US 7,148,300 B2 · Fluoroelastomers with improved permeation resistance and method for making the same

Abstract

A compound is prepared, suitable for forming fluoroelastomers, having the unique features of a low glass transition temperature and desirable permeation resistance. The compound generally comprises two primary components. The first component is an amorphous copolymer including interpolymerized units derived from one or more perfluorinated ethers. The second component is a curable component including at least one filler having at least 10 parts per 100 parts of the first component. Upon vulcanization the resulting elastomeric compound has desirable physical characteristics as indicated by the durometer, the retraction at lower temperatures (TR-10) and permeation resistance.

Claims19

Dependent claims

A compound comprising:

(a) an amorphous copolymer including interpolymerized units derived from one or more perfluorinated ethers of the formula:
CF2═CFO—(CF2)m—(O(CF2)p)n—ORf (Formula 1)
wherein Rf is a perfluorinated (C1–C4)alkyl group, m=1–4, n=0–6, and p=1–2, or
CF2═CF(CF2)m—O—Rf (Formula II)
wherein:
m=1–4;
Rf is a perfluorinated aliphatic group optionally eontaining O atoms;
and
(b) a curable component including at least one filler, present in an amount of at least 10 parts per 100 parts of component (a), such that upon vulcanization the resulting compound has a Shore A hardness according to ASTM D2240 of 60 or greater, a TR-10 of −25° C. or less, and a permeation rate of 65 (g-mm/m2-day) or less.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/659,877Filed 11 Sep 2003 · us provisional application

Priority

12 Sep 2002

Published

US 2004/0054055 A118 Mar 2004

Granted

12 Dec 2006

Term ends

Not estimatedThe source records don’t support an estimate.

Classification5 codes

C08F 214/18
Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one…:…
C08F 214/16
Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one…:…
C08K 5/0025
Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59: crosslinking or vulcanising agents; including…
C08F
Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds

Fluoroelastomers with improved permeation resistance and method for making the same

Life of this patent

Fluoroelastomers with improved permeation resistance and method for making the same

Life of this patent

Abstract

Claims19