Electret materials

Details Electret materials Electret materials

2011-05-24

2011-05-24

Mulcahy, Peter D (Department: 1762)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S099000, C524S141000, C524S214000, C307S400000

Reexamination Certificate

active

07947767

ABSTRACT:
Disclosed are electret materials with outstanding thermal and charge stability. The electret materials comprise a melt blend of a thermoplastic polymer and one or more hindered hydroxylamine ester compounds that comprise at least one moiety of the formula Iwhere Ra′ is a monoacyl or diacyl radical; R1-R4are each C1-C6alkyl; andR5and R6are each, independently of one another, hydrogen, C1-C6alkyl or C6-C10aryl; orR5and R6are together oxygen. The melt blends are subjected to an electet treatment, for example a corona treatment. The electret materials are for example nonwoven polyolefin webs and are employed as filter materials, wipes, absorbent materials, filter masks, acoustic materials, printing substrates, measuring devices or contactless switches. The present electret materials may also comprise a further additive selected from the group consisting of the hindered amine light stabilizers, the hydroxyphenylalkylphosphonic esters or monoesters and the aromatic trisamide nucleating agents.

REFERENCES:
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patent: 5556618 (1996-09-01), Ando et al.
patent: 6123752 (2000-09-01), Wu et al.
patent: 6743464 (2004-06-01), Insley et al.
patent: 6969484 (2005-11-01), Horiguchi et al.
patent: 2003/0216494 (2003-11-01), Roth et al.
patent: 2003/0225191 (2003-12-01), Gugumus

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