Celgard
Celgard is a global developer and producer of high-performance microporous membranes used in energy storage and other barrier-type applications.
Last updated October 19, 2026
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Overview
Celgard describes itself as a global leader in the development and production of high-performance microporous membranes. Its products are used in a broad range of energy storage and other barrier-type applications, including lithium-ion batteries, lithium primary and select specialty battery solutions, as well as technical textiles such as waterproof breathable apparel and medical personal protective equipment (PPE). The company states it was established more than 50 years ago and is headquartered in the United States, with manufacturing facilities in the USA and China and sales and technical service staff located throughout North America, Europe, and Asia. Its technology and capabilities include base films (monolayer polypropylene, trilayer PP/PE/PP, co-extruded monolayer or multilayer films) and functional coatings (heat resistant, adhesive, and surfactant coatings). Celgard's site references Asahi Kasei in its navigation and news.
History
Celgard states that it was established more than 50 years ago and is a proven global leader in the development and production of high-performance membrane technology. Its products are used in a broad range of energy storage and other barrier-type applications, including lithium-ion batteries, lithium primary and other specialty battery solutions, technical textiles such as waterproof breathable apparel and medical personal protective equipment (PPE), and other specialty applications. The company is headquartered in the United States, operates manufacturing facilities in the USA and China, and has sales and technical service staff located strategically throughout North America, Europe, and Asia. Its technology and capabilities include base films (monolayer polypropylene, trilayer PP/PE/PP, co-extruded monolayer or multilayer films) and functional coatings (heat resistant coatings, adhesive coatings, surfactant coatings).
Products and positioning
Global leader in the development and production of high-performance microporous membranes and battery separator technology.
Base Films
Monolayer Polypropylene (PP), Trilayer PP/Polyethylene(PE)/PP, Co-extruded Monolayer or Multilayer Films
Functional Coatings
Heat resistant coatings, Adhesive coatings, Surfactant coatings
Controversies
2020
Celgard files trade secrets lawsuit against Senior, Zhang, Sun Town and Global Venture
Celgard filed a lawsuit in the U.S. District Court for the Western District of North Carolina against Senior, Xiaomin (Steven) Zhang, Sun Town and Global Venture, alleging misappropriation of trade secrets, unfair and deceptive business practices, unfair competition and other claims.
2020
Xingyuan Material sues Celgard over alleged patent infringement
Xingyuan Material sued Celgard, LLC and related parties, asking the court to order them to stop the alleged patent infringement, eliminate its effects and compensate for losses.
2019
Shenzhen Senior files unfair-competition lawsuit against Celgard and related parties
Shenzhen Senior Technology Material said it filed an unfair-competition lawsuit against Celgard and two China-based related parties, alleging they sent customers letters that disparaged its business and exaggerated legal risks associated with its products. The Shenzhen Intermediate People's Court accepted the case; the allegations are claims, not a court determination.
Recent events
- Unconfirmed
Reported
Celgard files amended patent and contract lawsuit involving Farasis, Senior, Sun Town and Global Venture[6]
Celgard filed a second amended complaint in the U.S. District Court for the Northern District of California against Senior-California, Farasis, Sun Town and Global Venture, alleging patent infringement, breach of contract and breach of implied covenants of good faith and fair dealing.
- Unconfirmed
Reported
Celgard files trade secrets lawsuit against Senior, Zhang, Sun Town and Global Venture[6]
Celgard filed a lawsuit in the U.S. District Court for the Western District of North Carolina against Senior, Xiaomin (Steven) Zhang, Sun Town and Global Venture, alleging misappropriation of trade secrets, unfair and deceptive business practices, unfair competition and other claims.
Reported
Xingyuan Material sues Celgard over alleged patent infringement[8]
Xingyuan Material sued Celgard, LLC and related parties, asking the court to order them to stop the alleged patent infringement, eliminate its effects and compensate for losses.
Reported
Shenzhen Senior files unfair-competition lawsuit against Celgard and related parties[5]
Shenzhen Senior Technology Material said it filed an unfair-competition lawsuit against Celgard and two China-based related parties, alleging they sent customers letters that disparaged its business and exaggerated legal risks associated with its products. The Shenzhen Intermediate People's Court accepted the case; the allegations are claims, not a court determination.
Reported
Celgard amends patent and trade-secret lawsuit, adding defendants[7]
Celgard filed a first amended complaint in its U.S. patent case, adding Farasis, Sun Town and Global Venture as defendants. The complaint alleges patent infringement and misappropriation and misuse of Celgard’s trade secrets and confidential information; these are allegations, not a stated court determination.
Sources8 sources
- 1Membrane Technology | Membrane Systems World Leader in Battery Separator Technology | Celgardcelgard.com
- 2About Us World Leader in Battery Separator Technology | Celgardcelgard.com
- 3Careers World Leader in Battery Separator Technology | Celgardcelgard.com
- 4Celgardwikidata.org
- 5Shenzhen Senior files unfair-competition lawsuit against Celgard and related partiesfinance.sina.com.cn
- 6Celgard files trade secrets lawsuit against Senior, Zhang, Sun Town and Global Venturefinanznachrichten.de
- 7Celgard files trade secrets lawsuit against Senior, Zhang, Sun Town and Global Ventureprnasia.com
- 8Xingyuan Material sues Celgard over alleged patent infringementfinance.sina.com.cn
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