Electrically conductive masking tape
Electrically conductive masking tapes include an electrically conductive backing and an electrically conductive pressure sensitive adhesive layer. The pressure sensitive adhesive contains an acrylate-based copolymeric matrix, a crosslinker, an electrically conductive filler, and at least one antioxidant. The acrylate-based copolymeric matrix is the reaction product of a polymerizable mixture including at least one first alkyl(meth)acrylate monomer with a homopolymer Tg of less than −50° C., and at least one hydroxyl-functional alkyl(meth)acrylate with a homopolymer Tg of less than −10° C. The electrically conductive tape is capable of being laminated to and cleanly removed from a substrate surface, after being subjected to harsh conditions such as plasma vapor deposition conditions.
1 . An electrically conductive tape consisting essentially of:
an electrically conductive backing with a first major surface and a second major surface; and
an electrically conductive pressure sensitive adhesive layer with a first major surface and a second major surface, wherein the second major surface of the pressure sensitive adhesive layer is in contact with the first major surface of the electrically conductive backing, wherein the pressure sensitive adhesive consists essentially of:
an acrylate-based copolymeric matrix, the matrix comprising the reaction product of a polymerizable mixture comprising:
85-95% by weight of at least one first (meth)acrylate monomer comprising an alkyl(meth)acrylate with a homopolymer Tg of less than −50° C.; and
5-15% by weight of at least one second (meth)acrylate monomer comprising a hydroxyl-functional alkyl(meth)acrylate with a homopolymer Tg of less than −10° C.;
0.04-0.90% by weight of a crosslinker;
an electrically conductive filler comprising nickel powder, silver powder, or nickel-coated graphite particles; and
at least one antioxidant,
wherein the electrically conductive tape is capable of being laminated to and cleanly removed from a substrate surface, after being subjected to at least one of the conditions comprising:
exposure to a basic cleaning solution at a temperature of from 50-90° C. for at least 30 minutes; and
subject to plasma vapor deposition conditions including exposure to temperatures of up to 200° C. for up to 24 hours.
2 . The electrically conductive tape of claim 1 , wherein the electrically conductive backing comprises copper foil, aluminum foil, or a metallized polymeric film.
3 . The electrically conductive tape of claim 1 , wherein the first monomer comprises butyl acrylate, 2-ethylhexyl acrylate, iso-octyl acrylate, stearyl methacrylate, 2-methoxyethyl acrylate, ethoxyethoxy ethyl acrylate, and combinations thereof.
4 . The electrically conductive tape of claim 1 , wherein the second monomer comprises 2-hydroxybutyl acrylate, or 2-hydroxyethyl acrylate.
5 . The electrically conductive tape of claim 1 , wherein the crosslinker comprises a hydroxyl-reactive crosslinker.
6 . The electrically conductive tape of claim 1 , wherein the electrically conductive filler comprises 5-19% by weight of the total solids content of the pressure sensitive adhesive layer.
7 . The electrically conductive tape of claim 1 , further comprising a release liner in contact with the first major surface of the electrically conductive pressure sensitive adhesive layer.
8 . The electrically conductive tape of claim 1 , wherein the initial 180° Peel Adhesion to a stainless steel substrate is in the range of 0.1-0.3 Newtons/millimeter.
9 . The electrically conductive tape of claim 1 , wherein the aged 180° Peel Adhesion to a stainless steel substrate is in the range of 0.3-0.5 Newtons/millimeter, wherein aging comprises exposure to a basic cleaning solution at a temperature of from 50-90° C. for at least 30 minutes; and exposure to temperatures of up to 200° C. for up to 24 hours.
10 . A method of preparing an article comprising:
providing a substrate with a surface to which plasma vapor deposition is to be carried out;
providing an electrically conductive tape article, wherein the electrically conductive tape article consists essentially of:
an electrically conductive backing with a first major surface and a second major surface; and
an electrically conductive pressure sensitive adhesive layer with a first major surface and a second major surface, wherein the second major surface of the pressure sensitive adhesive layer is in contact with the first major surface of the electrically conductive backing, wherein the pressure sensitive adhesive consists essentially of:
an acrylate-based copolymeric matrix, the matrix comprising the reaction product of a reaction mixture comprising:
85-95% by weight of at least one first (meth)acrylate monomer comprising an alkyl(meth)acrylate with a homopolymer Tg of less than −50° C.; and
5-15% by weight of at least one second (meth)acrylate monomer comprising a hydroxyl-functional alkyl(meth)acrylate with a homopolymer Tg of less than-10° C.;
0.04-0.90% by weight of a crosslinker;
an electrically conductive filler comprising nickel powder, silver powder, or nickel-coated graphite particles; and
at least one antioxidant;
contacting the first major surface of electrically conductive tape article to a portion of the substrate surface to provide a masked surface;
cleaning the masked surface with a basic solution comprising application of a basic cleaning solution with a pH of 13-14 at a temperature of 50-100° for 30-60 minutes;
exposing the masked surface to plasma vapor deposition comprising exposure of the surface to a temperature of 100-200° C. for from 2-24 hours; and
cleanly removing the electrically conductive tape article from the substrate surface.
11 . The method of claim 10 , wherein the electrically conductive backing comprises copper foil, aluminum foil, or a metallized polymeric film.
12 . The method of claim 10 , wherein the first monomer comprises butyl acrylate, 2-ethylhexyl acrylate, iso-octyl acrylate, stearyl methacrylate, 2-methoxyethyl acrylate, ethoxyethoxy ethyl acrylate, and combinations thereof, and the second monomer comprises 2-hydroxybutyl acrylate, or 2-hydroxyethyl acrylate.
13 . The method of claim 10 , wherein the crosslinker comprises a hydroxyl-reactive crosslinker.
14 . The method of claim 10 , wherein the electrically conductive filler comprises 5-19% by weight of the total solids content of the pressure sensitive adhesive layer and comprises nickel powder, silver powder, and nickel-coated graphite particles.
15 . A laminated article comprising:
a three-dimensional substrate with at least a first major surface, a second major surface, and a third major surface that define a volume at least partially comprising substrate material; and
an electrically conductive tape, the electrically conductive tape consists essentially of:
an electrically conductive backing with a first major surface and a second major surface; and
an electrically conductive pressure sensitive adhesive layer with a first major surface and a second major surface, wherein the second major surface of the pressure sensitive adhesive layer is in contact with the first major surface of the electrically conductive backing, wherein the pressure sensitive adhesive consists essentially of:
an acrylate-based copolymeric matrix, the matrix comprising the reaction product of a reaction mixture comprising:
85-95% by weight of at least one first (meth)acrylate monomer comprising an alkyl(meth)acrylate with a homopolymer Tg of less than −50° C.; and
5-15% by weight of at least one second (meth)acrylate monomer comprising a hydroxyl-functional alkyl(meth)acrylate with a homopolymer Tg of less than −10° C.;
0.04-0.90% by weight of a crosslinker;
an electrically conductive filler comprising nickel powder, silver powder, or nickel-coated graphite particles; and
at least one antioxidant; wherein the first major surface of the pressure sensitive adhesive layer is in contact with at least a portion of the first major surface and optionally the second major surface of the substrate to envelope a portion of the volume of the substrate.
16 . The laminated article of claim 15 , wherein first major surface comprises a curved surface.
17 . The laminated article of claim 15 , wherein the electrically conductive tape envelopes at least 5% of the entire three-dimensional volume of the substrate.
18 . The laminated article of claim 15 , wherein the substrate further comprises at least one additional feature, wherein the at least one additional feature is a three-dimensional feature with at least a fourth major and a fifth major surface.