High temperature release films
AssigneeAlliedSignal Inc.
InventorsMingliang Lawrence Tsai, Ferdinand A. DeAntonis, Alfieri Degrassi
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Abstract
Multilayered films produced by coextruding or laminating films comprised of at least one layer of polymethylpentene, at least one layer of a polyamide and an intermediate polymeric adhesive layer. The polyamide layer allows the polymethylpentene layer to be stretched up to 6 times its original length. Such a high orientation ratio for the mulitlayered film increases the mechanical strength and toughness properties of the film. The mulitlayered films are suitable for use as release films for high temperature composite applications such as printed circuit boards.
Claims30
A multilayered film comprising:
- a) a first layer comprised of a polyamide homopolymer or a polyamide containing copolymer;
- b) a second layer comprised of polymethylpentene homopolymer or a polymethylpentene containing copolymer;
- and
- c) an interlayer between a surface of said first layer and said second layer comprised of a polymeric adhesive, which film is independently oriented at least about 2 times in the longitudinal and/or transverse direction.
A method of producing a multilayeredilm comprising:
- a) coextruding
- 1) a first layer comprised of a polyamide homopolymer or a polyamide containing copolymer;
- 2) a second layer comprised of polymethylpentene homopolymer or a polymethylpentene containing copolymer;
- and
- 3) an interlayer between a surface of said first layer and said second layer, said interlayer comprised of a polymeric adhesive to form a multilayered film;
- b) casting said multilayered film;
- and
- c) orienting said mulitlayered film.
A method of producing a multilayeredilm comprising:
- a) laminating
- 1) a first layer comprised of a polyamide homopolymer or a polyamide containing copolymer;
- 2) a second layer comprised of polymethylpentene homopolymer or a polymethylpentene containing copolymer;
- and
- 3) an interlayer between said first and second layers comprised of a polymeric adhesive to form said multilayered film;
- and
- b) orienting said multilayered film.
Dependencies are inferred from the claim text.