodecylbenzenesulfonate, 0.5 part of sodium salt of β-naphthalenesulfonic acid-formaldehyde condensate, 0.3 part of potassium persulfate and 0.05 part of sodium edetate. Polymerization was started using a polymerization temperature maintained at 37°C.

[0123] At 60% conversion, 0.15 parts of tert-dodecylmercaptan were added and the temperature was raised to 40°C. At 80% conversion, 0.15 parts of tert-dodecylmercaptan was added, the polymerization was continued until reaching 94% conversion, and then the polymerization was terminated by adding 0.1 part of sodium dimethyldithiocarbamate as a terminator.

[0124] After removing unreacted monomers from the prepared copolymer latex, its pH and solid content were adjusted to prepare conjuga...

Embodiment 2

[0125] (Production Example 2: Production of SBR Latex)

[0126] Add 42 parts of styrene, 54 parts of 1,3-butadiene, 4 parts of methacrylic acid, 0.3 parts of tert-dodecyl mercaptan, 132 parts of ion-exchanged water, 3 parts sodium dodecylbenzenesulfonate, 0.5 parts of sodium salt of β-naphthalenesulfonic acid-formaldehyde condensate, 0.3 parts of potassium persulfate and 0.05 parts of sodium edetate. Polymerization was started using a polymerization temperature maintained at 60°C.

[0127] At 60% conversion, 0.15 parts of tert-dodecylmercaptan were added and the temperature was raised to 70°C. At 80% conversion, 0.15 parts of tert-dodecylmercaptan was added, the polymerization was continued until reaching 95% conversion, and then the polymerization was terminated by adding 0.1 part of sodium dimethyldithiocarbamate as a terminator.

[0128] After removing unreacted monomers from the prepared copolymer latex, its pH and solid content were adjusted to prepare a conjugated dien...

Embodiment 3

[0153] A 5% potassium hydroxide aqueous solution was added to the conjugated diene latex A to adjust the pH to 10, and ion-exchanged water was added to adjust the solid content to 30%. Based on 100 parts of the solid content in the latex, 1 part of dibenzoyl peroxide was added to prepare a dip molding composition.

[0154] Using this dip molding composition, rubber gloves were prepared by the same procedure as in Example 1, except that crosslinking was performed at 120° C. for 30 minutes.

[0155] The performance of this glove was evaluated and the results are shown in Table 1.

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Abstract

A dip formed article that has good texture, excelling in not only tensile strength but also flexing fatigue and that itself does not tend to suffer coloration even when the article is worn and operation is continued; and a dip forming composition capable of providing such a dip formed article. There is provided a dip forming composition comprising a conjugated diene rubber latex and an organic peroxide, wherein providing that X refers to the 10 hr half-life temperature ( DEG C) of organic peroxide and Y refers to the octanol-water distribution coefficient of organic peroxide, the organic peroxide satisfies the formulae: 11 >= Y >= 2 (1), and 100 - 2Y >= X >= 70 - 2Y (2). There is further provided a dip formed article obtained from the composition.

Description

technical field [0001] The present invention relates to a dip-forming composition and a dip-forming article. Background technique [0002] Rubber gloves are widely used in household applications, industrial applications such as those in the food industry and electronic equipment manufacturing, and medical applications. The rubber glove is required to have various properties such that it can be stretched by a relatively weak force to move with the fingers so that the hand does not tire when worn for long periods of time (i.e., it is comfortable to wear), and it should not break during operation ( i.e. sufficient tensile strength). [0003] Furthermore, especially with thin rubber gloves, there is sometimes a problem that when continuous operations move the fingers wearing them, cracking occurs at the crotch of the fingers (ie, low flex fatigue resistance). [0004] Generally, as rubber gloves having high tensile strength and excellent oil resistance, those obtained by dip m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L21/02C08K5/14B29C41/14
Inventor 児玉和美荒井健次鬼武智美太田久纪
Owner ZEON CORP