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:
Apr. 09, 1991
Filed:
Oct. 11, 1988
Applicant:
Inventors:
Michael J Fazio, Midland, MI (US);
Richard A Wolf, Midland, MI (US);
Edwin J Wilson, Midland, MI (US);
Susan Wollowitz, Walnut Creek, CA (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08J / ;
U.S. Cl.
CPC ...
521 95 ; 521180 ; 521139 ; 521146 ; 521147 ; 521148 ;
Abstract
Hydrazone compounds having two organic moieties joined by a hydrazone group, such as phenylacetone t-butyl hydrazone, are useful blowing agents for foaming polymers, such as bisphenol A/phosgene polycarbonate at temperatures above about 280.degree. C., and particularly at about 300.degree. C. to about 310.degree. C. Polycarbonate polymers formed using the hydrazones as foaming agents show a high impact strength.