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US 2025/0153155 A1Published application
Expanded ptfe compositions and methods of forming
AssigneeDonaldson Company, Inc.
InventorsShane Lawson, Elena T. Ewaldz, Andrew J. Reuter, Yehya A. Elsayed, Joe A. Jaye, Andrew J. Schmitz, Mikayla A. Yoder
Life of this patent
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Abstract
Tapes, expanded tapes, and methods of making the same. The tapes and expanded tapes include long-strand PTFE fibrils, short-strand PTFE fibrils, and an oriented network. The oriented network includes nodes. The nodes include short-strand PTFE fibrils.
Claims21
A tape comprising:
- a machined matrix having a machined direction, the machined matrix comprising:
- long-strand PTFE fibrils forming an oriented network comprising the long-strand PTFE fibrils, the long-strand PTFE fibrils defining a longitudinal direction;
- and
- nodes distributed among the oriented network, the nodes comprising short-strand PTFE.
1 more element
An expanded tape comprising:
- an expanded matrix having an expanded direction, the expanded matrix comprising:
- long-strand PTFE fibrils forming an oriented network comprising the long-strand PTFE fibrils, the long-strand PTFE fibrils defining a longitudinal direction, the long-strand PTFE fibrils having a mean diameter of 50 nm or less;
- and
- nodes distributed among the oriented network, the nodes comprising short-strand PTFE fibrils.
1 more element
The expanded tape of 4, wherein the longitudinal direction and expanded direction define an angle of 0 degrees to 20 degrees.
A method of making an expanded tape, the method comprising:
- machining a fibrous matrix in a machined direction to form a machined matrix, the fibrous matrix comprising:
- short-strand PTFE fibrils;
- long-strand PTFE fibrils;
- and
- active particles;
- the machined matrix comprising:
- the long-strand PTFE fibrils forming an oriented network comprising the long-strand PTFE fibrils, the long-strand PTFE fibrils defining the longitudinal direction;
- and
- nodes distributed among the oriented network, the nodes comprising the active particles and the short-strand PTFE distributed among the active particles;
- and
- exposing the machined matrix to a temperature of 190 degrees Celsius to 220 degrees Celsius while expanding the machined matrix in an expanded direction to form an expanded matrix.
8 more elements
Dependencies are inferred from the claim text.