Thomas Lovelace

US Patent:

20110094540, Apr 28, 2011

Filed:

Oct 7, 2010

Appl. No.:

12/899761

Inventors:

Peter A. Morken - Wilmington DE, US
Karlheinz Hausmann - Auvernier, CH
Keith Christian Andersen - Hockessin DE, US
Michael Joseph Molitor - Wilmington DE, US
Mark D. Allen - Newark DE, US
Thomas E. Lovelace - Port Deposit MD, US

Assignee:

E. I. DU PONT DE NEMOURS AND COMPANY - Wilmington DE

International Classification:

B08B 9/00
B29C 33/72

US Classification:

134 221, 264 39

Abstract:

A method is provided for cleaning the interior of polymer processing equipment having a resin composition retained therein, wherein a contaminant material is adhered to at least a portion of the interior surface of the polymer processing equipment. The method comprises the steps of: charging the polymer processing equipment having a residual polymer composition retained in the interior thereof with a purging composition comprising 45-94 weight % of starch; 0.05 to 20 weight % of water; and (3) 5 to 45 weight % of polyol plasticizer, wherein the weight percentages of starch, water and polyol plasticizer are based on the total weight of starch, water and polyol plasticizer; operating the polymer processing equipment to i) convey the purging composition through the polymer processing equipment, thereby removing and withdrawing substantially all of the residual polymer composition from the polymer processing equipment and causing a portion of the purging composition to be retained as a residual purging composition within the interior of the polymer processing equipment; and ii) remove at least a portion of the contaminant material that is adhered to an interior surface of the polymer processing equipment; and removing the portion of the purging composition retained as a residual purging composition from within the interior of the polymer processing equipment.

US Patent:

20210024747, Jan 28, 2021

Filed:

Apr 5, 2019

Appl. No.:

17/043010

Inventors:

- Wilmington DE, US
Yanyan Cao - WILMINGTON DE, US
Lynda Kaye Johnson - WILMINGTON DE, US
Jennifer Leigh Thompson - NEWARK DE, US
Kai Qi - WILMINGTON DE, US
Ting Wang - SHANGHAI, CN
Thomas E. Lovelace - PORT DEPOSIT MD, US
Robert Desmond - NEWARK DE, US
Mario A. Martinez Farias - WILMINGTON DE, US

International Classification:

C08L 77/06
B33Y 70/00
B33Y 80/00

Abstract:

Disclosed are additive manufacturing compositions comprising: A) 100 to 30 weight percent of a polyamide composition comprising: a) 95 to 5 weight percent of at least one semi-crystalline copolyamide having a melting point, said semi-crystalline copolyamide comprising: i) 5 to 40 mole percent aromatic repeat units derived from one or more aromatic dicarboxylic acids with 8 to 20 carbon atoms and at least one aliphatic diamine with 4 to 20 carbon atoms; and ii) 60 to 95 mole percent aliphatic repeat units derived from one or more aliphatic dicarboxylic acids with 6 to 20 carbon atoms and one or more aliphatic diamines with 4 to 20 carbon atoms; b) 5 to 95 weight percent of at least one amorphous copolyamide comprising: iii) 60 to 90 mole percent aromatic repeat units derived from isophthalic acid and at least one aliphatic diamine with 4 to 20 carbon atoms; and iv) 10 to 40 mole percent aromatic repeat units derived from terephthalic acid and at least one aliphatic diamine with 4 to 20 carbon atoms; and B) 0 to 70 weight percent of at least one additive. These compositions provide 3D printed articles having improved physical properties.