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Process for producing dip-formed rubber article

a technology of dip-formed rubber and dip-formed rubber, which is applied in the direction of catalysts, organic chemistry, coatings, etc., can solve the problems of vulcanized rubbers generally having poor vulcanization properties, vulcanized rubbers with poor vulcanization properties, and vulcanization accelerators that are little or no practicality, etc., and achieve excellent surface luster and good vulcanization properties.

Inactive Publication Date: 2001-06-21
ZEON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution prevents the formation of nitrosamines, eliminates cracks, and enhances the surface luster and mechanical strength of vulcanized rubber articles, meeting regulatory standards and providing improved physical properties.

Problems solved by technology

Certain N-nitrosamines (hereinafter abbreviated to "nitrosamines") are carcinogenic, and a problem arises in that it is possible that nitrosamines are produced in vulcanized rubber articles made from a solid polymer rubber or a polymer rubber latex.
Especially a serious problem is caused in medical rubber articles which are used in direct contact with mucous membranes or organs.
At present, the restriction of nitrosamines contained in vulcanized rubber articles by regulation is an urgent problem in Japan and many other countries.
However, it is reported that when this vulcanization accelerator is used for a natural rubber latex, the resulting vulcanized rubbers generally have poor vulcanization properties as compared with vulcanized rubbers made with other conventional vulcanization accelerators (Polymer Digest, 1987, 12, p12-).
This vulcanization accelerator is however little or no practicality because it has a low storage stability and an offensive smell, and results in rubber vulcanizates with poor vulcanization properties.

Method used

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  • Process for producing dip-formed rubber article
  • Process for producing dip-formed rubber article
  • Process for producing dip-formed rubber article

Examples

Experimental program
Comparison scheme
Effect test

examples 6-9

Comparative Example 2

[0061] By the same procedures as employed in Example 1, vulcanized NBR films were made wherein an NBR (copolymer composed of acrylonitrile 37 wt. %, 1,3-butadiene 57.5 wt. % and methacrylic acid 5.5 wt. %, polymerization terminator: hydroxylamine sulfate, molecular weight: 200,000) latex was used instead of the NBR latex used in Example 1 with all other conditions remaining the same. Mechanical properties of the films were measured and the crack occurrence and surface luster thereof were visually examined. The results are shown in Table 3.

3 TABLE 3 Additives*1 Vulcanizing conditions 100.degree. C. .times. 120.degree. C. .times. VA*2 40 min. 40 min. Sulfur Zinc oxide A* B* C* TS*3 El*4 TS*3 El*4 Comp. Exam. 2 2 2 0.5 -- -- 260 500 280 520 Example 6 2 2 --0.5 -- 190 500 200 500 Example 7 2 2 -- 0.5 0.5 250 480 330 500 Example 8 1 3 -- 0.5 0.5 265 450 230 420 Example 9 3 3 -- 0.5 0.5 125 600 165 650 Comp. Exam.: Comparative Example *1: parts / latex[solid] 100 parts ...

examples 10-14

Comparative Examples 3, 4

[0062] In these examples, unsupported globes were made as an example of the dip-formed rubber articles.

Preparation of Vulcanizer Liquid Dispersion

[0063] The following ingredients were pulverized in a ball mill for 48 hours to prepare a liquid vulcanizer dispersion having a solid content of 50 wt. %.

4 Parts by weight Colloidal sulfur (Hosoi Kagaku K.K.) 2.0 #1 Zinc oxide (Seido Kagaku K.K.) 2.0 Vulcanization accelerator A (see Table 1) 0.5 Titanium oxide (JR 600A supplied by TAYCA K.K.) 0.7 Dispersant (Demol N supplied by Kao Corp.) 0.5 KOH 0.01 Water 5.1

Preparation of Dip-Forming Rubber Latex Composition

[0064] The vulcanizer dispersion prepared by the above-mentioned method was added to a NBR latex according to the following recipe, and the mixture was thoroughly stirred to prepare a dip-forming rubber latex composition.

5 Parts by weight NBR latex* 100 Vulcanizer Dispersion 5.71 *Note, latex of copolymer composed of acrylonitrile 27 wt. %, butadiene 67.5 wt....

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Abstract

A vulcanizable dip-forming rubber latex composition comprising an unsaturated nitrile-conjugated diene copolymer rubber latex, a sulfur-containing vulcanizer, and a vulcanization accelerator comprising at least one compound selected from (i) dithiocarbamic acid compounds of the formula: and (ii) zinc dithiocarbamate compounds of the formula: wherein R1 and R2 are hydrocarbon groups having at least 6 carbon atoms which may be the same or different, and an optional thiazole compound. A rubber article dip-formed from the rubber latex composition has no crack occurrence, good surface luster and good vulcanization properties, and does not contain a nitrosamine, and therefore, is suitable for medical use.

Description

[0001] This invention relates to a dip-forming, vulcanizable rubber latex composition comprising a sulfur-containing vulcanizer an a vulcanization accelerator, which is used for making a vulcanized unsaturated nitrile rubber article without production of a nitrosamine which is restricted by regulation, and further relates to a rubber article dip-formed therefrom.[0002] Certain N-nitrosamines (hereinafter abbreviated to "nitrosamines") are carcinogenic, and a problem arises in that it is possible that nitrosamines are produced in vulcanized rubber articles made from a solid polymer rubber or a polymer rubber latex.[0003] For example, as examples of the vulcanized rubber articles made from a polymer rubber latex, there can be mentioned those which are used in contact with the human body, such as a nipple, a balloon, gloves for operation, or medical examination or detection, a balloon sac, and other medical articles. It is possible that nitrosamines are detected in these vulcanized rub...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61L29/04B29C41/14C08K5/39
CPCA61L29/042B29C41/14C08K5/39C08L9/04
Inventor OZAWA, YUTAKAOHTA, HISANORI
Owner ZEON CORP
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