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UV curable elastomer composition

Inactive Publication Date: 2010-10-26
THE CHEMOURS CO FC LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such attachment techniques are not completely satisfactory in all cases.
In particular, manual methods are time consuming and adhesives can affect the physical properties of the seal.
Manual fitting of elastomeric seals onto these components is time-consuming, but curing the seal in place is impractical because either the cure temperature or, in some cases, the post cure temperature, is usually high enough to cause deformation of the thermoplastic.
Yet, if the cure temperature is lowered, cure rate is too slow to be practical.
Electron beam cures have the disadvantage of requiring quite complex and expensive equipment for generating high energy particles.
However, the disclosed process involves dissolution of the particular polymer in an acrylate monomer and is not suitable for preparation of general rubber goods, such as gaskets and seals.
These prior art compositions possess interesting properties, but they do not provide compositions that exhibit the tensile strength, modulus, and compression set that is required in many commercial applications, for example air intake manifold gaskets.
Extended high temperature exposure of curable compositions containing these polymers can be problematic due to the tendency of these polymers to dehydrochlorinate.
Because of the high cure temperatures required, these elastomers have little utility in applications involving formation of elastomer / thermoplastic composites that are cured in place.
However, chlorinated elastomer compositions that could be readily applied to a groove or an article in their uncured slate and that are adapted to low temperature curing techniques are not known in the prior art.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0115]A curable elastomeric composition of the invention was prepared by mixing on a rubber mill 92.5 parts of a copolymer of ethylene and methyl acrylate (ethylene content 34 wt. %, Mooney viscosity ML1+4 (100° C.) of 8), 7.5 parts trimethylolpropane triacrylate, 0.75 parts Irgacure® 1800 photoinitiator (a mixture of 75 wt. % 1-hydroxycyclohexyl phenyl ketone and 25 wt. % bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylphenylphosphine oxide, available from Ciba-Geigy, Ltd.), and 0.5 parts Naugard® 445 antioxidant (4,4′-di(α, α-dimethyl-benzyl)diphenylamine, available from Uniroyal, Inc.). Uncured slabs of 6 mm thickness were shaped by molding in a mold coated with Teflon® fluoropolymer resin. The slabs were exposed for one and two minutes respectively to UV radiation from a medium pressure mercury lamp which emitted radiation of wavelength approximately 250-400 nm at 80 watts / cm. The distance of the samples from the lamp was 10 cm. The cured samples exhibited the properties shown in Table...

example 2

[0117]A curable elastomeric composition of the invention was prepared by mixing on a rubber mill 92.5 parts of an acrylate rubber (ethyl acrylate homopolymer, Mooney viscosity ML1+4 (100° C.) of 36, available from Nippon Zeon KK), 7.5 parts trimethylolpropane triacrylate, 0.75 parts Irgacure® 1800 photoinitiator (a mixture of 75 wt. % 1-hydroxycyclohexyl phenyl ketone and 25 wt. % bis(2,6-dimethoxybenzoyl)-2,4,4-trimethylphenylphosphine oxide, available from Ciba-Geigy), and 0.5 parts Naugard® 445 antioxidant (4,4′-di(α, α-dimethyl-benzyl)-diphenylamine, available from Uniroyal, Inc.). Uncured slabs of 6 mm thickness were shaped by molding in a mold coated with Teflon® fluoropolymer resin. The slabs were exposed for one and two minutes respectively to UV radiation from a medium pressure mercury lamp which emitted radiation of wavelength approximately 250-400 nm at 80 watts / cm. Cure was effected on samples placed 10 cm from the lamp. The cured samples exhibited the properties shown i...

example 3

[0119]A curable elastomeric composition of the invention was prepared by mixing on a rubber mill 92.5 parts of a copolymer of ethylene and vinyl acetate (ethylene content 32 wt. %, Mooney viscosity ML1+4 (100° C.) of 9), 7.5 parts trimethylolpropane triacrylate, 0.75 parts Irgacure® 1800 photoinitiator (a mixture of 75 wt. % 1-hydroxycyclohexyl phenyl ketone and 25 wt. % bis(2,6-dimethoxy-benzoyl)-2,4,4-trimethylphenylphosphine oxide, available from Ciba-Geigy, Ltd.), and 0.5 parts Naugard® 445 parts antioxidant (4,4′-di(α, α-dimethyl-benzyl)diphenylamine, available from Uniroyal, Inc.). Uncured slabs of 6 mm thickness were shaped by molding in a mold coated with Teflon® fluoropolymer resin. Samples of the rubber sheet were exposed for two minutes respectively to UV radiation from a medium pressure mercury lamp, which emitted radiation of from about 250 nm to 400 nm at 80 watts / cm. The distance of the samples from the lamp during the curing process was 10 cm. The cured samples exhib...

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Abstract

Ethylene copolymer elastomer compositions, acrylate rubber compositions, nitrile rubber compositions, fluoroelastomer compositions, and chlorinated olefin elastomer compositions are provided which are curable by exposure to UV radiation. The compositions are particularly suited for production of elastomeric seals using hot melt equipment and a gasketing in place technique.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a division of application Ser. No. 09 / 842,430 filed Apr. 26, 2001 now U.S. Pat. No. 6,506,460 which is a division of application Ser. No. 09 / 353,982, filed Jul. 15, 1999, now U.S. Pat. No. 6,346,300 issued Feb. 12, 2002, which is a continuation-in-part of application Ser. No. 09 / 234,014, filed Jan. 19, 1999, now abandoned, which claims the benefit of U.S. Provisional Application No. 60 / 072,109 filed Jan. 21, 1998.FIELD OF THE INVENTION[0002]This invention relates to elastomeric compositions that are curable by exposure to ultraviolet (UV) radiation. In addition, this invention relates to a process for curing elastomeric seals rapidly, wherein the seals are formed by applying an uncured polymer composition directly onto a sealing element or a surface to be sealed. This invention further relates to cured articles produced by the process of the invention.BACKGROUND OF THE INVENTION[0003]Elastomeric compositions require a vulcanizatio...

Claims

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Application Information

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IPC IPC(8): C08F2/50C08F2/46C08F255/02C08F255/04C08F265/04C08F279/02C08L33/08C09K3/10
CPCC08F255/02C08F259/08C08F263/04C08F265/04C08F265/06C08F279/02C08F291/02C08L33/08C09K3/10C09K2003/1068C09K2200/0612C09K2200/062C09K2200/0625C08F255/026C08F222/10C08F2/02C08L2666/28C08F222/103
Inventor PAGLIA, PATRICK LUIGIRUEPPING, CHRISTIAN
Owner THE CHEMOURS CO FC LLC
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