The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1997
Filed:
May. 24, 1995
Urs Gruber, Arlesheim, CH;
Aloysius H Manser, Allschwil, CH;
Ciba-Geigy Corporation, Tarrytown, NY (US);
Abstract
The invention relates to a substantially solventless curable resin composition, in particular for the fabrication of prepregs, which contains more than 45% by weight of substances which are solid at ambient temperature at least or at lower temperature, and which, in addition to comprising customary modifiers, comprises solid epoxy resins or a mixture of liquid and solid epoxy resins, at least one initiator which is sensitive to UV radiation for the polymerisation of the epoxy resins and has the formula I ##STR1## wherein a and b are each independently of the other 1 or 2, R.sup.1 ist a .pi.-arene, R.sup.2 is a .pi.-arene, an indenyl anion or a cyclopentadienyl anion, [X].sup..crclbar. is an anion [LQ.sub.m ].sup..crclbar. or the anion of a partially fluorinated or perfluorinated aliphatic or aromatic sulfonic acid, L is B, P, As or Sb, Q is F, with the proviso that some of the radicals Q may also be hydroxyl groups, and m is the valency of L increased by one, and at least one further compound which contains one or more than one carboxyl group, which composition, by heating to a temperature in the range from 60.degree. to 140.degree. C., excluding UV light and without the addition of a solvent, is convertible into a liquid state, and, by cooling to a temperature not exceeding ambient temperature and excluding UV light, can be convened from said liquid state into a solid composition which is chemically substantially still unchanged and has a softening point of -3.degree. C. and higher, and which is tack-free or substantially tack-free at ambient temperature. Prepregs can be fabricated from these compositions in simple manner without the use of solvents.