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:
Jan. 12, 1993
Filed:
Jul. 29, 1991
Daniel A Scola, Glastonbury, CT (US);
John H Vontell, Manchester, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
A polyimide resin or composite may be pretreated by heating a reaction mixture that initially includes an aromatic diamine monomer, an end cap monomer, and an aromatic dianhydride monomer to a temperature between about 250.degree. C. and about 300.degree. C. for a period sufficient to completely imidize the reaction mixture to an imide resin without substantial crosslinking. A crosslinked reinforced polyimide composite article may be fabricated by heating a plurality of prepregs to a first temperature between about 250.degree. C. and about 300.degree. C. for a first period sufficient to completely imidize the prepreg without substantial crosslinking. Each prepreg has a plurality of reinforcing fibers and a reaction mixture. The prepregs are stacked in a desired orientation to form a laminated structure before or after heating to the first temperature and further heated at a superatmospheric pressure to a second temperature for a second period to form a crosslinked reinforced polyimide composite article by consolidating the prepregs and crosslinking the imide resin in the prepreg.