Celgard Files Patent Infringement Lawsuit

Celgard Files Patent Infringement Lawsuit

CHARLOTTE, N.C., Feb. 25, 2013 (GLOBE NEWSWIRE) -- Celgard, LLC ("Celgard"), a
subsidiary of Polypore International, Inc. (NYSE:PPO), has filed a complaint
in the U.S. District Court of the Western District of North Carolina against
Sumitomo Chemical Company, Limited.

The complaint alleges that Sumitomo Chemical has infringed Celgard's United
States Patent No. 6,432,586 issued for an invention entitled, "Separator for a
High Energy Rechargeable Lithium Battery." The patent in the lawsuit covers
ceramic composite layer lithium-ion battery separators first developed by
Celgard for high-energy rechargeable lithium-ion batteries. This lawsuit has
been filed after a period in which Celgard attempted to resolve its concerns
with Sumitomo Chemical over infringement of Celgard's patent.

"Celgard has a long history of innovation in lithium-ion battery separators
and is a world leader in this technology," said Robert B. Toth, Chairman,
President and Chief Executive Officer of Polypore. "We have a responsibility
to our customers, partners, and shareholders to safeguard the investments we
make in innovation, and therefore will take appropriate steps like this to
prevent the knowing and unfair exploitation of our intellectual property."

Celgard is represented by the law firm Kilpatrick Townsend & Stockton, LLP.

About Polypore International, Inc.

Polypore International, Inc. is a global high technology filtration company
specializing in microporous membranes. Polypore's flat sheet and hollow fiber
membranes are used in specialized applications that require the removal or
separation of various materials from liquids, primarily in the ultrafiltration
and microfiltration markets. Based in Charlotte, NC, Polypore International,
Inc. is a market leader with manufacturing facilities or sales offices in ten
countries serving six continents. See www.polypore.net.

Forward-Looking Statement

This release contains statements that are forward-looking in nature.
Statements that are predictive in nature, that depend upon or refer to future
events or conditions or that include words such as "expects," "anticipates," "
intends," "plans," "believes," "estimates," and similar expressions are
forward-looking statements. These statements involve known and unknown risks,
uncertainties and other factors that may cause our actual results and
performance to be materially different from any future results or performance
expressed or implied by these forward-looking statements. These factors
include the following: the highly competitive nature of the markets in which
we sell our products; the failure to continue to develop innovative products;
the loss of our customers; the vertical integration by our customers of the
production of our products into their own manufacturing process; increases in
prices for raw materials or the loss of key supplier contracts; our
substantial indebtedness; interest rate risk related to our variable rate
indebtedness; our inability to generate cash; restrictions related to the
senior secured credit agreement; employee slowdowns, strikes or similar
actions; product liability claims exposure; risks in connection with our
operations outside the United States, including compliance with applicable
anti-corruption laws; the incurrence of substantial costs to comply with, or
as a result of violations of, or liabilities under, environmental laws; the
failure to protect our intellectual property; loss of senior management; the
incurrence of additional debt, contingent liabilities and expenses in
connection with future acquisitions; the failure to effectively integrate
newly acquired operations; lithium market demand does not materialize as
anticipated; the absence of expected returns from the intangible assets we
have recorded;the adverse impact from legal proceedings on our financial
condition; and natural disasters, epidemics, terrorist acts and other events
beyond our control. Additional information concerning these and other
important factors can be found in Item 1A. "Risk Factors" of our most recent
Annual Report on Form 10-K and subsequent reports filed with the Securities
and Exchange Commission. Such forward-looking statements speak only as of the
date of this press release. Polypore expressly disclaims any obligation to
release publicly any updates or revisions to any forward-looking statements
contained herein to reflect any change in Polypore's expectations with regard
thereto or change in events, conditions or circumstances on which any
statement is based.

CONTACT: Polypore International, Inc.
         Corporate Communications
         Beth Kitteringham
         (704) 587-8596

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