Vulcanization composition for reducing allergenic potential and elastomeric articles formed therewith

Patent metadata

Field	Value
Publication number	US-11780972-B2
Application number	US-202217590558-A
Country	US
Kind code	B2
Filing date	Feb 1, 2022
Priority date	Dec 13, 2017
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

An elastomeric article having a rubber component comprising polyisoprene and an aldehyde aniline condensate, the elastomeric article having less than 1 ppm diisopropyl xanthogen polysulfide residue.

First claim

The invention claimed is:

1. A method for preparing a chlorinated reduced-allergenicity polyisoprene elastomeric article, comprising:
providing a latex dispersion comprising:
a rubber component comprising polyisoprene, and
a vulcanization composition comprising at least one fugitive dihydrocarbyl xanthogen polysulfide accelerator and at least one aldehyde-aniline condensate,

coating a former with the latex dispersion by coagulant dipping to form a first elastomeric layer,
drying and vulcanizing the first elastomeric layer to form a polyisoprene elastomeric article, and
chlorinating the polyisoprene elastomeric article.

2. The method according to claim 1 , wherein the vulcanization composition is free of non-fugitive accelerators.

3. The method according to claim 1 , wherein the vulcanization composition is free of dithiocarbamates, thiurams, thiazoles, guanidines, or thioureas as accelerators.

4. The method according to claim 1 , wherein the vulcanization composition comprises only one fugitive dihydrocarbyl xanthogen polysulfide accelerator and only one aldehyde-aniline condensate, and
wherein the composition is free of additional compounds that function as accelerators for vulcanizing elastomers.

5. The method according to claim 1 , wherein:
the vulcanization composition further comprises a source of sulfur, wherein the source of sulfur comprises elemental sulfur,
the at least one fugitive dihydrocarbyl xanthogen polysulfide accelerator comprises diisopropyl xanthogen polysulfide,
the at least one aldehyde-aniline condensate comprises heptaldehyde-aniline, and
the vulcanization composition further comprises a metal oxide selected from the group consisting of zinc oxide, magnesium oxide, lead oxide, and combinations thereof.

6. The method according to claim 1 , wherein:
the vulcanization composition further comprises a source of sulfur selected from the group consisting of elemental sulfur and sulfur donors that have a low allergenic potential, and combinations thereof, and
the at least one fugitive dihydrocarbyl xanthogen polysulfide accelerator is selected from the group consisting of diisopropyl xanthogen polysulfide (DIXP), diisopropyl xanthogen disulfide, diisopropyl xanthogen trisulfide, diisopropyl xanthogen tetrasulfide, diisopropyl xanthogen pentasulfide, diisoamyl xanthogen trisulfide, diisoamyl xanthogen tetrasulfide, diisoamyl xanthogen pentasulfide, diethyl xanthogen tetrasulfide, dibutyl xanthogen tetrasulfide, dibutyl xanthogen disulfide, and combinations thereof.

7. The method according to claim 1 , wherein the vulcanization composition is free of additional xanthate compounds.

8. The method according to claim 1 , wherein chlorinating the polyisoprene elastomeric article comprises contacting the polyisoprene elastomeric article with an aqueous chlorine solution containing between about 200 and 700 ppm chlorine.

Assignees

• Allegiance Corp

Inventors

• Chen Seong Fong
• Wong Wei Cheong

Classifications

• C08K2201/019

  the composition being defined by the absence of a certain additive · CPC title

• A41D19/0055

  Plastic or rubber gloves · CPC title

• C08L15/02

  Rubber derivatives containing halogen · CPC title

• C08J7/126

  Halogenation · CPC title

• C08K5/18

  with aromatically bound amino groups · CPC title