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Synthetic polyisoprene latex condom with reduced nitrosamine content

A technology of polyisoprene and condoms, which can be used in male contraceptives, other household appliances, surgery, etc., and can solve the problem of low modulus

Pending Publication Date: 2022-04-22
THAI NIPPON RUBBER IND PUBLIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These accelerators are not used to prevulcanize polyisoprene particles, and the latex products produced have a very low modulus of only 1.5 MPa at 300% elongation

Method used

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  • Synthetic polyisoprene latex condom with reduced nitrosamine content
  • Synthetic polyisoprene latex condom with reduced nitrosamine content
  • Synthetic polyisoprene latex condom with reduced nitrosamine content

Examples

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Embodiment Construction

[0029] Condoms are made from synthetic polyisoprene rubber with a combination of accelerators that cure at varying gradually increasing temperatures, ensuring that polyisoprene condoms are fully cured without vulcanization due to sulfur at each site Excessive curing of any accelerator cured polyisoprene by depletion of the accelerator.

[0030] Due to the low vulcanization temperature, the formation of nitrosamines is limited. Nitrosamines are produced by the reaction of nitrite with secondary amines and are highly temperature dependent. N-nitrosodiethylamine (NDEA) is the strongest carcinogen among nitrosamines.

[0031] Synthetic polyisoprene condoms were produced as follows: First, 15% Hostapur SAS anionic surfactant was prepared by mixing in deionized water at 50°C. Next, prepare a 10% potassium oleate solution.

[0032] The chemicals used in this method and their functions are detailed below.

[0033] sulfur: vulcanizing agent

[0034] Active Zinc Oxide: Activator

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Abstract

A synthetic polyisoprene latex emulsion having a pre-vulcanized composition and a post-vulcanized composition is disclosed. The pre-sulfurized composition comprises insoluble amorphous sulfur that is extracted with a zinc dithiocarbamate catalyst at 20 DEG C to form sulfur chains and delivered into the synthetic polyisoprene particles to form a physical connection of sulfur to the active sites. The degree of prevulcanization is verified by a swelling index test by expanding the cast and dried latex film in toluene within 20 minutes. The latex emulsion is vulcanized at 90 DEG C to 120 DEG C for 3 to 5 minutes. A post-vulcanized composition with an accelerator is cross-linked between synthetic polyisoprene particles, uniformly cured between and within the particle regions to produce high cross-linking density, uniform distribution of double bonds, and zinc segregation at the original particle boundaries. The condom has high tensile strength, tensile modulus and elongation and excellent tear strength, and released nitrosamine is lower than 10 ppb.

Description

technical field [0001] The present invention relates to the production of highly stretchable synthetic polyisoprene latex condoms and methods having reduced amounts of nitrosamines. Background technique [0002] The present invention relates to the manufacture of dip-molded synthetic polyisoprene condoms comprising dipping the condom moldings into a pre-vulcanized latex emulsion of synthetic polyisoprene at reduced temperatures thereby reducing or eliminating carcinogenic nitrosamines Formation. See: https: / / www.who.int / ipcs / publications / cicad / en / cicad38.pdf. Therefore, latex condoms are produced in an environment free of nitrosamines, usually below 8.6 mg / kg rubber nipples, Sen [Sen ] et al. 1984, Sen NP [Sen NP], Seaman S [Seaman S], Clarkson S [Clarkson S], Garrod F [Garrod F], Lalonde P [Lalonde P] (1984) Infant Volatile N-nitrosamines in rubber teats and teats of feeding bottles. Analyze, generate and migrate. IARC Scientific Publications, 57:51–57 and minimal or un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L9/10C08K5/39C08J3/24B29C41/14
CPCC08K5/39C08J3/24B29C41/14C08K2201/014C08J2309/10C08L9/10A61F6/04C08K5/0025C08K2003/2296C08J5/02A61L31/14A61L31/049C08J3/26B29K2007/00B29K2105/0064B29L2031/7538C08C19/20C08F136/08A61L2420/02C08K3/06C08K5/42
Inventor 帕同朋·楚帕亚克泰拉夫·皮亚尚苏帕拉特·皮亚尚布莱恩·尤一·肯皮穆克普耶瓦特·楚帕亚克瓦拉纽·达拉塔纳罗伊戴夫·纳拉辛汉苏达山·纳拉辛汉
Owner THAI NIPPON RUBBER IND PUBLIC CO LTD
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