Patent ID: 11926727
Assignee: HUNTSMAN INTERNATIONAL LLC
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C  H | IPC C  H

Claim 0:
1. A method for insulating electrical or electronic components comprising the steps
(i) applying a heat curable composition that is stable at room temperature to one or more electrical or electronic components; and
(ii) curing the curable composition at a temperature greater than 60° C., wherein the curable composition comprises:
(a) 10-40% by weight, based on the total amount of components (a)+(b)+(c)+(d), of a cationically polymerisable cycloaliphatic epoxy resin,
(b) an initiator for the cationic polymerisation,
(c) a microparticle filler with an average particle size of 5-25 μm comprising at least one of an angular amorphous silica, an angular aluminium oxide or an angular semi-metal nitride, carbide or hydroxide, and
(d) a silica nanoparticle,

to provide a material having a glass transition temperature greater than 180° C., wherein component (b) is a mixture comprising:
(b1) a quaternary ammonium salt with an aromatic heterocyclic cation having one or two nitrogen atoms and a non-nucleophilic anion selected from BF4−, PF6−, SbF6−, SbF5OH−, BXpYq− or CF3(CF2)mSO3−, wherein
p and q are 0, 1, 2, 3 or 4, provided that p+q=4,
X denotes halogen or hydroxyl,
Y represents phenyl or naphthyl which are unsubstituted or substituted by fluoro, trifluoromethyl, trifluoromethoxy, nitro or cyano, and
m is 0 or an integer from 1 to 17; and

(b2) a 1,2-ethanediol substituted by four aromatic radicals.