COMPOSITIONS FOR AN INSULATION TAPE
Compositions for fixing a non-conductive material to a reinforcing layer are provided. In one embodiment, the composition being used to fix a non-conductive material on a reinforcing layer including a novolac produced by condensation of a substituted or unsubstituted phenol with an aldehyde in the presence of a catalyst, and optionally other additives.
1 . An article of manufacture, comprising:
a reinforcement layer;
an adhesive composition disposed on the reinforcement layer, the adhesive composition comprising:
a) a novolac produced by condensation of a substituted or unsubstituted phenol with an aldehyde, where the molar mass of the novolac is from 250 to 1000 g/mol;
b) a catalyst selected from the group consisting of boron(III) halides and/or amine complexes thereof, imidazoles, acetylacetonates, tin(IV) chloride, tertiary amines, tetramethylguanidine, and combinations thereof; and
c) optionally other additives; and
a nonconductive material disposed on the reinforcement layer and the adhesive composition.
2 . The article of claim 1 , wherein the composition comprises from 50 to 90% by weight of novolac, from 1 to 30% by weight of catalyst and from 0 to 49% by weight of other additives based on the entirety of all of the components of the composition.
3 . The article of claim 1 , wherein the composition comprises from 5 to 30% by weight of catalyst based on the weight of the novolac.
4 . The article of claim 1 , wherein the novolac has been produced by condensation of phenol and/or cresol with formaldehyde.
5 . The article of claim 1 , wherein the molar mass of the novolac is from 250 to 500 g/mol.
6 . The article of claim 1 , wherein the catalyst comprises an imidazole.
7 . The article of claim 1 , wherein the nonconductive material comprises mica.
8 . The article of claim 1 , wherein the reinforcement layer comprises a woven fabric, a knitted fabric, a nonwoven fabric or foil made of glass, rockwool, polyimide, polyester, or a combination thereof, and combinations thereof.
9 . The article of claim 1 , wherein the article comprises from 5% to 20% by weight of the adhesive.
10 . The article of claim 1 , wherein the article further comprises an electrical conductor.
11 . The article of claim 10 , wherein the article further comprises a resin based on epoxy resin.
12 . The article of claim 10 , wherein the resin based on epoxy resin impregnates the article.
13 . The article of claim 1 , wherein the article comprises a tape.
14 . The article of claim 13 , wherein the article comprises a mica tape.
15 . The article of claim 10 , wherein the electrical conductor comprises a medium-voltage devices, a high-voltage device, or both.
16 . A process comprising:
(I) providing an insulation tape comprising a nonconductive material and a reinforcement layer adhesive-bonded to one another by means of a composition, wherein the composition comprises:
a) a novolac produced by condensation of a substituted or unsubstituted phenol with an aldehyde, where the molar mass of the novolac is from 250 to 1000 g/mol;
b) a catalyst selected from the group consisting of boron(III) halides and/or amine complexes thereof, imidazoles, acetylacetonates, tin(IV) chloride, tertiary amines, tetramethylguanidine, and combinations thereof; and
c) optionally other additives;
(II) winding the insulation tape around an electrical conductor; and
(III) impregnating the insulation tape wound around the conductor with a resin based on epoxy resin.