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:
Sep. 20, 1994
Filed:
Apr. 23, 1993
Applicant:
Inventor:
Daniel M Scheck, Midland, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568721 ; 528129 ; 568722 ; 568731 ; 568732 ; 568744 ;
Abstract
A novolac resin is prepared by reacting a phenolic compound, an aldehyde or a ketone, and a hydroxyl-substituted benzocyclobutene compound wherein the hydroxyl group is attached to an aromatic ring. The benzocyclobutenes are connected to the phenolic rings through an oxygen or oxyaryl bridge, or the cyclobutene is fused directly to a phenol ring. The novolac resin cures without evolution of volatiles and, when cured, provides a polymer which has a high glass transition temperature and which is essentially insoluble in organic solvents.