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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.:

US 5272248 B1

PDFFull Text
Date of Patent:
Dec. 21, 1993

Filed:

May. 22, 1992

Polyimide processing additives

Applicant:
Inventors:

J Richard Pratt, Poquoson, VA (US);

Terry L St Clair, Poquoson, VA (US);

Diane M Stoakley, Poquoson, VA (US);

Harold D Burks, Newport News, VA (US);

Assignee:

The United States of America as Represented by the United States, , US;

Attorney:

Helfrich; George F.

Primary Examiner:

John Kight, III

Assistant Examiner:

P Hampton-Hightower

Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528353 ; 528170 ; 528171 ; 528173 ; 528174 ; 528176 ; 528179 ; 528185 ; 528188 ; 528220 ; 528229 ; 528352 ;
Abstract

A process for preparing polyamides having enhanced melt flow properties is described. The process consists of heating a mixture of a high molecular weight poly(amic acid) or polyimide with a low molecular weight amic acid or imide additive in the range of 0.05 to 15% by weight of additive. The polyimide powders so obtained show improved processability, as evidenced by lower melt viscosity by capillary rheometry. Likewise, films prepared from mixtures of polymers with additives show improved processability with earlier onset of stretching by TMA.

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Pratt, J. (1993). Polyimide processing additives (U.S. Patent No. 5272248). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5272248

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